Vetronix Tech 1, A, Mastertech MTS 3100 chassis application Manual

General Motors

Chassis Application

1986-2004

Vetronix Corporation

Tech 1

®

, Tech 1A

®

Copyright © 2007

Manual P/N 08002835 Rev. B

, and Mastertech

®

are registered trademarks of Vetronix Corporation

Printed in USA 05/07

This entire document and all information contained herein are proprietary, confidential, and exclusive trade secret property of Vetronix Corporation, and shall not be reproduced, duplicated, or copied in whole or in part, or made available to any person, firm, or corporation without the prior written permission of Vetronix Corporation.

SOME THINGS YOU SHOULD KNOW

WARNING!

Exhaust Gas

When performing any checks with the engine running in an enclosed space such as a garage, be sure there is proper ventilation. Never inhale exhaust gases; they contain carbon monoxide, a colorless, odorless, extremely dangerous gas which can cause unconsciousness or death.

WARNING!

Avoiding Injury

Always set the parking brake securely and block the drive wheels before performing any checks or repairs on the vehicle.

Important—Please Read

The Tech 1, Tech 1A, and MTS 3100 are designed for use by trained service personnel only. They have been developed for the sole purpose of diagnosing and repairing automotive electronic systems. With the help of the tester, the information presented in this manual and the appropriate automotive service manual, qualified personnel should be able to diagnose and repair electronic control systems.

Disclaimer

Every attempt has been made to provide complete and accurate technical information based on factory service information available at the time of publication. However, the right is reserved to make changes at any time without notice.

FCC Compliance

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to

Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

Using This Application with the MTS 3100

The MTS 3100 diagnoses OBD systems in a similar manner as the Tech 1/Tech 1A but with the addition of data display enhancements. All tester adapters required to perform OBD system diagnostics are described in this operator's manual. Be sure to read the vehicle coverage tables for proper adapter configuration before connecting to the vehicle's diagnostic data link connector.

When used alone in the MTS 3100, the operation of the cartridge and the vehicle identification screens, test menus, and data screens are as described in this manual.

When this application is used with the MTS 3100 in conjunction with a program card, vehicle identification screens, test menus, diagnostic trouble codes, and diagnostic data parameters can be viewed in full-screen

Enhanced Mode displays. Refer to the Enhanced Mode operating instructions in the program card operator's manual for further detail.

A Note about Tech 1 and Tech 1A Testers

The Tech 1 was originally introduced as an OEM scan tool in 1984. The Tech 1 Series A (Tech 1A) was released in 1989 and is an updated version of the Tech 1. After 19 years of successful distribution Vetronix decided to retire the Tech 1 and Tech 1 A in 2003. This further established the MTS 3100’s foothold in the automotive service industry.

Please note that while every attempt has been made to ensure the cartridge based software applications work on the Tech 1 and Tech 1A testers, Vetronix strongly recommends that Tech 1 and Tech 1A owners update to the MTS 3100 tester.

Tech 1 and Tech 1A owners now qualify for special discounts on any MTS 3100 tester purchase. Please contact our customer support department for program details: 800-321-4889 Ext 4.

Important—Please Read

When you are using this manual to diagnose a vehicle, take the time to determine the type of tester that you are working with and be sure you are using the correct cables and adapters. Doing so may prevent misuse of application cartridges and incorrect vehicle diagnosis. Refer to Chapter 4 for complete information on the correct cables and adapters to use depending on which tester you have and the vehicle you are diagnosing.

Using This Manual

Reading through this manual before putting your MTS 3100 to work introduces you to all of its capabilities and tell you how to use them immediately. The application software is designed to reduce time-consuming reference to manuals as much as possible. Once you are familiar with the software and its operation, you'll be able to spend more time diagnosing and less time reading. Later, if questions arise, a quick glance at the flow chart for the test you are performing is probably all you need.

The flow charts in this manual consist of screen displays enclosed in boxes. The displays are arranged in the order in which they appear while using the software. Keys on the tester keypad are shown in the manual as white letters in small black boxes. At the end of each test mode description, there is a list of the active tester keys and their functions in that particular test.

Note that if you are using the MTS 3100, the display will look different for vehicle selection and data list software. Otherwise, the diagnostic routines are the same Tech 1/1A displays as those shown in this manual.

Refer to the MTS 3100 Operator’s Manual for examples of MTS 3100 displays.

Most display screens require input from you, such as y, n, and x. To respond when the tester asks for information, just press the appropriate key on the tester keypad. Although there are exceptions, pressing x generally takes you back to the previous screen or to the beginning of a process.

Please read Chapter 2 before beginning diagnostics for the first time.

Manual Title Page 5

Table of Contents

1. GM CHASSIS APPLICATION DESCRIPTION. . . . . . . . . . . . . . . . .

1

OPERATING MODES

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Data List

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DTC(s)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Snapshot

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

OBD Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

GM ABS SYSTEMS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

GM CHASSIS SYSTEMS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Variable Effort Steering Systems

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Traction Control Systems

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electronic Suspension

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tire Inflation Monitoring System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tire Pressure Monitor System

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Vehicle Stability Enhancement System

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1

2

1

1

2

2

2

4

4

4

3

3

3

3

PRECAUTIONS.

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

5

INTRODUCTION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PRECAUTIONS FOR ALL APPLICATIONS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Protect Against Reverse Polarity

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Protect Against Voltage Spikes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Install/Remove Cartridges with Tester OFF

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Apply Parking Brake

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Protect Snapshot Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PRECAUTIONS FOR GM CHASSIS APPLICATION

. . . . . . . . . . . . . . . . . . . . . . . . . .

Lose ABS Braking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Check Tester Induced DTCs

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5

5

6

6

5

6

6

7

7

7

3. VEHICLE COVERAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8

VEHICLE COVERAGE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1986 Vehicle Coverage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .











12

14

17

20

9

10

8

8

23

28

32

37

GM Chassis Application 1986-2004 TOC-i

1997 Vehicle Coverage

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

57

61

65

67

41

45

49

53

4. GETTING STARTED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

71

SETTING UP THE TESTER

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MTS 3100 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tech 1A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tech 1

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

POWERING UP THE TESTER

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SELECTING THE APPLICATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PERFORM VEHICLE AND/OR SYSTEM SELECTION

. . . . . . . . . . . . . . . . . . . . . . . .

Selecting the Model Year

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Selecting the Vehicle Using the VIN

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

75

75

ADAPTER AND ADAPTER CABLE CONFIGURATIONS

. . . . . . . . . . . . . . . . . . . . .

ABS Chassis Adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

GM Electronic Control Units (ECUs)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

16 Pin Data Link Connector (DLC)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Selecting the Correct Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chassis Adapter Usage Table

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

80

81

82

83

83

85

USING THE TESTER KEYPAD AND MENUS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

107

VEHICLE IDENTIFICATION NUMBER (VIN)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

108

77

77

78

72

72

73

74

5. SELECTING AND OPERATING TEST MODES . . . . . . . . . . . . . . .

109

TEST MODES SUMMARY

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

109

SELECTING THE TEST MODES

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

110

Common Test Modes

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

111

MODE F0: DATA LIST

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

111

Create Your Own Data Pairs

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

112

Data List Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

113

MODE F2: DTC(S)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

113

MODE F3: SNAPSHOT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

117

Trigger Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

117

Trigger Condition

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

117

Viewing Captured Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

118

Printing Captured Data

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

119

Selecting Snapshot Mode

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

119

Multiple Data Lists

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

121

Snapshot Set-Up Phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

122

Class 2 Snapshot Data Display Phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

127

GM Chassis Application 1986-2004 TOC-ii

MODE F8: INFORMATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

ADVICS ABS System

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

129

ADVICS - ABS / TCS SYSTEM

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

Mode F0: Data List

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

129

Mode F2: DTCs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

129

Mode F3: Snapshot

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

129

Mode F4: OBD Controls

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

129

Bosch ABS / Suspension / Steering Systems

. . . . . . . . . . . . . . . . . . . . . . . . .

131

VEHICLES WITH BOSCH ABS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

Important Notice for Bosch Systems

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

131

BOSCH 2S MICRO - ABS / ASR SYSTEM

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

132

Mode F1: Code History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

132

Mode F2: Trouble Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

132

Mode F3: ABS Snapshot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

132

Mode F4: ABS/TCS Tests

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

133

Mode F5: TP Sensor Learn

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

142

BOSCH 2S MICRO - SELECT RIDE SYSTEM

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

Mode F0: Flash Codes

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

144

Mode F1: Clear Codes

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

146

BOSCH 2U - ABS / TCS SYSTEM

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

147


147


147


148


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

148

BOSCH 2U - VES SYSTEM

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

Mode F0: Duty Cycle

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

158


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

160

BOSCH 2U - SELECT RIDE SYSTEM

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

162

Mode F1: Clear Codes

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

164

BOSCH 2U - RSS / ELC SYSTEM

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

Mode F0: RSS Calibrate

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

165

Mode F1: ELC Trim Set

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

168

BOSCH 5.0 - ABS / TCS SYSTEM

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

169


169


169


170

Mode F4: Misc. Tests (1995-96 B, E, K-Body)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

170

Mode F4: OBD Controls (1995-96 D-Body; 1996 Y-Body) . . . . . . . . . . . . . . . . . . . . . . . . .

170

Mode F5: TP Sensor Learn

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

179

BOSCH 5.0 - VES SYSTEM

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Mode F0: Duty Cycle Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

181

BOSCH 5.0 - RSS/ELC/SWPS SYSTEM

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

Mode F0: RSS Calibrate

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

183

Mode F1: ELC Trim Set

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

185

GM Chassis Application 1986-2004 TOC-iii

Mode F2: SWPS Adjustment

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

187

BOSCH 8.0 - ABS SYSTEM

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

189

Mode F2: DTCs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

189

Mode F3: Snapshot

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

189


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

189

BOSCH RTD - REAL TIME DAMPING SYSTEM

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

Function F1: RTD Diagnostics

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

194

Function F2: RTD Calibrate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

195

Delco ABS Systems

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

196

DELCO MORAINE ABS III

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

196

Mode F1: DTC History

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

196


199

Mode F3: Snapshot

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

202

Mode F4: ABS Tests

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

202

DELCO ABS VI (UART)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219

Warning Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

219


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

219

Mode F1: DTC History

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

220

Mode F2: DTCs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

223


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

223

Mode F5: Motor Rehome

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

246

Mode F6: Bleed Prep

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

248

DELCO ABS VI (CLASS 2)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

250

Mode F2: DTCs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

250

Mode F3: Snapshot

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

250


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

250

DBC 7

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

257

ABS WARNING LAMP

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257

SMART CLUSTER

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257

LOW TRAC LAMP

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258

TCS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258

ETS WARNING LAMP

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258

SELF TEST

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258

TIRE INFLATION MONITOR (TIM) SYSTEM

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259

MAGNETIC SPEED VARIABLE ASSIST (MSVA)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 260

MODE F4: OBD CONTROLS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260

Submode F0: Solenoid Test

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

260

Submode F2: Automated Bleed

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

262

Submode F3: Automated Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

264

Submode F4: Relay Test

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

264

MODE F8: INFORMATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264

Delco/Bosch 5.0

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

265

GM Chassis Application 1986-2004 TOC-iv

ABS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265

Traction Control

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

265

Stabilitrak Operation (ICCS2 and ICCS3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

265

MODE F0: DATA LIST

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266

MODE F2: DTCS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266

MODE F3: SNAPSHOT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266

MODE F4: OBD CONTROLS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267

Submode F0: Solenoid Test

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

267

Submode: Automated Bleed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

269

Submode F2: Automated Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

271

Submode F3: TCS Test

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

273

Submode: Lamp Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

274

Submode F6: Magna Steer Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

275

GM Medium Duty 4WAL ABS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

276

KELSEY-HAYES 4WAL 4 SENSOR

(HYDRAULIC ANTILOCK BRAKE SYSTEM)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276

Self Tests

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

276


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

276

KELSEY-HAYES 4WAL 4 SENSOR

(ELECTRIC/HYDRAULIC PARKING BRAKE)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278

Mode F8: Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

278

Kelsey-Hayes ABS Systems

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

279

KELSEY-HAYES RWAL - ALL VERSIONS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279

Kelsey-Hayes Voltage Check

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

281

Kelsey-Hayes RWAL, ZP RWAL Voltage Check

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

281

Kelsey-Hayes VCM RWAL Voltage Check

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

281

Mode F1: Function Test

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

282


284

RWAL ABS SYSTEMS (EXCEPT ZP RWAL AND VCM RWAL)

. . . . . . . . . . . . . . . 286


286

VCM RWAL ABS SYSTEMS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 288


288

ZP RWAL ABS SYSTEMS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289


289


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

291

VCM RWAL

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

293

RWAL AND ZP RWAL

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296

Mode F4: VSS Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

296

KELSEY-HAYES 4WAL ABS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297

1990-92 Light Trucks Except FWD Vans

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

297

1993-95 Astro, “C” and “K” Series, “G” Series, Safari, “S” and “T” Series

. . . . . . . . .

297

1994-95 “S” and “T” Series Pick-up and Sonoma; 1995 Blazer and Jimmy

. . . . . . . . . . .

297

Kelsey-Hayes RWAL Voltage Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

298


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

298

Mode F2: DTC(s)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

298

Mode F3: Snapshot

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

299


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

300

GM Chassis Application 1986-2004 TOC-v

Mode F8: Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

306

Real Time Dampening/Variable Effort Steering (RTD/EVO)

. . . . . . . . . . . .

307

MODE F0: DATA LIST

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307

MODE F2: DTCS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307

MODE F3: SNAPSHOT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308

F4: OBD CONTROLS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308

Submode F0: RTD Controls

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

308

Teves Mark ABS Systems

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

310

TEVES MARK II ABS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310

Teves Mark II Lamp Sequence Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

310

Teves Mark II ABS Using ScanTool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

317

Mode F0: How To Read

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

319


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

320

Mode F3: Review DTCs

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

321

Mode F4: Clear DTCs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

322

TEVES MARK IV ABS/TCS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323

AntiLock Warning Light

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

323


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

323

Mode F2: DTCs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

323

Mode F3: Snapshot

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

324


. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

324

6. FINISHING UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

330

A. ABS COMMUNICATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

331

B. IF YOU’RE HAVING A PROBLEM . . . . . . . . . . . . . . . . . . . . . . . . .

332

BLANK SCREEN

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332

DISPLAYS SOLID BARS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333

MASTER CARTRIDGE MISSING OR MALFUNCTIONING

. . . . . . . . . . . . . . . . . . . 333

WRONG DISPLAY AFTER POWER APPLIED

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334

NO DATA RECEIVED FROM ABS CONTROLLER

. . . . . . . . . . . . . . . . . . . . . . . . . . . 334

INSTALL BOSCH ABS ADAPTER

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335

NO COMMUNICATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 336

CHECK FOR OPEN/SHORT CIRCUIT

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 336

CHECK CLASS 2 COMMUNICATION HARDWARE

. . . . . . . . . . . . . . . . . . . . . . . . . 337

KEYBOARD OR DISPLAY LOCKED UP OR PROGRAM INTERMITTENTLY

RETURNS TO TITLE SCREEN

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 338

GM Chassis Application 1986-2004 TOC-vi

C. DATA LIST PARAMETERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

339

DELCO MORAINE III & DELCO VI ABS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 340

BOSCH ABS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344

TEVES ABS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 348

KELSEY-HAYES RWAL/4WAL ABS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349

VES

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351

RTD/EVO

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351

D. GLOSSARY AND ABBREVIATIONS . . . . . . . . . . . . . . . . . . . . . . . .

354

INDEX ...........................................................................................

Index-362

GM Chassis Application 1986-2004 TOC-vii

1. GM CHASSIS APPLICATION

DESCRIPTION

The GM Chassis application software is used to diagnose and troubleshoot General Motors passenger cars and trucks that are equipped with anti-lock brakes (ABS) and chassis control systems.

OPERATING MODES

The test modes available vary according to the specific configuration of the vehicle being tested and the system you wish to test. Before testing can begin, the tester prompts you to enter certain information such as the model year, the type of vehicle being tested, the system you wish to test, and other specific information.

How to enter the information is explained in

Chapter 4 .

Once the information is entered, a Select Mode menu is displayed showing the test modes available for the selected vehicle. Only test modes available for the selected vehicle are displayed in the menus. Not all test modes described in this manual are available for every vehicle.

DATA LIST

The Data List mode displays Sensors and Input/Output data reflecting the current operating conditions for various chassis systems. Examples include Wheel Speed sensor data, Vehicle Speed, and Brake Switch status.

DTC(S)

DTC(s) mode displays Diagnostic Trouble Codes recorded by the chassis ECU. The ability to Clear DTC information is also found in this mode.

GM Chassis Application 1986-2004 Page 1

GM ABS Systems 1. GM Chassis Application Description

SNAPSHOT

Snapshot mode gives you the ability to capture Data List information for later analysis. Trigger point and trigger type are selectable by the user.

OBD CONTROLS

OBD Controls mode provides the ability for bi-directional control of a component or device ON and OFF, reset memory values, or write to vehicle memory. Examples include Solenoid tests, Auto Bleed, and Tire

Size Re-calibration.

INFORMATION

Information mode displays helpful information about the vehicle or system under test. This can consist of

ECU part number, Module ID number, or VIN (Vehicle Identification Number).

GM ABS SYSTEMS

The GM Chassis application software covers various chassis systems found on GM vehicles ranging from

1986 to the present. Below is a list of the various ABS Brake Systems found on GM vehicles.

• Delco Moraine ABS III

• Delco ABS VI

• Bosch ABS 2.0, 3.0, 5.0, 5.3, and 8.0

• Teves Mark II, IV

• Delco/Bosch 5.0, 5.3

• DBC 7

• Kelsey-Hayes, Rear Wheel Antilock (RWAL)

• Kelsey-Hayes, Four Wheel Antilock (4WAL)

• ADVICS

There are significant differences in the diagnostic procedures for testing each of the above listed ABS systems, so be certain that you are following the correct operating procedures for the vehicle and ABS system you are testing.

Chapter 3

lists the ABS systems that are selectable for each vehicle.


GM Chassis Systems 1. GM Chassis Application Description

GM CHASSIS SYSTEMS

VARIABLE EFFORT STEERING SYSTEMS

EVO

EVO is a type of variable effort steering system that regulates the amount of effort required by the driver to steer the vehicle under varying conditions by controlling the amount of power steering assist. Power steering assist is reduced as the vehicle speed increases to provide the driver with “road feel” or feedback from the road to improve handling at higher speeds. The effort is controlled by an Electronic Variable

Orifice (EVO) which regulates the amount of power steering fluid flow provided by the vehicle’s power steering pump. The tester can monitor the EVO actuator Duty Cycle and retrieve and clear the system controller’s trouble codes. Some applications allow you to view other related parameters associated with the

EVO system on the screen of the tester. EVO systems are typically found on vehicles equipped with Bosch,

Delco ABS-VI and Teves ABS systems.

MSVA

Magna Steer (MSVA) steering system varies the driver effort required to steer the vehicle as vehicle speed changes. MSVA controls the torque on the input rotary shaft of the steering gear using current controlled by the ABS EBCM. Magna Steer systems can be found on vehicles with Delco-VI and Delco/Bosch ABS systems.

The tester, when plugged into the Data Link Connector, can perform the following functions:

• Display Magna Steer Diagnostic Data Parameters

• Display and Clear Magna Steer Diagnostic Trouble Codes

TRACTION CONTROL SYSTEMS

ASR, ETS and TCS

The tester can diagnose GM’s traction control systems, Acceleration Slip Regulation (ASR), Enhanced

Traction Systems (ETS) and Traction Control Systems (TCS), by displaying Diagnostic Trouble Codes and diagnostic data parameters. Various vehicles equipped with these systems can be tested by controlling outputs for enhanced diagnostic testing.

ELECTRONIC SUSPENSION

ELC, RSS, RTD, SEL, ICCS, AH

The tester can read and display data, Diagnostic Trouble Codes (DTC) and perform interactive tests on electronic suspension control systems such as: Electronic Level Control (ELC), Road Sensing Suspension

(RSS), Real Time Dampening (RTD) and Select Ride Control (SEL), Integrated Chassis Control System

(ICCS) and Active Handling (AH).


GM Chassis Systems 1. GM Chassis Application Description

TIRE INFLATION MONITORING SYSTEM

TIM

Tire Inflation Monitoring (TIM) System, found on newer vehicles equipped with Delco VI ABS systems, detects the differences in tire rotation speeds that are caused by changes in tire pressure. It may not alert the driver if the pressure in more than one tire is high or low. It also may not operate properly if the spare tire is in use.

The TIM system can alert the driver when a large change in the pressure of one tire exists. The system only detects a low pressure condition while the vehicle is being driven.

The “check tire pressure” or “low tire pressure indicator” light turns on in the instrument cluster if the tire pressure in one tire becomes 12 psi (55 kPa) lower or higher than the other three tires and the ignition switch is on the ON position. The message does not appear if more than one tire is low or high, or if the system is not calibrated properly. The system does not inform the driver which tire is low.

TIRE PRESSURE MONITOR SYSTEM

TPM

The Tire Pressure Monitor (TPM) system warns the driver when a significant loss or gain of tire pressure occurs in any of the four tires. It allows the driver to display all four tire pressures and the tire locations on the Driver Information Center (DIC) while the vehicle is being driven.

The system uses the remote control door lock receiver (RCDLR) and a radio frequency (RF) transmitting pressure sensor inside each wheel/tire assembly to measure and collect tire pressure information. The sensors transmit once every 60 seconds to minimize sensor battery consumption. The RCDLR sends the tire pressure and location data to the DIC via the serial data circuit where tire pressures and their locations can be displayed.

When the TPM system detects a significantly under or over inflated tire, the CHECK TIRE PRESSURE warning message is displayed on the DIC. The sensor's pressure accuracy from -10 to +70°C (+14° to

+158°F) is plus or minus 14 kPa (2 psi). The TPM system can also compensate for high and low altitudes using the PCM’s manifold absolute pressure (MAP) sensor input via the serial data circuit.

VEHICLE STABILITY ENHANCEMENT SYSTEM

VSES

The Vehicle Stability Enhancement system (VSES) is activated by the electronic brake control module

(EBCM) which calculates the desired yaw rate and compares it to the actual yaw rate input. The desired yaw rate is calculated from measured steering wheel position, vehicle speed, and lateral acceleration. The difference between the desired yaw rate and actual yaw rate is the yaw rate error, which is a measurement of oversteer or understeer. If the yaw rate error becomes too large, the EBCM attempts to correct the vehicle's yaw motion by applying differential braking to the left or right front wheel.


2. OPERATING PRECAUTIONS

INTRODUCTION

This chapter explains precautions that are very important when using Vetronix testers and application software with a vehicle. Failure to observe these precautions could affect the operation of the tester, the accuracy of data and tests, and at times your safety.

Read all of this chapter before you operate the tester and application software (cartridges). Safeguards have been built into the tester to protect you, the vehicle, and the tester from any hazards. Misuse or improper securing of the vehicle could lead to unsafe conditions.

PRECAUTIONS FOR ALL APPLICATIONS

PROTECT AGAINST REVERSE POLARITY

CAUTION!

CAUTION

If power is applied to the tester and the Tech 1A or Tech 1 display remains blank or the green LED on the MTS 3100 does not illuminate when turned off, reverse polarity in the cigarette lighter may be present. Damage to the tester could occur. DO NOT connect the ALDL/DLC cable to the vehicle.

Verify that the center contact of the vehicle’s cigarette lighter has +12 volts and that the outer contact is grounded.


Precautions for All Applications 2. Operating Precautions

PROTECT AGAINST VOLTAGE SPIKES

CAUTION!

CAUTION

Due to the possibility of voltage spikes that could damage the vehicle or tester, do not connect or disconnect the tester while the ignition key is ON or while the engine is running.

INSTALL/REMOVE CARTRIDGES WITH TESTER OFF

CAUTION!

CAUTION

Do not install or remove application or auxiliary cartridges while power is applied to the tester.

To change or add a cartridge, do the following:

1. Turn the ignition OFF.

2. Disconnect the tester power source—either the cigarette lighter power plug or the ALDL/DLC Cable—from the vehicle.

3. For the MTS 3100, press p x to turn the tester OFF.

4. Change or install the cartridge(s).

5. Reconnect the tester power source—either the cigarette lighter power plug or the ALDL/DLC Cable.

6. Turn the ignition ON.

APPLY PARKING BRAKE

WARNING!

OBD CONTROLS MODE OPERATION

Use care when performing these tests. If used incorrectly, these test can result in personal injury or damage to the ECM, TCM, PCM, VCM, ATC, or AFECU or vehicle. ALWAYS PUT THE PARKING BRAKE ON

AND BLOCK THE WHEELS WHEN USING THIS TEST MODE.

PROTECT SNAPSHOT DATA

CAUTION!

CAUTION

Snapshot data is retained in tester memory for up to 24 hours, even if the tester is disconnected from the vehicle.

If you remove or change master cartridges, or power up the tester without a master cartridge or with a different master cartridge, you will lose the snapshot data.


Precautions for GM Chassis Application 2. Operating Precautions

PRECAUTIONS FOR GM CHASSIS APPLICATION

LOSE ABS BRAKING

The following screen is displayed upon initial communication with newer

GM vehicles. This new screen notifies you that ABS systems does not operate when ABS/TCS MIL Lamps are illuminated.

Caution

ABS Braking is not available when

CAUTION!

CAUTION

Caution

ABS/TCS lamps are illuminated

Caution

Press [ENTER] to Continue

CHECK TESTER INDUCED DTCs

CAUTION!

CAUTION

Under some conditions the tester can cause trouble codes to be set.

Generally these codes are associated with the serial data link. It is important to determine if the trouble codes are set by the tester or are due to a true malfunction in the vehicle.

Check for trouble codes at the start and at the end of testing. If there are codes set at the end of testing—but not at the start—you may assume that they are caused by the tester and should be cleared and ignored.

E, K, V, or Y Body vehicles can use on-board diagnostics or the GM Body

System application to check ECM, BCM, or CCM codes.


3. VEHICLE COVERAGE

Use this section to assist you in operating your Vetronix tester and Chassis Software. It covers everything needed to get your tester connected to the vehicle and begin performing the Chassis system diagnostic functions. It is suggested that you read this manual completely before operating the tester and the Chassis

System Software.

VEHICLE COVERAGE

1986 VEHICLE COVERAGE

1986 BUICK PASSENGER CARS

MODEL

Electra/Park Avenue

BODY VIN

4TH DIGIT

C

SYSTEM

Teves Mark II

ABS

DATA

TYPE

Flash Codes

ADAPTER

CONFIG

GM

1986 CADILLAC PASSENGER CARS

MODEL

DeVille/Fleetwood

BODY VIN

4TH DIGIT

C

SYSTEM

Teves Mark II

ABS

DATA

TYPE

Flash Codes

ADAPTER

CONFIG

GM


Vehicle Coverage 3. Vehicle Coverage

1986 OLDSMOBILE PASSENGER CARS

MODEL

98 Regency

BODY VIN

4TH DIGIT

C

SYSTEM

Teves Mark II

ABS

DATA

TYPE

Flash Codes

ADAPTER

CONFIG

GM

1986 PONTIAC PASSENGER CARS

MODEL

6000 STE

BODY VIN

4TH DIGIT

A

SYSTEM

Teves Mark II

ABS

DATA

TYPE

Flash Codes

ADAPTER

CONFIG

GM



MODEL

Electra, Park Avenue

BODY VIN

4TH DIGIT

C

SYSTEM

Teves Mark II

ABS

DATA

TYPE

Flash Codes

ADAPTER

CONFIG

GM


MODEL

DeVille, Fleetwood

BODY VIN

4TH DIGIT

C

SYSTEM

Teves Mark II

ABS

DATA

TYPE

Flash Codes

ADAPTER

CONFIG

GM




MODEL

98 Regency

BODY VIN

4TH DIGIT

C

SYSTEM

Eighty Eight H

Teves Mark II

ABS

Teves Mark II

ABS

DATA

TYPE

Flash Codes

Flash Codes

ADAPTER

CONFIG

GM

GM


MODEL

6000 STE

BODY VIN

4TH DIGIT

A

SYSTEM

Teves Mark II

ABS


DATA

TYPE

Flash Codes

ADAPTER

CONFIG

GM


MODEL


BODY VIN

4TH DIGIT

C

SYSTEM

Reatta

Riviera

Regal

E

E

W

Teves Mark II

ABS

Teves Mark II

ABS

Teves Mark II

ABS

Delco Moraine III

ABS

DATA

TYPE

Flash Codes

ADAPTER

CONFIG

GM

Flash Codes

Flash Codes

UART

GM

GM

GM




MODEL

DeVille, Fleetwood

BODY VIN

4TH DIGIT

C

SYSTEM

Eldorado

Seville

E

K

Teves Mark II

ABS

Teves Mark II

ABS

Teves Mark II

ABS

DATA

TYPE

Flash Codes

ADAPTER

CONFIG

GM

Flash Codes

Flash Codes

GM

GM


MODEL

98 Regency

BODY VIN

4TH DIGIT

C

SYSTEM

Eighty Eight

Tornado

Cutlass Supreme

C

E

W

Teves Mark II

ABS

Teves Mark II

ABS

Teves Mark II

ABS


ABS

DATA

TYPE

Flash Codes

ADAPTER

CONFIG

GM

Flash Codes

Flash Codes

UART

GM

GM

GM


MODEL

6000 STE

BODY VIN

4TH DIGIT

A

SYSTEM

6000 STE/AWD

Bonneville

Bonneville SSE

Grand Prix

A

H

H

W

Teves Mark II

ABS

Teves Mark II

ABS

Teves Mark II

ABS

Teves Mark II

ABS


ABS

DATA

TYPE

Flash Codes

ADAPTER

CONFIG

GM

Flash Codes

Flash Codes

Flash Codes

UART

GM

GM

GM

GM



1988 LIGHT DUTY TRUCKS

MODEL

C, K Truck

BODY VIN

5TH DIGIT

C/K

SYSTEM

Kelsey-Hayes

RWAL


DATA

TYPE

UART

ADAPTER

CONFIG

GM-R


MODEL


BODY VIN

4TH DIGIT

C

SYSTEM

Riviera

Reatta

Regal

E

E

W

Teves Mark II

ABS

Teves Mark II

ABS

Teves Mark II

ABS


ABS

DATA

TYPE

Flash Codes

ADAPTER

CONFIG

GM

Flash Codes

Flash Codes

UART

GM

GM

GM


MODEL

DeVille, Fleetwood

BODY VIN

4TH DIGIT

C

SYSTEM

Eldorado

Seville

E

K

Teves Mark II

ABS

Teves Mark II

ABS

Teves Mark II

ABS

DATA

TYPE

Flash Codes

ADAPTER

CONFIG

GM

Flash Codes

Flash Codes

GM

GM



1989 CHEVROLET PASSENGER CARS

MODEL

Corvette

BODY VIN

4TH DIGIT

Y

SYSTEM

SEL

DATA

TYPE

UART

ADAPTER

CONFIG

GM


MODEL

98 Regency

BODY VIN

4TH DIGIT

C

SYSTEM

Eighty Eight

Tornado

Cutlass Supreme

C

E

W

Teves Mark II

ABS

Teves Mark II

ABS

Teves Mark II

ABS


ABS

DATA

TYPE

Flash Codes

ADAPTER

CONFIG

GM

Flash Codes

Flash Codes

UART

GM

GM

GM


MODEL

6000 STE

BODY VIN

4TH DIGIT

A

SYSTEM

6000 STE/AWD

Bonneville

Bonneville SSE

Grand Prix

A

H

H

W

Teves Mark II

ABS

Teves Mark II

ABS

Teves Mark II

ABS

Teves Mark II

ABS


ABS

DATA

TYPE

Flash Codes

ADAPTER

CONFIG

GM

Flash Codes

Flash Codes

Flash Codes

UART

GM

GM

GM

GM




MODEL

C, K Truck

BODY VIN

5TH DIGIT

C/K

S, T Truck S/T

SYSTEM

Kelsey-Hayes

RWAL

Kelsey-Hayes

RWAL


DATA

TYPE

UART

UART

ADAPTER

CONFIG

GM-R

GM-R


MODEL


BODY VIN

4TH DIGIT

C

SYSTEM

Riviera

Reatta

Regal

E

E

W

Teves Mark II

ABS

Teves Mark II

ABS

Teves Mark II

ABS


ABS

DATA

TYPE

Flash Codes

ADAPTER

CONFIG

GM

Flash Codes

Flash Codes

UART

GM

GM

GM


MODEL

DeVille, Fleetwood

BODY VIN

4TH DIGIT

C

SYSTEM

Brougham

Eldorado

Seville

D

E

K

Teves Mark II

ABS

Bosch 2U

ABS

Teves Mark II

ABS

Teves Mark II

ABS

DATA

TYPE

Flash Codes

ADAPTER

CONFIG

GM

UART

Flash Codes

Flash Codes

GM-B

GM

GM




MODEL

Corvette

BODY VIN

4TH DIGIT

Y

SYSTEM

Bosch 2S Micro

ABS, SEL

DATA

TYPE

UART

ADAPTER

CONFIG

GM-B


MODEL

98 Regency

BODY VIN

4TH DIGIT

C

SYSTEM

Eighty-Eight

Toronado

Cutlass Supreme

C

E

W

Teves Mark II

ABS

Teves Mark II

ABS

Teves Mark II

ABS


ABS

DATA

TYPE

Flash Codes

ADAPTER

CONFIG

GM

Flash Codes

Flash Codes

UART

GM

GM

GM


MODEL

6000 STE

BODY VIN

4TH DIGIT

A

SYSTEM

6000 STE/AWD

Bonneville

Bonneville SSE

Grand Prix

A

H

H

W

Teves Mark II

ABS

Teves Mark II

ABS

Teves Mark II

ABS

Teves Mark II

ABS


ABS

DATA

TYPE

Flash Codes

ADAPTER

CONFIG

GM

Flash Codes

Flash Codes

Flash Codes

UART

GM

GM

GM

GM




MODEL

C, K Truck

BODY VIN

5TH DIGIT

C/K

Suburban

S, T Truck

Blazer

Van

L/M Van

L/M Van

C/K

S/T

S/T

G

L/M

L/M

SYSTEM

Kelsey-Hayes

RWAL

Kelsey-Hayes

RWAL

Kelsey-Hayes

RWAL

Kelsey-Hayes

RWAL

Kelsey-Hayes

RWAL

Kelsey-Hayes

4WAL 3 Sensor

Kelsey-Hayes

RWAL

DATA

TYPE

UART

UART

UART

UART

UART

UART

UART

ADAPTER

CONFIG

GM-R

GM-R

GM-R

GM-R

GM-R

GM-R

GM-R


Vehicle Coverage



MODEL

Roadmaster

BODY VIN

4TH DIGIT

B

SYSTEM

Wagon

Electra

Reatta

Riviera

Le Sabre

Skylark

Regal

B

C

E

E

H

N

W

Bosch 2U

ABS

Bosch 2U

ABS

Teves Mark IV

ABS

Bosch 2U

ABS

Bosch 2U

ABS

Teves Mark IV

ABS

Delco VI

ABS


ABS

3. Vehicle Coverage

DATA

TYPE

UART

UART

UART

UART

UART

UART

UART

UART

ADAPTER

CONFIG

GM-B

GM

GM

GM

GM-B

GM

GM-B

GM-B


MODEL

DeVille

BODY VIN

4TH DIGIT

C

SYSTEM

Fleetwood

Brougham

Eldorado

Seville

C

D

E

K

Teves Mark IV

ABS

Teves Mark IV

ABS

Bosch 2U

ABS

Bosch 2U

ABS

Bosch 2U

ABS

DATA

TYPE

UART

UART

UART

UART

UART

ADAPTER

CONFIG

GM

GM

GM-B

GM-B

GM-B




MODEL

Caprice

BODY VIN

4TH DIGIT

B

SYSTEM

Corvette Y

Bosch 2U

ABS

Bosch 2S Micro

ABS, SEL

DATA

TYPE

UART

UART

ADAPTER

CONFIG

GM-B

GM-B


MODEL

Custom Cruiser Wagon

BODY VIN

4TH DIGIT

B

SYSTEM

98 Regency

Touring Sedan

Toronado

Eighty Eight

Achieva

Cutlass Calais

Cutlass Supreme

C

C

E

H

N

N

W

Bosch 2U

ABS

Teves Mark IV

ABS

Teves Mark IV

ABS

Bosch 2U

ABS

Teves Mark IV

ABS

Delco VI

ABS, VES

Delco VI

ABS, VES


ABS

DATA

TYPE

UART

UART

UART

UART

UART

UART

UART

UART

ADAPTER

CONFIG

GM-B

GM

GM

GM

GM

GM

GM-B

GM




MODEL

6000 STE

BODY VIN

4TH DIGIT

A

SYSTEM

6000 STE/AWD

Bonneville

Grand Am

Grand Prix

A

H

N

W

Teves Mark II

ABS

Teves Mark II

ABS

Teves Mark IV

ABS

Delco VI

ABS


ABS

DATA

TYPE

Flash Codes

ADAPTER

CONFIG

GM

Flash Codes

UART

UART

UART

GM

GM

GM

GM


MODEL

C, K Truck

BODY VIN

5TH DIGIT

C/K

Suburban

S, T Truck

S, T Truck

(4 door)

Blazer

Van

L/M Van

L/M Van

Tracker

Blazer

C/K

S/T

S/T

S/T

G

L/M

L/M

E/J

V

SYSTEM

Kelsey-Hayes

RWAL

Kelsey-Hayes

RWAL

Kelsey-Hayes

RWAL

Kelsey-Hayes

4WAL 3 Sensor

Kelsey-Hayes

RWAL

Kelsey-Hayes

RWAL

Kelsey-Hayes

RWAL

Kelsey-Hayes

4WAL 3 Sensor

Kelsey-Hayes

RWAL

Kelsey-Hayes

RWAL

DATA

TYPE

UART

UART

UART

UART

UART

UART

UART

UART

UART

Flash Codes

ADAPTER

CONFIG

GM-R

GM-R

GM-R

GM-R

GM-R

GM-R

GM-R

GM-R

GM-R

Jumper Pins

“A” + “H”


Vehicle Coverage



MODEL

Roadmaster

BODY VIN

4TH DIGIT

B

SYSTEM

Wagon

Electra

Reatta

Riviera

Le Sabre

Skylark

Regal

B

C

E

E

H

N

W

Bosch 2U

ABS, VES

Bosch 2U

ABS

Teves Mark IV

ABS

Bosch 2U

ABS

Bosch 2U

ABS

Teves Mark IV

ABS

Delco VI

ABS

Delco VI

ABS


MODEL

DeVille

BODY VIN

4TH DIGIT

C

SYSTEM

Fleetwood

Brougham

Eldorado

Seville

C

D

E

K

Teves Mark IV

ABS, TCS

Teves Mark IV

ABS, TCS

Bosch 2U

ABS, VES

Bosch 2U

ABS

Bosch 2U

ABS

3. Vehicle Coverage

DATA

TYPE

UART

UART

UART

UART

UART

UART

UART

UART

ADAPTER

CONFIG

GM-B

GM

GM

GM

GM-B

GM

GM-B

GM-B

DATA

TYPE

UART

UART

UART

UART

UART

ADAPTER

CONFIG

GM

GM

GM-B

GM-B

GM-B




MODEL

Caprice

BODY VIN

4TH DIGIT

B

SYSTEM

Cavalier

Beretta

Corsica

Lumina

Corvette

J

L

L

W

Y

Bosch 2U

ABS

Delco VI

ABS

Delco VI

ABS

Delco VI

ABS

Delco VI

ABS

Bosch 2S Micro

ABS, ASR, SEL

DATA

TYPE

UART

UART

UART

UART

UART

UART

ADAPTER

CONFIG

GM-B

GM

GM

GM

GM

GM


MODEL


BODY VIN

4TH DIGIT

B

SYSTEM

98 Regency

Touring Sedan

Toronado

Eighty Eight

Achieva

Cutlass Supreme

C

C

E

H

N

W

Bosch 2U

ABS

Teves Mark IV

ABS, TCS

Teves Mark IV

ABS, TCS

Bosch 2U

ABS

Teves Mark IV

ABS, TCS

Delco VI

ABS, VES

Delco VI

ABS

DATA

TYPE

UART

UART

UART

UART

UART

UART

UART

ADAPTER

CONFIG

GM-B

GM

GM

GM-B

GM

GM

GM



1992 SATURN PASSENGER CARS

MODEL

All models

BODY VIN

4TH DIGIT

Z

SYSTEM

Delco VI

ABS, VES


MODEL

Bonneville

BODY VIN

4TH DIGIT

H

SYSTEM

Sunbird

Tempest

Grand Am

Grand Prix

J

L

N

W

Teves

ABS

Delco VI

ABS

Delco VI

ABS

Delco VI

ABS, VES

Delco VI

ABS


MODEL

C, K Truck

BODY VIN

5TH DIGIT

C/K

C, K Truck

Suburban

S, T Truck

C/K

C/K

S/T

SYSTEM

Kelsey-Hayes

RWAL

Kelsey-Hayes

4WAL

Kelsey-Hayes

4WAL

Kelsey-Hayes

RWAL

DATA

TYPE

UART

ADAPTER

CONFIG

GM

DATA

TYPE

UART

UART

UART

UART

UART

ADAPTER

CONFIG

GM-B

GM

GM

GM

GM

DATA

TYPE

UART

UART

UART

UART

ADAPTER

CONFIG

GM-R

GM-R

GM-R

GM-R


Vehicle Coverage

1992 LIGHT DUTY TRUCKS (CONTINUED)

S/T S, T Truck

(2 or 4 door)

Blazer

Van

L/M Van

L/M Van

Tracker

S/T

G

L/M

L/M

E/J

Kelsey-Hayes

4WAL

Kelsey-Hayes

4WAL

Kelsey-Hayes

RWAL

Kelsey-Hayes

RWAL

Kelsey-Hayes

4WAL

Kelsey-Hayes

RWAL

UART

UART

UART

UART

UART

UART

3. Vehicle Coverage

GM-R

GM-R

GM-R

GM-R

GM-R

GM-R

1992 GM ALL-PURPOSE PASSENGER VEHICLES

MODEL

Lumina, Venture,

Tran Sport, Silhouette

BODY VIN

5TH DIGIT

U

SYSTEM

Delco VI

ABS, VES

DATA

TYPE

UART


ADAPTER

CONFIG

GM


MODEL

Roadmaster

BODY VIN

4TH DIGIT

B

SYSTEM

Wagon

Electra

Reatta

B

C

E

Bosch 2U

ABS, VES

Bosch 2U

ABS

Teves Mark IV

ABS

Bosch 2U

ABS, TCS-w/4.3L

DATA

TYPE

UART

UART

UART

UART

ADAPTER

CONFIG

GM-B

GM-B

GM

GM


Vehicle Coverage

1993 BUICK PASSENGER CARS (CONTINUED)

Reatta E UART

Riviera

Riviera

Le Sabre

Skylark

Regal

E

E

H

N

W

Bosch 2U

ABS, TCS-w/out 4.3L

Bosch 2U

ABS, TCS-w/4.3L

Bosch 2U

ABS, TCS-w/out 4.3L

Teves Mark IV

ABS, TCS

Delco VI

ABS

Delco VI

ABS

UART

UART

UART

UART

UART

3. Vehicle Coverage

GM-B

GM

GM-B

GM

GM

GM


MODEL

DeVille

BODY VIN

4TH DIGIT

C

SYSTEM

Fleetwood

Brougham

Eldorado

Eldorado

Seville

Seville

Allante

D

D

E

E

K

K

V

Teves Mark IV

ABS, TCS

Bosch 2U

ABS, TCS, VES

Bosch 2U

ABS, TCS, VES

Bosch 2U

ABS, RSS, ELC

Bosch 2U

ABS, TCS-w/4.6L,

RSS, ELC

Bosch 2U

ABS, RSS, ELC

Bosch 2U

ABS, TCS-w/4.6L,

RSS, ELC

Bosch 2U

ABS, TCS

DATA

TYPE

UART

UART

UART

UART

UART

ADAPTER

CONFIG

GM

GM

GM

GM-B

GM

UART

UART

GM-B

GM

UART GM




MODEL

Caprice

BODY VIN

4TH DIGIT

B

SYSTEM

Camaro

Cavalier

Beretta

Corsica

Lumina

Corvette

F

J

L

L

W

Y

Bosch 2U

ABS

Delco VI

ABS

Delco VI

ABS

Delco VI

ABS

Delco VI

ABS

Delco VI

ABS

Bosch 2S Micro

ABS, ASR, SEL

DATA

TYPE

UART

UART

UART

UART

UART

UART

UART

ADAPTER

CONFIG

GM-B

GM

GM

GM

GM

GM

GM-B

1993 GEO PASSENGER CARS

MODEL

Prizm

BODY VIN

4TH DIGIT

S

SYSTEM

Delco VI

ABS

DATA

TYPE

UART

ADAPTER

CONFIG

GM




MODEL


BODY VIN

4TH DIGIT

B

SYSTEM

Ninety Eight, Regency

Touring Sedan

Toronado

Eighty Eight

Achieva

Cutlass Supreme

C

C

E

H

N

W

Bosch 2U

ABS

Teves Mark IV

ABS, TCS

Teves Mark IV

ABS, TCS

Bosch 2U

ABS

Teves Mark IV

ABS, TCS

Delco VI

ABS, VES

Delco VI

ABS

DATA

TYPE

UART

UART

UART

UART

UART

UART

UART

ADAPTER

CONFIG

GM-B

GM

GM

GM-B

GM

GM

GM


MODEL

Firebird

BODY VIN

4TH DIGIT

F

SYSTEM

Bonneville

Sunbird

Grand Am

Grand Prix

H

J

N

W

Delco VI

ABS

Teves Mark IV

ABS, TCS

Delco VI

ABS

Delco VI

ABS, VES

Delco VI

ABS

DATA

TYPE

UART

UART

UART

UART

UART

ADAPTER

CONFIG

GM

GM

GM

GM

GM




MODEL

All models

BODY VIN

4TH DIGIT

Z

SYSTEM

Delco VI

ABS, TCS

DATA

TYPE

UART

ADAPTER

CONFIG

GM


MODEL

C, K Truck

BODY VIN

5TH DIGIT

C/K

C, K Truck

Suburban

S, T Truck

S, T Truck

Blazer

Van

L/M Van

Tracker

C/K

C/K

S/T

S/T

S/T

G

L/M

E/J

SYSTEM

Kelsey-Hayes

RWAL, ZP RWAL,

VCM RWAL

Kelsey-Hayes

4WAL 3 Sensor or 4 Sensor

Kelsey-Hayes

4WAL

Kelsey-Hayes

RWAL, ZP RWAL,

VCM RWAL

Kelsey-Hayes


Kelsey-Hayes


Kelsey-Hayes

RWAL 3 Sensor or 4 Sensor

Kelsey-Hayes

RWAL,


Kelsey-Hayes

RWAL, ZP RWAL,

VCM RWAL

DATA

TYPE

UART

ADAPTER

CONFIG

GM-R

UART

UART

UART

UART

UART

UART

UART

GM-R

GM-R

GM-R

GM-R

GM-R

GM-R

GM-R

UART GM-R




MODEL

Lumina AVP,


BODY VIN

5TH DIGIT

U

SYSTEM

Delco VI

ABS, VES

DATA

TYPE

UART


ADAPTER

CONFIG

GM


MODEL

Century

BODY VIN

4TH DIGIT

A

SYSTEM

Roadmaster

Wagon


Le Sabre

Skylark

Regal

B

B

C

H

N

W

Delco VI

ABS

Bosch 2U

ABS, VES

Bosch 2U

ABS

Teves Mark IV

ABS, TCS-w/3.8L

8th VIN=L,1

Teves Mark IV

ABS, TCS-w/3.8L

8th VIN=L,1

Delco VI

ABS

Delco VI

ABS

DATA

TYPE

UART

UART

UART

UART

UART

UART

UART

ADAPTER

CONFIG

GM

GM-B

GM-B

OBD II-C2/

GM-16

OBD II-C2/

GM-16

GM

GM




MODEL

Fleetwood

BODY VIN

4TH DIGIT

D

SYSTEM

Eldorado

Concours, DeVille,

Seville

E

K

Bosch 2U

ABS, TCS, VES

Bosch 2U

ABS, TCS-w/4.6L,

RSS, ELC

Bosch 2U

ABS, TCS-w/4.6L,

RSS, ELC

DATA

TYPE

UART

UART

ADAPTER

CONFIG

GM

GM

UART GM


MODEL

Caprice

BODY VIN

4TH DIGIT

B

SYSTEM

Camaro, Z28

Cavalier

Beretta

Corsica

Lumina

Corvette

F

J

L

L

W

Y

Bosch 2U

ABS

Delco VI

ABS, TCS-w/3.4L

8th VIN=S

Delco VI

ABS

Delco VI

ABS

Delco VI

ABS

Delco VI

ABS

Bosch 2U

ABS, TCS, SEL

UART

UART

UART

UART

UART

DATA

TYPE

UART

UART

ADAPTER

CONFIG

GM-B

OBD II-C2/

GM-16

GM

GM

GM

GM

OBD II-C2/

GM-16


MODEL

Prizm

BODY VIN

4TH DIGIT

S

SYSTEM

Delco VI

ABS

DATA

TYPE

UART

ADAPTER

CONFIG

GM




MODEL

Cutlass Ciera

BODY VIN

4TH DIGIT

A

SYSTEM

Ninety Eight, Regency,

Touring Sedan

Ninety Eight, Regency,

Touring Sedan

Eighty Eight

Achieva

Cutlass Supreme

C

C

H

N

W

Delco VI

ABS

Teves Mark IV

ABS, TCS

Teves Mark IV

ABS, TCS-w.3.8L

8th VIN=S

Teves Mark IV

ABS, TCS-w.3.8L

8th VIN=S

Delco VI

ABS, VES

Delco VI

ABS

DATA

TYPE

UART

UART

UART

UART

UART

UART

ADAPTER

CONFIG

GM

GM

OBD II-C2/

GM-16

OBD II-C2/

GM-16

GM

GM


MODEL

BODY VIN

4TH DIGIT

F

SYSTEM

Firebird, Formula

Trans Am

Firebird

Bonneville

Bonneville

Sunbird

Grand Am

Grand Prix

F

H

H

J

N

W

Delco VI

ABS

Delco VI

ABS, TCS-w/3.4L

8th VIN=S

Teves Mark IV

ABS

Teves Mark IV

ABS, TCS-w/3.8L

8th VIN=L,1

Delco VI

ABS

Delco VI

ABS, VES

Delco VI

ABS

DATA

TYPE

UART

UART

UART

UART

UART

UART

UART

ADAPTER

CONFIG

GM

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

GM

GM

GM




MODEL

All models

BODY VIN

4TH DIGIT

Z

SYSTEM

Delco VI

ABS, TCS

DATA

TYPE

UART

ADAPTER

CONFIG

GM


MODEL

C, K Truck

BODY VIN

5TH DIGIT

C/K

Suburban

S, T Truck

S, T Truck

(2 or 4 door)

Blazer

Van

L/M Van

Tracker

C/K

S/T

S/T

S/T

G

L/M

E/J

SYSTEM

Kelsey-Hayes

4WAL 3 Sensor,

VCM 4WAL

OBD II-C-4WAL

Kelsey-Hayes

4WAL 3 Sensor,

VCM 4WAL

OBD II-C-4WAL

Kelsey-Hayes

RWAL, ZP RWAL,

VCM RWAL

Kelsey-Hayes

4WAL 3 Sensor,

VCM 4WAL

OBD II-C-4WAL

Kelsey-Hayes

4WAL 3 Sensor,

VCM 4WAL

OBD II-C-4WAL

Kelsey-Hayes

4WAL 3 Sensor,

VCM 4WAL

OBD II-C-4WAL

Kelsey-Hayes

4WAL 3 Sensor,

VCM 4WAL

OBD II-C-4WAL,

RWAL

Kelsey-Hayes

RWAL, ZP RWAL,

VCM RWAL

DATA

TYPE

Class 2

ADAPTER

CONFIG

GM-R

UART

UART

Class 2

Class 2

UART

UART

UART

GM-R

GM-R

OBD II-C2/

GM-16

OBD II-C2/

GM-16

GM-R

GM-R

GM-R




MODEL

Lumina APV,


BODY VIN

5TH DIGIT

U

SYSTEM

Delco VI

ABS, VES

DATA

TYPE

UART



MODEL

Century

BODY VIN

4TH DIGIT

A

SYSTEM

Roadmaster

Wagon


Riviera

Le Sabre

Skylark

Regal

B

B

C

G

H

N

W

Delco VI

ABS

Bosch 5.0

ABS, VES

Bosch 5.0

ABS, VES

Teves Mark IV

ABS, TCS-w/3.8L

8th VIN=L,1

Teves Mark IV

ABS, TCS-w/4.0L

8th VIN=C

Teves Mark IV

ABS, TCS-w/3.8L

8th VIN=L,1

Delco VI

ABS

Delco VI

ABS

UART

UART

UART

UART

DATA

TYPE

UART

UART

UART

UART

ADAPTER

CONFIG

GM

ADAPTER

CONFIG

GM

GM

GM

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

GM

GM




MODEL

Fleetwood

BODY VIN

4TH DIGIT

D

SYSTEM

Eldorado

Concours, DeVille,

Seville

E

K

Bosch 5.0

ABS, TCS, VES

Bosch 5.0

ABS, TCS-w/4.6L,

RSS, ELC, SWPS

Bosch 5.0

ABS, TCS-w/4.6L,

RSS, ELC, SWPS

DATA

TYPE

UART

UART

ADAPTER

CONFIG

GM

GM

UART GM


MODEL

Caprice

BODY VIN

4TH DIGIT

B

SYSTEM

Camaro, Z28

Camaro, Z28

Camaro, Z28

Cavalier

Cavalier

Cavalier

Beretta

Corsica

Lumina

F

F

F

J

J

J

L

L

W

Bosch 5.0

ABS, VES

Delco VI

ABS

Delco VI

ABS, TCS-w/3.4L

8th VIN=S

Delco VI

ABS, TCS-w/5.7L

8th VIN=P

Delco VI

ABS

Delco VI

ABS, TCS-w/3.2L

8th VIN=D

Delco VI

ABS, TCS-w/2.2L

8th VIN=4

Delco VI

ABS

Delco VI

ABS

Delco VI

ABS, VES

UART

UART

UART

UART

DATA

TYPE

UART

UART

UART

UART

UART

UART

ADAPTER

CONFIG

GM

GM

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

GM

GM

GM

GM

GM



1995 CHEVROLET PASSENGER CARS (CONTINUED)

MODEL

Monte Carlo

Corvette

BODY VIN

4TH DIGIT

W

Y

SYSTEM

Delco VI

ABS, VES

Bosch 2U

ABS, TCS, SEL

DATA

TYPE

UART

UART

ADAPTER

CONFIG

GM

OBD II-C2/

GM-16


MODEL

Metro

BODY VIN

4TH DIGIT

M

SYSTEM

Prizm S

Delco VI

ABS

Delco VI

ABS

DATA

TYPE

UART

UART

ADAPTER

CONFIG

GM

GM


MODEL

Cutlass Ciera

BODY VIN

4TH DIGIT

A

SYSTEM

Ninety Eight, Regency

Aurora

Eighty Eight

Achieva

Cutlass Supreme

C

G

H

N

W

Delco VI

ABS

Teves Mark IV

ABS, TCS-w.3.8L &

8th VIN=S

Teves Mark IV

ABS

ABS, TCS-w.4.0L &

8th VIN=C

Teves Mark IV

ABS, TCS-w.3.8L &

8th VIN=L,1

Delco VI

ABS, VES

Delco VI

ABS

DATA

TYPE

UART

UART

UART

UART

UART

UART

ADAPTER

CONFIG

GM

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

GM




MODEL

BODY VIN

4TH DIGIT

F

SYSTEM

Firebird, Formula

Trans Am

Firebird

Firebird

Bonneville

F

F

H

Delco VI

ABS

Delco VI

ABS, TCS-w/3.4L

8th VIN=S

Delco VI

ABS, TCS-w/5.7L &

8th VIN=P

Teves Mark IV

ABS, TCS-w/3.8L &

8th VIN=L,1

Sunfire

Sunfire

Sunfire

Grand Am

Grand Prix

N

W

J

J

J

Delco VI

ABS

Delco VI

ABS, TCS-w/2.3L &

8th VIN=D

Delco VI

ABS, TCS-w/2.2L &

8th VIN=4

Delco VI

ABS, VES

Delco VI

ABS

DATA

TYPE

UART

UART

UART

UART

UART

UART

UART

UART

UART

ADAPTER

CONFIG

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBDII/

OBD II-C/

GM-16 or GM

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

GM

GM


MODEL

All models

BODY VIN

4TH DIGIT

Z

SYSTEM

Delco VI

ABS, TCS

DATA

TYPE

UART

ADAPTER

CONFIG

GM




MODEL

C, K Truck

BODY VIN

5TH DIGIT

C/K

Suburban

S, T Truck

S, T Truck

(2 or 4 door)

S, T Truck

Blazer

Van

L/M Van

Tracker

C/K

S/T

S/T

S/T

S/T

G

L/M

E/J

SYSTEM

Kelsey-Hayes

4WAL 3 Sensor,

4WAL PCM

Kelsey-Hayes

4WAL 3 Sensor,

4WAL PCM

Kelsey-Hayes

RWAL, ZP RWAL,

VCM RWAL

Kelsey-Hayes

4WAL 3 Sensor,

PCM 4WAL

Kelsey-Hayes

4WAL 3 Sensor

VCM, OBD II-C

Kelsey-Hayes

4WAL 3 Sensor,

4WAL PCM

Kelsey-Hayes

4WAL 3 Sensor,

4WAL PCM

Kelsey-Hayes

4WAL 3 Sensor,

4WAL PCM, RWAL

Kelsey-Hayes

RWAL, ZP RWAL,

VCM RWAL

DATA

TYPE

UART

ADAPTER

CONFIG

GM-R

UART GM-R

UART

UART

UART

UART

UART

Class 2

UART

GM-R

GM-R

OBD II-C2/

GM-16

GM-R

GM-R

GM-R

GM-R


MODEL

Lumina, Venture,


BODY VIN

5TH DIGIT

U/X

SYSTEM

Delco VI

ABS, VES

DATA

TYPE

UART

ADAPTER

CONFIG

GM


Vehicle Coverage



MODEL

Century

BODY VIN

4TH DIGIT

A

SYSTEM

Roadmaster

Wagon

Park Avenue

Riviera

Le Sabre

Skylark

Regal

B

B

C

G

H

N

W

Delco VI

ABS

Bosch 5.0

ABS, VES

Bosch 5.0

ABS, VES

Delco/Bosch 5.0

ABS, TCS, MSVA

Teves Mark IV

ABS, TCS

Delco VI

ABS, TCS, MSVA

Delco VI

ABS

Delco VI

ABS, VES

3. Vehicle Coverage

DATA

TYPE

UART

UART

UART

UART

UART

UART

UART

UART

ADAPTER

CONFIG

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16


MODEL

Fleetwood

BODY VIN

4TH DIGIT

D

SYSTEM

Eldorado

Concours, DeVille,

Seville

E

K

Bosch 5.0

ABS, TCS, VES

Bosch 5.0

ABS, TCS, RSS,

ELC/SWPS

Bosch 5.0

ABS, TCS, RSS,

ELC/SWPS

DATA

TYPE

UART

UART

UART

ADAPTER

CONFIG

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16




MODEL

Caprice

BODY VIN

4TH DIGIT

B

SYSTEM

Camaro, Z28

Cavalier

Beretta

Corsica

Lumina

Monte Carlo

Corvette

F

J

L

L

W

W

Y

Bosch 5.0

ABS, VES

Delco VI

ABS, TCS

Delco VI

ABS, TCS

Delco VI

ABS

Delco VI

ABS

Delco VI

ABS, VES

Delco VI

ABS, VES

Bosch 5.0

ABS, TCS, RTD

DATA

TYPE

UART

UART

UART

UART

UART

UART

UART

UART

ADAPTER

CONFIG

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16


MODEL

Prizm

BODY VIN

4TH DIGIT

S

SYSTEM

Metro M

Delco VI

ABS

Delco VI

ABS

DATA

TYPE

UART

UART

ADAPTER

CONFIG

OBD II-C2/

GM-16

OBD II-C2/

GM-16




MODEL

Cutlass Ciera

BODY VIN

4TH DIGIT

A

SYSTEM

Ninety Eight

Aurora

Eighty Eight, LSS

Achieva

Cutlass Supreme

C

G

H

N

W

Delco VI

ABS

Delco/Bosch 5.0

ABS, TCS

Teves Mark IV

ABS, TCS

Delco/Bosch 5.0

ABS, TCS, MSVA

Delco VI

ABS, VES

Delco VI

ABS, VES

DATA

TYPE

UART

UART

UART

UART

UART

UART

ADAPTER

CONFIG

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16


MODEL

BODY VIN

4TH DIGIT

F

SYSTEM

Firebird, Formula

Trans Am

Bonneville

Sunfire

Grand Am

Grand Prix

H

J

N

W

Delco VI

ABS, TCS

Delco/Bosch 5.0

ABS, TCS, MSVA

Delco VI

ABS, TCS

Delco VI

ABS, VES

Delco VI

ABS, VES

DATA

TYPE

UART

UART

UART

UART

UART

ADAPTER

CONFIG

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16


MODEL

All models

BODY VIN

4TH DIGIT

Z

SYSTEM

Delco VI

ABS, TCS

DATA

TYPE

UART

ADAPTER

CONFIG

OBD II-C2/

GM-16




MODEL

C, K Truck

BODY VIN

5TH DIGIT

C/K

Suburban

S, T Truck

(2 or 4 door)

S, T Truck

Blazer

Van

L/M Van

Tracker

Lumina, Venture,


C/K

S/T

S/T

S/T

G

L/M

E/J

U/X

SYSTEM

Kelsey-Hayes

4WAL 3 Sensor

Kelsey-Hayes

4WAL 3 Sensor

Kelsey-Hayes

4WAL 3 Sensor

Kelsey-Hayes

4WAL 3 Sensor

Kelsey-Hayes

4WAL 3 Sensor

Kelsey-Hayes

4WAL 3 Sensor

Kelsey-Hayes

4WAL 3 Sensor

Delco VI

ABS

Delco VI

ABS, VES

DATA

TYPE

UART

UART

UART

UART

UART

UART

UART

Class 2

UART

ADAPTER

CONFIG

GM-16R

GM-16R

GM-16R

OBD II-C2/

GM-16

GM-16R

GM16-R

GM-16R

OBD II-C2/

GM-16

OBD II-C2/

GM-16


Vehicle Coverage



MODEL

Park Avenue

BODY VIN

4TH DIGIT

C

SYSTEM

Riviera

Le Sabre

Skylark

Century, Regal

G

H

N

W

Delco/Bosch 5.0

ABS, TCS, MSVA,

TIM

Teves Mark IV

ABS, TCS

Delco/Bosch 5.0

ABS, TCS, MSVA

Delco VI

ABS, TCS, EVO

Delco VI

ABS, TCS, ETS, TIM,

VES

DATA

TYPE

Class 2

UART

UART

UART

Class 2

3. Vehicle Coverage

ADAPTER

CONFIG

OBD II-C2

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2


MODEL

Eldorado

BODY VIN

4TH DIGIT

E

SYSTEM

DeVille, Seville K

Delco/Bosch 5.0

ICCS1, ICCS2,

ICCS 2/3, ABS, TCS,

TIM, MSVA

Delco/Bosch 5.0

ICCS2, ICCS 2/3,

ABS, TCS, TIM,

MSVA

DATA

TYPE

Class 2

Class 2

ADAPTER

CONFIG

OBD II-C2

OBD II-C2




MODEL

Cavalier

BODY VIN

4TH DIGIT

J

SYSTEM

Metro

Malibu

Lumina

Monte Carlo

Corvette

Camaro

M

N

W

W

Y

F

Delco VI

ABS, TCS

Delco VI

ABS, TCS

Delco VI

ABS, TCS, EVO

Delco VI

ABS, ETS, TIM,

MSVA

Delco VI

ABS, ETS, TIM,

MSVA

Delco/Bosch 5.0

ABS, TCS, MSVA

Delco VI

ABS

DATA

TYPE

UART

UART

Class 2

UART

UART

Class 2

UART

ADAPTER

CONFIG

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2

OBD II-C2/

GM-16


MODEL

Metro

BODY VIN

4TH DIGIT

M

SYSTEM

Prizm S

Delco VI

ABS

Delco VI

ABS

DATA

TYPE

UART

UART

ADAPTER

CONFIG

OBD II-C2/

GM-16

OBD II-C2/

GM-16




MODEL

Aurora

BODY VIN

4TH DIGIT

G

SYSTEM

Eighty Eight, LSS,

Regency

Achieva

Cutlass

Intrigue

H

N

N

W

Teves Mark IV

ABS, TCS

Delco/Bosch 5.0

ABS, TCS, MSVA

Delco VI

ABS, TCS, EVO

Delco VI

ABS, TCS, EVO

Delco VI

ABS, ETS, TIM,

MSVA

DATA

TYPE

UART

UART

UART

Class 2

Class 2

ADAPTER

CONFIG

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2

OBD II-C2


MODEL

Bonneville

BODY VIN

4TH DIGIT

H

SYSTEM

Sunfire

Grand Am

Grand Prix

Firebird

J

N

W

F

Delco/Bosch 5.0

ABS, TCS, MSVA

Delco VI

ABS, TCS

Delco VI

ABS, TCS, EVO

Delco VI

ABS, VES

Delco VI

ABS, TCS

DATA

TYPE

UART

UART

UART

UART

UART

ADAPTER

CONFIG

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16


MODEL

All models

BODY VIN

4TH DIGIT

Z

SYSTEM

Delco VI

ABS, TCS

DATA

TYPE

Class 2

ADAPTER

CONFIG

OBD II-C2



1997 LIGHT DUTY TRUCKS, VANS, MPVS

MODEL

Tracker

BODY VIN

5TH DIGIT

E/J

SYSTEM

Lumina, Venture,


C, K Truck

Van

Van

Forward Control

S, T Truck

U/X

C/K

G

L/M

P

S/T

Delco VI

ABS

Delco VI

ABS, VES

Kelsey-Hayes

4WAL 3 Sensor

EVO

Kelsey-Hayes

4WAL 3 Sensor

EVO

Kelsey-Hayes

4WAL 3 Sensor

EVO

Kelsey-Hayes

4WAL 3 Sensor

Kelsey-Hayes

4WAL 3 Sensor

DATA

TYPE

UART

UART

UART

Class 2

UART

Class 2

UART

Class 2

UART

UART

ADAPTER

CONFIG

OBD II-C2/

GM-16

OBD II-C2/

GM-16

GM-16R

OBD II-C2

GM-16R

OBD II-C2

GM-16R

OBD II-C2

GM-16R

GM-16R



1997 MEDIUM DUTY TRUCKS

MODEL

T55-T85 Medium, Tilt,

86.0 BBC (F6/F7)

SERIES

C-T Series

C-Series, Crew Cab

(C7)

Bus/Commercial

Chassis Cowl (B7)

D-C Series

T-B7 Chassis

SYSTEM

Kelsey-Hayes

Hydraulic

4WAL 4 Sensor

Kelsey-Hayes

Hydraulic

4WAL 4 Sensor

Kelsey-Hayes

Hydraulic

4WAL 4 Sensor



MODEL

Park Avenue

BODY VIN

4TH DIGIT

C

SYSTEM

Riviera

Le Sabre

Skylark

Century, Regal

G

H

N

W

Delco/Bosch 5.0

ABS, TCS, MSVA,

TIM

Teves Mark IV

ABS, TCS

Delco/Bosch 5.0

ABS, TCS, MSVA

Delco VI

ABS, TCS, EVO

Delco VI

ABS, TCS, ETS, TIM,

VES

DATA

TYPE

UART

UART

UART

DATA

TYPE

Class 2

UART

UART

UART

Class 2

ADAPTER

CONFIG

GM-16R

GM-16R

GM-16R

ADAPTER

CONFIG

OBD II-C2

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2




MODEL

Eldorado

BODY VIN

4TH DIGIT

E

SYSTEM

DeVille, Seville K

Delco/Bosch 5.0

ICCS1, ICCS2,

ICCS 2/3, ABS, TCS,

TIM, MSVA

Delco/Bosch 5.0

ICCS2, ICCS 2/3,

ABS, TCS, TIM,

MSVA

DATA

TYPE

Class 2

Class 2

ADAPTER

CONFIG

OBD II-C2

OBD II-C2


MODEL

Cavalier

BODY VIN

4TH DIGIT

J

SYSTEM

Metro

Malibu

Lumina

Monte Carlo

Corvette

Camaro

M

N

W

W

Y

F

Delco VI

ABS, TCS

Delco VI

ABS, TCS

Delco VI

ABS, TCS, EVO

Delco VI

ABS, ETS, TIM,

MSVA

Delco VI

ABS, ETS, TIM,

MSVA

Delco/Bosch 5.0

ABS, TCS, MSVA

Bosch 5.3

ABS

DATA

TYPE

UART

UART

Class 2

UART

UART

Class 2

UART

ADAPTER

CONFIG

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2

OBD II-C2/

GM-16




MODEL

Aurora

BODY VIN

4TH DIGIT

G

SYSTEM

Eighty Eight, LSS,

Regency

Achieva

Cutlass

Intrigue

H

N

N

W

Teves Mark IV

ABS, TCS

Delco/Bosch 5.0

ABS, TCS, MSVA

Delco VI

ABS, TCS, EVO

Delco VI

ABS, TCS, EVO

Delco VI

ABS, ETS, TIM,

MSVA

DATA

TYPE

UART

UART

UART

Class 2

Class 2

ADAPTER

CONFIG

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2

OBD II-C2


MODEL

Bonneville

BODY VIN

4TH DIGIT

H

SYSTEM

Sunfire

Grand Am

Grand Prix

Firebird

J

N

W

F

Delco/Bosch 5.0

ABS, TCS, MSVA

Delco VI

ABS, TCS

Delco VI

ABS, TCS, EVO

Bosch 5.3

ABS

Bosch 5.3

ABS

DATA

TYPE

UART

UART

UART

UART

UART

ADAPTER

CONFIG

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2/

GM-16


MODEL

Saturn

BODY VIN

4TH DIGIT

Z

SYSTEM

Delco VI

ABS, TCS

DATA

TYPE

Class 2

ADAPTER

CONFIG

OBD II-C2




MODEL

Tracker

BODY VIN

5TH DIGIT

E/J

SYSTEM

Lumina, Venture,


C, K Truck

Van

Van

Forward Control

S, T Truck

U/X

C/K

G

L/M

P

S/T

Delco VI

ABS

Delco VI

ABS, VES, TCS

Kelsey-Hayes

4WAL 3 Sensor

EVO

Kelsey-Hayes

4WAL 3 Sensor

EVO

Kelsey-Hayes

4WAL 3 Sensor

EVO

Kelsey-Hayes

4WAL 3 Sensor

EVO

Kelsey-Hayes

4WAL 3 Sensor

UART

Class 2

UART

Class 2

UART

Class 2

Class 2

DATA

TYPE

UART

UART

Class 2

ADAPTER

CONFIG

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2

GM-16R

OBD II-C2

GM-16R

OBD II-C2

GM-16R

OBD II-C2

OBD II-C2




MODEL


86.0 BBC (F6/F7)

SERIES

C-T Series

C-Series, Crew Cab

(C7)

Bus/Commercial

Chassis Cowl (B7)

D-C Series

T-B7 Chassis

SYSTEM

Kelsey-Hayes

Hydraulic

4WAL 4 Sensor

Kelsey-Hayes

Hydraulic

4WAL 4 Sensor

Kelsey-Hayes

Hydraulic

4WAL 4 Sensor



MODEL

Park Avenue

BODY VIN

4TH DIGIT

C

SYSTEM

Riviera

Le Sabre

Century, Regal

G

H

W

Delco/Bosch 5.0

ABS, TCS, MSVA,

TIM

Teves Mark IV

ABS, TCS

Delco/Bosch 5.0

ABS, TCS, MSVA

DBC7

ABS, TCS, ETS, TIM,

VES

DATA

TYPE

UART

UART

UART

DATA

TYPE

Class 2

UART

UART

Class 2

ADAPTER

CONFIG

GM-16R

GM-16R

GM-16R

ADAPTER

CONFIG

OBD II-C2

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2




MODEL

Eldorado

BODY VIN

4TH DIGIT

E

SYSTEM

DeVille, Seville K

Delco/Bosch 5.0

ICCS1, ICCS2,

ICCS 2/3, ABS, TCS,

TIM, MSVA

Delco/Bosch 5.0

ICCS2, ICCS 2/3,

ABS, TCS, TIM,

MSVA

DATA

TYPE

Class 2

Class 2

ADAPTER

CONFIG

OBD II-C2

OBD II-C2


MODEL

Camaro

BODY VIN

4TH DIGIT

F

SYSTEM

Cavalier

Metro

Malibu

Lumina

Monte Carlo

Corvette

J

M

N

W

W

Y

Bosch 5.3

ABS, ETS, TCS

Delco VI

ABS, TCS, ETS, EVO

Delco VI

ABS

Delco VI

ABS, ETS, VES, TIM

Delco VI

ABS, VES

Delco VI

ABS, VES

Delco/Bosch 5.0

ABS, TCS, MSVA

Active Handling

DATA

TYPE

Class 2

UART

UART

Class 2

UART

UART

Class 2

ADAPTER

CONFIG

OBD II-C2

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2




MODEL

Aurora

BODY VIN

4TH DIGIT

G

SYSTEM

Eighty Eight, LSS

Alero

Cutlass

Intrigue

H

N

N

W

Teves Mark IV

ABS, TCS

Delco/Bosch 5.0

ABS, TCS, MSVA

Delco VI

ABS, ETS, VES, TIM

Delco VI

ABS, TCS, EVO

Delco VI

ABS, ETS, TIM,

MSVA

DATA

TYPE

UART

UART

Class 2

Class 2

Class 2

ADAPTER

CONFIG

OBD II-C2/

GM-16

OBD II-C2/

GM-16

OBD II-C2

OBD II-C2

OBD II-C2


MODEL

Firebird Formula

BODY VIN

4TH DIGIT

F

SYSTEM

Bonneville

Sunfire

Grand Am

Grand Prix

H

J

N

W

Bosch 5.3

ABS, ETS, TCS

Delco/Bosch 5.0

ABS, TCS, MSVA

Delco VI

ABS, TCS

Delco VI

ABS, ETS, VES, TIM

Bosch 5.3

ABS

DATA

TYPE

Class 2

Class 2

UART

Class 2

UART

ADAPTER

CONFIG

OBD II-C2

OBD II-C2

OBD II-C2/

GM-16

OBD II-C2

OBD II-C2/

GM-16


MODEL

Saturn

BODY VIN

4TH DIGIT

Z

SYSTEM

Delco VI

ABS, TCS

DATA

TYPE

Class 2

ADAPTER

CONFIG

OBD II-C2




MODEL

Tracker

BODY VIN

5TH DIGIT

E/J

SYSTEM

Lumina, Venture,


C, K Truck

Van

Van

Forward Control

S, T Truck

U/X

C/K

G

L/M

P

S/T

DBC7

ABS

Delco VI

ABS, VES

Kelsey-Hayes

4WAL 3 Sensor

EVO

Kelsey-Hayes

4WAL 3 Sensor

EVO

Kelsey-Hayes

4WAL 3 Sensor

Kelsey-Hayes

4WAL 3 Sensor

EVO

Kelsey-Hayes

4WAL 3 Sensor

UART

Class 2

Class 2

UART

Class 2

Class 2

DATA

TYPE

Class 2

UART

Class 2

ADAPTER

CONFIG

OBD II-C2

OBD II-C2/

GM-16

OBD II-C2

GM-16R

OBD II-C2

OBD II-C2

GM-16R

OBD II-C2

OBD II-C2


MODEL


86.0 BBC (F6/F7)

SERIES

C-T Series

C-Series, Crew Cab

(C7)

Bus/Commercial

Chassis Cowl (B7)

D-C Series

T-B7 Chassis

SYSTEM

Kelsey-Hayes

Hydraulic

4WAL 4 Sensor

Kelsey-Hayes

Hydraulic

4WAL 4 Sensor

Kelsey-Hayes

Hydraulic

4WAL 4 Sensor

DATA

TYPE

UART

UART

ADAPTER

CONFIG

GM-16R

GM-16R

UART GM-16R


Vehicle Coverage



MODEL

Park Avenue

BODY VIN

4TH DIGIT

C

SYSTEM

Le Sabre

Century, Regal

H

W

Delco/Bosch 5.3

ABS, TCS, DRP,

ICCS3, MSVA, TIM

Delco/Bosch 5.3

ABS, TCS, DRP,

ICCS3, MSVA, TIM

DBC7

ABS, ETS, TCS,

MSVA, TIM

3. Vehicle Coverage

DATA

TYPE

Class 2

ADAPTER

CONFIG

OBD II-C2

Class 2

Class 2

OBD II-C2

OBD II-C2


MODEL

Eldorado

BODY VIN

4TH DIGIT

E

SYSTEM

SLS, STS

DeVille

K

K

Delco/Bosch 5.0

ABS, TCS, MSVA,

TIM

Delco/Bosch 5.3

ABS, DRP, TCS,

MSVA, VSES

Delco/Bosch 5.3

ABS, DRP, TCS,

MSVA, VSES

DATA

TYPE

Class 2

ADAPTER

CONFIG

OBD II-C2

Class 2

Class 2

OBD II-C2

OBD II-C2




MODEL

Camaro

BODY VIN

4TH DIGIT

F

SYSTEM

Cavalier

Metro

Malibu

Lumina

Monte Carlo

Impala

Corvette

J

M

N

W

W

W

Y

Bosch 5.3

ABS, ETS, TCS

DBC7

ABS, ETS

Delco ABS VI

ABS

DBC7

ABS, ETS, MSVA,

TIM

Delco ABS VI

ABS, VES

DBC7

ABS, ETS, MSVA,

TIM

DBC7

ABS, ETS, MSVA,

TIM

Delco/Bosch 5.0

ABS, TCS, MSVA

Active Handling

DATA

TYPE

Class 2

Class 2

UART

Class 2

ADAPTER

CONFIG

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

UART

Class 2

OBD II-C2/

GM-16

OBD II-C2

Class 2

Class 2

OBD II-C2

OBD II-C2


MODEL

Alero

BODY VIN

4TH DIGIT

N

SYSTEM

Intrigue W

Delco VI

ABS, ETS, VES, TIM

Bosch 5.3

ABS, TCS, VES

DATA

TYPE

Class 2

Class 2

ADAPTER

CONFIG

OBD II-C2

OBD II-C2




MODEL

Firebird Formula

BODY VIN

4TH DIGIT

F

SYSTEM

Bonneville

Sunfire

Grand Am

Grand Prix

H

J

N

W

Bosch 5.3

ABS, ETS, TCS

Delco/Bosch 5.3

ABS, TCS, DRP,

ICCS3, MSVA, TIM

DBC7

ABS, ETS

Delco VI

ABS, ETS, VES, TIM

Bosch 5.3

ABS, TCS

DATA

TYPE

Class 2

Class 2

Class 2

Class 2

UART

ADAPTER

CONFIG

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2/

GM-16R


MODEL

Saturn

BODY VIN

4TH DIGIT

Z

SYSTEM

DBC7

ABS, ETS

DATA

TYPE

Class 2

ADAPTER

CONFIG

OBD II-C2


MODEL

Tracker

BODY VIN

5TH DIGIT

E/J

SYSTEM

Chevrolet Venture

Oldsmobile Silhouette

Pontiac Montana

C, K Truck

Old Body Style

U/X

X

U/X

C/K

DBC 7.0

ABS

DBC 7.0

ABS, TCS

DBC 7.0

ABS, TCS

DBC 7.0

ABS, TCS

Kelsey-Hayes

4WAL 3 Sensor

DATA

TYPE

Class 2

Class 2

Class 2

Class 2

Class 2

ADAPTER

CONFIG

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2



2000 LIGHT DUTY TRUCKS, VANS, MPVS (CONTINUED)

MODEL

C, K Truck

New Body Style

Van 4X2

Van 4X2, 4X4

S, T Truck

BODY VIN

5TH DIGIT

C/K

G

L/M

S/T

SYSTEM

Kelsey-Hayes

4WAL 3 Sensor

RTD/EVO

Kelsey-Hayes

4WAL 3 Sensor

Kelsey-Hayes

4WAL 3 Sensor

Kelsey-Hayes

4WAL 3 Sensor

DATA

TYPE

Class 2

UART

Class 2

Class 2

ADAPTER

CONFIG

OBD II-C2

GM-16R

OBD II-C2

OBD II-C2


MODEL


86.0 BBC (F6/F7)

SERIES

C-T Series

C-Series, Crew Cab

(C7)

Bus/Commercial

Chassis Cowl (B7)

D-C Series

T-B7 Chassis

SYSTEM

Kelsey-Hayes

Hydraulic

4WAL 4 Sensor

Kelsey-Hayes

Hydraulic

4WAL 4 Sensor

Kelsey-Hayes

Hydraulic

4WAL 4 Sensor

DATA

TYPE

UART

ADAPTER

CONFIG

GM-16R

UART

UART

GM-16R

GM-16R


Vehicle Coverage



MODEL

Park Avenue

BODY VIN

4TH DIGIT

C

SYSTEM

Le Sabre

Century, Regal

H

W

Delco/Bosch 5.3

ABS, TCS, DRP,

ICCS3, MSVA, TIM

Delco/Bosch 5.3

ABS, TCS, DRP,

ICCS3, MSVA, TIM

DBC7

ABS, ETS, TCS,

MSVA, TIM

3. Vehicle Coverage

DATA

TYPE

Class 2

ADAPTER

CONFIG

OBD II-C2

Class 2

Class 2

OBD II-C2

OBD II-C2


MODEL

Eldorado

BODY VIN

4TH DIGIT

E

SYSTEM

DeVille, Seville K

Delco/Bosch 5.0

ABS, TCS, DRP,

ICCS3, MSVA, TIM

Delco/Bosch 5.3

ABS, DRP, TCS,

MSVA, VSES

DATA

TYPE

Class 2

ADAPTER

CONFIG

OBD II-C2

Class 2 OBD II-C2




MODEL

Camaro

BODY VIN

4TH DIGIT

F

SYSTEM

Cavalier

Metro

Malibu

Lumina

Monte Carlo, Impala

Corvette

J

M

N

W

W

Y

Bosch 5.3

ABS, ETS, TCS

DBC7

ABS, ETS

Delco VI

ABS

DBC7

ABS, ETS, MSVA,

TIM

Delco VI

ABS, VES

DBC7

ABS, ETS, MSVA,

TIM

Delco/Bosch 5.0

ABS, TCS, MSVA

Active Handling

DATA

TYPE

Class 2

Class 2

Class 2

Class 2

ADAPTER

CONFIG

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

UART

Class 2

OBD II-C/

GM-16

OBD II-C2

Class 2 OBD II-C2


MODEL

Aurora

BODY VIN

4TH DIGIT

G

SYSTEM

Alero

Intrigue

N

W

Delco/Bosch 5.3

ABS, TCS, MSVA,

TIM

DBC7

ABS, ETS, VES, TIM

Bosch 5.3

ABS, TCS, VES

DATA

TYPE

Class 2

Class 2

Class 2

ADAPTER

CONFIG

OBD II-C2

OBD II-C2

OBD II-C2




MODEL

Firebird Formula

BODY VIN

4TH DIGIT

F

SYSTEM

Bonneville

Sunfire

Grand Am

Grand Prix

H

J

N

W

Bosch 5.3

ABS, ETS, TCS

Delco/Bosch 5.3

ABS, TCS, DRP,

ICCS3, MSVA, TIM

DBC7

ABS, ETS

Delco VI

ABS, ETS, VES, TIM

Bosch 5.3

ABS, TCS

DATA

TYPE

Class 2

Class 2

Class 2

Class 2

UART

ADAPTER

CONFIG

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

GM-16R


MODEL

Saturn

BODY VIN

4TH DIGIT

Z

SYSTEM

DBC7

ABS, ETS

DATA

TYPE

Class 2

ADAPTER

CONFIG

OBD II-C2


MODEL

Pontiac Aztec

BODY VIN

5TH DIGIT

A/B

SYSTEM

C, K Truck

Old Body Style

C, K Truck

New Body Style

Tracker

C/K

C/K

E/J

Bosch 5.3

ABS

Kelsey-Hayes

4WAL, 3 Sensor

Kelsey-Hayes

4WAL 3 Sensor

RTD/EVO

DBC 7.0

ABS

Class 2

DATA

TYPE

Class 2

Class 2

Class 2

ADAPTER

CONFIG

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2



2001 LIGHT DUTY TRUCKS, VANS, MPVS (CONTINUED)

MODEL

Van 4X2

Van 4X2, 4X4

S, T Truck

Chevrolet Venture


Pontiac Montana

BODY VIN

5TH DIGIT

G

M/L

S/T

U/X

U/X

U/X

SYSTEM

Kelsey-Hayes

4WAL, 3 Sensor

Kelsey-Hayes

4WAL, 3 Sensor

Kelsey-Hayes

4WAL, 3 Sensor

DBC7

ABS, TCS

DBC7

ABS, TCS

DBC7

ABS, TCS

DATA

TYPE

UART

Class 2

Class 2

Class 2

Class 2

Class 2

ADAPTER

CONFIG

GM-16R

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2


MODEL


86.0 BBC (F6/F7)

SERIES

C-T Series

C-Series, Crew Cab

(C7)

Bus/Commercial

Chassis Cowl (B7)

D-C Series

T-B7 Chassis

SYSTEM

Kelsey-Hayes

Hydraulic

4WAL, 4 Sensor

Kelsey-Hayes

Hydraulic

4WAL, 4 Sensor

Kelsey-Hayes

Hydraulic

4WAL, 4 Sensor

DATA

TYPE

UART

UART

ADAPTER

CONFIG

GM-16R

GM-16R

UART GM-16R





MODEL

Park Avenue

BODY VIN

(4TH)

C

SYSTEM

Le Sabre

Century

Regal

H

W

W

Delco/Bosch 5.3

ABS, TCS, DRP, ICCS3,

MSVA, TIM

Delco/Bosch 5.3


MSVA, TIM

DBC7

ABS, ETS, TCS, MSVA,

TIM

DBC7

ABS, ETS, TCS, MSVA,

TIM


MODEL

El Dorado

BODY VIN

(4TH)

E

SYSTEM

DeVille

Seville

K

K

Delco/Bosch 5.0

ABS, TCS, TIM, MSVA

Delco/Bosch 5.3

ABS, TCS, DRP, MSVA,

VSES

Delco/Bosch 5.3

ABS, TCS, DRP, MSVA,

VSES

DATA

TYPE

Class 2

ADAPTER

CONFIG.

OBD II-C2

Class 2

Class 2

Class 2

Class 2

OBD II-C2

OBD II-C2

OBD II-C2

DATA

TYPE

Class 2

Class 2

ADAPTER

CONFIG.

OBD II-C2

OBD II-C2

OBD II-C2


MODEL

Camaro

BODY VIN

(4TH)

F

SYSTEM

Cavalier

Malibu

Impala

Monte Carlo

J

N

W

W

Bosch 5.3

ABS, TCS, ETS

DBC7

ABS, ETS

DBC7

ABS, ETS, MSVA, TIM

DBC7

ABS, ETS, MSVA, TIM

DBC7

ABS, ETS, MSVA, TIM

DATA

TYPE

Class 2

Class 2

Class 2

Class 2

Class 2

ADAPTER

CONFIG.

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2



2002 CHEVROLET PASSENGER CARS (CONTINUED)

MODEL

Corvette

BODY VIN

(4TH)

Y

SYSTEM

Delco/Bosch 5.0

ABS, TCS, MSVA,

Active Handling

DATA

TYPE

Class 2

ADAPTER

CONFIG.

OBD II-C2


MODEL

Aurora

BODY VIN

(4TH)

G

SYSTEM

Alero

Intrigue

N

W

Delco/Bosch 5.3

ABS, TCS, MSVA, TIM

DBC7

ABS, ETS, MSVA, TIM

Bosch 5.3

ABS, TCS, VES

DATA

TYPE

Class 2

Class 2

Class 2

ADAPTER

CONFIG.

OBD II-C2

OBD II-C2

OBD II-C2


MODEL

Firebird

BODY VIN

(4TH)

F

SYSTEM

Formula

Bonneville

Sunfire

Grand Am

Grand Prix

F

H

J

N

W

Bosch 5.3

ABS, TCS, ETS

Bosch 5.3

ABS, ETS, TCS

Delco/Bosch 5.3


MSVA, TIM

DBC7

ABS, ETS

DBC7

ABS, ETS, MSVA, TIM

Bosch 5.3

ABS/TCS

DATA

TYPE

Class 2

Class 2

Class 2

ADAPTER

CONFIG.

OBD II-C2

OBD II-C2

OBD II-C2

Class 2

Class 2

UART

OBD II-C2

OBD II-C2

OBD II-C2/

GM-16


MODEL

S-Series

BODY VIN

(4TH)

Z

SYSTEM

DBC7

ABS, TCS

DATA

TYPE

Class 2

ADAPTER

CONFIG.

OBD II-C2



2002 BUICK, CHEVROLET, GMC, OLDSMOBILE, PONTIAC

LIGHT TRUCKS, VANS, MPVs

MODEL

Buick Rendezvous

Pontiac Aztek

C, K Truck

Tracker

Van 4x2

Van 4x2, 4x4

S, T Truck

Chevrolet Avalanche

Chevrolet Silverado

Chevrolet Suburban

Chevrolet Tahoe

GMC Sierra

GMC Yukon

Chevrolet Express

GMC Savana

Chevrolet Astro

BODY VIN

(5TH)

A/B

A/B

C/K

E/J

G

M/L

S/T

C/K

C/K

C/K

C/K

C/K

C/K

G

G

M/L

SYSTEM

Bosch 5.3

ABS/TCS

Bosch 5.3

ABS/TCS

Kelsey-Hayes

4WAL 3 Sensor

RTD/EVO

DBC7

ABS

Kelsey-Hayes

4WAL 3 Sensor

Kelsey-Hayes

4WAL 3 Sensor

Kelsey-Hayes

4WAL 3 Sensor

Kelsey-Hayes

4WAL, 3 Sensor

RTD/EVO

Kelsey-Hayes

4WAL, 3 Sensor

RTD/EVO

Kelsey-Hayes

4WAL, 3 Sensor

RTD/EVO

Kelsey-Hayes

4WAL, 3 Sensor

RTD/EVO

Kelsey-Hayes

4WAL, 3 Sensor

RTD/EVO

Kelsey-Hayes

4WAL, 3 Sensor

RTD/EVO

Kelsey-Hayes

4WAL, 3 Sensor

Kelsey-Hayes

4WAL, 3 Sensor

Kelsey-Hayes

4WAL, 3 Sensor

DATA

TYPE

Class 2

Class 2

Class 2

Class 2

UART

Class 2

Class 2

Class 2

Class 2

Class 2

Class 2

Class 2

Class 2

UART

UART

Class 2

ADAPTER

CONFIG.

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

GM-16R

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

GM-16R

GM-16R

OBD II-C2



2002 BUICK, CHEVROLET, GMC, OLDSMOBILE, PONTIAC

LIGHT TRUCKS, VANS, MPVs (CONTINUED)

MODEL

GMC Safari

Chevrolet S-10 Pickup

Chevrolet Blazer

GMC Sonoma

GMC Jimmy

Chevrolet Venture


Pontiac Montana

Cadillac Escalade,

Escalade EXT

Forward Control

Chevrolet Trailblazer

GMC Envoy

Oldsmobile Bravada

BODY VIN

(5TH)

M/L

S/T

S/T

S/T

S/T

U/V/X

U/V/X

U/V/X

C/K

P

S/T

S/T

S/T

SYSTEM

Kelsey-Hayes

4WAL, 3 Sensor

Kelsey-Hayes

4WAL, 3 Sensor

Kelsey-Hayes

4WAL, 3 Sensor

Kelsey-Hayes

4WAL, 3 Sensor

Kelsey-Hayes

4WAL, 3 Sensor

DBC7

ABS, TCS

DBC7

ABS, TCS

DBC7

ABS, TCS

Kelsey-Hayes

4WAL, 3 Sensor

RTD/EVO

Kelsey-Hayes

ABS

Kelsey-Hayes

4WAL

Kelsey-Hayes

4WAL

Kelsey-Hayes

4WAL

DATA

TYPE

Class 2

Class 2

Class 2

Class 2

Class 2

Class 2

Class 2

Class 2

Class 2

UART

Class 2

Class 2

Class 2

ADAPTER

CONFIG.

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

GM-16R

OBD II-C2

OBD II-C2

OBD II-C2


MODEL

C-T Series

D-C Series

BODY VIN

(5TH)

T55-T85

Medium,

TILT, 86.0

BBC (F6/F7)

C-Series

Crew Cab

(C7)

SYSTEM

Kelsey-Hayes Hydraulic

4WAL, 4 SENSOR


4WAL, 4 SENSOR

DATA

TYPE

UART

ADAPTER

CONFIG.

GM-16R

UART GM-16R



2002 MEDIUM DUTY TRUCKS (CONTINUED)

MODEL

T-B7 Chassis

BODY VIN

(5TH)

Bus/

Commercial

Chassis Cowl

(B7)

SYSTEM


4WAL, 4 SENSOR

DATA

TYPE

UART

ADAPTER

CONFIG.

GM-16R



MODEL

Park Avenue, Ultra

BODY VIN

(4TH)

C

SYSTEM

Le Sabre

Century, Regal

H

W

Delco/Bosch 5.3

ABS, DRP, TCS

Delco/Bosch 5.3

ABS, DRP, TCS

DBC7

ABS, ETS, MSVA, TIM

DATA

TYPE

Class 2

Class 2

Class 2

ADAPTER

CONFIG.

OBD II-C2

OBD II-C2

OBD II-C2


MODEL

CTS

BODY VIN

(4TH)

D

SYSTEM

DeVille,

Seville SLS, STS

K

DBC7

ABS, DRP

Delco/Bosch 5.3

ABS, DRP, TCS


MODEL

Cavalier

BODY VIN

(4TH)

J

SYSTEM

Malibu

Impala, Monte Carlo

Corvette

N

W

Y

DBC7

ABS, ETS

DBC7

ABS, ETS, MSVA, TIM

DBC7

ABS, DRP, TCS, MSVA,

TIM

Delco/Bosch 5.3

ABS, TCS, VES

DATA

TYPE

Class 2

Class 2

ADAPTER

CONFIG.

OBD II-C2

OBD II-C2

DATA

TYPE

Class 2

Class 2

Class 2

ADAPTER

CONFIG.

OBD II-C2

OBD II-C2

OBD II-C2

Class 2 OBD II-C2




MODEL

Aurora

BODY VIN

(4TH)

G

SYSTEM

Alero N

Delco/Bosch 5.3

ABS, DRP, TCS

DBC7

ABS, ETS, MSVA, TIM


MODEL

Bonneville

BODY VIN

(4TH)

H

SYSTEM

Sunfire

Grand Am

Grand Prix

J

N

W

Delco/Bosch 5.3

ABS, DRP, TCS

DBC7

ABS, ETS

DBC7

ABS, ETS, MSVA, TIM

Bosch 5.3

ABS


MODEL

ION

BODY VIN

(4TH)

A

SYSTEM

Bosch 8.0

ABS, DRP

DATA

TYPE

Class 2

Class 2

ADAPTER

CONFIG.

OBD II-C2

OBD II-C2

DATA

TYPE

Class 2

Class 2

Class 2

UART

ADAPTER

CONFIG.

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2/

GM-16

DATA

TYPE

Class 2

ADAPTER

CONFIG.

OBD II-C2

2003 CHEVROLET, GMC, OLDSMOBILE, PONTIAC LIGHT

TRUCKS, VANS, MPVs

MODEL

Aztek, Rendezvous

Avalanche, Escalade/

EXT, Sierra, Silverado,

Suburban, Tahoe, Yukon

Express, Savana

Astro, Safari

BODY VIN

(5TH)

A/B

C/K

G

L/M

SYSTEM

Bosch 5.3

ABS, TCS, TPM

Kelsey-Hayes

ABS, TCS (if equipped)

RTD/EVO

Kelsey-Hayes

ABS

Kelsey-Hayes

ABS

DATA

TYPE

Class 2

Class 2

Class 2

Class 2

ADAPTER

CONFIG.

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2




TRUCKS, VANS, MPVs (CONTINUED)

MODEL

Tracker

Forward Control

BODY VIN

(5TH)

E/J

P

S/T

SYSTEM

DBC7

ABS

Kelsey-Hayes

ABS

Kelsey-Hayes

ABS, TCS (if equipped)

DATA

TYPE

Class 2

UART

Class 2

ADAPTER

CONFIG.

OBD II-C2

GM-16R

OBD II-C2 S-10, Jimmy, Sonoma,

Blazer, Bravada, Envoy,

Trailblazer

Montana, Silhouette,

Venture

Hummer H2

U/V/X

N

DBC7

ABS, TCS

Bosch 5.3

ABS

Class 2

Class 2

OBD II-C2

OBD II-C2

2003 CHEVROLET/GMC MEDIUM DUTY TRUCKS

SERIES

T-B7 Chassis

D-C Series

C-T Series

B-W4 Series

BODY VIN

(5TH)

--

--

--

--

SYSTEM

4WAL, 4 Sensor

4WAL, 4 Sensor

4WAL, 4 Sensor

ABS

DATA

TYPE

Class 2

Class 2

Class 2

Class 2

ADAPTER

CONFIG.

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2



MODEL

Park Avenue, Ultra

BODY VIN

(4TH)

C

SYSTEM

Le Sabre

Century, Regal

H

W

Delco Bosch 5.3

ABS, DRP, TCS

Delco Bosch 5.3

ABS, DRP, TCS

DBC7

ABS, ETS, MSVA, TIM

DATA

TYPE

Class 2

Class 2

Class 2

ADAPTER

CONFIG.

OBD II-C2

OBD II-C2

OBD II-C2




MODEL

CTS

BODY VIN

(4TH)

D

SYSTEM

Deville, DHS, DTS,

Seville SLS and STS

K

Delco Bosch 7.2

ABS, DRP, TCS

Delco Bosch 5.3

DRP, TCS, MSVA

DATA

TYPE

Class 2

Class 2

ADAPTER

CONFIG.

OBD II-C2

OBD II-C2


MODEL

Cavalier

BODY VIN

(4TH)

J

SYSTEM

Classic

Impala, Monte Carlo

Corvette

N

W

Y

DBC7

ABS, ETS

DBC7

ABS, ETS, MSVA, TIM

DBC7

ABS, DRP, ETS, MSVA,

TIM

Delco Bosch 5.3

ABS, TCS, VES


MODEL

Alero

BODY VIN

(4TH)

N

SYSTEM

DBC7

ABS, ETS, MSVA, TIM


MODEL

Bonneville

BODY VIN

(4TH)

H

SYSTEM

Sunfire

Grand Am

Grand Prix

J

N

W

Delco Bosch 5.3

ABS, DRP, TCS

DBC7

ABS, ETS

DBC7

ABS, ETS, MSVA, TIM

Delco Bosch 5.3

ABS, TCS, TPM, VES,

VSES

DATA

TYPE

Class 2

Class 2

Class 2

ADAPTER

CONFIG.

OBD II-C2

OBD II-C2

OBD II-C2

Class 2 OBD II-C2

DATA

TYPE

Class 2

ADAPTER

CONFIG.

OBD II-C2

DATA

TYPE

Class 2

Class 2

Class 2

Class 2

ADAPTER

CONFIG.

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2


Vehicle Coverage


MODEL

ION

BODY VIN

(4TH)

A

SYSTEM

Bosch 8.0

ABS, DRP

3. Vehicle Coverage

DATA

TYPE

Class 2

ADAPTER

CONFIG.

OBD II-C2

2004 HUMMER LIGHT DUTY TRUCKS

SERIES

H2

BODY VIN

(5TH)

N

SYSTEM

Delco Bosch 5.3

DATA

TYPE

Class 2

ADAPTER

CONFIG.

OBD II-C2


TRUCKS, VANS, MPVs

MODEL

Aztec, Rendezvous

Sierra, Silverado,

Suburban, Tahoe,

Escalade

SRX

BODY VIN

(5TH)

A/B

C/K

E

SYSTEM

Delco Bosch 5.3

ABS, DRP, TCS

Kelsey-Hayes

ABS, TCS

DATA

TYPE

Class 2

Class 2

Class 2

ADAPTER

CONFIG.

OBD II-C2

OBD II-C2

OBD II-C2

Express, Savana

Tracker

Astro, Safari

Blazer, Bravada, S-10,

Envoy, Trailblazer,

Sonoma, Jimmy, Rainer

Canyon, Colorado

G/H

J

L/M

S/T

S/T

DBC7.2

ABS, DRP, TCS, VSES,

BAS

Kelsey-Hayes

ABS, TCS

DBC7

ABS

Kelsey-Hayes

ABS

Kelsey-Hayes

ABS, TCS

Class 2

Class 2

Class 2

Class 2

Class 2

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2

Montana, Silhouette,

Venture

U/V/X

ADVICS

ABS, TCS

DBC7

ABS, TCS

Class 2 OBD II-C2



2004 CHEVROLET/GMC MEDIUM DUTY TRUCKS

SERIES

T-B7 Chassis

BODY VIN

(5TH)

--

SYSTEM

D-C Series

C-T Series

B-W4 Series

--

--

--

Kelsey-Hayes

4WAL

Kelsey-Hayes

4WAL

Kelsey-Hayes

4WAL

Kelsey-Hayes

4WAL

DATA

TYPE

Class 2

Class 2

Class 2

Class 2

ADAPTER

CONFIG.

OBD II-C2

OBD II-C2

OBD II-C2

OBD II-C2


4. GETTING STARTED

This chapter provides information to assist you in operating your Vetronix tester and software application. In addition to helping you identify vehicles covered by the software, it shows you how to connect your tester to the vehicle and explains how to begin performing system diagnostic functions. It is suggested that you read this manual completely before operating the tester and the system software.


Setting Up the Tester 4. Getting Started

SETTING UP THE TESTER

MTS 3100

Before you operate the application software, do the following:

1. Make sure the vehicle ignition is OFF.

2. Connect the tester DLC (formerly called the ALDL) cable to the tester and tighten the screws.

3. Insert the cartridge into the slot at the top rear of the tester.

FIGURE 4-1. Inserting Cartridge into the MTS 3100

Application Cartridge or Mass Storage

Cartridge (MSC)

MTS 3100

4. Install the appropriate adapter to the tester DLC cable. Refer to

Adapter and Adapter Cable

Configurations on page 80

for information on selecting the correct adapters.

5. Locate the vehicle's DLC. Connect the DLC cable, or the adapter attached to the end of the DLC cable, to the vehicle. Continue to

Powering Up the Tester on page 75

.



TECH 1A

Before you operate the Tech 1A, do the following:



3. Insert the application into the Master Cartridge slot on the bottom, rear of the tester. Verify that no other

“Master” cartridge is installed in the tester.

If the system being tested uses Class 2 data type, Alliance and aftermarket service centers using a Tech

1A tester must also insert the OBD II Interface Cartridge into the top slot of the Tech 1A.

FIGURE 4-2. Inserting a Cartridge into the Tech 1A

Tech 1A


Cartridge (MSC)






Powering Up the Tester on page 75

.



TECH 1

Before you operate the Tech 1, do the following:



NOTE

If you are testing a vehicle with an RWAL or 4WAL system you must use a revised 12-pin DLC cable (P/N 02001578) to connect the tester to the vehicle. The revised cable is easily identified by the power port built into the connector on the vehicle end of the cable. The revised cable works with all other vehicle systems and tester cartridges.

3. Insert the application into the Master Cartridge slot on the bottom, rear of the tester. Verify that no other

“Master” cartridge is installed in the tester.

FIGURE 4-3. Inserting a Cartridge into the Tech 1

Tech 1


Cartridge (MSC)






Powering Up the Tester

.


Powering Up the Tester 4. Getting Started

POWERING UP THE TESTER

1988-95 vehicles equipped with a 12 pin DLC require powering the tester via the DC Power Cable. Connect the DC Power Cable to the vehicle cigarette lighter or the optional Battery Adapter Cable which connects to the vehicle battery.

When testing a 1995-to present vehicles equipped with a 16-pin DLC, the tester is powered through the

DLC Cable (except when using a Tech 1 tester). Continue to

Selecting the Application

.

SELECTING THE APPLICATION

1. Once the tester is powered, one of the following screens is displayed:

Vetronix Corp.

High Capacity

16MB MSC vX.X

(c) 2004 [ENTER]

16MB Mass Storage

Cartridge (MSC)

Vetronix Corp.

General Motors

Diagnostics

(c) 2004 vX.X

General Motors

Diagnostic Cartridge

Press u or wait two seconds to proceed to the Applications menu screen. If the display is not correct, see

Appendix A .

The available software applications are displayed:

APPLICATIONS

GM P/T

→ GM CHASSIS

GM BODY

2. Select the application. If your application is on a MSC, use the U and D keys to move the cursor

(arrow) and press E. If the application is on a MAC, select the function key next to the desired application.

The GM Body Systems title screen is displayed.

GENERAL MOTORS

CHASSIS

1986-2004

Vx.x [ENTER]


Selecting the Application 4. Getting Started

3. If the display is correct, turn the ignition ON and you are ready to proceed with selecting the vehicle

model year. Continue to

Selecting the Model Year on page 77

.

If the display reads:

MASTER CARTRIDGE

IS MISSING OR

MALFUNCTIONING

This means that the tester is receiving power but the cartridge is not making good contact, or else the wrong DLC cable and/or adapter are installed. If this happens, do the following:

• Remove and reinsert the cartridge making sure that the cartridge is properly seated.

• Verify that the correct DLC cable is installed.

• See Step 4 to determine if the vehicle you are testing requires a DLC cable adapter. If an adapter is

required, verify that the correct one is installed.

If the display is blank, the tester is not receiving power. In this case, perform the following checks:

• Disconnect and reconnect the tester DC power plug at the cigarette lighter socket.

• Make sure that both the tester DC power plug and cigarette lighter socket have good, clean contacts.

• Verify that 12V power is available at the center contact of the cigarette lighter socket, and that the outside contact of the lighter socket is grounded.

• Check the vehicle's cigarette lighter fuse.

• Check the fuse in the cigarette lighter plug on the end of the tester DC power cable.

If the display is still not correct, Appendix B

lists possible causes for the malfunction and recommendations to remedy the problem. If the problem persists, perform the tester Self-test as described in the basic tester

Operator's Manual.

NOTE

The tester Self-test will not operate with the GM Chassis Software

Cartridge installed.

E

) - (

U , D

X

ACTIVE KEYS

Confirm displayed information is correct.

Advance to next display.

Select previously tested vehicle.

Used to select a menu item.

Used to select menu item.

Stop automatic menu scroll.

Manually scroll menu.

Return to previous display.


Perform Vehicle and/or System Selection 4. Getting Started

PERFORM VEHICLE AND/OR SYSTEM

SELECTION

SELECTING THE MODEL YEAR

1. From the power-up menu, press E to enter the vehicle selection mode.

2. If the tester “remembers” the last vehicle you tested, it gives you the option of continuing with the testing of that vehicle. Enter the model year on the keypad to start testing of a new vehicle, or press y

to continue testing the same vehicle. Generally, the tester “remembers” the previous vehicle under test if it has been less than 24 hours and you have not removed application cartridge from the tester.

NOTE

If you select a new vehicle, or the same vehicle as before but do not press y

, any data saved from previous testing is erased. This includes

Snapshot and Review Codes.

3. The model year selection screen defaults to the current year. The u or d arrow key scrolls through the available model years.

NOTE

Holding down the u or d arrow key results in fast scrolling.

SELECT

MODEL YEAR

2004 (4)

U D

[ENTER]

Scrolling Arrows

The brackets to the right of the model year represent the 10th VIN digit (year identifier) for easier model year identification.

SELECT

MODEL YEAR

2004 (4)

U D

[ENTER]

Vehicle 10th

VIN Digit Model Year identifier

When the correct model year appears on the screen, press the E key to advance the software to the next vehicle selection screen.

Quick keys are also available for entering the model year. From the SELECT MODEL YEAR screen, select the last two digits of the model year from the key pad to advance to the next vehicle selection screen (For example, pressing 9 and 2 selects 1992). Pressing x returns the software back to the

SELECT MODEL YEAR screen.



SELECTING THE VEHICLE USING THE VIN

The Vehicle Selection process is done by pressing the numeric keys indicating the last two digits of the model year. After the model year has been selected you will be asked to select a vehicle type. If F0:

PASSENGER CAR was selected, you will be asked to select the 4th digit of the VIN code (vehicle body type). If F1: LIGHT TRUCK was selected you will be asked to select the 5th digit of the VIN. See examples in

Figure 4-4 and

Figure 4-6 .

F0: Passenger Car: After selecting the passenger Car, you will be asked to select the 4th digit of the VIN code (the vehicle’s body type). The tester will display all body VIN codes available for the year selected.

Press Y or n to scroll through the list until the desired VIN code flashes. Press e to initialize communication.

F1: Light Truck: After selecting light truck, you will be asked to select the 5th digit on the VIN code (the vehicle’s body type). The tester will display all body VIN codes available for the year selected. Press Y or n to scroll through the list until the desired VIN code flashes. Press e to initialize communication.

0 - 9 y , l n , r e

ACTIVE KEYS

Select model year.

Scroll to the left.

Scroll to the right.

Initialize communications.

Figure 4-4

is an example of possible screen combinations when selecting a passenger vehicle, and

Figure 4-

6

is an example of possible screen combinations when selecting a truck.



FIGURE 4-4. Passenger Car Selection

86

, 87, 88, 89, 90,

91

, 96, 97, 98, 99,

00

, 01, 02, 03, 04

VEHICLE TYPE?

F0: PASSENGER CAR

F1: LIGHT TRUCK

)

SELECT

MODEL YEAR

2004 (4)

U

D

[ENTER]

92

, 93,

94

, 95

VEHICLE TYPE?


F1: U-VAN/APU

F2: LIGHT TRUCK

)

!

Flashing

"B"

SELECT 4TH DIGIT

OF VIN CODE:

(BODY TYPE):

BCDEFHJKLNSVWYZ

y

IS ENGINE TYPE

3.1L? (8TH DIGIT

OF VIN CODE = D)

(YES/NO)

y

All 97 to present Class

2 systems.

*** CAUTION ***

ABS BRAKING IS

NOT AVAILABLE

DURING TESTING

SELECT MODE

F0: ABS DATALIST

F1: CODE HISTORY

F2: TROUBLE CODE

F3: SNAPSHOT

F4: ABS TESTS

SELECT MODE

F0: ABS DATALIST




Adapter and Adapter Cable Configurations 4. Getting Started

FIGURE 4-5. Truck RWAL and 4WAL Selection

88

, 89,

90

, 91

SELECT

MODEL YEAR

2004(4) U D

[ENTER]

96, 97, 98, 99, 00, 01, 02, 03, 04

92

, 93,

94

, 95

VEHICLE TYPE?


F2: LIGHT TRUCK

@

88, 89

VEHICLE TYPE?


F1: U-VAN/APU

F2: LIGHT TRUCK

@

90, 91, 92, 93, 94, 95

VEHICLE TYPE?


F1: LIGHT TRUCK


OF VIN CODE

(BODY TYPE):

CGKLMSTUX

), !, @

(95 Shown)

4WAL SELECT

F0: 4WAL 3-SENSOR

F1: VCM 4WAL

F2: VCM 4WAL OBD2

)

SELECT SYSTEM

F0: RWAL

F1: 4WAL

) ) )

90,

91

92 93

)

94,

95

INSTALL GM 16/12

PIN DLC ADAPTER

P/N 3000053.

[ENTER]

RWAL SELECT

F0: ALL OTHERS

F1: GMT 455

)

, !

RWAL SELECT

F0: VCM RWAL

F1: ZP RWAL

F2: ALL OTHERS

!

, @

)

VOLTAGE CHECK COMMUNICATION CHECK

RWAL SELECT

F0: ZP RWAL

F1: ALL OTHERS

SELECT MODE MENU

ADAPTER AND ADAPTER CABLE

CONFIGURATIONS

This section describes the adapters and other hardware needed for use with the various vehicles covered in the GM Chassis Application Software. The proper Data Link Connector (DLC) adapter, cable and (for Class

2 Network Communications) additional hardware are needed to connect to the vehicles listed in the Vehicle



Application Chart section at the beginning of this chapter. Read the following sections that describe how to select an adapter for use with the vehicle you are testing.

ABS CHASSIS ADAPTERS

Below is a table listing the adapters needed for use with the GM Chassis Application software. Refer to the remainder of this section for appropriate adapter selection and usage.

ADAPTER

GM 12/14 Pin

Adapter

CHASSIS ADAPTERS NEEDED

DESCRIPTION

Used on most GM vehicle 12-pin DLCs prior to 1996

P/N

02001384

ILLUSTRATION

RWAL/4WAL

Adapter

Used on most RWAL/4WAL ABS systems with UART communication protocol

02001579

16/14 Pin OBD

Adapter Cable

Used for vehicles with 16-pin DLC configuration from1994 to present

02001969

Controller Area

Network VIM

16/24 Pin DLC

Adapter Cable

Used for vehicles with 16-pin DLC configuration from 1994 to present

VIM

02003211 or

F-00K-108-115

16/12 Pin Non-

OBD II Adapter

Used for vehicles with the 16-pin DCL configuration specifically designed to be used with RWAL/4WAL Adapter

Cable

02001744

02001575

12/12 Pin Bosch

ABS Adapter

Used on most Bosch ABS systems prior to 1995

02001033

TABLE 4-1. Chassis Adapters Needed


Adapter and Adapter Cable Configurations

NOTE

4. Getting Started

To purchase any Vetronix items mentioned in this manual, please call

(800) 321-4VTX (USA)

GM ELECTRONIC CONTROL UNITS (ECUs)

GM ECUs use two types of serial communication:

• UART (Universal Asynchronous Receive and Transmit)

• Class 2

UART communication is used for all serial communication prior to OBD II (requirement for all automotive manufacturers to reduce emissions). The UART is a 5 volt line that toggles the voltage to ground at a fixed bit pulse width during communications. UART transmits data at the rate of 8.2 kilobits per second (8192 bps). Some control modules on current production GM vehicles for Chassis and Body systems still communicate using the UART protocol.

CLASS 2 was introduced to meet the demanding requirements of OBD II (Selected 1995 and all 1996 to present GM vehicles). The Class 2 data line transfers information by toggling the line from zero volts to 7 volts. Class 2 transmits data at the rate of 10.4 kilobits per second (10.4 Kbps). Class 2 is used for serial communications on all OBD II certified Powertrain and Transmission control modules from 1995 to present

GM vehicles. Class 2 communications is available on some GM Chassis and Body control modules and is increasing as new models are introduced. The communication or “data type” is listed in the

Vehicle

Coverage

tables in this manual.

As a result of this performance improvement, to operate with General Motor’s new and old data link(s),

Vetronix diagnostic test tools are required to contain new hardware.

Refer to Table 4-1 for Vetronix testers and

Table 4-2

for OBD hardware interface.

TESTER

MTS 3100

Tech 1A

Tech 1

NOTE

INTERFACE

OBD II Compliant hardware internal to the tester

OBD II Interface Kit

OBD II Vehicle Interface Kit (VIM)

TABLE 4-2. OBD Hardware Interface

Applications with 16 pin SAE J1962 DLC (OBD II) provide power to the tester; therefore, the 12-volt power cable is not needed for supplying power to the MTS 3100.



16 PIN DATA LINK CONNECTOR (DLC)

Along with the OBD II requirement came the definition of a new 16 pin data link connector (DLC). General

Motors began using this data link connector (DLC) on its vehicles in 1994, even though the vehicle may not have been OBD II compliant. A series of new 16 pin DLC adapter(s) were developed to connect all GM vehicles, whether they are OBD II compliant or not, to the Tech 1/1A and MTS 3100 testers.

NOTE

In all cases of determining which adapter or adapter combination to use,

please reference the

Vehicle Coverage

tables and the

Chassis Adapter

Usage Table

.

SELECTING THE CORRECT ADAPTER

First, look up the vehicle you are testing in the Vehicle Application Charts provided in the beginning of this chapter. You need to know the VIN number that identifies the body of the vehicle you are working on. The

4th digit of the VIN identifies the body type for passenger cars and the 5th digit for light trucks (refer to

Vehicle Identification Number (VIN) on page 108

).

Once you have located the vehicle in the Application Charts, look in the column marked “ADAPTER

CONFIG” and note the listing (see below).

EXAMPLE (from the Vehicle Application Chart)

Next, look in

Figure 4-3, Chassis Adapter Usage, on page 85

for the adapter configuration number of the vehicle you are connecting to. In the case of the example listed above, the 1997 Bonneville Adapter

Configuration number is OBD II-C or GM-16. The Chassis Adapter Usage Chart on the following page provides listings of the adapters, cables and other hardware needed to connect each Vetronix tester to the vehicle.

In this

Example (from Table 4-3)

, assume you are using the MTS 3100. The following adapters or cables would be needed for the OBD II or GM-16:

OBD II-C

• OBD II-C VIM and Adapter Cable, Part Nos. 02003211 and 02001744

• An OBD II Compliant MTS 3100 or

GM-16

• GM 12/14 Pin Adapter, Part No. 02001384

• 16/12 Pin Non-OBD II Adapter, Part No. 02001575



Example (from Table 4-3

)

SYSTEM

OBD II / Class 2

ABS Systems

16-pin DLC

ADAPTER

CONFIG

OBD II-C

OBD II

TESTER

MTS 3100

Tech 1A

16-pin DLC with

Non-OBD II Systems

Non Class 2

GM-16

Tech 1

MTS 3100

Tech 1A

Tech 1

ADAPTER

DESCRIPTION

Controller Area Network VIM

16/24 Pin DLC Adapter Cable

OBD II Interface Cartridge

16/14 Pin OBD II Type 3

Adapter Cable

OBD II-VIM

16/14 Pin VIM Adapter Cable

OBD II-VIM

Tech 1 16/24 Pin VIM Adapter

Cable

Tech 1 14/12 Pin VIM DLC

Adapter

GM 12/14 Pin Adapter

16/12 Pin Non-OBD II Adapter




PART

NO.

02003211

02001744

02002178

02001744

FIG

NO

4-16

4-17

02001808

02001744

02001808

02001744

02001198

4-18

4-19

02001384

02001575

02001384

02001575

4-21

4-21

02001575

4-22

For an illustration of the adapters and how to connect them to the tester, refer to the “FIG. NO.” listing in

the last column of the

Chassis Adapter Usage Table

.



CHASSIS ADAPTER USAGE TABLE

Use Table 4-3 in conjunction with the Vehicle Application Charts listed in the beginning of this chapter. The

illustrations referenced under “FIG. NO.” can be found after

Table 4-3

.

SYSTEM

Delco ABS Systems with a 12-pin DLC

RWAL/4WAL ABS

Systems

12-pin DLC

RWAL/4WAL

ABS Systems with

16-pin DLC and

Non-OBD II

Non Class 2

All 1994 and newer with 16-pin DLC

(OBD II)

ABS Systems with

16-pin DLC

ADAPTE

R

CONFIG

GM

TESTER

ADAPTER

DESCRIPTION

GM-R

GM-16R

OBD II-C b

OBD II

b

MTS 3100

Tech 1A

Tech 1

MTS 3100

Tech 1A

Tech 1 a

MTS 3100

Tech 1A

Tech 1

a

OBD II-C2 MTS 3100

MTS 3100

Tech 1A

Tech 1



Tech 1 GM RWAL/RWAL

ALDL Cable


RWAL/4WAL Adapter


RWAL/4WAL Adapter

RWAL/4WAL ALDL Cable

RWAL/4WAL Adapter


RWAL/4WAL Adapter

16/12 Pin Non-OBD II

Adapter


RWAL/4WAL Adapter


Adapter


RWAL/4WAL Adapter


Adapter

Controller Area Network

VIM

16/24 Pin DLC Adapter

Cable


VIM

16/24 Pin DLC Adapter

Cable


16/14 Pin OBD II Type 3

Adapter Cable

OBD II-VIM

16/14 Pin VIM Adapter

Cable

OBD II-VIM

Tech 1 16/24 Pin VIM

Adapter Cable

Tech 1 14/12 Pin VIM DLC

Adapter

TABLE 4-3. Chassis Adapter Usage

02002178

02001744

Figure 4-17

02001808

02001744

Figure 4-18

02001808

02001744

02001198

Figure 4-19

PART

NO.

FIG NO.

02001384

Figure 4-6

02001384

Figure 4-7

02001578

Figure 4-8

02001384

02001579

02001384

02001579

02001578

02001579

02001384

02001579

02001575

Figure 4-9

Figure 4-10

Figure 4-11

Figure 4-12

02001384

02001579

02001575

Figure 4-13

02001384

02001579

02001575

Figure 4-14

F-00K-

108-115

02001744

Figure 4-15

02003211

02001744

Figure 4-16



SYSTEM

ADAPTE

R

CONFIG

GM-16

TESTER

ADAPTER

DESCRIPTION

PART

NO.

FIG NO.

16-pin DLC with

Non-OBD II Systems

Non Class 2

Bosch GM-B

MTS 3100

Tech 1A

Tech 1

MTS 3100

Tech 1A

Tech 1



Adapter



Adapter


Adapter


12/12 Pin Bosch ABS

Adapter


12/12 Pin Bosch ABS

Adapter

12/12 Pin Bosch ABS

Adapter

02001384

02001575

02001384

02001575

02001384

02001033

02001384

02001033

Figure 4-21

Figure 4-21

02001575

Figure 4-22

Figure 4-23

Figure 4-24

02001033

Figure 4-25

TABLE 4-3. Chassis Adapter Usage a. Tech 1 RWAL/4WAL cable can be used with all other applications in place of the 02001578 Tech 1 ALDL cable.

b. OBD II and OBD II-C are early adapter cable configurations utilized by the tester to communicate with systems connected to the OBD II DLC. If you have one of these configurations, please reference OBD II-C2 in the Adapter Config. column of the vehicle coverage tables for the vehicle you are diagnosing.



FIGURE 4-6. GM Adapter Configuration for MTS 3100

4. Getting Started

MTS 3100

DLC Cable

GM Chassis Application 1986-2004

DC Power Cable

GM 12/14-Pin Adapter

Page 87


FIGURE 4-7. GM Adapter Configuration for Tech 1A

4. Getting Started

DLC Cable

Tech 1A

Application Cartridge

DC Power Cable

GM 12/14-Pin Adapter



FIGURE 4-8. GM Adapter Configuration for Tech 1

RWAL/4WAL ALDL Cable

Tech 1


DC Power Cable



FIGURE 4-9. GM-R Adapter Configuration for MTS 3100

4. Getting Started

MTS 3100

DLC Cable

DC Power Cable



RWAL/4WAL Adapter

Page 90


FIGURE 4-10. GM-R Adapter Configuration for Tech 1A

4. Getting Started

Tech 1A

DLC Cable


DC Power Cable


RWAL/4WAL Adapter



FIGURE 4-11. GM-R Adapter Configuration for Tech 1

4. Getting Started

Tech 1

RWAL/4WAL

ALDL Cable


RWAL/4WAL Adapter



FIGURE 4-12. GM-16R Adapter Configuration for MTS 3100

4. Getting Started

MTS 3100

DC Power

Cable

DLC Cable



RWAL/4WAL Adapter

GM 16/12 Pin Non-OBD II Adapter

Page 93


FIGURE 4-13. GM-16R Adapter Configuration for Tech 1A

4. Getting Started

DLC Cable

Tech 1A

DC Power Cable




RWAL/4WAL Adapter

GM 16/12 Pin

Non-OBD II Adapter

Page 94


FIGURE 4-14. GM-16R Adapter Configuration for Tech 1

4. Getting Started

RWAL/4WAL

ALDL Cable

Tech 1


RWAL/4WAL Adapter

GM 16/12 Pin Non-OBD II Adapter



FIGURE 4-15. OBD II-C2 Adapter Configuration for MTS 3100


4. Getting Started

MTS 3100

(OBD II-Compliant)


(P/N F-00K-108-115)


(P/N 02001744)


DLC Cable

Page 96


FIGURE 4-16. OBD II-C Adapter Configuration for MTS 3100


4. Getting Started

MTS 3100

(OBD II-Compliant)


(P/N 02003211)



DLC Cable

Page 97


FIGURE 4-17. OBD II Adapter Configuration for Tech 1A

4. Getting Started


Tech 1A

DLC Cable


16/14 Pin Type 3 Adapter Cable



FIGURE 4-18. OBD II Adapter Configuration for Tech 1A

4. Getting Started

DLC Cable

Tech 1A


OBD II Vehicle Interface

Module (VIM)


16/24-Pin VIM Adapter Cable

Page 99


FIGURE 4-19. OBD II Adapter Configuration for Tech 1

4. Getting Started

14/15 Pin DLC Cable

Tech 1

RWAL/4WAL

ALDL Cable

Application

Cartridge or MSC

Tech 1

14/12 Pin

VIM Adapter

OBD II Vehicle Interface Module (VIM)

16/24 Pin VIM Adapter Cable



FIGURE 4-20. GM-16 Adapter Configuration for MTS 3100

4. Getting Started

MTS 3100

DLC Cable

DC Power Cable





FIGURE 4-21. GM-16 Adapter Configuration for Tech 1A

4. Getting Started

Tech 1A

DLC Cable


DC Power Cable





FIGURE 4-22. GM-16 Adapter Configuration for Tech 1

Tech 1

RWAL/4WAL

ALDL Cable

4. Getting Started



Adapter



FIGURE 4-23. GM-B Adapter Configuration for MTS 3100

4. Getting Started

MTS 3100

DLC Cable

DC Power Cable


BOSCH ABS Adapter



FIGURE 4-24. GM-B Adapter Configuration for Tech 1A

4. Getting Started

DLC Cable

Tech 1A

DC Power Cable



BOSCH ABS Adapter



FIGURE 4-25. GM-B Adapter Configuration for Tech 1

4. Getting Started

RWAL/4WAL

ALDL Cable

Tech 1


BOSCH ABS Adapter


Using the Tester Keypad and Menus 4. Getting Started

USING THE TESTER KEYPAD AND MENUS

The operation of the tester software is simple, so once you’ve read through the manual to get a general idea of how it operates, you won’t have to refer to it very often. You simply sequence through the operation of the cartridge by pressing keys on the tester in response to messages displayed on the tester. In general, this sequencing is performed by pressing “function keys” () - () to select items from “menus” displayed on the tester. Refer to the table below for a summary of the basic key functions. Each section in this manual contains a table indicating which keys are active for that mode of operation.

Y

, N

X u

, d

0

- 9

)

- ( e

GENERAL TESTER KEY FUNCTIONS

Answer questions asked by the tester and scroll through data parameters.

Terminate operating modes and return to previous menu.

Used to control data display or to turn outputs ON or OFF.

Numeric keys used for entering trouble code designations.

Function keys used to select from functions displayed on a menu.

Used at end of a numeric key sequence or to inform tester that a requested action has been completed.


Vehicle Identification Number (VIN) 4. Getting Started

VEHICLE IDENTIFICATION NUMBER (VIN)

If you are in doubt about the type of vehicle you are testing, refer to the Vehicle Identification Number

(VIN). Use the chart below to assist in interpreting the VIN of the vehicle being tested.

BODY/CHASSIS TYPE FOR

LIGHT DUTY TRUCKS AND

APV’S (5th DIGIT)

TYPICAL VIN

VIN CHARACTER

1 G 4 W D 1 1 T X L 7 1 6 0 7 9 1

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

VEHICLE MAKE

(3rd DIGIT)

1 Chevrolet

2 Pontiac

3 Oldsmobile

4 Buick

6 Cadillac

7 GM of Canada

8 Saturn

BODY

TYPE

(4th DIGIT;

Passenger

Cars Only)

ENGINE

CODE

(8th DIGIT)

BODY FOR

MEDIUM DUTY

TRUCKS (6th DIGIT)

MODEL YEAR

(10th DIGIT)

G = 1986

H = 1987

J = 1988

K = 1989

L = 1990

M = 1991

N = 1992

P = 1993

R = 1994

S = 1995

T = 1996

V = 1997

W = 1998

X = 1999

Y = 2000

1 = 2001

2 = 2002

3 = 2003

4 = 2004


5. SELECTING AND OPERATING

TEST MODES

This chapter provides a detailed description of each test available in this application. Following the test descriptions, step-by-step instructions tell you how to quickly perform the test. A list of the active keys for each test is included at the end of each test mode.

TEST MODES SUMMARY

The following table gives you a quick summary of the test modes available within this application. Detailed descriptions of the test modes are given in the appropriate sections of this chapter. The tester only displays the test modes that are applicable to the vehicle being tested.

MODE

F0: Data List

F2: DTCs

F3: Snapshot

F4: OBD Controls

F4: Misc. Tests

F8: Information

SUBMODE

F0: Current DTCs

F1: History DTCs

F2: Clear DTCs

DESCRIPTION

Displays Sensors and Input/Output data about the current condition of the chassis system under test. Examples include Wheel Speed sensor data, Vehicle Speed, and Brake Switch status.

Displays Diagnostic Trouble Codes recorded by the ECU. The ability to Clear DTC information is also found in this mode.

F3: ECU Info

F4: Vehicle Info

Gives you the ability to capture Data List information for later analysis. Trigger point and trigger type are selectable by the user.

Provides the ability for bi-directional control of a component or device ON and OFF, reset memory values, or write to vehicle memory. Examples include Solenoid Tests, Auto Bleed, Tire Size

Re-calibration, Motor Test, Lamp Test, ASR Test, and Pilot Valve

Test.

Displays helpful information about the vehicle or systems under test.

This can consist of Calibration ID, Module ID, and VIN (Vehicle

Identification Number).


Selecting the Test Modes 5. Selecting and Operating Test Modes

SELECTING THE TEST MODES

After selecting the model year and body type, the tester either displays a SELECT SYSTEM screen for more specific vehicle information input or displays a SELECT MODE screen for access to the ABS and

Chassis functions available to the vehicle selected. Each ABS system requires specific input and the tester provides display screens for inputting the information needed for that vehicle application.

Since all of the test modes or system selections cannot be displayed on the tester at the same time, the tester automatically sequences between all pages of the menu. To stop the automatic scrolling, press the U or D key. The menu may then be scrolled manually with the U and D keys.

Below shows the keys that are active on the tester when selecting an item from either the SELECT

SYSTEM or SELECT MODE tester screens. d u

0 9 x

ACTIVE KEYS

Stop the automatic menu scrolling, then sequence to the previous page of the menu.

Stop the automatic scrolling, then sequence to next page of menu.

Select Test Mode.

Return to vehicle selection.

Once you have selected the test mode, operation begins. Detailed operating descriptions for each test mode are provided in this section and listed according to the ABS or chassis system being tested.

Please note that not all test modes are available for the various ABS systems.


Mode F0: Data List 5. Selecting and Operating Test Modes

COMMON TEST MODES

The Common Test Mode section contains information about Common Tests that apply to most ABS systems.

The Common Tests all have the same active tester keys and menu layout for most ABS systems.

The following modes apply to the Common Test Mode section:

• Data List

• DTCs

• Snapshot

• Information

Additional information may be available for the ABS system you are working on. Refer to the specific ABS system.

MODE F0: DATA LIST

The purpose of DATA LIST mode is to continuously monitor diagnostic data parameters for all supported chassis systems.

The tester displays data parameters in pairs. You can view the data pairs as displayed when entering Data

List or create your own display pairs. See

Create Your Own Data Pairs on page 112.

.

The tester display tells you in plain English which parameters are being monitored. The current value of the parameter is displayed with the parameter units. This means you don’t have to hunt through manuals to

determine what is being displayed. Appendix C contains a description of a sample of Data List parameters

for ABS Systems.

To select Data List, do the following:

1. Press ) to select DATA LIST mode from the Select Mode menu.

2. Select the data parameters to be displayed by scrolling through the parameters with the Y and N keys. If you hold either key down, the tester scrolls through all of the parameter pairs in sequence.

3. Pressing * while in the DATA LIST mode allows one sample of all data parameters to be printed if connected to a VP-411, VP-414, or Tech 1 printer.

NOTE

If using a Tech 1, the RS232 cartridge and serial printer must be connected to the tester when the * key is pressed.

4. If communication with the component being tested is lost, the tester informs you. The tester attempts to reestablish communications. If the attempt is successful, the tester returns to the Data List display. If after five seconds there is still no communication, the tester displays messages indicating the cause of the fault.



If you are testing a Bosch system, a wait timer of up to 40 seconds is displayed if there is no communication.

5. Press X to return to the SELECT MODE menu.

More Data Parameters

N

Y

REAR RELEASE SOL

OFF

REAR REL SOL FB

LOW

N Y

SELECT MODE

F0: DATA LIST



FRONT WHL SPEEDS

55 MPH 56 MPH

REAR WHL SPEEDS

55 MPH 56 MPH

N Y

VEHICLE SPEED

55 MPH

ABS BATT VOLTAGE

OK FOR OPER.

N

Y


FIGURE 5-1. Selecting Data List Parameters

CREATE YOUR OWN DATA PAIRS

You can create data parameter pairs different from the pre-programmed pairs. Any two parameters from the current data list can be made into a pair.

New data pairs are created by simply scrolling either the top or bottom display parameter, while the other display parameter is fixed. Pressing ) causes the top display parameter to be fixed, which is indicated

with an “*” in the left column of the second line of the display, as shown in Figure 5-2

. Pressing ! causes the bottom display parameter to be fixed, as shown in

Figure 5-2 . To “unfix” the top parameter, press !.

Press ) to “unfix” the lower parameter. The tester won’t allow both the top and bottom parameters to be fixed at the same time.

As an example, let’s say you wish to create a pair with FRONT WHEEL SPEED and VEHICLE SPEED.

To do so, scroll through the pre-programmed pairs with the Y or N key until you find a pair with

FRONT WHEEL SPEED. Fix FRONT WHEEL SPEED by pressing ) since it is the top parameter. Then scroll the other half of the display with the Y key until VEHICLE SPEED is displayed.


Mode F2: DTC(s) 5. Selecting and Operating Test Modes

* FIXES TOP

PARAMETER

* FIXES BOTTOM

PARAMETER


* 55 MPH 55 MPH

REAR WHL SPEEDS

55 MPH 55 MPH

FRT ENABLE RELAY

ON

REAR ENABL RELAY

* ON

FIGURE 5-2. Data Pair Display Parameters

DATA LIST PARAMETERS

Appendix C

of this manual lists some examples of the parameters which can be displayed in the DATA

LIST mode, along with their units, for some of the systems which can be tested. Some of the parameters are discrete parameters (they can only have two values), and their units are the descriptors for the states they can have. For example, the REAR ENABLE RELAY is either ON or OFF. y , n

)

!

&

* e

ACTIVE KEYS

Scroll through displayed data parameters.

Mark the top display parameters as “fixed” for creating your own pairs.

Mark the bottom display parameter as “fixed” for creating your pairs.

Toggle between English and Metric units (MPH vs KPH).

Output DATA LIST parameters to a printer (If using the Tech 1, the RS232C I/F Cartridge must be installed).

Return to Select Mode menu.

MODE F2: DTC(S)

For 1993 and later vehicles, Trouble Codes are referred to as Diagnostic Trouble Codes (DTCs).

Trouble codes or Diagnostic Trouble Codes (the two terms have the same meaning in this manual) are set when an abnormal condition is detected. They are the keys to diagnosing many of the problems which can occur in the vehicle. Therefore, you should look to see if any trouble codes are set at the beginning of every diagnostic session.

You can use the DTCs mode to display trouble codes which have been set by the vehicle. You can also use the DTCs mode to clear the codes after the codes have been displayed.



To display Trouble Codes, do the following:

1. Verify that the ignition is in the “ON” position.

2. Select DTCs mode by pressing @.

3. If the vehicle’s ABS fails to respond to the tester within 6 seconds (or within approximately 45 seconds for Bosch ABS), the tester displays:

TROUBLE CODES

NO DATA RECEIVED

FROM ABS ECU

Under these conditions you should:

• Cycle power on the tester.

• Cycle the vehicle’s ignition and leave it in the ON position.

• Verify that the vehicle contains an ABS system.

• Check the connection to the DLC.

If this message persists, you should check for a shorted serial data link or a faulty ABS ECU. If you are testing a Bosch ABS system, also look for a shorted or open diagnostic enable circuit (pin H on the DLC cable). With Delco ABS VI systems this can happen if power or ground is not available to the ABS controller. Refer to the Diagnostic Circuit Check in the service manual.

4. Once data has been received, the tester displays each code for 3 seconds. You can freeze the display by pressing the d key. Pressing u causes the tester to sequence to the next code. Refer to the Service

Manual for a description of the trouble codes.

5. Most ABS ECUs provide information identifying codes as either current or history codes.

• A current code is a fault which is currently present in the vehicle during this ignition cycle.

• A history code refers to a fault which occurred during a previous cycle. The tester distinguishes between current and history ABS codes by displaying “C” or “H” after the code number.

6. Some ECUs provide additional History Code information that displays the most likely cause of the code.

This information is displayed immediately after the ABS code display has been completed.

C1211 HISTORY

ABS WARNING

LAMP CIRCUIT

MALFUNCTION

Code Clearing

7. After all trouble codes and ABS fault isolation messages have been displayed, the tester prompts you to

“CLEAR ABS CODES”. If you press N, the software returns to the Select Mode menu.

C1211 HISTORY

ABS WARNING LAMP

CIRCUIT MALFUNCTION

8. To go to the Select Menu, press Y to clear the trouble codes. If the codes are successfully cleared, the tester displays “ABS CODES CLR’D”, then returns to the test selection menu. At this time you should cycle the ignition.



9. If you press Y, the following message displayed on the tester:

HISTORY DATA

WILL BE LOST.

CLEAR CODES?

(YES / NO)

This gives you the opportunity to examine more information which the ABS controller has saved about the ABS trouble codes. Press N if you do not want to clear the codes. Pressing Y causes ABS codes to be cleared. Press X to return to the Select Mode menu.

10. If the “CODE CLEAR FAIL” message is displayed, re-enter the DTCs mode and try to clear codes again. If it fails again, then you probably have an intermittent connection to the serial data link (SDL). It is also possible that the controller is malfunctioning.



SELECT MODE

F0: DATA LIST



@

TROUBLE CODES

WAITING FOR DATA

X

Approximately

2 Seconds

X

TROUBLE CODES

ABS CODE A007 C

REAR RELAY CNTCS

OPEN, FUSE OPEN

3 Seconds

X

TROUBLE CODES

ABS CODE A048 H

RF WHEEL SPEED

JITTER TEST

3 Seconds

TROUBLE CODES

CLEAR CODES?

Y

X

N

INDICATES

CURRENT CODE

INDICATES

HISTORY CODE

HISTORY DATA

WILL BE LOST

CLEAR CODES?

(YES/NO)

Y

CURRENT

MALFUNCTION(S)

EXIST. UNABLE TO

CLEAR DTC(S)

DTC’S CLEARED

FIGURE 5-3. Example of Mode F2: Trouble Code/DTC(s) Display and Clearing

X y , n d u x

ACTIVE KEYS

Determine whether codes should be cleared or not.

Freeze the display of the latest trouble code.

Display the next trouble code.

Terminate trouble code display.


Mode F3: Snapshot 5. Selecting and Operating Test Modes

MODE F3: SNAPSHOT

The purpose of the snapshot test mode is to help you isolate an intermittent or transient problem by storing data parameters before and/or after the problem occurs. The snapshot data can then be analyzed to determine the cause of the customer complaint.

When the tester is operating in snapshot mode, it is constantly storing information about data parameters and trouble codes. A time and position index for the stored information is also saved. When the memory is full, the oldest (earliest) data collected is erased to make room for new information.

NOTE

Snapshot functions mentioned in this section may not be available for all

ABS vehicle applications.

A trigger tells the tester when to stop collecting data. You can specify a trigger condition so the tester collects data that is most useful in diagnosing the current problem. You can also select the location of the trigger point.

TRIGGER POINT

The Trigger Point menu allows you to specify which data to capture—data that occurs before and/or after the point at which the trigger occurs. If no trigger point is selected, the center trigger point is used and a similar number of data samples before and after the trigger is saved.

TRIGGER CONDITION

The trigger condition defines the specific circumstances under which you want the trigger to occur. The possible trigger conditions are:

NOTE

Trigger selections mentioned below may not be available for all ABS applications.

• MANUAL TRIGGER: While operating the snapshot mode, you can always cause the trigger to occur by pressing the (, E or X keys.

• AUTOMATIC TRIGGER: This trigger condition is not available for Kelsey-Hayes 4WAL systems.

The tester examines the ABS data and triggers the snapshot if an abnormal condition occurs. The ABS automatic trigger feature is intended to identify deviations in data or input signals that may not set an

ABS code. If an automatic trigger condition is encountered, it may provide information to support customer complaints of irregular ABS performance or intermittent ABS warning lights. The automatic trigger occurs if one of the following conditions exists:

• A sudden change in speed of one wheel. Be sure you are driving at a constant speed on a clean, dry, smooth surface when a trigger occurs. Spinning the tires, locking the wheels while braking, driving through pot holes, or performing ABS stops causes a trigger that is NOT identifying a system problem.

• Very short pump run intervals that should also cause a code A062 (Delco Moraine ABS III).



• Very short loss of brake switch intervals, that may not set a code, but causes a momentary loss of

ABS (Delco Moraine ABS III, Delco ABS VI, and Bosch).

• A very short loss of brake switch circuit input that may not set a code, but causes a momentary loss of

ABS (Delco Moraine ABS III and Delco ABS VI).

• Detection of low pressure (Delco Moraine ABS III).

• Low brake fluid (Bosch).

• If the red brake telltale turns on (Delco ABS VI).

• Lateral accelerometer fault (Bosch).

• If the battery voltage falls below 11.0 volts or goes above 16 volts (Delco ABS VI and Bosch).

• Sudden change in engine RPM (Bosch).

• Engine torque out of range (Bosch).

• Loss of Data.

• Valve solenoid relay off or < 2 volts (Bosch).

The intent of the ABS automatic trigger feature is to identify short duration intermittent problems. For this reason, the data is taken at a high rate of speed: approximately every 1/20th of a second.

• ANY CODE: Any trouble code detected causes the trigger.

• SINGLE CODE: You can select a specific trouble code that must be detected before the trigger is set.

Step 3 in the operating procedure tells you how to enter the code.

• If you select the SOFT FAULT option, the tester triggers when the ECU recognizes an intermittent fault. A soft fault is an occurrence such as a loose wire, which breaks and makes contact when driving over a rough road. This option is only available for Kelsey-Hayes 4WAL (UART) systems.

• If you select the ABS STOP option, the tester triggers when the brake, while driving, is applied hard enough to cause the Kelsey-Hayes 4WAL (UART) system to activate. This option is only available for

Kelsey-Hayes 4WAL (UART) systems.

Once the trigger occurs, the tester retains data according to which trigger point you have selected.

VIEWING CAPTURED DATA

You have the option of bypassing the Data Capture phase and displaying previously captured data by selecting F0: REPLAY DATA from the SNAPSHOT menu. All data captured during snapshot is retained in the tester until it is overwritten by a new snapshot, or if the tester is unplugged from the cigarette lighter for more than 24 hours.

If no data has been captured, or if data stored in the tester memory is not data from the vehicle currently being tested (i.e., it’s from a previously tested vehicle), tester displays the following message for four seconds (or until the u or X key is pressed):

CAPTURED DATA

NOT FROM

SELECTED

VEHICLE.



PRINTING CAPTURED DATA

In addition, the GM Chassis Software has the capability to print the captured data, providing a hard copy of any selected data sample. If you are using a Tech 1, the tester RS232C I/F Cartridge (P/N 01001151) and a tester printer (P/N 01001419 or compatible) is required to support this print function.

If you are using the MTS 3100 or Tech 1A, a VP-411, VP-414 or equivalent is needed to print Snapshot data.

SELECTING SNAPSHOT MODE

The operation of snapshot mode is divided into three phases:

• Setup (beginning with Step 1 )

• Data Capture ( Step 5 through Step 8 )

• Data Display (

Step 9

to the end)

To select Setup phase of Snapshot Mode, do the following:

1. Select the snapshot mode from the Select Mode menu by pressing #.

2. The trigger condition and review data options are displayed next in a self-scrolling Snapshot Mode menu. To select a trigger option, just press the function key displayed to the left of the desired trigger condition. To replay previously captured data, press ).

3. With the Delco Moraine ABS III and Delco ABS VI systems, you can choose a specific ABS trouble code for the trigger condition as explained below.

When the tester screen displays “SNAPSHOT MODE, ENTER ABS CODE A0??”, use numeric keys

0

- 9 to enter the two digit trouble code number that you have selected, then press E. The tester continues to store data until the specified trouble code is detected, or until you press the (,

E

, or X key. If the code you enter does not exist for the vehicle being tested, an “INVALID

CODE” message is displayed and the code has to be reentered.

4. In addition to offering a trigger condition selection, this cartridge offers the option of selecting a trigger point. If you select F9: TRIG. POINT from the SNAPSHOT OPTION menu, the following options is displayed: F0: BEGINNING, F1: CENTER, and F2: END.

• F0: BEGINNING

The trigger is at the beginning of the captured data. After the trigger occurs, the tester continues to capture data until the memory is full, then the data is displayed. If not enough data samples have been collected to fill the tester memory (because the X key was pressed before the tester memory was full), fewer than the maximum number of samples are saved.

• F1: CENTER

If enough time has elapsed before and after the trigger point, a similar number of data samples that occurred before and after the trigger point is available for display. However, if the trigger occurs at or near the start of the Data Capture phase, there are fewer samples before the trigger point available for display. Also, if the X key is pressed after the trigger occurs, but before the tester memory is full, fewer data samples captured after the trigger point are available for display.

• F2: END

Data that occurred before the trigger is displayed.



)

!

@

#

$

%

^

(

0

-

9

E

X

ACTIVE KEYS IN THE SET-UP PHASE

Replay previously captured data.

Select the manual trigger mode.

Select the automatic trigger mode.

Select the trigger on any code mode.

Select the trigger on specified code.

Select Soft fault option (4WAL/UART systems only).

Select ABS Stop option (4WAL/UART systems only).

Select Trigger Point.

Select specific trouble code.

Enter selected trouble code.

Terminate SNAPSHOT mode, return to Select Mode menu.



MULTIPLE DATA LISTS

Some vehicles provide multiple data lists available in the snapshot function. Figure 5-4 provides an example

of setting up a snapshot when multiple data lists are available.

1997 CHEVROLET CAMARO (F)

EXAMPLE

SELECT MODE

F0: DATA LIST

F1: DTC HISTORY

F2: DTC(S)

F3: SNAPSHOT

F4: MISC. TESTS

F6: BLEED PREP.

#

SELECT SNAPSHOT

F0: ABS

F1: TCS

ABS and TCS Data

Lists are available for

Snapshot.

1997 BUICK REGAL (W)

EXAMPLE

SELECT MODE

F0: Datalist

F2: DTC Info

F3: Snapshot

#

SNAPSHOT OPTIONS

F1: Any DTC

F2: Manual Trig.

F3: Replay Data

@


F0: REPLAY DATA

F1: MANUAL TRIG.

F2: AUTO TRIG.

PRESS ENTER,

EXIT, OR F9

TO TRIGGER.

3 Seconds

Select a Data List to perform a Manual

Trigger Snapshot.

SELECT DATALIST

F0: Module Info

F2: ABS Data

F2: TCS Data

@

LF

RF

Wheel Speed

51 MPH

Wheel Speed

51 MPH

FIGURE 5-4. Example of Snapshot with Multiple Data Lists



SNAPSHOT SET-UP PHASE

To select a trigger condition, press the function key to the left of the desired trigger condition. To bypass the

Data Capture phase and review previously captured data, press ): REPLAY DATA. F5: SOFT FAULT and F6: ABS STOP are only available for 4WAL systems.

SET-UP

PHASE

SELECT MODE

F0: DATA LIST



F3: SNAPSHOT

F4: ABS TESTS

#

IF BOSCH ABS/TCS V-BODY


F0: DIAGNOSTIC

F1: NORMAL MODE

REPLAY PREVIOUSLY

CAPTURED DATA


55 MPH 56 MPH

REAR WHL SPEEDS

55 MPH 56 0

)

,


F0: REPLAY DATA

F1: MANUAL TRIG

F2: AUTO. TRIG.

F3: ANY CODE

F4: SINGLE CODE

F5: SOFT FAULT

F6: ABS STOP

F9: TRIG. POINT

$

)

SELECT TRIGGER POINT

TRIGGER POINT AT

F0: BEGINNING

F1: CENTER or

F2: END of data.

,

DATA

CAPTURE

PHASE

Code, then

E


55 MPH 56 MPH

REAR WHL SPEEDS

55 MPH 56 W

N

Y


FIGURE 5-5. Snapshot Set-up Phase

SNAPSHOT MODE

ENTER ABS CODE:

A0??

FLASHING "W"



To select Data Capture phase, do the following:

5. Once the trigger condition is specified, the tester begins storing data parameters and trouble codes while displaying the Data List parameters. Trouble codes for some systems are also stored and can be displayed in the Data Display phase.

6. The data is organized as a number of data samples. The value or state of each parameter as well as all trouble codes are saved for each sample. The data display indicates the waiting for trigger condition with a flashing “W” in the lower right-hand corner of the display. While waiting for the selected trigger, the

(

, X, or E keys can always be used to force a trigger.

The number of samples saved by the tester is a function of the system being tested. Normally, the trigger point occurs in the center of the data and half of the samples are before the trigger and half are after. If you selected a different trigger point during set-up (using the ( function), the trigger point (sample 0) is near the beginning or end of the samples.

7. Once the trigger occurs, the tester continues to save data samples until its memory is full. The data display indicates that the trigger has occurred by replacing the flashing “W” with a fixed “T”. As soon as the memory is full, the data capture terminates automatically.

After the data capture terminates, the tester briefly displays the cause of the trigger. This display can also be seen by pressing # in the Data Display Phase (

Step 12 ). RWAL/4WAL systems do not display the

cause of trigger.

8. Pressing X after the trigger has occurred terminates the Snapshot Data Capture phase early, and the

SNAPSHOT mode moves to the Data Display phase.


55 MPH 56 MPH

REAR WHL SPEEDS

55 MPH 56 W

Waiting for Trigger

(


43 MPH 42 MPH

REAR WHL SPEEDS

42 MPH 42 T

Trigger Occurs

SNAPSHOT TRIGGER

OCCURED ON:

MANUAL KEY

PRESS

Trigger Occured On

FIGURE 5-6. Snapshot Data Capture Phase


41 MPH 41 MPH

REAR WHL SPEEDS

40 MPH 40 0

Display Data Phase

Y , N

)

!

&

( e x

SNAPSHOT DATA CAPTURE ACTIVE KEYS


Mark top displayed parameter as “fixed” for creating your own data pairs.

Mark bottom displayed parameter as “fixed” for creating your own data pairs.

Toggle between MPH and KPH display.

Manual trigger.

Manual trigger.

Manual trigger, or Display captured data if trigger has already occurred.



To select Snapshot Data Display phase, do the following:

9. The Data Display phase is indicated with a number (initially zero) in the lower right hand corner of the display. Select the data to be displayed by using the Y and N keys.

10. Delco Moraine ABS III and Delco ABS VI systems only: The “current” trouble codes present during each sample can be displayed by pressing @. The trouble codes automatically scroll once, then the display returns to the Data Display list. A “C” at the end of line two in the trouble code display indicates the code is a current code. History codes are not read during SNAPSHOT mode.

This function is not available with the Bosch ABS due to the fact that for this system, trouble codes cannot be set during diagnostics.

The trouble code display can be “frozen” by pressing the d key, then “unfrozen” by pressing the u key.

11. Use the u and d keys to select the desired sample. An index is displayed in the lower right-hand corner of the tester display. Sample “0” corresponds to the trigger sample; sample “-1” is the sample immediately preceding the trigger; sample “+1” is immediately after the trigger, and so on. The index range may be less than the maximum number of samples if not enough time was allowed for data capture before or after the trigger.

You can advance directly to the first, last, or trigger sample with the press of a button.

F4: Display first (earliest) sample

F5: Display trigger sample (0)

F6: Display last (most recent) sample

12. Pressing # allows you to determine what caused the SNAPSHOT trigger to occur. For example, if you selected the Automatic Trigger option, pressing # might result in the following display:


OCCURED ON:

INTERMITTENT

WHEEL SPEED



More Data Samples before the trigger

U

D


55 MPH 55 MPH

REAR WHL SPEEDS

55 MPH 55 –1

U

Data Sample that occurred just before the trigger occurred

More Data Samples

U D


55 MPH 56 MPH

REAR WHL SPEEDS

56 MPH 56 0

U

D

Y

N

VEHICLE SPEED

55 MPH


OK FOR OPE 0

Y

N

U D

More Data

Parameters


56 MPH 56 MPH

REAR WHL SPEEDS

56 MPH 56 +1

More Data Samples

Trigger

Position

U D

Data Sample that occurred just after the trigger occurred

More Data Samples after the trigger

FIGURE 5-7. Snapshot Data Display Phase

13. While in the data display phase, pressing E causes the tester to toggle between the sample index and sample time.

SAMPLE

INDEX


55 MPH 55

REAR WHL SPEEDS

55 MPH 55 +84

e


55 MPH 55

REAR WHL SPEEDS

55 MPH +8.74

e

SAMPLE

TIME

The sample time display gives the time in seconds (relative to the trigger sample) at which the tester received the currently displayed sample. For example, a sample time of +8.74 means the sample was received 8.74 seconds after the trigger sample. A sample time of -2.71 seconds means the sample was received 2.71 seconds before the trigger.



14. The current sample displayed may be printed if the tester is connected to a printer. To print the data, press *. The tester keyboard is disabled while printing the data.

SNAPSHOT data can also be printed in a tabular format using the tester’s SCREEN PRINT feature. This is enabled (if the RS232 Cartridge is installed when using a Tech 1) by pressing ^ for approximately 1 second until an “RS232 SET-UP” menu is displayed. Pressing ! then enables the SCREEN PRINT function. Refer to the RS232C I/F Operators Manual for more detail when using a Tech 1.

NOTE

Snapshot printing capability may not be available for all vehicles.

#

$

%

^ y , n u , d

) , !

@

&

*

E

X

15. When you are finished viewing the sampled data, press x to return to the Snapshot Option menu. If you are finished with the SNAPSHOT mode, press X again to return to the Select Mode menu.

SNAPSHOT DATA DISPLAY ACTIVE KEYS


Scroll through selected samples.

Fix top or bottom display parameter respectively.

Display trouble codes for current sample.

Display cause of SNAPSHOT trigger.

Advance to first (earliest) sample.

Advance to trigger sample (sample 0).

Advance to last (most recent) sample.


Print current data sample (if equipped with RS232C I/F Cartridge and printer).

Toggle between sample index and sample time display.

Return to Snapshot Option menu.



CLASS 2 SNAPSHOT DATA DISPLAY PHASE

Snapshot data from a Class 2 system can be displayed before entering the GM Chassis Application software.

If a Snapshot is saved in memory, the tester displays the following screen, asking if you would like to replay the snapshot before entering the vehicle selection process.

Replay saved

Snapshot data?

(YES/NO)

If you select NO, the tester continues and allows you to select the model year and body VIN. You can continue testing as normal; however, if you choose YES, the tester displays the saved snapshot:

GENERAL MOTORS

CHASSIS SYSTEMS

1986-2004 vX.X [ENTER]

e

(If Snapshot is Saved)

Replay saved

Snapshot data?

(YES/NO)

Y

N

Select

Model Year

2004 (4)

[ENTER]


OCCURED ON:

MANUAL KEY PRESS

5 Seconds

Go to first frame of Snapshot x

Go to Regular vehicle selection and testing.

Dvr Frontal Loop

Disabled

Pas Frontal Loop

Disabled 0

FIGURE 5-8. Class 2 Snapshot Data Display Phase


Mode F8: Information 5. Selecting and Operating Test Modes

MODE F8: INFORMATION

The purpose for the Information test mode is to supply additional information about the vehicle or system under test. Information test mode includes:

• System Status

• System Identification

• Calibration Identification

NOTE

Not all ABS systems have the F8: INFORMATION option available.

SELECT MODE

F8: INFORMATION

)

BASE PART NUMBER

XX

RAM PART NUMBER

XX

*

SELECT DATALIST

F0: MODULE INFO 1

F1: MODULE INFO 2

!

JULIAN MAKE DATE

XX

BUILD SEG NUMBER

XX

CAIB. PART NUM

XX

END MODEL PART NUM

XX

VES EQUIPPED

XX

TIM CONTROLLER

XX

*

) , !

y , n x

TCS CONTROLLER

XX

ETS CONTROLLER

XX

FIGURE 5-9. Information Test Mode

ACTIVE KEYS

Select Information mode.

Select Module Information.

Scroll through Data List.

Return to Main menu.

SYSTEM ID

XX

DRP EQUIPPED

XX


ADVICS - ABS / TCS System

ADVICS ABS SYSTEM

5. Selecting and Operating Test Modes

ADVICS - ABS / TCS SYSTEM

The ADVICS system consists of two components: the EBCM (electronic brake control module) and the

BPMV (brake pressure modulator valve). The system provides Antilock Braking, Dynamic Rear Brake

Proportioning, and Traction Control (optional). The EBCM controls the system functions and detects faults.

The EBCM contains six solenoids that are commanded ON and OFF to operate the appropriate valves in the brake pressure modulator valve (BPMV). The BPMV uses a three-circuit configuration to control hydraulic pressure to each front wheel independently and to the rear wheels as a pair. The system can decrease, hold, or increase hydraulic pressure to each wheel; however, it cannot increase hydraulic pressure above the amount which is transmitted by the master cylinder during braking.


Diagnostic data parameters are monitored by the scantool. The vehicle can be driven while these diagnostic data parameters are being displayed. Intermittent analog signals can be monitored to determine if the signal varies. Input/output parameter status is also displayed. Please refer to the applicable section in common test mode descriptions.

MODE F2: DTCS

Trouble codes are stored in the ECU memory and can be displayed in the scantool. In addition to the DTC number, a brief description of the DTC can be displayed. DTCs can also be cleared from ECU memory.

Please refer to the applicable section in common test mode descriptions.


The ABS snapshot helps isolate problems of intermittent operation. Information is captured before and after a trigger condition. The manual and automatic trigger can be selected. You will also be allowed to review a stored snapshot from this menu. Please refer to the applicable section in common test mode descriptions.

MODE F4: OBD CONTROLS

Submode F0: Solenoid Test

The solenoid tests allow you to manually actuate each of the hydraulic control valves. You can select between the actuation of the dump and isolation valves for each ABS channel. Once a solenoid has been commanded ON, the EBCM automatically turns it off after about 3 seconds to avoid damage to the solenoid. If the solenoid is commanded ON again, the ECBM may refuse to actuate the solenoid again until a cooling off period has elapsed.


ADVICS - ABS / TCS System 5. Selecting and Operating Test Modes

Submode F1: Pump Motor

This function allows you to command the ABS pump motor on and off. Once the pump has been commanded ON, the EBCM automatically turns it off to avoid damage to the pump motor. If the pump is commanded ON again, the ECBM may refuse to actuate the pump again until a cooling off period has elapsed.


Vehicles with Bosch ABS 5. Selecting and Operating Test Modes

BOSCH ABS / SUSPENSION /

STEERING SYSTEMS

VEHICLES WITH BOSCH ABS

If you are testing a 1990 - 94 VIN = B, D, E, K, or Y (without ASR or TCS) vehicle, the following message is displayed until you install the adapter, or press X.

DATA LIST MODE

INSTALL BOSCH

ABS ADAPTER

The following Bosch ABS Systems require the 12/12 Pin Bosch Adapter:

MODEL YEAR

1990

1991

1992

1993

1994

12/12 PIN BOSCH ADAPTER REQUIRED

D, Y-Cars

B, D, E, K, Y-Cars

B, D, E, K-Cars

B-Cars; E, K-Cars without TCS

B, D, E, K, Y without TCS

IMPORTANT NOTICE FOR BOSCH SYSTEMS

When testing vehicles equipped with Bosch ABS systems (B, C, D, E, K, Y, or V bodies), the vehicle’s ignition switch must be turned OFF after performing ABS testing, disconnecting the tester, and before the vehicle is driven. ABS braking is not available until after the ignition is cycled. Also, the “Service ABS” indicator may be illuminated during testing.

BOSCH 2S MICRO - ABS / ASR SYSTEM

When diagnosing the Bosch ABS 2S Micro system using the scantool, the 12/12 Pin Bosch Adapter (P/N

02001033) must be connected to the ALDL connector. The ALDL connector is located below the left side of the instrument panel. The ABS system is disabled by the EBCM when testing the system using a scantool. The service ABS light comes on while performing ABS tests when the ignition is turned ON.

Ensure ignition is OFF before disconnecting or connecting the scantool.


Bosch 2S Micro - ABS / ASR System 5. Selecting and Operating Test Modes

CAUTION!

Once scantool is disconnected, ensure ignition is OFF at least 10 seconds before road testing vehicle. This allows the system to return to normal

CAUTION

operation. When testing is completed, ignition must remain OFF for at least 10 seconds to return ABS system to normal operation.


Wheel speed and brake switch status parameters are monitored by the scantool. The vehicle can be driven while the diagnostic data parameters are being displayed.

See

Mode F0: Data List on page 111.

for more information.

MODE F1: CODE HISTORY

In this mode, trouble code history data is displayed on the scantool. History data includes how many ignition cycles since trouble code occurred, brake switch status, vehicle speed and ABS state when trouble code occurred. Up to 3 trouble codes are included in ABS history data.

See

Mode F2: DTC(s) on page 113.


MODE F2: TROUBLE CODES

Trouble codes are stored in the EBCM and are displayed in the scantool. Up to 3 trouble codes can be stored in the EBCM. The EBCM also records when a trouble code was stored and ABS status when trouble code was set. During trouble code display, a 3 second delay occurs between each trouble code displayed, and a brief description of the trouble code is displayed. Trouble codes can also be cleared from the EBCM memory. The EBCM also stores other information about trouble codes such as brake light switch data, ABS state, vehicle speed and ignition cycles. This information can be displayed using the ENHANCED

DIAGNOSTIC DATA function. This indicates the brake switch status to determine if brake switch was ON or OFF when trouble code was set. The ABS state indicates if antilock brake mode was active when trouble code was set. The vehicle speed at the time trouble code was set can be displayed. Ignition cycles are displayed to indicate how many ignition cycles occurred since trouble code was set.

See



MODE F3: ABS SNAPSHOT

The ABS snapshot helps isolate problems of intermittent ABS operation caused by wheel speed sensor signals. Information is captured before and after a trigger condition. The manual and automatic trigger can be selected.

See

Mode F3: Snapshot on page 117.




MODE F4: ABS/TCS TESTS

In this mode, the ABS test mode performs function tests on ABS system used to verify proper system operation. Testing and observing test results can further identify error conditions. When in this mode, the following tests can be performed:

• F0: Solenoid Test

• F1: Auto Test

• F2: Lamp Test

• F3: Pilot Valve Test

• F4: ASR Test

The submodes listed above are described in the following submode sections.


Solenoid Valve Pressure Reduction

This test activates selected wheel circuit values in the modulator valve by placing the valve in pressure reduce position. Valve action can be verified by checking appropriate wheel for braking action. The scantool indicates whether valve operated correctly. To perform pressure reduce test, raise and support vehicle. Depress brake pedal. Use the scantool to command the PRESSURE REDUCE mode. Try to spin the wheel being tested. Wheel should spin if solenoid valve reduces pressure.

Solenoid Valve Pressure Hold

This test activates selected wheel circuit valves in the modulator valve by placing valve in pressure-hold position. Valve action can be verified by checking appropriate wheel for braking action. The scantool indicates whether valve operated correctly. To perform pressure hold test, raise and support vehicle. Spin wheel freely. Use the scantool to command the PRESSURE HOLD mode. Have assistant apply brakes. Try to spin the wheel being tested. Wheel should spin, even with brakes applied, due to the hold command.

Make sure you follow the procedures in the service manual when you are performing this test. This test normally takes approximately 15 seconds to perform. If the test is performed in less than 1 second, or if you see a “TEST INHIBITED” message displayed on the tester, you should cycle the ignition on the vehicle and disconnect and reconnect power to the tester. If the “SOLENOIDS OFF” message is not displayed within 30 seconds, you probably have a bad connection to the DLC. Check the connection, cycle the ignition and cycle power to the tester before rerunning the test.

To select Solenoid Tests, do the following:

1. Select ABS/TCS TESTS by pressing $.

2. Select Solenoid Tests by pressing ). If vehicle speed is detected, the tester screen informs you that the test cannot be run while vehicle is moving.



SELECT MODE

F3: SNAPSHOT

F4: ABS/TCS TESTS

F5: TP SENSR LRN

$

SELECT ABS TEST

F0: SOLENOID TST

F1: AUTO. TEST

F2: LAMP TEST

)

** IMPORTANT **

FOLLOW SERVICE

MANUAL STEPS TO

DIAGNOSE-PRESS

u

SELECT SOLENOID

F0: LEFT FRONT

F1: RIGHT FRONT

F2: REAR AXLE

)

SELECT SOLENOID

F0: LF F1: RF

F4: LR F5: RR

)

LF SOLENOID TEST

= PRESSURE HOLD

= PRESS. RELEASE

u d u


= PRESSURE HOLD


HOLD FUNCTION ON

15 Sec


= PRESSURE HOLD


SOLENOIDS OFF

d

15 Sec

x


= PRESSURE HOLD


REL. FUNCTION ON

FIGURE 5-10. Manual Solenoid Test



3. If no vehicle speed is detected, the screen advises you to follow the Service Manual steps to diagnose.

Press U to continue with the solenoid tests.

4. The following Select Solenoid test menu is displayed. Press the key to the left of the function you wish to test.

SELECT SOLENOID

F0: LEFT FRONT

F1: RIGHT FRONT

F2: REAR AXLE

SELECT SOLENOID

F0: LF F1: RF

F4: LR F5: RR

Example of 3-Sensor

Bosch System


Bosch System

5. Press U to actuate the pressure hold function for the selected solenoid, or D for the pressure release function. The solenoids automatically turn off after six seconds. Depending on the status of the solenoids, “HOLD FUNCTION ON”, “REL. FUNCTION ON”, or “SOLENOIDS OFF” is displayed on the bottom line of the tester screen.

6. To select a different solenoid to test, use the X key to return to the Select Solenoid menu, or just press the key for the next wheel that you wish to test.

7. To return to the ABS/TCS TESTS menu, press X while the Select Solenoid menu is displayed.

8. To return to the test mode menu, press X while the ABS/TCS TESTS menu is displayed.

) %

U d x

ACTIVE KEYS

Select Solenoid Test, or a solenoid for testing.

Confirm if you wish to continue Solenoid Tests, or actuate the pressure hold function.

Actuate the pressure release function.

Return to Select Solenoid menu.

Submode F1: Automatic Test

This test is automatically performed once by EBCM during each ignition cycle, when vehicle reaches approximately 4 mph. The scantool performs this test automatically during ABS/TCS Tests mode. The auto test cycles each solenoid valve and pump motor to check component operation. If a failure exists, EBCM sets a trouble code and activates the ABS light.

This test normally takes approximately 6 seconds to perform. If the test is performed in less than 1 second or if you see a “TEST INHIBITED” message displayed on the tester, the test did not function properly. You should cycle the ignition on the vehicle and disconnect and reconnect power to the tester before rerunning the test.

If the “AUTOMATIC TEST COMPLETE” message is not displayed within 30 seconds, you probably have a bad connection to the DLC. Check the connection, cycle the ignition and cycle power to the tester before rerunning the test.



To select Auto Test, do the following:


2. Select AUTO. TEST by pressing !.

3. If vehicle speed is detected, the tester screen informs you that the test cannot be run while vehicle is moving.

If a current trouble code is set, the tester informs you that the test cannot be run. On vehicles with ASR, if low voltage on the valve relay is detected, you are instructed to cycle the ignition and see the service manual.

4. Press E to begin the Automatic Tests.

5. The tester initializes the test, then automatically cycles each solenoid and pump motor.

6. The tester informs you when the test is completed and displays trouble codes that were stored during the test.

7. Press X to return to the SELECT ABS TEST menu.

SELECT MODE

F3: SNAPSHOT

F4: MISC. TESTS

F5: TPS LEARN

$

SELECT ABS TEST


F1: AUTO. TEST

F2: LAMP TEST

!

AUTOMATICALLY

CYCLES EACH SOL.

AND PUMP MOTOR.

[ENTER] TO START

e

AUTOMATIC TEST

INITIALIZING TST

Less than

1 Second

AUTOMATIC TEST

*** RUNNING ***

Approx.

7 Seconds

AUTOMATIC TEST

COMPLETE.

CODES STORED:

35 61

x

FIGURE 5-11. Automatic Test

!

e x

ACTIVE KEYS

Select Automatic Tests from ABS/TCS TESTS menu.

Start the Bosch Automatic solenoid and pump motor tests.

Return to SELECT ABS TEST selection menu.



Submode F2: Lamp Test

This test is only available for all 1992-93 Y-Cars.

The Lamp Test mode allows you to control certain lamps on and off with the tester in order to determine the operational status of the lamp’s circuit, switch and bulb.

To select Lamp Test, do the following:

1. Select ABS/TCS TESTS from the Select Mode menu by pressing $.

2. Select LAMP TEST by pressing @.

3. For 1992-93 Y-Cars, a menu of lamps that can be tested is displayed. Select a lamp from the menu, then use the U key to turn the lamp on or the D key to turn the lamp off.

4. Press X to return to the LAMP TEST menu.

SELECT MODE

F3: SNAPSHOT



$

SELECT ABS TEST


F1: AUTO. TEST

F2: LAMP TEST

@

1992-93 Y-Car

LAMP TEST

F0: SERVICE ABS

F1: ABS ACTIVE

F2: SERVICE ASR

F3: ASR ACTIVE

F4: ASR OFF

)

LAMP TEST

SERVICE ABS

= ON = OFF

x

FIGURE 5-12. Lamp Test

@

) $ u , d x

ACTIVE KEYS

Select Lamp Test from the ABS/TCS Select Mode menu.

Select a lamp to test.

Control the selected lamp on or off.

Return to LAMP TEST menu.



Submode F3: Pilot Valve Test

This test applies to 1992-93 Y-Cars.

CAUTION!

CAUTION

To perform the following test, both vehicle drive wheels must be securely raised or unintended vehicle movement occurs that could injure someone.

The PILOT VALVE TEST should be performed in order to prevent any damage to the master cylinder. As soon as the pump motor is activated and fluid pressure is applied to the rear wheel circuits during ASR operation, the pilot solenoid valve, located in the hydraulic modulator assembly, moves into position and blocks pressure to the master cylinder. High pressure fluid at this time could damage the master cylinder.

In order to test the pilot solenoid valve, first raise the vehicle on a frame contact hoist, so that the wheels that are to be tested are off the ground. Then turn the ignition ON and select PILOT VALVE TEST from the

ABS/TCS TESTS menu. Have an assistant ready to command the PILOT VALVE TEST to “ON”. Try to spin the rear wheel that is being tested. If the system is working properly, the wheel should move freely.

This test allows you to check the Pilot Valve(s) by controlling the valve(s) on for 25 seconds while manually trying to turn the vehicle’s drive wheels.

To select Pilot Valve, do the following:


2. Select PILOT VALVE by pressing #.

3. Make sure the vehicle drive wheels have been securely raised. The test is performed by one technician trying to turn the drive wheels while another technician uses the U key on the tester to turn the pilot valve on and then presses the brake pedal.




SELECT MODE

F3: SNAPSHOT



$

SELECT ABS TEST

F3: PILOT VALVE

F4: ASR/TCS TEST

#

PILOT VALVE TEST

* DRIVE WHEELS

MUST BE OFF

GROUND

u

Y-Car


PILOT VALVE(S)

ON FOR 25 SEC.

= START

u

25 Second Timeout


COMPLETE

x

FIGURE 5-13. Pilot Valve Test

#

U

X

ACTIVE KEYS

Select the Pilot Valve Test from the ABS/TCS Tests Select Mode menu. (Y-Car)

Control the pilot valve on.

Return to SELECT ABS TEST menu.



Submode F4: ASR Test

This test applies to 1992-93 Y-Car.

CAUTION!

CAUTION

To perform the following test both vehicle drive wheels must be securely raised or there unintended vehicle movement occurs that could injure someone.

To ensure that ASR test results are accurate, the PILOT VALVE TEST must be run first. Once this is accomplished the ASR TEST can be utilized to run the ABS pump motor, which applies fluid pressure to the rear wheel circuits. After the vehicle has been raised on its frame, both the Pilot Valve(s) and Pump

Motor can be turned on while a technician manually tries to turn the drive wheels.

To select ASR Test, do the following:

1. Select ABS/TCS TESTS from the Select Mode menu by pressing $.

2. Select ASR TEST by pressing $.

3. The tester display informs you that the Pilot Valve test should be run before performing the ASR test. If necessary, run the Pilot Valve test.

4. Make sure the drive wheels have been securely raised, then press U to begin the ASR test. The pump motor and pilot valve(s) are run for 25 seconds, then automatically turned off. TEST COMPLETE is displayed by the tester at the completion of the test. See the Service Manual for further information.




SELECT MODE

F3: SNAPSHOT



$

SELECT ABS TEST

F3: PILOT VALVE

F4: ASR TEST

$

PILOT VALVE

TEST SHOULD BE

RUN FIRST

Display for 4 seconds or

advance with u keypress.

ASR TEST

* DRIVE WHEELS

MUST BE OFF

GROUND

u

TEST RUNS PUMP

& PILOT VALVE(S)

FOR 25 SECONDS

= START

u

25 second time-out

ASR TEST

COMPLETE

x

FIGURE 5-14. ASR Test

$ u x

ACTIVE KEYS

Select ASR Test from the ABS/TCS Select Mode menu.

Begin the ASR Test.

Return to SELECT ABS TEST menu.



MODE F5: TP SENSOR LEARN

This test applies to 1992-93 Y-Cars.

If a new Throttle Position Sensor (TPS) or Throttle Body is installed, EBTCM must learn the new TPS idle

Position Voltage. This learn procedure is necessary to ensure effective engine torque reduction during ASR operations.

To select TP Sensor Learn, do the following:

1. Select F5: TP SENSOR LRN from the Select Mode menu.

2. Press u to acknowledge that you wish to run the TP Sensor Learn procedure. TP SENSOR LEARN IN

PROGRESS is displayed while the TP Sensor Learn function is being performed.

3. If the tester successfully resets the EBTCM, TP SENSOR LEARN COMPLETE is displayed for 4 seconds, then the Select Mode menu is displayed.

If the tester does not accept the TP Sensor Learn command, or if a trouble code is stored, you are instructed to turn the ignition off, then turn it back on. After the ignition is cycled the tester attempts to run the TP Sensor Learn test again. If the process is successful, the tester informs you that TP Sensor

Learn is complete.

If the TP Sensor Learn function is still unsuccessful, the tester informs you either that the TP Sensor

Learn test failed and that you should refer to Section 5E1 of the Service manual, or you are informed that trouble codes are present and to press @ to view the codes. Resolve the cause of the trouble codes then run TP Sensor Learn again.




SELECT MODE

F3: SNAPSHOT

F4: MISC. TEST


TP SENSR LEARN

TO START

u

TP SENSR LEARN

IN PROGRESS

If TP Sensor Learn is unsuccessful.

TURN IGNITION

OFF THEN ON

TP SENSR LEARN

COMPLETE

Trouble Codes Present.

4 Seconds

No Trouble

Codes.

TP SENSR LEARN

IN PROGRESS

TROUBLE CODES

PRESENT PRESS

F2 TO VIEW

CODES

TP SENSR LEARN

FAILED SEE

SERVICE MANUAL

SECTION 5E1

TP SENSR LEARN

COMPLETE

4 Seconds

FIGURE 5-15. Throttle Position Sensor Learn

%

@ u x


ACTIVE KEYS

Select TP Sensor Lrn from the Select Mode menu.

Display trouble codes.

Acknowledge that you wish to perform the TP Sensor Learn function

Return to the Select Mode menu.

Page 143

Bosch 2S Micro - Select Ride System 5. Selecting and Operating Test Modes

BOSCH 2S MICRO - SELECT RIDE SYSTEM

MODE F0: FLASH CODES

The selection FLASH DTCs or FLASH CODES is displayed when testing a Y car with Selective Ride

Control and when the Select Ride system is selected on the tester. When selected, the tester causes the Ride

Control Lamp to flash any trouble codes that are present. Refer to the F1 function for clearing trouble codes.

Selective Ride Control tests (SEL) are available for 1989-93 Y-Body vehicles.

The Selective Ride Control tests allow you to view trouble codes associated with the ride control system.

The codes are flashed on the Ride Control Lamp (Selective Ride Control system).

To select Flash Codes, do the following:

1. Press ! from the Select System menu to FLASH CODES related to the Selective Ride Control system.

2. Press ) to FLASH CODES on the Selective Ride Control Lamp.

3. Press ! to select Clear Codes. The tester instructs you to press the u key to clear all ride control trouble codes.


CAUTION!

CAUTION

When using the MTS 3100, the cigarette lighter adapter must be used to supply a path to ground.



SELECT SYSTEM

F0: ABS

F1: SELECT RIDE

!

SELECT MODE

F0: FLASH CODES

F1: CLEAR CODES

) !

WATCH SERVICE

RIDE CONTROL

LAMP

CLEAR CODES

PRESS

FIGURE 5-16. Select Ride u

!

) u x

ACTIVE KEYS

Choose Select Ride. Select Clear Codes.

Select Flash Codes.

Clear trouble codes.

Return to the SELECT MODE menu.



MODE F1: CLEAR CODES

The selection CLEAR DTCs or CLEAR CODES is displayed when testing a Y car with Selective Ride

Control and when the Select Ride system is selected on the tester. When selected, the tester erases the Ride

Control DTC(s) that are present.

Selective Ride Control tests (SEL) are available for 1989-93 Y-Body vehicles.

The Selective Ride Control tests allow you to clear trouble codes associated with the ride control system.


To select Clear Codes, do the following:

1. Press ! from the Select System menu to CLEAR CODES related to the Selective Ride Control system.


3. Press ! to select Clear Codes. The tester instructs you to press the u key to clear all ride control trouble codes.


SELECT SYSTEM

F0: ABS

F1: SELECT RIDE

!

SELECT MODE

F0: FLASH CODES

F1: CLEAR CODES

) !

!

) u x


WATCH SERVICE

RIDE CONTROL

LAMP

CLEAR CODES

PRESS

u

FIGURE 5-17. Clear Codes

ACTIVE KEYS

Choose Select Ride. Select Clear Codes.

Select Flash Codes mode.

Clear codes.


Page 146

Bosch 2U - ABS / TCS System 5. Selecting and Operating Test Modes

BOSCH 2U - ABS / TCS SYSTEM

The Bosch 2U Antilock Brake System (ABS) increases vehicle steerability, directional stability and optimum deceleration in severe braking conditions on most road surfaces. The ABS monitors wheel speed and controls brakeline pressure to eliminate uncontrolled skidding.

Bosch 2U ABS consists of Electronic Brake Control Module (EBCM), hydraulic modulator, solenoid valves, pump motor, ABS valve relay, pump relay, Antilock warning light, and speed sensors on front wheels, rear wheels or rear axle.

CAUTION!

Once scantool is disconnected, ensure ignition is OFF at least 10 seconds before road testing vehicle. This allows the system to return to normal

CAUTION




See





See


for more information




See







See




In this mode, the ABS test mode performs function tests on ABS system used to verify proper system operation. Testing and observing test results can further identify error conditions. When in this mode, the following tests can be performed:


• F1: Auto Test

• F2: Lamp Test

• F3: Pilot Valve Test

• F4: TCS Test




This test activates selected wheel circuit valves in the modulator valve by placing the valve in the pressure reduce position. Valve action can be verified by checking appropriate wheel for braking action. The scantool indicates whether the valve operated correctly. To perform pressure reduce test, raise and support vehicle. Depress brake pedal. Use the scantool to command the PRESSURE REDUCE mode. Try to spin the wheel being tested. Wheel should spin if solenoid valve reduces pressure.



Make sure you follow the procedures in the service manual when you are performing this test. This test normally takes approximately 15 seconds to perform. If the test is performed in less than 1 second, or if you see a “TEST INHIBITED” message displayed on the tester, you should cycle the ignition on the vehicle and disconnect and reconnect power to the tester. If the “SOLENOIDS OFF” message is not displayed within 30 seconds, you probably have a bad connection to the DLC. Check the connection, cycle the ignition and cycle power to the tester before rerunning the test.



To select Solenoid Tests, do the following:

1. Select ABS TESTS by pressing $.

2. Select Solenoid Test by pressing ).




5. The following Select Solenoid menu is displayed. Press the key to the left of the function you wish to test.

SELECT SOLENOID

F0: LEFT FRONT

F1: RIGHT FRONT

F2: REAR AXLE


Bosch System

SELECT SOLENOID

F0: LF F1: RF

F4: LR F5: RR


Bosch System

6. Press U to actuate the pressure hold function for the selected solenoid, or D for the pressure release function. The solenoids automatically turn off after six seconds. Depending on the status of the solenoids, “HOLD FUNCTION ON”, “REL. FUNCTION ON”, or “SOLENOIDS OFF” is displayed on the bottom line of the tester screen.

7. To select a different solenoid to test, use the X key to return to the Select Solenoid menu, or just press the key for the next wheel that you wish to test.

8. To return to the OBD CONTROLS menu, press X while the Select Solenoid menu is displayed.

9. To return to the test mode menu, press X while the OBD CONTROLS menu is displayed.



SELECT MODE

F3: SNAPSHOT



$

SELECT TEST


F1: AUTO. TEST

F2: LAMP TEST

)

** IMPORTANT **

FOLLOW SERVICE

MANUAL STEPS TO

DIAGNOSE-PRESS

u

) % u d x

SELECT SOLENOID

F0: LEFT FRONT

F1: RIGHT FRONT

F2: REAR AXLE

)

SELECT SOLENOID

F0: LF F1: RF

F4: LR F5: RR

)


= PRESSURE HOLD


u d


= PRESSURE HOLD



u


= PRESSURE HOLD


SOLENOIDS OFF

d

15 Sec

x

FIGURE 5-18. Solenoid Test

15 Sec


= PRESSURE HOLD



ACTIVE KEYS

Select Solenoid Test, or a solenoid for testing.



Return to SELECT SOLENOID menu.




This test is automatically performed once by EBCM during each ignition cycle, when vehicle reaches approximately 4 mph. The scantool performs this test automatically during ABS tests mode. The auto test cycles each solenoid valve and pump motor to check component operation. If failure exists, EBCM sets a trouble code and activate the ABS light.




1. Select OBD CONTROLS by pressing $.



If a current trouble code is set the tester informs you that the test cannot be run. On vehicles with TCS, if low voltage on the valve relay is detected, you are instructed to cycle the ignition and see the service manual.

4. Press E to begin the Automatic Test.

5. The tester initializes the test, then automatically cycle each solenoid and pump motor.


7. Press X to return to the SELECT TEST menu.



!

e x

SELECT MODE

F3: SNAPSHOT

F4: MISC. TESTS


$

SELECT TEST


F1: AUTO. TEST

F2: LAMP TEST

!

AUTOMATICALLY


AND PUMP MOTOR.


e

AUTOMATIC TEST


Less than

1 Second

FIGURE 5-19. Automatic Test

ACTIVE KEYS

Select Auto. Tests from OBD CONTROLS menu.

Start the Automatic Test.

Return to SELECT TEST menu.

AUTOMATIC TEST

*** RUNNING ***

Approx.

7 Seconds

AUTOMATIC TEST

COMPLETE.

CODES STORED:

35 61

x




This test is only available for all 1994-95 Y-Cars and 1993-94 D, E, K, and V-Cars.

The Lamp Test mode allows you to control certain lamps ON and OFF with the tester in order to determine the operational status of the lamp’s circuit, switch and bulb.


1. Select OBD CONTROLS from the Select Mode menu by pressing $.


3. For 1994-95 Y-Cars, only the red brake light can be tested.


SELECT MODE

F3: SNAPSHOT

F4: MISC. TESTS


$

SELECT TEST


F1: AUTO. TEST

F2: LAMP TEST

@

LAMP TEST

RED BRAKE LIGHT

= ON = OFF

x


@ u , d x

ACTIVE KEYS

Select Lamp Test from the OBD CONTROLS menu.

Control the selected lamp on or off.

Return to SELECT MODE menu.



Submode F3: Pilot Valve Test

This test applies only to 1994-95 Y and 1993-94 D, E, K and V-Cars.

CAUTION!

CAUTION

To perform the following test both vehicle drive wheels must be securely raised or unintended vehicle movement occurs that could injure someone.

The drive wheels must be off the ground to perform the Pilot Valve

Test.

This test allows you to check the Pilot Valve(s) by controlling the valve(s) ON for 25 seconds while manually trying to turn the vehicle’s drive wheels. The E, K and V-Cars have Left and Right Pilot Valves that are tested independently. D, and Y cars do not have separate left and right pilot valve tests.

To select Pilot Valve, do the following:


2. Select PILOT VALVE by pressing #.

3. If you are testing an E, K or V-Car, select Left Pilot Valve by pressing ) or Right Pilot Valve by pressing !.

4. Make sure the vehicle drive wheels have been securely raised. The test is performed by one technician trying to turn the drive wheels while another technician uses the U key on the tester to turn the pilot valve on and then presses the brake pedal.



Bosch 2U - ABS / TCS System

SELECT MODE

F3: SNAPSHOT

F4: MISC. TESTS


$

SELECT TEST

F3: PILOT VALVE

F4: ASR/TCS TEST

#


* DRIVE WHEELS

MUST BE OFF

GROUND

u

Y-Car


PILOT VALVE(S)

ON FOR 25 SEC.

= START

u

25 Second Timeout


COMPLETE

x

FIGURE 5-21. F3: Pilot Valve Test


)

!

#

U

X

ACTIVE KEYS

Select Left PILOT VALVE Test from the Pilot Valve Test menu. (E, K, V-Car)

Select Right PILOT VALVE Test from the Pilot Valve Test menu. (E, K, V-Car)

Select the PILOT VALVE Test from the Select Test menu. (D, Y-Car)

Control the pilot valve on.




Submode F4: TCS Test

This test applies to 1993 V-Cars, 1993-94 D, E, and K-Cars, and 1994-95 Y-Cars.

CAUTION!

CAUTION

To perform the following test both vehicle drive wheels must be securely raised or unintended vehicle movement could occur.

Before testing, please ensure that the vehicle is properly supported with its drive wheels off the ground.

In the Traction Control System (TCS) Test, both the Pilot Valve(s) and Pump Motor can be turned on while a technician manually tries to turn the drive wheels.

To select TCS Test, do the following:


2. Select TCS TEST by pressing $.

3. The tester display informs you that the Pilot Valve test should be run before performing the TCS test. If necessary, run the Pilot Valve test.

4. Make sure the drive wheels have been securely raised, then press U to begin the TCS test. The pump motor and pilot valve(s) are run for 25 seconds, then automatically turned off. TEST COMPLETE is displayed by the tester at the completion of the test. See the Service Manual for further information.




$ u x

If E, K, V-Car

SELECT MODE

F3: SNAPSHOT

F4: OBD CONTROLS


$

If D, Y-Car

SELECT TEST

F3: PILOT VALVE

F4: TCS TEST

$

PILOT VALVE

TEST SHOULD BE

RUN FIRST

Display for 4 Seconds or Advance with

u

TCS TEST

* DRIVE WHEELS

MUST BE OFF

GROUND

u

TEST RUNS PUMP


FOR 25 SECONDS

= START

u

25 Second

Time-Out

TCS TEST

COMPLETE

SELECT TEST

F3: PILOT VALVE

F4: ASR TEST

$

PILOT VALVE

TEST SHOULD BE

RUN FIRST

Display for 4 Seconds or Advance with

u

ASR TEST

* DRIVE WHEELS

MUST BE OFF

GROUND

u

TEST RUNS PUMP


FOR 25 SECONDS

= START

u

25 Second

Time-Out

ASR TEST

COMPLETE

x x

FIGURE 5-22. TCS Test

ACTIVE KEYS

Select TCS Test from the SELECT TEST menu.

Begin the TCS Test.



Bosch 2U - VES System 5. Selecting and Operating Test Modes

BOSCH 2U - VES SYSTEM

Variable Effort Steering (VES) is available on selected 1992-93 D-and N-Body vehicles and 1992-94 Buick

B-Body vehicles.

The Variable Effort (VE) steering controller outputs a signal which controls the amount of power steering assist relative to the vehicle’s speed. At low speeds, the power steering assist is increased to improve maneuverability. At higher speeds, the amount of assist is decreased to improve “road feel”.

To do this, the Variable Effort (VE) steering controller drives a solenoid with a variable duty cycle signal.

With the tester, you can display the duty cycle of this signal. A low duty cycle corresponds to a high degree of power assist, while a high duty cycle means a low amount of assist. For 1993 D-Cars you can control the duty cycle while monitoring the feedback current.

MODE F0: DUTY CYCLE

To select Duty Cycle Test, do the following:

1. Press ! from the SELECT SYSTEM menu to test VE steering system.

2. Press ) to select the DUTY CYCLE TEST from the Select Mode menu.

3. For 1993 D-cars, press u to command the duty cycle to 60%, or press d to command the duty cycle to 0% while monitoring the feedback current.





OF VIN CODE

(BODY TYPE):

BCDEHJKLNUVWYZ

B, D or N-Body

SELECT SYSTEM:

F0: ABS/TCS

F1: VES

!

SELECT MODE

F0: DUTY CYCLE

TEST

)

VES ACTUATOR TST

DUTY CYCLE = 46%

X

!

) u d x

FIGURE 5-23. Duty Cycle

ACTIVE KEYS

Select VES from the Select System menu.

Select Duty Cycle TEST.

Go to 60% duty cycle (93 D-Car only).






Submode F1: VES Test

This test mode is available when testing 1993-96 D and Y body vehicles equipped with Bosch ABS systems, with Variable Effort Steering (VES). This test allows you to diagnose the VES actuator.

The Variable Effort (VE) steering ECU outputs a signal which controls the amount of power steering assist relative to the vehicle’s speed. At low speeds, the power steering assist is increased to improve maneuverability. At higher speeds, the amount of assist is decreased to improve “road feel”.

To do this, the Variable Effort (VE) steering ECU drives a solenoid with a variable duty cycle signal. With the tester, you can display the duty cycle of this signal. A low duty cycle corresponds to a high degree of power assist, while a high duty cycle means a low amount of assist. For 1993 D-Cars you can control the duty cycle while monitoring the feedback current.

For vehicles other than 1993 D-Cars, the tester displays the current value of the actuator duty cycle of the control signal on DLC Pin D.

NOTE

If there are no communications on Pin D, the tester displays one of two messages. If a duty cycle is not detected, the tester displays “NO DUTY

CYCLE PRESENT”. This could be due to a fixed voltage at Pin D or an open circuit to Pin D. If Pin D is shorted to ground, the tester displays

“PIN D ALWAYS LOW”. Also, the tester displays the “NO DUTY

CYCLE PRESENT” message if VE steering is not installed on the vehicle or no pin is in cavity “D” of the DLC connector.

To select the VES test, do the following:

1. Once you are in the VES system of a D or Y-car ABS selection, press $ to select OBD CONTROLS from the VES SELECT MODE screen.

This initiates the VES test.

2. Follow the instructions as prompted on the screen of the tester.

NOTE

Refer to the vehicle manufacturer’s service information when performing this test.


Bosch 2U - VES System

SELECT SYSTEM

F0: ABS/TCS

F1: VES

!

SELECT MODE

F0: DATA LIST

F2: DTC(s)

F4: MISC. TESTS

$

**IMPORTANT**

Follow Service Manual

Steps to Diagnose

VES TEST

FEEDBACK CURRENT

800 MILLIAMPS

= ON = OFF

X

FIGURE 5-24. F1: VES Test


!

$ u d x

ACTIVE KEYS

Select VES from the SELECT SYSTEM menu.

OBD CONTROLS.

Turn ON Feedback Current.

Turn OFF Feedback Current.



Bosch 2U - Select Ride System 5. Selecting and Operating Test Modes

BOSCH 2U - SELECT RIDE SYSTEM

The selection FLASH DTCs or FLASH CODES is displayed when testing a Y car with Selective Ride

Control and when the SEL system is selected on the tester. When selected, the tester causes the Ride Control

Lamp to flash any trouble codes that are present. Refer to the F1 function for clearing trouble codes.

The Selective Ride Control tests allow you to view trouble codes associated with the ride control system.



To select Flash Codes, do the following:

1. Press ! from the SELECT SYSTEM menu to view trouble codes related to the Selective Ride Control system.


3. Press ! to select CLEAR CODES. The tester instructs you to press the u key to clear all Select Ride trouble codes.

4. Press X to return to the SELECT SYSTEM menu.

CAUTION!

CAUTION

When using the MTS 3100, the cigarette lighter adapter must be used to supply a path to ground.



SELECT SYSTEM

F0: ABS

F1: SELECT RIDE

!

SELECT MODE

F0: FLASH CODES

F1: CLEAR CODES

) !

WATCH SERVICE

RIDE CONTROL

LAMP

CLEAR CODES

PRESS

u

FIGURE 5-25. F1: Select Ride

!

) u x

ACTIVE KEYS

Choose Select Ride Control system. Select Clear Codes.

Select Flash Codes mode.

Clear trouble codes.

Return to the SELECT SYSTEM menu.



MODE F1: CLEAR CODES

The selection CLEAR DTCs or CLEAR CODES is displayed when testing a Y car with Selective Ride

Control and when the SEL system is selected on the tester. When selected, the tester erases the Ride Control

DTC(s) that are present.

The Selective Ride Control tests allow you to clear trouble codes associated with the ride control system.


To select Clear Codes, do the following:

1. Press ! from the SELECT SYSTEM menu to clear codes related to the Selective Ride Control system.


3. Press ! to select CLEAR CODES. The tester instructs you to press the u key to clear all ride control trouble codes.

4. Press X to return to the SELECT SYSTEM menu.

SELECT SYSTEM

F0: ABS

F1: SELECT RIDE

!

SELECT MODE

F0: FLASH CODES

F1: CLEAR CODES

) !

WATCH SERVICE

RIDE CONTROL

LAMP

CLEAR CODES

PRESS

u

FIGURE 5-26. F1: Clear Codes

!

) u x


ACTIVE KEYS

Choose SELECT RIDE Control system. Select CLEAR CODES.

Select FLASH CODES mode.

CLEAR CODES.

Return to the SELECT SYSTEM menu.

Page 164

Bosch 2U - RSS / ELC System 5. Selecting and Operating Test Modes

BOSCH 2U - RSS / ELC SYSTEM

After replacement of the Road Sensing Suspension (RSS) control module, the following steps must be performed:

• RSS control module calibration.

• Steering sensor trim position adjustment.

• Trim height adjustment.

NOTE

New RSS control modules must be calibrated after installation. A code

S050 or S051 may be stored in memory of new RSS control modules and does not clear until the module is calibrated.

MODE F0: RSS CALIBRATE

To calibrate the RSS Control Module, do the following:

1. Select RSS Calibrate by pressing ).

2. Key ON, engine OFF.

3. Follow user instructions on scantool screen.

4. After calibrating RSS control module, a trim height adjustment procedure and a steering sensor trim position adjustment must be performed.

Selecting RSS DTCs

RSS DTCs can be retrieved using the on-board diagnostics available on the vehicle.

To select RSS DTCs, do the following:

1. Turn the ignition switch to the “ON” position.

2. Push the “OFF” and red (warmer) buttons on the Climate Control Center (CCC) simultaneously and hold until the segment check appears on the instrumental panel cluster.

Segment Check

A segment check is when all lights in the IPC are turned on. The purpose of illuminating the IPC is to verify that all segments of the LED displays are working. Further diagnostics should not be attempted unless all segments appear, as this could lead to misdiagnosis. If any portions or segments of the IPC display are inoperative, diagnose and report this problem first.



Selecting the RSS System

Following the display (flashing) of any trouble codes present, the first available system is displayed.

While selecting a system to test, take any of the following actions to control the display:

• Depressing the fan speed up “

↑” button on the CCC selects the displayed system for testing.

• Depressing the fan speed down “

↓” button on the CCC displays the next available system selection. This allows the display to be stepped through all system choices.

• Depressing the “OFF” button on the CCC stops the test type selection process and return the display to the next available vehicle system selection.

NOTE

Refer to the GM Service Manual for additional information.



GOOD

RSS CALIBRATION

COMPLETE

y

SELECT DESIRED

RSS CALIBRATION

F0: ETC

F1: ELD

SELECT MODE

F0: RSS CALIBRATE

F1: ELC TRIM SET

F2: SWPS

)

ROAD SENSING

SUSPENSION

RECALIBRATION

PRESS [ENTER]

E

ENSURE VEHICLE

IS ON A FLAT AND

LEVEL SURFACE

D

BE SURE ENGINE

IS OFF AND IGN.

KEY IS IN THE

RUN POSITION

D

IS VIN CORRECT?

1G6ET1299SU601797

n

VIN INFORMATION

DOES NOT

MATCH VEHICLE

SEE SERVICE MANUAL

TEST IN PROGRESS

BAD

NO RSS DATA

CHECK DLC

MAKE SURE ING. KEY

IS IN RUN POSITION


FROM RSS MODULE

FIGURE 5-27. F0: RSS Control Module Calibration (1993-94 Cadillac with RSS)



MODE F1: ELC TRIM SET

This tester mode is available when testing most 1993-96 E and K body vehicles with Electronic Level

Control (ELC) and Road Sensing Suspension (RSS) systems. Select this mode to set the trim for the vehicle height at the vehicle’s suspension resting position. It requires removing excess weight and entering the fuel level at the time of the trim set.

To select ELC Trim Set, do the following:

1. Select ELC Trim Set by pressing !.

2. Follow the instructions provided on the screen of the tester.

NOTE

This procedure requires the function to be performed with the key ON and the engine OFF.

SELECT TEST



!

ELECTRONIC LEVEL

CONTROL TRIM SET

ENSURE VEHICLE


LEVEL SURFACE

BE SURE ENGINE

IS OFF AND IGN.

KEY IS IN THE

RUN POSITION

FIGURE 5-28. F1: ELC Trim Set (1993-94 Cadillac with RSS)


Bosch 5.0 - ABS / TCS System 5. Selecting and Operating Test Modes

BOSCH 5.0 - ABS / TCS SYSTEM

The Bosch 5.0 Antilock Brake System / Traction Control system (ABS/TCS) increases vehicle steerability, directional stability and optimum deceleration in severe braking conditions. The ABS monitors wheel speed and controls brakeline pressure to eliminate uncontrolled skidding.

The Bosch 5.0 system also monitors rear wheel speed and compares it to front wheel speed. If excessive front wheel speed is detected at either front wheel, the TCS is activated. TCS uses front brake intervention and cylinder cut-out to provide improved traction and vehicle stability. Models with 4.9L are equipped with

ABS with timed cylinder cut-out TCS.

ABS consists of Electronic Brake and Traction Control Module (EBTCM), Brake Pressure Modulator

(BPM) valve, solenoid valves, pump motor, ABS valve relay, pump relay and speed sensors on front and rear wheels, brake booster/master cylinder assembly, “BRAKE” and “ANTILOCK” warning indicator lights and Driver Information Center (DIC).

CAUTION!

Once scantool is disconnected, ensure ignition is off at least 10 seconds before road testing vehicle. This allows the system to return to normal

CAUTION




See





See








See





See



MODE F4: MISC. TESTS (1995-96 B, E, K-BODY)

MODE F4: OBD CONTROLS (1995-96 D-BODY; 1996 Y-BODY)

In this mode, the ABS test mode performs function tests on ABS system used to verify proper system operation. Testing and observing test results can further identify error conditions.

The following tests can be performed in this mode:


• F1: Auto Test

• F2: Lamp Test

• F3: TCS Test

• F4: Auto Bleed


Submode F0: Solenoid Tests


This test activates selected wheel circuit valves in the modulator valve by placing the valve in the pressure reduce position. Valve action can be verified by checking appropriate wheel for braking action. The scantool indicates whether the valve operated correctly. To perform pressure reduce test, raise and support vehicle. Depress brake pedal. Use the scantool to command the PRESSURE REDUCE mode. Try to spin the wheel being tested. The wheel should spin if the solenoid valve reduces pressure.



Make sure you follow the procedures in the service manual when you are performing this test. This test normally takes approximately 15 seconds to perform. If the test is performed in less than 1 second, or if you see a “TEST INHIBITED” message displayed on the tester, you should cycle the ignition on the vehicle and


Bosch 5.0 - ABS / TCS System 5. Selecting and Operating Test Modes disconnect and reconnect power to the tester. If the “SOLENOIDS OFF” message is not displayed within 30 seconds, you probably have a bad connection to the DLC. Check the connection, cycle the ignition and cycle power to the tester before rerunning the test.

To select Solenoid Test, do the following:


2. Select SOLENOID TEST by pressing ).




5. The following SELECT SOLENOID menu is displayed. Press the key to the left of the function you wish to test.

SELECT SOLENOID

F0: LEFT FRONT

F1: RIGHT FRONT

F2: REAR AXLE


Bosch System

SELECT SOLENOID

F0: LF F1: RF

F4: LR F5: RR


Bosch System

6. Press U to actuate the pressure hold function for the selected solenoid, or D for the pressure release function.

The solenoids automatically turn off after six seconds. Depending on the status of the solenoids, “HOLD

FUNCTION ON”, “REL. FUNCTION ON”, or “SOLENOIDS OFF” is displayed on the bottom line of the tester screen.

7. To select a different solenoid to test, use the X key to return to the SELECT SOLENOID menu, or just press the key for the next wheel that you wish to test.

8. To return to the OBD CONTROLS menu, press X while the SELECT SOLENOID menu is displayed.

9. To return to the SELECT MODE menu, press X while the OBD CONTROLS menu is displayed.



SELECT MODE

F3: SNAPSHOT

F4: MISC. TEST


$

SELECT TEST


F1: AUTO. TEST

F2: LAMP TEST

)

** IMPORTANT **

FOLLOW SERVICE

MANUAL STEPS TO

DIAGNOSE-PRESS

u

) % u d x

SELECT SOLENOID

F0: LEFT FRONT

F1: RIGHT FRONT

F2: REAR AXLE

)

SELECT SOLENOID

F0: LF F1: RF

F4: LR F5: RR

)


= PRESSURE HOLD


u d


= PRESSURE HOLD



u


= PRESSURE HOLD


SOLENOIDS OFF

d

15 Sec

15 Sec

x

FIGURE 5-29. Solenoid Test Example


= PRESSURE HOLD



ACTIVE KEYS

Select SOLENOID TEST, or a solenoid for testing.



Return to SELECT SOLENOID menu.




The Automatic Test of the Bosch ABS performs a sequence of solenoid valve and pump motor actuations to test various functions within the ABS. The results of the test are indicated by trouble codes set during the test. The tester automatically displays the trouble codes at the completion of the test. If no trouble codes are set, the ABS passed the test.







If a current trouble code is set the tester informs you that the test cannot be run. On vehicles with TCS, if low voltage on the valve relay is detected, you are instructed to cycle the ignition and see the service manual.

4. Press E to begin the Automatic Tests.

5. The tester initializes the test, then automatically cycle each solenoid and pump motor.


7. Press X to return to the OBD CONTROLS menu.



SELECT MODE

F3: SNAPSHOT

F4: MISC. TEST


$

SELECT TEST


F1: AUTO. TEST

F2: LAMP TEST

!

AUTOMATICALLY


AND PUMP MOTOR.


e

AUTOMATIC TEST


Less than

1 Second

AUTOMATIC TEST

*** RUNNING ***

Approx.

7 Seconds

AUTOMATIC TEST

COMPLETE.

CODES STORED:

35 61

x

FIGURE 5-30. Automatic Test Example

!

e x

ACTIVE KEYS

Select AUTO TEST from OBD CONTROLS menu.

Start the Bosch Automatic solenoid and pump motor tests.

Return to OBD CONTROLS selection menu.




This test is available for all 1996 Y-Cars and 1995-96 D, E, K, and V-Cars.

The Lamp Test mode allows you to control certain lamps ON and OFF with the tester in order to determine the operational status of the lamp’s circuit, switch and bulb.




3. For 1996 Y-Cars, only the red brake light can be tested.


@ u , d x

SELECT MODE

F3: SNAPSHOT

F4: MISC. TEST


$

SELECT TEST


F1: AUTO. TEST

F2: LAMP TEST

@

LAMP TEST

RED BRAKE LIGHT

= ON = OFF

x

FIGURE 5-31. Lamp Test Example

ACTIVE KEYS

Select Lamp Test from the OBD CONTROLS menu.

Control the selected lamp ON or OFF.




Submode F3: TCS Test

This test applies to 1995-96 D, E, and K-Cars, and to 1996 Y-Cars. In the TCS Test, both the Pilot Valve(s) and Pump Motor can be turned on while a technician manually tries to turn the drive wheels.

CAUTION!

CAUTION

To perform the following test both vehicle drive wheels must be securely raised or unintended vehicle movement occurs that could injure someone.



2. Select TCS TEST by pressing #.

3. The tester display informs you that the Pilot Valve test should be run before performing the TCS test. If necessary, run the Pilot Valve test.

4. Make sure the drive wheels have been securely raised, then press U to begin the TCS TEST.

The pump motor and pilot valve(s) are run for 25 seconds, then automatically turned off. The tester displays TEST COMPLETE at the end of the test. See the Service Manual for further information.


SELECT MODE

F3: SNAPSHOT



If D, E, K, Y-Car

$

SELECT TEST

F3: TCS TEST

F4: AUTO BLEED

$

DRIVE WHEELS

MUST BE OFF

GROUND

u

TEST RUNS PUMP

AND TCS VALVE(S)

FOR 25 SECONDS

E = S TA R T u

25 Second

Time-Out

TEST COMPLETE

x

FIGURE 5-32. TCS Test Example

# u x

ACTIVE KEYS

Select TCS TEST from the OBD CONTROLS menu.

Begin the TCS TEST.

Return to OBD CONTROLS menu.



Submode F4: Auto Bleed

The Automated Bleed function or AUTO BLEED is used to provide a complete brake system bleed on

Bosch ABS systems. The tester sends commands to the EBTCM to cycle the system valves and run the ABS pump to purge air from secondary hydraulic circuits. This function should be used when it is suspected that air has been introduced into the system’s secondary circuits or when the Brake Pressure Modulator Valve

(BPMV) has been replaced with a new unit.

NOTE

Refer to the appropriate service manual and follow instructions when performing the AUTO BLEED function.

To perform the Auto Bleed Test, do the following:

1. Raise and support vehicle. Remove wheels. Inspect brake system for leaks or damage. Repair as necessary before continuing. Bleed base brake system.

2. Ensure battery is fully charged. Connect scantool to Data Link Connector (DLC). Turn ignition ON, engine OFF. Select F4: Auto Bleed and press E. Tests are performed to determine Antilock

Brake System/Traction Control System (ABS/TCS) condition. If no faults are detected go to step 5. If faults are detected, the bleed procedure is aborted; go to next step.

3. If Diagnostic Trouble Codes (DTCs) are present, scantool displays DTCs Present, or list DTCs depending on when DTCs were set. Select F2: DTC CODES to display or clear codes.

4. If DTC code(s) are set, see appropriate DTC Chart under DIAGNOSTIC CHARTS. If bleed procedure was aborted but no DTCs are set, perform system Functional Check.

5. Install Bleeder Adapter (J-35589) to brake master cylinder. Pressurize bleeder to 30 PSI.

6. Have an assistant continuously pump brake pedal, making long, steady strokes. Press U. Place proper size box end wrench over left rear bleeder valve. Attach one end of clear tube over valve and submerge other end in container partially filled with clean brake fluid.

NOTE

While bleeding each circuit, the tester displays and flashes the “TEST IN

PROGRESS” message for up to 2 minutes.

7. Loosen left rear brake valve. Press e. Tighten bleeder valve when prompted by scantool. Press

U

. When the left rear bleed is complete, press U. Repeat Step 6

and this step for right rear caliper.

8. Move to right front caliper, loosen bleeder screw, press E. Have an assistant continuously pump brake pedal, making long, steady strokes. Press U. Press and hold the brake pedal for 10 seconds when prompted (scantool displays a timer). Release the brake when prompted. Wait 10 seconds.

9. Repeat the previous step 3 times. Tighten bleeder screw when prompted. Press U. When the right front bleed is complete, press U. Repeat

Step 8

and this step for left front caliper. Scantool now performs several tests to verify system operation.

10. If scantool displays BLEED PROCEDURE COMPLETE, press U and go to the next step. If faults are detected, remove pressure bleeding equipment and go to

Step 3 .

11. To relieve bleed pressure, press U. Remove pressure bleeding equipment. Ensure brake pedal is high and firm. If brake pedal is not high and firm, re-inspect brake system for leaks or damage. If brake system is okay and pedal travel is still excessive, repeat auto bleed procedure.



$ e u x

The next 3 screens are repeated for each secondary circuit

(RR, LF, RF)

If ABS DTC(S) are present, auto bleed cannot be performed.

SELECT TEST

F3: TCS TEST

F4: AUTO BLEED

LR SECONDARY CKT

BLEED. OPEN LR

BLEED SCREW>


e

DTC(S) PRESENT

FUNCTION CANNOT

BE INITIATED.

u u

BACK TO SELECT

MODE MENU

BLEED BASE BRAKE

SYSTEM. FOLLOW

SERVICE MANUAL

INSTRUCTIONS.

u


1.5 - 2 Minutes

AUTOMATED BLEED

IGNITION SHOULD

BE ON.

[ENTER] TO START.

e


CONNECT REQUIRED

BRAKE BLEEDING

EQUIPMENT.

u u

APPLY BLEED

PRESSURE.

u u

8-10 SECONDS

CLOSE LEFT REAR

BLEED SCREW.

u u

AUTOMATED BLEED

PROCEDURE

COMPLETE.

u u

RELEASE PRESSURE

FROM BLEED

EQUIPMENT.

u u

DISCONNECT

BLEED EQUIPMENT.

PRESS [EXIT]

x

Back to Selection Menu

FIGURE 5-33. F4: Auto Bleed

ACTIVE KEYS

Select AUTO BLEED.

Initiate the bleed procedure.

Increment procedure steps.




MODE F5: TP SENSOR LEARN

MODE F5: TP SENSOR LEARN is for 1996 Y-Car and 1995-1996 D-Cars.

If a new Throttle Position (TP) Sensor or throttle body is installed, the EBTCM must “learn” the TP sensor idle position voltage with the new component(s) installed. This is necessary to ensure effective engine torque reduction during TCS activation.

To select Throttle Position Sensor Learn, do the following:

1. Select F5: TP SENSOR LRN from the Select Mode menu.

2. Press u to acknowledge that you wish to run the TP Sensor Learn procedure. TP SENSOR LEARN IN

PROGRESS is displayed while the TP Sensor Learn function is being performed.

3. If the tester successfully resets the EBTCM, TP SENSOR LEARN COMPLETE is displayed for 4 seconds, then the Select Mode menu is displayed.

If the tester does not accept the TP Sensor Learn command, or if a trouble code is stored, you are instructed to turn the ignition off, then turn it back on. After the ignition is cycled the tester attempts to run the TP Sensor Learn test again. If the process is successful, the tester informs you that TP Sensor

Learn is complete.

If the TP Sensor Learn function is still unsuccessful, the tester informs you either that the TP Sensor

Learn test failed and that you should refer to Section 5E1 of the Service manual, or you are informed that trouble codes are present and to press @ to view the codes. Resolve the cause of the trouble codes then run TP Sensor Learn again.




SELECT MODE

F3: SNAPSHOT

F4: MISC. TEST


TP SENSR LEARN

TO START

u

TP SENSR LEARN

IN PROGRESS

If TP Sensor Learn is unsuccessful.

TURN IGNITION

OFF THEN ON

TP SENSR LEARN

COMPLETE

Trouble Codes Present.

4 Seconds

No Trouble

Codes.

TP SENSR LEARN

IN PROGRESS

TROUBLE CODES

PRESENT PRESS

F2 TO VIEW

CODES

TP SENSR LEARN

FAILED SEE

SERVICE MANUAL

SECTION 5E1

TP SENSR LEARN

COMPLETE

FIGURE 5-34. F5: TP Sensor Learn

4 Seconds

%

@ u x

ACTIVE KEYS

Select TP SENSOR LRN from the Select Mode menu.

Display trouble codes.

Acknowledge that you wish to perform the TP Sensor Learn function.



Bosch 5.0 - VES System 5. Selecting and Operating Test Modes

BOSCH 5.0 - VES SYSTEM

Variable Effort Steering (VES) is available on selected 1992-93 D-and N-Body vehicles and 1992-94 Buick

B-Body vehicles.

The Variable Effort (VE) steering ECU outputs a signal which controls the amount of power steering assist relative to the vehicle’s speed. At low speeds, the power steering assist is increased to improve maneuverability. At higher speeds, the amount of assist is decreased to improve “road feel”.

To do this, the Variable Effort (VE) steering ECU drives a solenoid with a variable duty cycle signal. With the tester, you can display the duty cycle of this signal. A low duty cycle corresponds to a high degree of power assist, while a high duty cycle means a low amount of assist. For 1993 D-Cars you can control the duty cycle while monitoring the feedback current.

MODE F0: DUTY CYCLE TEST

To select Duty Cycle Test, do the following:

1. Press ! from the SELECT SYSTEM menu to test the VES system.

2. Press ) to select the DUTY CYCLE TEST from the SELECT MODE menu.

3. For 1993 D-cars, press u to command the duty cycle to 60%, or press d to command the duty cycle to 0% while monitoring the feedback current.

4. Press X to return to the Select Mode menu.


Bosch 5.0 - VES System


OF VIN CODE

(BODY TYPE):

BCDEHJKLNUVWYZ

B, D or N-Body

SELECT SYSTEM:

F0: ABS/TCS

F1: VES

!

SELECT MODE

F0: DUTY CYCLE

TEST

)

VES ACTUATOR TST

DUTY CYCLE = 46%

X

FIGURE 5-35. Duty Cycle


!

)

U d x


ACTIVE KEYS

Select VES from the SELECT SYSTEM menu.

Select Duty Cycle Test.




Page 182

Bosch 5.0 - RSS/ELC/SWPS System 5. Selecting and Operating Test Modes

BOSCH 5.0 - RSS/ELC/SWPS SYSTEM

After replacement of the RSS control module, the following steps must be performed:

• RSS control module calibration

• Steering sensor trim position adjustment

• Trim height adjustment

NOTE

New RSS control modules must be calibrated after installation. A code

S050 or S051 may be stored in memory of new RSS control modules and does not clear until the module is calibrated.

MODE F0: RSS CALIBRATE

To calibrate the RSS Control Module, do the following:

1. Select RSS Calibrate by pressing ).



4. After calibrating RSS control module, a trim height adjustment procedure and a steering sensor trim position adjustment must be performed.

RSS DTCs

RSS DTCs can be retrieved using the on-board diagnostics available on the vehicle. To enter the diagnostic mode, proceed as follows:

1. Turn the ignition switch to the “ON” position.

2. Push the “OFF” and red (warmer) buttons on the Climate Control Center (CCC) simultaneously and hold until the segment check appears on the instrumental panel cluster.

Segment Check

A segment check is when all lights in the IPC are turned on. The purpose of illuminating the IPC is to verify that all segments of the LED displays are working. Further diagnostics should not be attempted unless all segments appear, as this could lead to misdiagnosis. If any portions or segments of the IPC display are inoperative, diagnose and report this problem first.

To select the RSS System, do the following:

Following the display (flashing) of any trouble codes present, the first available system is displayed. While selecting a system to test, any of the following actions may be taken to control the display:

1. Depressing the fan speed up “

↑

” button on the CCC selects the displayed system for testing.

2. Depressing the fan speed down “

↓

” button on the CCC displays the next available system selection. This allows the display to be stepped through all system choices.



3. Depressing the “OFF” button on the CCC stops the test type selection process and return the display to the next available vehicle system selection.

NOTE

Refer to GM Service Manual for additional information. y

SELECT DESIRED

RSS CALIBRATION

F0: ETC

F1: ELD

SELECT MODE



F2: SWPS

)

ROAD SENSING

SUSPENSION

RECALIBRATION

PRESS [ENTER]

E

ENSURE VEHICLE


LEVEL SURFACE

D

BE SURE ENGINE

IS OFF AND IGN.

KEY IS IN THE

RUN POSITION

D

IS VIN CORRECT?

1G6ET1299SU601797

n

VIN INFORMATION

DOES NOT

MATCH VEHICLE

SEE SERVICE MANUAL


GOOD

RSS CALIBRATION

COMPLETE

BAD

NO RSS DATA

CHECK DLC

MAKE SURE ING. KEY

IS IN RUN POSITION


FROM RSS MODULE

FIGURE 5-36. F0: RSS Control Module Calibration (1995-96 Cadillac with RSS)



MODE F1: ELC TRIM SET

This tester mode is available when testing most 1993-96 E and K body vehicles with Electronic Level

Control (ELC) and Road Sensing Suspension (RSS) systems. Select this mode to set the trim for the vehicle height at the vehicle’s suspension resting position. It requires removing excess weight and entering the fuel level at the time of the trim set.

To select the ELC Trim Set, do the following:

1. Press ! from the RSS SELECT TEST screen to select ELC TRIM SET. Follow the instructions provided on the screen of the tester.

NOTE


2. Vehicle must be on a level surface, with doors closed, and with no passengers or extra weight in car.

3. Check for rear position codes. If codes are present, repair before continuing.

4. Check for RS valves in diagnostics (RSS Data Parameters SD13 and SD14) using the CCC/IPC to be sure they are within range. If not, check for bent RS Brackets or disconnect sensors.

5. Find fuel level reading in IPC (Data Parameters ID40) and round up to the nearest gallon. (Example 12.1 gallons rounds up to 13.0 gallons).

6. Connect scantool to DLC.

7. Key ON engine OFF.

NOTE

Do not sit in vehicle while performing trim height procedure.




SELECT MODE



F2: SWPS

!

ELECTRONIC LEVEL

CONTROL TRIM SET

D

ENSURE VEHICLE


LEVEL SURFACE

D

BE SURE ENGINE

IS OFF AND IGN.

KEY IS IN THE

RUN POSITION

D

READ VEHICLE ON

BOARD DIAGNOSTIC

DATA FOR FUEL

LEVEL. (ID40)

D

ROUND UP FUEL

LEVEL DATA TO THE

NEAREST GALLON

D

ENTER FUEL LEVEL

IN GALLONS

GALLONS 0

PRESS [ENTER]

E

REMOVE EXCESS

WEIGHT FROM

VEHICLE - SEE

SERVICE MANUAL

E

BE SURE IGN. KEY

IS ON AND ENGINE

IS OFF, PRESS


E

TEST IN PROCESS

FIGURE 5-37. F1: Trim Height Adjustment (1995-96 Cadillac with RSS)



MODE F2: SWPS ADJUSTMENT

This tester mode is available when testing most 1995-96 E and K car body vehicles with Electronic Level

Control and RSS systems. Select this mode to set the steering wheel position sensor for electronic chassis control systems such as RSS and ELC.

To select SWPS, do the following:

1. Press @ from the RSS SELECT TEST screen to select SWPS. Follow the instructions provided on the screen of the tester.

2. Check for RSS steering sensor DTC S080 using the CCC/IPC (DTC may vary depending on vehicle). If present, repair before performing steering sensor trim position adjustment.

3. Center steering wheel and verify that the front wheels are straight.

4. Connect scantool to DLC.


6. Check RSS Data parameter SD15 using the CCC/IPC. SD15 must be between 2.0 and 3.0 volts. If outof-range, realign sensor.


NOTE




SELECT MODE



F2: SWPS

@

STEERING WHEEL

POSITION SENSOR

RECALIBRATION

PRESS [ENTER]

E

ENSURE VEHICLE


LEVEL SURFACE

D

BE SURE ENGINE

IS OFF AND IGN.

KEY IS IN THE

RUN POSITION

D

IS VIN CORRECT?

XXXXXXXXX

STRAIGHTEN FRONT

WHEELS SEE

SERVICE MANUAL

D

REMOVE EXCESS

WEIGHT FROM

VEHICLE - SEE

SERVICE MANUAL

D


D

STEERING WHEEL

POSITION SENSOR

RECALIBRATION IS

COMPLETE

FIGURE 5-38. Steering Wheel Position Sensor Adjustment (1995-96 Cadillac with RSS)


Bosch 8.0 - ABS System 5. Selecting and Operating Test Modes

BOSCH 8.0 - ABS SYSTEM

The Bosch 8.0 Antilock Brake System increases directional stability and the “steer-ability” of the vehicle, and provides optimum deceleration in severe braking conditions. The ABS monitors wheel speeds and controls brake line pressure to eliminate uncontrolled skidding.

The Bosch 8.0 ABS system consists of the Electronic Brake Control Module (EBCM), Brake Pressure

Modulator Valve (BPMV), solenoid valves, pump motor, relays, wheel speed sensors, brake booster/master cylinder assembly, and BRAKE and ABS warning lights.

CAUTION!

Once scantool is disconnected, ensure ignition is off at least 10 seconds before road testing vehicle. This allows the system to return to normal

CAUTION



Diagnostic data parameters are monitored by the scantool. The vehicle can be driven while these diagnostic data parameters are being displayed. Intermittent analog signals can be monitored to determine if the signal

varies. Input/output parameter status is also displayed. Please refer to the applicable section in

Common Test

Modes

.

MODE F2: DTCS

Diagnostic Trouble Codes are stored in the ECU memory and can be displayed by the scantool. The ABS

ECU (EBCM) also records ABS status when the DTC was stored. In addition to the DTC number, a brief description of the DTC can be displayed. DTCs can also be cleared from the ECU memory. Please refer to the applicable section in

Common Test Modes

.


The ABS snapshot helps isolate problems of intermittent ABS operation. Information is captured before and after a trigger condition is met. A manual or a DTC trigger can be selected. You will also be allowed to review a stored snapshot from this menu. Please refer to the applicable section in

Common Test Modes

.



Solenoid Test - Pressure Hold

The Solenoid Pressure Hold Mode activates the selected wheel circuit inlet valve placing it in the pressure hold position. When in the pressure hold position, the valve does not allow master cylinder pressure to be delivered to the hydraulic wheel circuit. This is done under actual operating conditions because the EBTCM has determined that the wheel is moving too slowly, so it holds additional master cylinder pressure from it in an attempt to allow it to rotate at an appropriate speed. The scantool commands the valve to close, which


Bosch 8.0 - ABS System 5. Selecting and Operating Test Modes should allow the technician to spin the wheel even though an assistant is applying pressure to the brake pedal.

Solenoid Test - Pressure Release

The Solenoid Pressure Release Mode activates the selected hydraulic wheel circuit valves, placing them in the pressure reduce position. When in the pressure reduce position, the valve allows wheel caliper pressure to be returned to the master cylinder circuit.

This is done under actual operating conditions because the EBTCM has determined that the wheel is moving too slowly, and holding additional master cylinder pressure from it has not allowed it to rotate at an appropriate speed. The scantool commands the valves to these positions which should allow the technician to spin the wheel even through an assistant is applying pressure to the brake pedal.


1. Ignition OFF position.

2. Install scantool.

3. Turn ignition to the RUN position.

4. Raise vehicle such that wheels are about 6 inches off the floor with the transmission in neutral.

5. Have an assistant press and hold the brake pedal.

6. Select SOLENOID TEST from the SELECT TEST menu.

7. Select the Hold or Release command for the wheel position under test. Command the hold or release solenoid “ON” by using the “UP” arrow on the scantool.

8. Attempt to move the wheel being tested by hand; it should move even though the assistant is applying pressure to the brake pedal. The front wheels may be difficult to turn by hand, but can be moved if the system is working properly.



SELECT CONTROL

F0: Solenoid Test

F1: Auto Bleed

)

Put vehicle in park

d

Press [ENTER] to continue

u e

SOLENOID TEST

F0: LF Inlet

F1: LF Outlet

F2: RF Inlet

F3: RF Outlet

F4: LR Inlet

F5: LR Outlet

F6: RR Inlet

F7: RR Oulet

u d

) x

LF Outlet VI Sol

INACTIVE

LF Inlet VI Sol

INACTIVE OFF

LF Outlet VI Sol

INACTIVE

LF Inlet VI Sol

INACTIVE ON

FIGURE 5-39. Example of Submode F0: Solenoid Test

)

) - &

U d e x


ACTIVE KEYS

Select Solenoid Test from SELECT CONTROL menu.

Select inlet or outlet valve to test.

Scroll up through menu, or activate selected solenoid.

Scroll down through menu, or deactivate selected solenoid.

Continue test.

Return to the previous screen or menu.

Page 191



The Auto Bleed procedure is used to provide a complete brake system bleed for the 4-channel Bosch 8.0

ABS system. The Auto Bleed procedure cycles the system valves and runs the ABS pump to purge air from all secondary circuits that are normally closed off during non-ABS mode operations and base brake system bleeding. The Auto Bleed test should be used when it is suspected that air has been introduced into the system's secondary circuits, or when the ABS actuator assembly has been replaced or serviced. Refer to the appropriate vehicle service manual for specific bleeding procedures.


Bosch 8.0 - ABS System

SELECT CONTROL

F

0: Solenoid Test

F1: Auto Bleed

!

Connect required braked bleed

equipment

d

Follow

Service Manual

Instructions

d u e

Raise and support vehicle

d u

Check battery voltage

d u

Open LF bleed screw

d


Turn ign on and engine off

d u


u e d

Pump break pedal continuously

u


d e

Test in Progress

Seconds

Remaining xxx

Close LF bleed screw

Open RF bleed screw

d x

TESTS REPEATS

ABOVE SEQUENCE

FOR REMAINING

BRAKE CIRCUITS.

FIGURE 5-40. Submode F1: Auto Bleed

Lower vehicle and disconnect brake bleed equipment

d u

Check brake fluid level

Fill if necessary

d u

Procedure

Complete

Press [EXIT]

u


Bosch RTD - Real Time Damping System 5. Selecting and Operating Test Modes

BOSCH RTD - REAL TIME DAMPING

SYSTEM

FUNCTION F1: RTD DIAGNOSTICS

Use the Real Time Damping Diagnostics for 1996 Y body vehicles equipped with RTD. This selection provides several test modes for testing and calibrating the RTD system. A list of options available for RTD diagnostics follows:

Mode F0: Data List

Provides a list of parameters related to the Real Time Damping suspension system. All data list functions are available in using the RTD Data List as described in Lamp Sequence Check on

page 311 .

ModeF2: DTCs

Retrieves and clears trouble codes related to the RTD system. The codes are displayed as either “current” or

“history.” Current codes typically cause the SERVICE RIDE CONTROL lamp to be illuminated, and

“history” or intermittent codes are present with the lamp out. After viewing trouble codes, the tester prompts you to clear DTC(s). Simply press the Y key when this is displayed.

Mode F4: OBD Controls

Displays a menu with more RTD diagnostic options:

Submode F0: Damper Test

This test mode allows you to control each damper solenoid manually for diagnostics. Once selected, more options are provided to allow selection of one of 4 dampers or cycle all dampers at once. Select a damper and follow instructions on the screen of the tester.

SELECT DAMPER

F0: LF DAMPER

F1: RF DAMPER

F2: LR DAMPER

F3: RR DAMPER

F4: CYCLE ALL

FIGURE 5-41. Manual Control of Damper Solenoids

Submode F1: System ID

Select this RTD mode to get RTD module information. RTD CONTROLLER and EEPROM ID information are displayed when selected.

The RTD CALIBRATE is made available when testing 1996 Y body vehicles equipped with Real Time

Damping. This function is to be used only when the RTD module has been replaced with a new factory unit.

The mode is only available on convertible Corvettes.


Bosch RTD - Real Time Damping System 5. Selecting and Operating Test Modes

To calibrate RTD, do the following:

1. Press @ from the SELECT SYSTEM menu screen after selecting a 1996 Y-Car.

2. Select the RTD CALIBRATE option by pressing @ and follow the instructions on the screen.

After vehicle selection (1996 Y-car), the following SELECT SYSTEM screen is displayed:

SELECT SYSTEM

F0: ABS/TCS

F1: RTD DIAG.

F2: RTD CALIBRATE

NOTE

Refer to the service manual for information on when to use this function.

FUNCTION F2: RTD CALIBRATE

After replacing any component of the Real Time Damping system, a calibration should be performed.

To calibrate the RTD system, do the following:

1. Select RTD Calibrate by pressing @.


3. Follow user instructions on the scantool screen.

4. Refer to the factory service procedure for more information.


Delco Moraine ABS III 5. Selecting and Operating Test Modes

DELCO ABS SYSTEMS

DELCO MORAINE ABS III

The Delco Moraine Antilock System-III, also known as Powermaster III, is designed to prevent wheel lockup during heavy braking. This provides improved driver control by reducing the distance required to stop vehicle.

The major component parts of the system include: antilock brake controller, 4 wheel speed sensors, 2 dashmounted warning lights, front and rear enable relays and Powermaster-III booster/master cylinder assembly.

The Powermaster-III consists of:

• Hydraulic accumulator

• Electric pump motor

• 3 solenoids

• Pressure switch



MODE F1: DTC HISTORY

DTC HISTORY identifies the following information for Delco Moraine ABS III systems.

• The first five faults displayed in the order in which they occurred. This information can be used to identify situations where an initial fault that was detected no longer remains, but the fault conditions explain the occurrence of a later fault. An example is an intermittent wheel speed sensor which sets code

A048, then further degrades such that no signal is present and now sets code A044.

• How often each of the first five faults have occurred. This information identifies intermittent fault conditions and the degree of intermittence. If a fault occurred 1 out of 35 drive cycles, an unusual condition may have occurred, such as a severe pot hole, that caused the fault. In any case, a fault this intermittent is going to be difficult to locate. Up front, you know special diagnosis techniques are needed to identify the cause. If the fault occurred 10 out of 15 drive cycles, your chances of identifying the fault are much greater and re-creation is probably much easier. Again, you know this before an attempt is made to identify the cause. If the fault occurs every drive cycle, the fault is “HARD” or easy to duplicate. Diagnosis should be easier.

• The last failure that occurred. The last failure that occurred is identified specifically. This fault is what brought the customer in for repair. Additionally, the following information identifies what was happening when the last fault occurred:



• The speed the ABS controller believes the vehicle was going at the time the fault occurred. An unreasonable number here may lead you to suspect wheel speed sensor problems.

• The state of the brake switch at the time of the fault (ON or OFF). This tells you if there was any brake application when the fault occurred. Only the state of the brake switch is known, the brake pedal may have simply been depressed or shorted without any vehicle deceleration.

• The condition of the brake switch circuit. If the brake switch circuit was OPEN, the state of the brake switch may not be accurate and should be discarded. An OPEN does not allow the ABS to operate.

• The status of the system brake pressure. If system pressure was LOW, a leak or a pump problem may exist that adversely affects the braking performance of the system.

• Whether or not the brake had been depressed this ignition cycle. If the brake switch circuit was

OPEN, no brake input is seen. Also, many drivers do not depress the brake when starting the car but do prior to putting the car in gear. If no brake input was seen prior to the fault and the brake switch circuit is OK, this information tells you the fault was probably detected shortly after the ignition switch was turned on.

• Whether or not an ABS stop was in progress when the fault occurred. This may point to a fault caused by additional stresses or vibration the vehicle encountered when in an ABS stop.

Drive Cycles

A drive cycle occurs when the ignition is turned “ON” and the vehicle is driven faster than 10 MPH.

However, if a current code is set, a drive cycle occurs (counter increment) for that code even if 10 MPH is not reached prior to turning off the ignition.

Drive cycles since the last failure occurred. If zero drive cycles have occurred, the customer drove in with the fault detected (ABS Warning Light probably flashing or on continuously). If five drive cycles have occurred, no fault was present when the vehicle arrived for service. If no fault has occurred for 40 drive cycles, and only occurred once based on the intermittent information, the fault may have occurred under unusual circumstances, and a true “fault” may not exist.

NOTE

If no ABS faults have occurred for 50 drive cycles, the ABS controller clears itself of all fault information.

To select DTC History, do the following:

1. Select DTC HISTORY by pressing !.

The tester displays the first failure which occurred, as well as how many times it has occurred over how many drive cycles. After 5 seconds or an U press the same information for the second (or next) failure is displayed.

This is repeated to display information from the first five failures. If fewer failures have occurred, only information from failures that have occurred is displayed.

After the first five (or fewer) trouble codes have been viewed, the tester displays additional information from the most recent failure. Three “pages” are needed to display all of the information about the last failure. These pages automatically sequence at 5 second intervals, or press U to manually sequence through them.

2. Press X to return to the TEST SELECT menu.



SELECT MODE

F0: DATA LIST

F1: DTC HISTORY


!

FIRST FAILURE

CODE 25 WAS SET

1 OF LAST 12

DRIVE CYCLES

5 Seconds or

U

SECOND FAILURE

CODE 14 WAS SET

11 OF LAST 11

DRIVE CYCLES

5 Seconds or

U

LAST FAILURE

CODE 14 WAS SET

AT 0 MPH, THE

BRAKE WAS OFF

5 Seconds or

U

BRAKE PRESSURE

WAS LOW. BRAKE

SWITCH NOT SEEN

THIS IGN. CYCLE

5 Seconds or

U

ABS NOT ACTIVE

THERE HAVE BEEN

0 DRIVE CYCLES

SINCE A FAILURE

5 Seconds or

FIGURE 5-42. Delco Moraine ABS III Code History d u

& x


ACTIVE KEYS

Freeze the display screen.

Unfreeze the display and manually scrolls to the next display.


Return to test selection menu.

Page 198



Trouble codes are set by the IPC or ABS when an abnormal condition is detected. They are the keys to diagnosing many of the problems that can occur in the vehicle. Therefore, you should always check if any trouble codes are set at the beginning of every diagnostic session. You can use the TROUBLE CODE mode to display IPC or ABS trouble codes that have been set by the vehicle. You can also use the TROUBLE

CODE mode to clear the codes set by the IPC or ABS after the codes have been displayed.

To select Trouble Codes, do the following:

1. Select TROUBLE CODES mode by pressing @.

If the Vehicle’s ECM fails to respond to the scantool within 3 seconds, the scantool displays:

NO COMMUNICATION

WITH ECM

** CHECK CABLE **

Under these conditions you should:

• Verify that the ignition is in the “ON” position.

• Check the connection to the Data Link Connector (DLC).

If this message persists, check for a shorted serial data link or faulty ECM.

2. Once data has been received, the scantool displays each code for 3 seconds.Freeze the display by pressing D and advance to the next code by pressing the u.

The scantool displays IPC codes followed by ABS codes. If the IPC or ABS is not installed, the scantool displays “NO IPC DATA” or “NO ABS DATA.”

The ABS controller provides information identifying codes as either current or history codes. A current code is a fault that is currently present in the vehicle, while a history code refers to a fault that is no longer present. The scantool distinguishes between current and history ABS codes by displaying “C” or

“H” after the code number.

ABS Fault Isolation

3. The scantool performs analysis on the codes which are present in the ABS controller and displays information on the most likely cause of the codes. This information is displayed immediately after the

ABS code display has been completed. See Figure 5-43 .

ABS CODE

DISPLAY

* ABS ISOLATION *

MULTIPLE ABS

DIAGNOSTIC

TROUBLE CODES.

4 Secs


POSSIBLE SOURCE

OF FAULT(S)

4 Secs * ABS ISOLATION *

CONSULT SERVICE

MANUAL FOR FAULT

CONFIRMATION


ABS CODES 4, 5, 7

OPEN 10-WAY

CONNECTOR

4 Secs * ABS ISOLATION *

CODES 32, 33, 56

OPEN BRAKE SW,

FUSE, CIRCUITRY

4 Secs TROUBLE CODES

CLEAR ABS CODES?

FIGURE 5-43. ABS Fault Isolation Example (Delco Moraine ABS III)



Code Clearing

4. After all trouble codes and ABS fault messages have been displayed, the scantool prompts you to

“CLEAR CODES?”. If you press N, you leave the TROUBLE CODE mode. If you press Y, the scantool asks you to clear IPC or ABS codes.

5. If you want to clear the IPC trouble codes, press Y in response to the message “CLEAR IPC

CODES?” The scantool then responds with either “IPC CODES CLR’D” or “CODE CLEAR FAIL”.

The scantool displays this message for 3 seconds and then prompts you to clear ABS codes if the upoption ABS is installed. After you have been given the option to clear all codes, the scantool display returns to the SELECT MODE display.

6. If the “CODE CLEAR FAIL” message is displayed, re-enter the TROUBLE CODE mode and try to clear codes again. If it fails again, then you probably have an intermittent connection to the Serial Data

Link (SDL). It is also possible that the controller is malfunctioning.

7. If you attempt to clear ABS trouble codes, the following message is displayed on the scantool:

DISPLAY ENHANCED

DIAG. DATA? LOST

IF CODES CLEARED

“NO” TO CLEAR

This gives you the opportunity to examine more information that the ABS controller has saved about the

ABS trouble codes. Pressing y causes the scantool to enter the “DISPLAY ENHANCED ABS

DIAGNOSTIC INFORMATION” mode. Pressing n causes ABS codes to be cleared.



SELECT MODE

F0: DATA LIST

F1: DATA MONITOR


@ x

TROUBLE CODES


Less than

1 second

TROUBLE CODES

NO IPC DATA

n

3 Seconds

TROUBLE CODES

ABS CODE A007 C,

REAR RELAY CNTS

OPEN, FUSE OPEN

3 Seconds

TROUBLE CODES

ABS CODE A048 H,

RF WHEEL SPEED

JITTER TEST

3 Seconds

TROUBLE CODES

CLEAR CODES?

Y

TROUBLE CODES


N

Y

Indicates

Current code

Indicates

History code

Display enhanced diagnostic info.

(Refer to ABS Tests)

DISPLAY ENHANCED

DIAG. DATA? LOST

IF CODES CLEARED.

“NO” TO CLEAR

N

Y

TROUBLE CODES

ABS CODES CLEARED

X

FIGURE 5-44. Trouble Codes Display and Clearing y , n d u x


ACTIVE KEYS

Determine what codes to clear.



Terminate trouble code display.

Page 201



The ABS snapshot helps isolate problems of intermittent ABS operation. Information is captured before and after a trigger condition. The manual and automatic trigger can be selected. You will also be allowed to review a stored snapshot from this menu. Please refer to the applicable section in common test mode descriptions.

MODE F4: ABS TESTS

SELECT MODE

F3: ABS SNAPSHOT

F4: ABS TESTS

$

SELECT ABS TEST

F0: MANUAL CNTRL

F1: AUTO BLEED

F2: HYDRL. CNTRL

F3: PUMP MOTOR

F4: ABS VERSION

#

FIGURE 5-45. Delco Moraine ABS III Test Menu

PUMP MOTOR TESTS

F0: RUN CYCLE

F1: TOTAL TIME

F2: LEAK DOWN

F3: CYCLES W/O

BRAKE APPLY

F0: MANUAL CONTROL: The manual relay and solenoid control function allows you to turn the ABS solenoids and relays ON and OFF and monitor feedback from them.

F1: AUTO BLEED: The solenoid bleed and check-out test automatically sequences through solenoids actuation to allow the removal of air internal to the Powermaster III hydraulic unit.

F2: HYDRAULIC CONTROL: The hydraulic functional check allows testing of the ABS brake hydraulic channels by allowing brake pressure HOLD and RELEASE functions to be manually controlled.

F3: PUMP MOTOR: The following functions allow you to test the pump motor.

• F0: RUN CYCLE: Measures the time that the ABS pump is on.

• F1: TOTAL TIME: When the ignition is turned on, measures the time it takes for the ABS pressure to reach an acceptable level, and the time before the pump shuts off.

• F2: LEAK DOWN: Provides a means of measuring Powermaster III internal leakage and accumulator precharge.

• F3: CYCLES WITHOUT BRAKE APPLY: Counts the number of pump runs without the brake being applied and measures the time interval.

F4: ABS VERSION: The ABS Version function displays data about which version of the ABS controller is installed in the vehicle.



Submode F0: Manual Relay and Solenoid Control

This feature allows you to control the ABS solenoid enable relays and solenoids for the purpose of trouble shooting. Opens, shorts to ground, and shorts to battery can be confirmed by comparing what is commanded by the tester, what the ABS controller sees as the response (solenoid feedbacks), and what the actual output is at the solenoid. Solenoids are automatically turned off if left on for more than 60 seconds and must cool before being turned back on. An “INHIBITED” message is displayed if additional cooling time is required.

To select Manual Relay and Solenoid Control, do the following:

1. Select the ABS TESTS by pressing $ from the Select Mode menu.

2. Press ) to select the MANUAL RELAY AND SOLENOID CONTROL test.

3. A display confirming that you have entered the “MANUAL CONTROL OF ENABLE RELAYS AND

SOLENOIDS” is shown for 4 seconds, or until the U key is pressed.

4. A screen explaining which tester keys are used to control the various relays and solenoids is displayed until you press Y. The display changes to the Select Solenoid menu.

5. You can select any of six hold or release solenoids by pressing the function key to the left of the solenoid. Selecting # allows you to look at the state of the ABS warning light.

• ): Left Front Hold Solenoid

• !: Right Front Hold Solenoid

• @: Rear Hold Solenoid

• #: ABS Warning Light

• $: Left Front Release Solenoid

• %: Right Front Release Solenoid

• ^: Rear Release Solenoid

6. Once a specific solenoid is selected, use the U key to turn the solenoid on and the D key to turn it off.

You can also toggle the state of the enable relays by pressing E.

The tester displays the commanded state of the solenoid along with the state of the feedback from the solenoid (did the solenoid respond to the command). The tester also displays the current state of the enable relays.

If you selected the ABS Warning Light (#), the tester displays the commanded state for the light along with the state of the enable relays.

7. You can select a new solenoid (or the ABS Warning Light) without returning to the “SELECT

SOLENOID” menu by pressing the appropriate function key. The solenoid you were controlling is turned off automatically.

8. Press X to return to the SELECT SOLENOID menu ( Step 7 ). Press X again to return to the

SELECT TEST menu.

NOTE

If a solenoid is turned ON and not turned OFF for 60 seconds, the tester automatically turns it off. A cool down period of up to 30 seconds is provided after a solenoid is turned off. If you try to turn the solenoid back on before this time expires, you see an “INHIBITED” message display on the top line of the tester. You cannot turn the solenoid on until

“INHIBITED” goes away.



SELECT ABS TEST


F1: AUTO BLEED


MANUAL CONTROL

OF ENABLE RELAYS

AND SOLENOIDS

4 Seconds or

u

= TURN SOL. ON

= TURN SOL. OFF

ENTER = RLY ON/OFF

YES TO CONTINUE

y

SELECT SOLENOID:

F0: LF HOLD

F1: RF HOLD

F2: REAR HOLD

3 Seconds

)

LF HOLD SOLENOID

CMD STATE: OFF

FDBK STATE: LOW

ENAB RELAYS: ON

#

$

)

F3: ABS LITE CMD

F4: LF RELEASE

F5: RF RELEASE

F6: REAR RELEASE

$

LF RELEASE SOL.

CMD STATE: OFF

FDBK STATE: HIGH

ENAB RELAYS: ON

ABS WARNING LITE

LIGHT CMD: OFF

ENAB RELAYS: ON

FIGURE 5-46. Manual Relay and Solenoid Control



)

!

@

#

$

%

^

Y

U

D

E

X

ACTIVE KEYS IN THE DISPLAY PHASE

Select left front hold solenoid.

Select right front hold solenoid.

Select rear hold solenoid.

Select ABS Warning Light.

Select left front release solenoid.

Select right front release solenoid.

Select rear release solenoid.

Continue to Manual Relay and Solenoid tests.

Used to turn solenoid ON.

Used to turn solenoid OFF.

Used to turn relays ON and OFF.

Return to ABS TEST menu.




This feature is designed to remove air from internal Powermaster III brake fluid chambers after

Powermaster III service. This test automatically cycles the solenoids in such a manner that air is removed from the Powermaster III. During this time, pedal feel can be used to diagnose solenoid problems, pump output problems, and pedal feel complaints. The final phase of this test releases brake pressure from each hydraulic channel, one at a time, allowing you to identify pedal travel problems, solenoid leakage, or internal Powermaster III problems.

NOTE

Performing the Autobleed procedure bleeds only the solenoids contained in the Powermaster III Unit, not the base brake system or brake lines. Refer to GM Service Manual for additional information.

To select Auto Bleed, do the following:


2. Press ! to select AUTO BLEED.

A message confirming that you have selected the SOLENOID BLEED AND CHECKOUT TEST is displayed for 4 seconds.

3. A message instructing you to “DEPRESS BRAKE PEDAL HALFWAY, THEN PRESS ’YES’ TO

START CYCLING” is displayed until Y is pressed. Press Y to start the test.

The tester automatically turns various solenoids ON and OFF for specific periods of time. An asterisk in the lower right corner of the display flashes on when a solenoid is being commanded on.

The solenoid bleed and checkout test takes approximately 70 seconds to complete. After the entire sequence is complete, the “END OF TEST” message is displayed on the tester.

If you remove your foot from the brake pedal, the test is terminated.

4. Press X at the completion of the test or at any time during the test to terminate the test and return to the SELECT TEST menu.


Delco Moraine ABS III 5. Selecting and Operating Test Modes y x

SOLENOID BLEED

AND CHECKOUT

TEST

4 Seconds or

u

DEPRESS BRAKE

PEDAL HALFWAY

THEN PRESS "YES"

TO START CYCLING

Y

IF BRAKE PEDAL

NOT DEPRESSED

BRAKE MUST BE

DEPRESSED

TO START CYCLING

APPROX.

70 Seconds

PEDAL

DEPRESSED

"*" FLASHES

DURING TEST

SOL BLEED


*

IF BRAKE RELEASED

SOL BLEED

"END OF TEST"

x

SOL BLEED TEST

"FOOT REMOVED"

FROM BRAKE PEDAL

** TEST ENDED **

x

RETURN TO ABS

TEST SELECTION

FIGURE 5-47. ABS Solenoid Bleed and Checkout Test

ACTIVE KEYS

Acknowledgment of brake pedal being depressed half way.

Terminate test and return to Select ABS test menu.



Submode F2: Hydraulic Control

This feature allows you to control the ABS solenoids for the purpose of hydraulic trouble shooting.

Hydraulic functions are checked by commanding the solenoid or solenoid pair associated with a particular hydraulic channel ON. This allows you to confirm mechanical functioning of the solenoids, leaking of the solenoids, and the overall ability of the Powermaster III to perform the antilock function by turning the wheels by hand with the vehicle on a hoist.

To select Hydraulic Control, do the following:


2. Press @ to select HYDRL. CNTRL (the ABS HYDRAULIC FUNCTIONAL CHECK test) and a test description is displayed.

3. A “FOLLOW SERVICE MANUAL” prompt is displayed. Press U to continue the test.

4. A menu of the functions listed below is displayed. Press the number to the left of the function you wish to check.

NOTE

When performing a HOLD on the front channels, a RELEASE is first commanded for 2 seconds.

FUNCTION

F0: LEFT FRONT HOLD

F1: RIGHT FRONT HOLD

F2: REAR AXLE HOLD

F4: LEFT FRONT RELEASE

F5: RIGHT FRONT RELEASE

F6: REAR AXLE RELEASE

HOLD

SOLENOID

ON

ON

ON

ON

ON

ON

RELEASE

SOLENOID

OFF (AFTER 2 SEC)

OFF (AFTER 2 SEC)

OFF

ON

ON

ON

5. Use the U and D keys to control the solenoids in the same manner as the MANUAL RELAY AND

SOLENOID CONTROL test.

NOTE

The solenoids are automatically turned off if left on for more than 60 seconds and must cool before being turned on again. An “INHIBITED” message is displayed if additional cooling time is required.

6. Press X to return to the SELECT FUNCTION ( Step 4 ). Press X again to return to the ABS

TEST selection menu.



SELECT ABS TEST


F1: AUTO BLEED


@

ABS HYDRAULIC

FUNCTIONAL TEST

4 Seconds or

u

** IMPORTANT **

FOLLOW SERVICE

MANUAL STEPS TO

DIAGNOSE-press

u

SELECT FUNCTION:

F0: LF HOLD

F1: RF HOLD

F2: REAR HOLD

3 Seconds

SELECT FUNCTION:

F4: LF RELEASE

F5: RF RELEASE


)

LEFT FRONT HOLD

= ON = OFF

HOLD CMD: OFF

RELEASE CMD: OFF

)

$

L FRONT RELEASE

= ON = OFF

HOLD CMD: OFF


$

!

RIGHT FRONT HOLD

= ON = OFF

HOLD CMD: OFF


FIGURE 5-48. Hydraulic Function Check



Submode F3: Pump Motor

Submode F0: Monitor Normal Pump Run Cycle

This test allows you to identify the amount of time required to recharge the accumulator under normal operating conditions (from approximately 2200 psi to 2700 psi). This time period is dependent on the accumulator pressure switch settings, accumulator precharge, pump motor output, and vehicle voltage. The vehicle service manual identifies acceptable pump run times. The tester identifies excessive pump run times

(greater than 30 seconds) by displaying an “EXCESSIVE PUMP RUN TIME” message.

To select Pump Motor, do the following:


2. Select PUMP MOTOR tests by pressing #.

3. Press ) to select RUN CYCLE.

4. If pump is running, the tester displays the “WAIT FOR PUMP TO STOP” message. If you see this message, wait until the “DEPRESS BRAKE UNTIL PUMP RUNS” message is displayed.

5. When the “DEPRESS BRAKE UNTIL PUMP RUNS” message is displayed, depress the brake pedal and wait for the “PUMP RUNNING” message to be displayed.

When the pump stops running, the “PUMP OFF” message is displayed along with the “**REPEAT**” message. The time for the first pump run is displayed on the tester.

6. Repeat

Step 5

. When the pump stops again, the time for both runs is displayed.

7. Press X to return to the PUMP MOTOR TEST menu.



MONITOR NORMAL

PUMP RUN CYCLE

TIME (PUMP ON

UNTIL PUMP OFF)

4 Seconds or

u

PUMP RUN TIMER

**PUMP RUNNING**

WAIT FOR PUMP

TO STOP

PUMP STOPS

DEPRESS BRAKE

UNTIL PUMP RUNS

<PUMP OFF>

PUMP RUNS

REMOVE FOOT FROM

BRAKE PEDAL

<PUMP RUNNING>

xx.x

PUMP STOPS

DEPRESS BRAKE

UNTIL PUMP RUNS

<PUMP OFF>

** REPEAT **

PUMP RUNS

REMOVE FOOT FROM

BRAKE PEDAL

<PUMP RUNNING>

xx.x

PUMP STOPS

PUMP RUN #1

9.6 SECONDS

PUMP RUN #2

12.2 SECONDS

x

FIGURE 5-49. Monitor Normal Pump Run Cycle Test x

ACTIVE KEY

Terminate test and return to the PUMP MOTOR TEST menu.



Submode F1: Monitor Total Pump Run Time

This test allows you to monitor the time required to recharge the accumulator from zero psi to maximum system pressure. This information comes in two parts, (1) The time required to recharge the accumulator from the time the ignition key was turned on (“K-ON”) until the red “BRAKE” warning light goes out (“OK

PRESS.” approximately 1800 psi), and (2) The time required to recharge the accumulator from the point at which the red “BRAKE” warning light goes out (“OK PRESS.”) until maximum system pressure is reached and the pump turns off (approximately 2700 psi). This information assists in the identification of improper accumulator switch points, low pump output, and Powermaster III internal leakage.

NOTE

Because the timer starts when the ignition key is turned on, it is extremely important that the Powermaster III be completely pumped down. Follow the directions on the reservoir lid and be sure the brake pedal is HARD before beginning the test. The tester identifies excessive pump run times

(greater than 60 seconds) by displaying an “EXCESSIVE PUMP RUN

TIME” message.

To select Pump Run Time Test, do the following:


2. Select PUMP MOTOR test by pressing #.

3. Press ! to select MONITOR TOTAL PUMP RUN TIME TEST.

4. If ignition is ON, turn the key OFF for at least 5 seconds.

5. With the key OFF, pump down Powermaster III until pedal is hard, then turn ignition ON.

The tester automatically measures the time from the ignition being turned on to the minimum acceptable brake pressure, and then measures the time until the pump shuts off.

6. Press X to return to select PUMP MOTOR TEST menu.


Delco Moraine ABS III 5. Selecting and Operating Test Modes x

MONITOR TOTAL

PUMP RUN TIME

(0 PRESS. TO MAX

SYSTEM PRESSURE)

4 Seconds or

u

PUMP PWR UP TEST

TURN IGN. OFF &

WAIT 5 SECONDS

IGNITION TURNED OFF

WITH KEY OFF,

PUMP DOWN PM-III

UNTIL PEDAL HARD

THEN TURN KEY ON

KEY TURNED ON

K-ON TO OK PRESS

xx SECONDS

PRESSURE OK


12 SECONDS

OK PRESS. TO OFF xx SECONDS

PUMP STOPS

TIME FROM

IGNITION ON TO

BRAKE WARNING

LIGHT OUT


12 SECONDS

OK PRESS. TO OFF

9 SECONDS

x

TIME FROM

WARNING LIGHT

OUT TO PUMP OFF

RETURN TO ABS

TEST SELECTION

FIGURE 5-50. Monitor Total Pump Run Time Test

ACTIVE KEY

Terminate test and return to the PUMP MOTOR TEST menu.



Submode F2: Leak Down Check

POWERMASTER III BLEED DOWN CHECK WITH BRAKE PEDAL DEPRESSED (DELCO

MORAINE ABS III)

This test monitors the Powermaster III while the brakes are applied (brake pedal depressed). When a pump run is detected, the running timer stops. The time required to initiate this pump run can be directly related to accumulator precharge and internal leakage. A pump run within 30 seconds results in a message indicating that further testing is required with a pressure gauge. A pump run that occurs after 30 seconds but before 60 seconds results in a displayed time that can be correlated to a leak down acceptability chart found in the service manual. If the pump does not run within 60 seconds, the test ends with no leakage identified.

NOTE

If the brake pedal is released during the test, the test ends.

To select Leak Down Test, do the following:


2. Select PUMP MOTOR tests by pressing #.

3. Press @ to select LEAK DOWN test.

4. If pump is running, wait for pump to stop.

5. When pump stops, depress brake pedal until pump motor runs.

6. When pump runs, remove foot from brake pedal and wait for pump to stop.

7. When pump stops again, depress brake pedal with moderate force and hold it steady for the remainder of the test.

8. Tester displays the elapsed time until the pump runs or until 60 seconds have elapsed, whichever comes first.

9. Tester displays the results.

10. Press X to return to PUMP MOTOR TEST menu.



POWERMASTER III

BLEED DOWN CHECK

WITH BRAKE PEDAL

DEPRESSED

4 Seconds or

u

PUMP RUNNING

PUMP NOT

RUNNING

PUMP MOTOR IS

RUNNING - WAIT

UNTIL PUMP MOTOR

STOPS RUNNING

PUMP STOPS

PUMP RUNS

BEFORE 30 Seconds

CHECK

ACCUMULATOR

PRECHARGE

SEE SERV. MANUAL

DEPRESS BRAKE

PEDAL UNTIL

PUMP MOTOR RUNS

PUMP RUNS

< PUMP RUNNING > remove foot from brake DO NOT

REAPPLY BRAKES

PUMP STOPS

DEPRESS BRAKE

PEDAL WITH

MODERATE FORCE

AND HOLD STEADY

BRAKE APPLIED

ELAPSED TIME

WITH NO PUMP

RUN DETECTED: xx SECONDS

PUMP RUNS AFTER

30 to 60 Seconds

PM III BLEED

DOWN: PUMP OFF

FOR xx SECONDS

BEFORE PUMP RUN

x

BRAKE PEDAL WAS

RELEASED BEFORE

THE PUMP RAN -

TEST IS INVALID

PUMP DOES NOT RUN

WITHIN 60 Seconds

PM III DID NOT

BLEED DOWN FAR

ENOUGH TO CAUSE

PUMP TO RUN

6 Seconds

IF BRAKE WAS

FIRMLY DEPRESSED

NO TROUBLE FOUND

RETURN TO ABS

TEST SELECTION

FIGURE 5-51. Bleed Down Check with Brake Pedal Depressed x

ACTIVE KEY

Terminate test and return to PUMP MOTOR TEST menu.



Submode F3: Cycles without Brake Apply

MONITOR THE NUMBER OF PUMP RUNS WITH NO BRAKE APPLY

This test monitors the Powermaster III and identify any pump runs that occur without the brake being applied. Because of the no leak down design of the Powermaster III, loss of accumulator pressure sufficient to cause the pump motor to run can only be caused by (1) Depleting the pressure by applying the brakes, or

(2) Internal or external Powermaster III leakage. This test identifies the number of pump motor runs during the running timer. If the pump motor runs even once within 20 minutes, the cause of the pump run should be determined. Consult the service manual.

NOTE

If the brake pedal is applied during this test, the test ends.

To select Cycles without Brake Applied Test, do the following:


2. Select the PUMP MOTOR test by pressing #.

3. Press # to select the CYCLES W/O BRAKE APPLY test.

4. Depress the brake pedal until the pump motor runs, then release pedal.

Pump runs until accumulator is fully pressurized and then shut off. DO NOT DEPRESS BRAKE

PEDAL AFTER PUMP SHUTS OFF.

The tester displays the number of pump runs and the total elapsed time. This test can be run for as long as four hours.

5. Press X to return to PUMP MOTOR test menu.


Delco Moraine ABS III 5. Selecting and Operating Test Modes x

MONITOR NUM. OF

PUMP RUNS WITH

NO BRAKE APPLY

(POSS. CODE 56)

4 Seconds or

u

WITH IGNITION ON

DEPRESS BRAKE

UNTIL THE PUMP

MOTOR RUNS

BRAKE DEPRESSED

<PUMP RUNNING>

"RELEASE BRAKE"

IF BRAKE PRESSED

TEST WILL END

PUMP STOPS


**LEAVE IGN ON**

TIME: xx:xx

PUMP TURNS ON

IGN TURNED OFF


PUMP RUNS: 1

TIME: xx:xx

PUMP RAN @ xx:xx

BRAKE IS DEPRESSED

**TEST ENDED**

NO ABS DATA

PRESS TO

SEE TEST RESULTS

u

**TEST ENDED**

BRAKE DEPRESSED

PRESS TO

SEE TEST RESULTS

u

**TEST RESULTS**

PUMP RUNS: x

TIME: xx:xx

PUMP RAN @ xx:xx

x

RETURN TO ABS PUMP

TEST SELECTION

FIGURE 5-52. ABS Spurious Pump Run Test

ACTIVE KEY

Terminate test and return to PUMP MOTOR test menu.



Submode F4: ABS Version

This feature is provided to identify the ABS controller version and the ABS software ID and sequence number without having to access or remove the ABS controller.

NOTE

The software ID is not related to a PROM version in the ABS controller.

The ABS controller has NO serviceable or removable PROM. The ID and sequence number are for controller identification purposes only.

To select ABS Version, do the following:


2. Select the ABS VERSION function by pressing $.

The tester displays the Delco Moraine ABS controller version number for approximately 4 seconds.

The tester then displays the SOFTWARE ID and SEQUENCE number for the ABS controller for approximately 4 seconds.

The tester continuously alternates between displaying the controller version number and displaying the

SOFTWARE ID/ SEQUENCE.


SELECT ABS TEST

F3: PUMP MOTOR

F4: ABS VERSION

$

DELCO MORAINE

ANTILOCK BRAKE

SYSTEM -- 2000

GM-10 VER 1.0

4 Seconds

ABS CONTROLLER

SOFTWARE ID: xxxx

SEQUENCE: xxxx

4 Seconds

FIGURE 5-53. Display ABS Version x

ACTIVE KEY

Terminate test and return to SELECT ABS TEST menu.


Delco ABS VI (UART) 5. Selecting and Operating Test Modes

DELCO ABS VI (UART)

Delco ABS VI system uses electric motors to modulate displacement pistons. The ABS hydraulic modulator assembly is mounted on the master cylinder/vacuum booster assembly. The modulator contains 3 electric motors, which control pistons for braking pressure regulation. Major components of the Delco ABS VI system include hydraulic modulator, 4 wheel speed sensors, ABS enable relay, 2 or 3 dash-mounted warning lights and Electric Brake Control Module (EBCM).

Each motor drive gear operates a threaded shaft assembly attached to a pressure-modulating piston. The motor drives a piston up and down to increase and decrease brake line pressure, respectively. When the

EBCM senses wheel lock-up from wheel speed sensors, a solenoid, located in the hydraulic modulator, closes the hydraulic path from the master cylinder. The electric motor for that brake circuit then cycles the piston up and down to modulate braking force, preventing wheel lock-up.

WARNING LAMPS

Amber ANTILOCK or ABS INOP Warning Light: With ignition ON, a flashing amber “ANTILOCK” or ABS INOP warning light indicates problem exists in ABS system, but system is still operational. If the amber “ANTILOCK” or ABS INOP warning light remains on steadily, problem has affected ABS operation and antilock function is disabled.

Amber LOW TRAC Warning Light: With ignition ON, Amber LOW TRAC warning light comes on during braking when ABS is functioning, warning driver of slippery road conditions. LOW TRAC warning light stays on approximately 4 seconds after ABS stops warning.

Red BRAKE Warning Light: With ignition ON, a red “BRAKE” warning light indicates following possible problems: fluid level in master cylinder reservoir is low, parking brake switch is closed, or bulb test circuit of ignition switch is closed. Red “BRAKE” warning light also comes on if problems exists in base brake system.

Intermittent Service Indicator Lamps: Intermittent “SERVICE ABS” or “SERVICE TCS” indicator lamp operation may indicate low system voltage. These lamps remain lit (and ABS/TCS is disabled) as long as system voltage is low.





MODE F1: DTC HISTORY

DTC history identifies the following information for Delco ABS VI (UART) systems.

First Five (or Fewer) Failures

The first five faults are displayed in the order in which they occurred. This information can be used to identify situations where an initial fault that was detected no longer remains, but the fault conditions explain the occurrence of a later fault.

The first page of information displays how often each of the first five faults have occurred. The second page informs you how many drive cycles have occurred since the code was last set.

This information identifies intermittent fault conditions and the degree of intermittence. If a fault occurred 1 out of 35 drive cycles, an unusual condition may have occurred, such as a severe pot hole, that caused the fault. In any case, a fault this intermittent is going to be difficult to locate. Up front, you know special diagnosis techniques are needed to identify the cause. If the fault occurred 10 out of 15 drive cycles, your chances of identifying the fault are much greater and re-creation is probably much easier. Again, you know this before an attempt is made to identify the cause. If the fault occurs every drive cycle, the fault is considered a “HARD” code or is easy to duplicate. Diagnosis should be easier.

Last Failure

The last failure that occurred is identified specifically. This fault is what brought the customer in for repair.

Additionally, the following information identifies what was happening when the last fault occurred:

• The first screen of information about the last failure indicates the speed the ABS controller believes the vehicle was going at the time the fault occurred. An unreasonable number here may lead you to suspect wheel speed sensor problems.

The status of the brake switch at the time of the fault (OFF or ON). This tells you if there was any brake application when the fault occurred. Only the state of the brake switch is known, the brake pedal may have simply been depressed or shorted without any vehicle deceleration.

• The second screen of information about the last failure displays the status of the brake telltale at the time of the fault (ON or OFF), and whether or not the brake had been depressed this ignition cycle. If the brake switch circuit was OPEN, no brake input is seen. Also, many drivers do not depress the brake when starting the car but do prior to putting the car in gear. If no brake input was seen prior to the fault and the brake switch circuit is OK, this information tells you the fault was probably detected shortly after the ignition switch was turned on.

Also on the second screen is whether or not the vehicle has been driven at a speed greater than 25 MPH during this ignition cycle and whether or not an ABS stop was in progress when the fault occurred. This may point to a fault caused by additional stresses or vibration the vehicle encountered when in an ABS stop.

• The third screen tells the code set and how many drive cycles since this code set.

Drive Cycles

A drive cycle occurs when the ignition is turned “ON” and the vehicle is driven faster than 10 MPH.

However, if a current code is set, a drive cycle occurs (counter increment) for that code even if 10 MPH is not reached prior to turning off the ignition.



NOTE

If no ABS faults have occurred for 100 drive cycles, the ABS controller clears itself of all fault information.

To select DTC History, do the following:

1. Select DTC HISTORY from the SELECT MODE menu by pressing !.

2. The tester displays two screens of information about the first failure which occurred. The first page indicates how many times the failure has occurred over how many drive cycles. The second screen tells how many drive cycles have occurred since it was last set.

The screens automatically sequence at a five second interval. Press U to manually sequence through the screens or D to stop the sequencing.

3.

Step 2 is repeated to display information from the first five failures. If fewer failures have occurred, only

information from failures that have occurred is displayed.

4. After the first five (or fewer) trouble codes have been viewed, the tester displays additional information from the most recent failure. Three screens are needed to display all of the information about the last failure as shown in the flow chart on the following page. These screens automatically sequence at 5 second intervals, or press U to manually sequence through them or D to freeze the display.

In the sample flow chart on the following page, the first failure (code 27) demonstrates an intermittent fault that was the first code set, but it hasn’t occurred for the past 14 drive cycles. The second failure of the flow chart demonstrates a “hard” fault that is currently present since there have been 0 drive cycles since it occurred and it occurred on 5 of the last 5 drive cycles. In the example, the last failure is the same as the second failure, since only two failures had occurred. It is also possible for the last failure to be the same as the first because the first is an intermittent problem and could possibly cause another trouble code to be set after the second failure has been set.




SELECT MODE

F0: DATA LIST

F1: DTC HISTORY

F2: TROUBLE CODE

!

FIRST FAILURE:

CODE 27 WAS SET

1 OF LAST 14

DRIVE CYCLES

5 Seconds

FIRST FAILURE:

CODE 27 WAS LAST

SET 14 DRIVE

CYCLES AGO

5 Seconds

SECOND FAILURE:

CODE 42 WAS SET

5 OF LAST 5

DRIVE CYCLES

5 Seconds

SECOND FAILURE:

CODE 42 WAS LAST

SET 0 DRIVE

CYCLES AGO

5 Seconds

FIGURE 5-54. F1: DTC History

LAST FAILURE:

CODE 42 WAS SET

AT 55 MPH, THE

BRAKE WAS ON

5 Seconds

BRAK T-TALE ON

BRAK SW SEEN

SPEED > 25 MPH

& ABS NOT ACTIVE

5 Seconds

WHEN CODE XXX

WAS LAST SET.

THERE HAVE BEEN

XXX DRIVE CYCLES

5 Seconds

SINCE THIS LAST

FAILURE. REPAIR

VEHICLE PRIOR TO

CLEARING CODES

!

&

D

U

X

DELCO ABS VI (UART) ACTIVE KEYS

Select DTC HISTORY from the SELECT MODE menu.


Manually scroll the display.

Stop the display from sequencing.




MODE F2: DTCS

Trouble codes are stored in the ECU memory and can be displayed in the scantool. The ABS ECU also records when the DTC was stored and the ABS status. In addition to the DTC number, a brief description of the DTC can be displayed. DTCs can also be cleared from the ECU memory. Please refer to the applicable section in common test mode descriptions.


SELECT MODE

F3: ABS SNAPSHOT

F4: MISC. TESTS

$

SELECT ABS TEST


F1: MODULATOR


F3: EMB TEST

F4: MOTOR TEST

F5: GEAR TEN REL

F6: RELAY TEST

F7: VOLTAGE LOAD

F8: LAMP TEST

F9: ABS VERSION

FIGURE 5-55. Delco ABS Test Menu

F0: MANUAL CONTROL: This test allows you to manually control ABS actuators including the Enable

Relay, EMBs, Solenoids and Motors.

F1: MODULATOR: In this test you are guided through the automated mechanical diagnosis of the modulator by prompts on the tester screen.

F2: HYDRAULIC CONTROL: The hydraulic functional check allows testing of the ABS brake hydraulic channels by automatically sequencing through RELEASE, HOLD, and APPLY functions on the channel you select.

F3: EMB TEST: The Electromagnetic Brake test applies motor current to act against the EMBs. If an

EMB is not able to properly hold the motor, the brake pedal moves.

F4: MOTOR PACK TEST: Once the motor pack has been separated from the ABS hydraulic modulator, the Motor test guides you through an automated ABS Motor Pack test.

F5: GEAR TENSION RELIEF: Gear Tension Relief allows you to relieve tension from the motor gears in order to allow the motor pack to be separated from the modulator assembly.

F6: RELAY TEST (UART Only): This test allows you to test the Enable Relay while displaying the ABS relay battery voltage. This allows verification of relay operation.

F7: VOLTAGE LOAD TEST or MOTOR TEST: The Voltage Load test allows you to check the battery for adequate capacity for ABS operation. Appropriate messages are displayed that indicate any required area of service.

F8: LAMP TEST: Allows manual control of ABS amber warning lamp circuit, red brake telltale circuit and amber ABS Active or TCS lamp if equipped.



F9: ABS VERSION or SYSTEM ID: The ABS or TCS Version function displays data about the vehicle’s ABS Controller.

The submodes listed above are described in the following submode section.

Submode F0: Manual Control

The Manual Control functions allow you to manually control each motor, EMB, and solenoid for component diagnosis. The enable relay can also be controlled. You can turn the solenoids and enable relay on and off, turn the ABS motors on and off and control their direction (apply or release), and command the

Electromagnetic Brake (EMB) mechanism to Hold or Release. Opens, shorts to ground, and shorts to battery can be confirmed by comparing what is commanded by the tester, what the ABS controller sees as a response (motor feedbacks), and what the actual output is at the actuator. When the motor is moving the feedback current is less than the command current. When the piston is at the top or bottom of the bore or stuck, the feedback current is equal to the command current. The solenoids and EMBs are automatically turned off if left on for more than 30 seconds and must cool before being turned back on. The motors are automatically turned off after 5 seconds. An “INHIBITED” message is displayed on line 1 if additional cooling time is required.

To select Manual Control Test, do the following:

1. Select OBD CONTROLS by pressing $ from the Select Mode menu.

2. Press ) to select the Manual Control Test.

3. A display confirming that you have entered the Manual Control test is displayed for four seconds, or until the U key is pressed.

4. A screen explaining which tester keys are used to control the various functions is displayed until you press the Y key. If data is being received from the ABS controller, the display changes to the function selection menu. If no data is received from the ABS controller the tester informs you. In this case, press X to return to the Select ABS Test menu. Check the tester and DLC cable connections, then press ) to try to perform the Manual Control test again.

5. The function selection menu displays all of the functions which you can control in this test along with the function key () - () to press to select this function.

Note that the top row of function keys () - #) control tests for the Left Front functions. The next row of function keys ($ - &) control the same functions for the Right Front wheel. Rear wheel components are controlled by function keys on the bottom row (* and (). Also, the selection is arranged so the first key in a row controls motor apply, the second key controls motor release, the third key controls solenoids, and the fourth key controls EMB Release.

LF

RF

REAR

MOTOR

APPLY

F0

LF APPLY

F4

RF APPLY

F8

REAR APPLY

MOTOR

RELEASE

F1

LF RELEASE

F5

RF RELEASE‘

F9

REAR RELEASE

SOLENOID

F2

LF SOLENOID

F6

RF SOLENOID

EMB

F3

LF EMB

F7

RF EMB



NOTE

Selections @, #, ^, &, *, and ( do not apply to vehicles with Traction Control.

6. Once you have selected a function to test, use the U key to turn function ON and the D key to turn function OFF. Pressing E toggles the enable relay ON and OFF.

If you are testing a 1991 N-body, the following message is displayed the first time you press E.

Drive the vehicle and then stop it to initialize the ABS system.

DRIVE VEHICLE.

ALL FOUR WHEELS

MUST BE >4 MPH

AT THE SAME TIME

7. To select a different function to test you can either press X to return to the FUNCTION SELECT menu to choose a different test, or just press the function key for the test you want to perform.

NOTE

Some vehicles equipped with DELCO ABS VI do not use Electromagnetic

Brakes (EMBs). Therefore, the F3 and F7 functions are not available for these vehicles and are not shown in the Function Selection menu.

8. Press X to return to the Manual Control test menu. Press X again to display the Select Test menu.

NOTE

When you exit from the Manual Control test, the tester rehomes the motors and displays a message informing you that the motors have been rehomed.

)

) ( u d e y x

ACTIVE KEYS

Select MANUAL CONTROL test.

Select function to control.

Turn function ON.

Turn function OFF.

Turn enable relay ON and OFF.

Continue Manual Control test.




SELECT TEST


F1: MODULATOR


)

MANUAL CONTROL

OF ENABLE RELAY,

EMB, SOLENOIDS,

AND MOTORS

= TURN ON

= TURN OFF

ENTER = RLY ON/OFF

YES TO CONTINUE

y

MAN SOL. TEST


FROM ABS CNTRLR

Select

Function

Menu

F0: LF APPLY

F1: LF RELEASE

F2: LF SOLENOID

F3: LF EMB

F4: RF APPLY

F5: RF RELEASE

F6: RF SOLENOID

F7: RF EMB

F8: REAR APPLY


) x

LF MOTOR APPLY

COMMAND: 10 AMPS

FEEDBACK: 10 AMPS

ENAB RELAY: ON

Note: LF EMB and RF EMB

functions are only

available for J/L/N

vehicles.

Enable Relay is ON

e e

LF MOTOR APPLY

COMMAND: 10 AMPS

FEEDBACK: 0 AMPS

ENAB RELAY: OFF

Enable Relay is turned OFF

FIGURE 5-56. Manual Control



Submode F1: Modulator Test

NOTE

The Modulator Test is not used on 1994-1995 vehicles. This test does not apply to vehicles with Traction Control.

The Modulator test is an automated diagnostic test of the mechanical components of the brake modulator system on select GM vehicles. The tester guides you through the steps by displaying prompts for action on the tester display screen. You perform the requested action (e.g., pressing or releasing the brake pedal), then inform the tester of the results by pressing the Y, N, or U key. The tester displays an “

↑

” or “YES/

NO” on the bottom line as an indication of the type response needed. At the end of the test steps, the tester displays the results of the tests. If a component fails the test, rerun the test to verify the failure before replacing the component.

If you make a mistake and press the wrong key when answering YES/NO questions, press the X key to return to the Select ABS Tests menu and perform the test again from the start. Incorrect responses to the

YES/NO questions causes invalid test results. If conflicting data is received by the tester due to incorrect responses, the tester directs you to repeat the test.

END OF DIAGNOSIS

PRESS “ENTER”

FOR RESULTS

End of test display

MODULATOR TEST

PASSED FOR ALL

COMPONENTS

All systems passed

LEFT FRONT

RESULTS

INCONCLUSIVE.

REPEAT TEST.

Conflicting data display

LEFT FRONT

SOLENOID DOES

NOT OPEN.

REPLACE SOLENOID

MOTOR/EMB STUCK.

REMOVE MOTOR

PACK ––– SEE

SERVICE MANUAL.

Examples of component failure displays.

RIGHT FRONT

MOTOR WIRES

REVERSED. REPAIR

AS NECESSARY.

To select Modulator Test, do the following:


2. Press ! to select the MODULATOR TEST.

3. The tester display confirms that you are in the Automated ABS Modulator Mechanical Diagnosis test.

The display automatically scrolls after four seconds, or after pressing the U key.

4. If the parking brake is on, the tester tells you to release it. If the parking brake is released within 10 seconds the tester automatically continues to the SELECT CHANNEL menu.

If the parking brake is not released within 10 seconds, or if the red telltale light remains on even when the parking brake is released, the tester instructs you to release the parking brake or correct the cause of the red telltale staying on. When the problem is resolved, the tester displays the SELECT CHANNEL

Menu.

5. The tester displays instructions that prepare the vehicle to be tested. Follow the instructions displayed by the tester, then press U to continue.



6. After the vehicle is prepared, the tester asks you a series of questions and requests that you perform certain actions (such as pressing on the brake pedal). Answer the questions and confirm that you have performed the actions by pressing the Y or N keys.

NOTE

To help prevent damage to ABS components, the tester terminates the

Modulator Test if more than 45 seconds elapse between actions.

7. After all tests have been performed, press E to view the test results. The tester tells you whether all components passed, if some components failed, or if the test results were inconclusive. If any components failed, or if the tests are inconclusive, rerun the Modulator Test to verify the results.


NOTE

When you exit from the Modulator test, the tester rehomes the motors and displays a message informing you that the motors have been rehomed.



SELECT TEST


F1: MODULATOR


!

AUTOMATED ABS

MODULATOR

MECHANICAL

DIAGNOSIS

4 Seconds or

DEPRESS BRAKE

PEDAL FIRMLY.

BRAKE OFF

If parking brake and/or red telltale are on.

RELEASE

PARKING

BRAKE

If more than

10 seconds.

RELEASE PARKING

BRAKE OR CORRECT

CAUSE OR RED

BRAKE TELLTALE

BE SURE ENGINE

IS OFF AND IGN.

KEY IS IN THE

RUN POSITION.

u

When problem is fixed.

PUMP BRAKES

UNTIL VACUUM

RESERVE IS

DEPLETED.

u

THE LEFT FRONT

CHANNEL WILL

BE DIAGNOSED

FIRST.

u

FIGURE 5-57. Modulator

DOES THE BRAKE

PEDAL SINK

TOWARDS FLOOR?

(YES/NO)

Tester guides you through the ABS

Modulator Test.



FOR RESULTS

!

U y , n e x

ACTIVE KEYS

Select MODULATOR TEST.

Advance the screen after performing requested action.

Reply to questions about the results of actions that tester has asked you to perform.

View the results of the Modulator test.

Return to the SELECT TEST menu.



Submode F2: Hydraulic Control Test

CAUTION!

CAUTION

To perform the following test, both vehicle drive wheels must be securely raised or unintended vehicle movement occurs that could injure someone.

NOTE

This test does not apply to vehicles with Traction Control.

This test allows you to manually perform the APPLY, HOLD, and RELEASE ABS functions for brake system diagnosis.

To select Hydraulic Control Test, do the following:


2. Press @ to select the Hydraulic Control Test.

3. The tester display confirms that you are in the ABS Hydraulic Functional Test and instructs you to raise the wheel to be tested. When the wheel has been raised, press U.

4. If the parking brake is on, the tester tells you to release it. If the parking brake is released within 10 seconds the tester automatically continues to the Select Channel menu.

If the parking brake is not released within 10 seconds, or if the red telltale light remains on even when the parking brake is released, the tester instructs you to release the parking brake or correct the cause of the red telltale staying on. When the problem is resolved, the tester displays the Select Channel menu.

5. Choose the wheel you wish to test from the Select Channel menu.

6. When a wheel has been selected, the tester instructs you to place the transmission in neutral, then firmly depress the brake pedal. Do not release the pedal until the tester instructs you to do so.

7. Have an assistant try to spin the wheel selected. It should not spin. This is to verify base brake apply.

8. Press U to start the test. The tester displays “RELEASE” on the screen and your assistant should be able to spin the wheel selected. This verifies ABS brake pressure release. The tester then displays

“HOLD” on the screen and a countdown timer. During this portion of the test, the brake pressure previously released is being held and your assistant should be able to spin the selected wheel. This verifies that the ABS unit can “HOLD” the released pressure and checks for internal leaks. The tester then commands the ABS modulator to “APPLY” (APPLY is displayed on the screen). Your assistant should not be able to spin the wheel selected at this point. This test verifies that the ABS modulator can reapply brake pressure to the selected channel. Refer to the vehicle’s Service Manual for component servicing if a problem is found during this test.

9. At the conclusion of the test, the tester instructs you to take your foot off the brake pedal. When the pedal is released, the tester returns to the beginning of the Hydraulic test. Run the test on another wheel, or press X to return to the SELECT TEST menu.

NOTE

When you exit from the Hydraulic Control test, the tester rehomes the motors and displays a message informing you that the motors have been rehomed.



SELECT TEST


F1: MODULATOR


@

ABS HYDRAULIC

FUNCTIONAL TEST

* ALL WHEELS MUST

BE OFF GROUND.

u

LEFT FRONT

CHANNEL WILL BE

TESTED FIRST.

u

DEPRESS BRAKE

PEDAL FIRMLY AND

KEEP DEPRESSED

BRAKE XXX

DOES LEFT FRONT

WHEEL TURN?

(YES/NO)

y

or

n

DOES LEFT FRONT

WHEEL NOW TURN

FREELY?

(YES/NO)

y

or

n

•

•

•

Test is repeated for Right Front, then Rear Axle.



FOR RESULTS.

If no faults detected.

e

If fault(s) detected.

HYDRAULIC TEST

PASSED FOR ALL

COMPONENTS.

LEFT FRONT

NO APPLY PRESS.

Possible fail messages:

1. NO APPLY PRESS.

2. NO RELEASE

3. NO HOLD

FIGURE 5-58. Hydraulic Control

@ u y , n x

ACTIVE KEYS

Select HYDRAULIC CONTROL test.

Confirm that all wheels are off the ground.

Respond to tester questions.


KEEPING PEDAL

DEPRESSED,

WAIT 10 SECONDS

XX

DOES LEFT FRONT

WHEEL TURN

FREELY?

(YES/NO)

y

or

n

REMOVE FOOT

FROM BRAKE.

BRAKE XXX



Submode F3: EMB Functional Tests

NOTE


This test applies motor current to act against the EMBs on select GM vehicles. If an EMB is not able to properly hold the motor, the brake pedal moves.

To select EMB Functional Test, do the following:


2. Press # to select the EMB FUNCTIONAL Test.

3. The tester display confirms that you are in the Electromagnetic Brake (EMB) test. The display automatically scrolls after four seconds, or after pressing the U key.

4. The tester asks you to prepare the vehicle by turning the engine OFF and then placing the ignition key in the RUN position. Press U when you have performed these actions.

5. After the vehicle is prepared, the tester asks you a series of questions and requests that you perform certain actions (such as pressing on the brake pedal). Answer the questions by pressing the Y and

N

keys.

NOTE

To help prevent damage to ABS components, the tester terminates the

EMB Test if more than 45 seconds elapses between actions.

6. After all tests have been performed, the tester tells you if one or both EMBs passed, if one or both EMBs failed, or if the test was terminated due to the brake pedal being released. If either EMB failed, or if the brake pedal was released, rerun the EMB Test to verify the results.


NOTE

When you exit from the EMB Functional test, the tester rehomes the motors and displays a message informing you that the motors have been rehomed.



SELECT TEST

F3: EMB TEST

F4: MOTOR TEST

F5: GEAR TENSION

#

ELECTROMAGNETIC

BRAKE (EMB)

FUNCTIONAL TEST

PUMP BRAKES

UNTIL VACUUM

RESERVE IS

DEPLEATED.

u

REMOVE FOOT

FROM BRAKE

BRAKE ON/OFF

PRESS “ENTER” TO

INITIALIZE THE

MODULATOR FOR

THE EMB TEST

DEPRESS BRAKE

PEDAL FIRMLY.

BRAKE OFF

DOES THE BRAKE

PEDAL SINK

TOWARDS FLOOR?

(YES/NO)

TECH 1 guides you through the ABS

EMB Tests.


BOTH EMBs APPEAR

TO HOLD MOTORS.

NO TROUBLE FOUND

EMB Passed Condition

LEFT FRONT EMB

SLIPS

REPLACE MOTOR

PACK.

EMB Fault Condition

FOOT REMOVED

FROM BRAKE

DURING TEST

** REPEAT TEST **

Operator Error Message

FIGURE 5-59. EMB Functional Tests

# u y , n x


ACTIVE KEYS

Select EMB TEST (Electromagnetic Brake).

Advance the screen after performing requested action.

Reply to questions about the results of actions that tester has asked you to perform.


Page 233


Submode F4: Motor Pack Test/Motor Test

Once the motor pack has been separated from the ABS hydraulic modulator, the Motor Pack Test functionally tests the motor pack for proper operation. If the motor pack is still attached to the modulator, the tester performs the gear tension relief sequence to allow you to remove it.

CAUTION!

Prior to removing the motor pack from the ABS hydraulic modulator, prevailing motor torque, or gear tension must be removed from the gear

CAUTION

train to ease the motor pack separation process and prevent personal injury.

To select Motor Pack Test, do the following:


2. Press $ to select the MOTOR PACK Test.

3. The tester display confirms that you are in the Automated ABS Motor Pack Diagnosis test. The display automatically scrolls after four seconds, or after pressing the u key.

4. The tester asks if the motor pack has been separated from the modulator. Answer by pressing the Y or N key.

If the answer is YES, the tester asks you to turn the ignition OFF.

If the answer is NO, the tester performs a gear tension relief sequence and then informs you that the sequence has been completed. Press u to scroll to the next screen, which asks you to turn the ignition

OFF. After you turn the key ignition OFF, the tester prompts you to remove the motor pack from the hydraulic modulator assembly. Refer to the service manual for the proper procedure.

The tester prompts you to connect the motor pack wiring to the motor pack. Position the motor pack so that the gears are clear of all objects, and then turn the ignition back ON.

5. The tester guides you through a series of actions to perform and questions to answer. If an

↑

is displayed in the lower right corner of the display, press u after the action is completed to continue to the next page of instructions. If the tester asks a question, answer by pressing the Y, N or E key.

6. After all tests have been performed the tester displays the test results. If the test failed, re-run the Motor

Test to verify the results.


$ u y , n e x

ACTIVE KEYS

Select MOTOR PACK test.

Advance screen after performing requested action.

Indicate whether or not motors turned.

Start motor pack diagnosis.




SELECT TEST:

F4: MOTOR TEST

F5: GEAR TENSION

F6: RELAY TEST

$

AUTOMATED ABS

MOTOR PACK

DIAGNOSIS

4 Seconds or

HAS MOTOR PACK

BEEN SEPARATED

FROM MODULATOR?

(YES/NO)

y n

TURN IGNITION

OFF

Key is turned OFF

GEAR TENSION

RELIEF SEQUENCE

COMPLETED

u

TURN IGNITION

OFF

Key is turned OFF

REMOVE MOTOR

PACK FROM

MODULATOR

ASSEMBLY

u

WITH MOTOR PACK

SEPARATED FROM

MODULATOR

u

CONNECT MOTOR

PACK WIRING TO

MOTOR PACK

u

MAKE SURE MOTOR

GEARS ARE CLEAR

OF ALL OBJECTS

u

TURN IGNITION

BACK ON

FIGURE 5-60. Motor Pack Test/Motor Test


TO START MOTOR

PACK DIAGNOSIS

e

ARE ALL THREE

MOTORS TURNING?

(YES/NO)

y n

ALL THREE MOTORS

APPLY - TO VERIFY

RELEASE, PRESS

“ENTER”

e

ARE ALL THREE

MOTORS TURNING?

(YES/NO)

y n

ALL THREE MOTORS

RELEASE. SEE

SERVICE MANUAL

TO DETERMINE

u

IF MODULATOR

GEARS ROTATE -

REFER TO “NO

GEAR MOVEMENT”

MOTOR OR EMB/ESB

IS DEFECTIVE -

REPLACE MOTOR

PACK

MOTOR OR EMB/ESB

IS DEFECTIVE -

REPLACE MOTOR

PACK



Submode F5: Gear Tension Relief Test

CAUTION!

Prior to removing the motor pack from the ABS hydraulic modulator, prevailing motor torque, or gear tension must be removed from the gear

CAUTION

train to ease the motor pack separation process and prevent personal injury and gear train damage.

NOTE


To select Gear Tension Relief Test, do the following:


2. Press % to select the GEAR TENSION RELIEF Test.

3. The tester confirms that you are in the Gear Tension Relief test. Consult the service manual for pre-test preparations. The display automatically scrolls after four seconds, or after pressing the u key.

4. The tester asks you to press the E key to start the Gear Tension Relief sequence. Press E.

5. The tester informs you when the Gear Tension Relief sequence has been completed. Press u to scroll to the next page of instructions.

6. To finish the test, turn the ignition key OFF, follow instructions on the next screen. Press X after the motor pack is separated from the hydraulic modulator. The tester returns to the SELECT TEST menu.



%

U

E

X

SELECT TEST

F3: EMB TEST

F4: MOTOR TEST

F5: GEAR TEN REL

%

PREPARE ABS

MODULATOR FOR

OFF-VEHICLE

SERVICE

4 Seconds or


START THE GEAR

TENSION RELIEF

SEQUENCE.

e

GEAR TENSION

RELIEF SEQUENCE

COMPLETED.

*IMPORTANT*

u

IGNITION MUST

BE TURNED OFF

BEFORE EXITING.

When key is turned OFF.

IGNITION OFF

REMOVE MODULATOR

PRESS “EXIT” TO

RETURN TO MENU.

FIGURE 5-61. Gear Tension Relief Test

ACTIVE KEYS

Select GEAR TEN REL test.

Scroll to the next page of instructions.

Start the Gear Tension Relief sequence.




Submode F6: Relay Test

The Relay test controls the enable relay while displaying the switched battery voltage into the ABS

Controller. This tests allows verification of relay operation.

NOTE

For 1991 N-Car, the vehicle must be driven at least 4 MPH to allow the system to initialize prior to running this test.

To select Relay Test, do the following:


2. Press ^ to select the RELAY TEST.

3. The tester display confirms that you are in the ABS Enable Relay test. The display automatically scrolls after four seconds, or after pressing the u key.

4. If you are testing a 1991 N-Body, codes 67 or 71 inhibit this test to protect circuits that might otherwise be damaged.

If you are testing a 1991 N-Body, the ABS must be initialized before this test can be performed. This is done by driving the vehicle at least 4 MPH. The tester displays messages to prompt you to do this.

5. The tester displays the keys used to control the Enable Relay, the status of the relay (whether it is commanded OFF or ON), and the current battery voltage as seen by the ABS controller.

6. Use the d key to turn the Enable Relay OFF and the u key to turn the Enable Relay back ON. If the relay is commanded OFF, the battery voltage should drop to below 5.0V within two seconds. If it fails to do this, the tester informs you that the relay contacts appear to be closed. Consult the service manual to make the necessary repairs.




SELECT TEST

F6: RELAY TEST

F7: BATTERY TEST

F8: LIGHT TEST

^

TEST OF ABS

ENABLE RELAY.

Vehicles other than

1991 N-Body.

If you are testing a 1991 N-Body.

4 Seconds or

If code 67 or 71 set.

DRIVE VEHICLE

ALL FOUR WHEELS

MUST BE > 4 MPH

AT THE SAME TIME

TEST CANNOT BE

RUN DUE TO

PRESENCE OF

CURRENT CODE

x

When you drive vehicle.

RELAY TEST

STOP VEHICLE

When you stop vehicle.

RELAY TEST

= ON =OFF

RELAY CMD: ON

BATTERY: 12.9V

d u

RELAY TEST

= ON =OFF

RELAY CMD: OFF

BATTERY: 0.9V

If voltage fails to drop when relay is commanded OFF.

RELAY CONTACTS

APPEAR TO BE

CLOSED – REPAIR

AS NECESSARY

FIGURE 5-62. F6: Relay Test

^ u d x


ACTIVE KEYS

Select RELAY TEST from the SELECT TEST menu.

Turn relay ON.

Turn relay OFF.


Page 239


Submode F7: Voltage Load Test

NOTE


In the Voltage Load test, you can energize many of the ABS components to create a significant current draw. Ignition voltage and ABS battery voltage are then monitored. If one or both voltages drop significantly, appropriate messages are displayed to direct you to the required area or service.

To select Voltage Load Test, do the following:


2. Press & to select the VOLTAGE LOAD Test.

3. The tester display confirms that you are in the ABS Voltage load test. The display automatically scrolls after four seconds, or after pressing the u key.

4. Press the u key to sequence through the three message displays that caution you against abusing or overusing this test.

5. When ABS VOLTAGE TEST is displayed on the tester screen, start the engine and leave the transmission in park/neutral. Press u to continue the test.

6. The tester asks you to press on the brake pedal firmly. Do so and the tester display informs you of the current ABS ignition voltage and the ABS battery voltage. Press u to start the test.

If the Voltage Load test has just been performed, you may have to wait up to 60 seconds for the components to cool before the test can be run again. If you attempt to run the Voltage Load test again too soon, the tester displays a warning and also displays a countdown timer of how long before the test can be run again.

7. The test takes 6 to 10 seconds to complete during which time you must keep the brake pedal depressed.

The tester informs you that the test is in progress. When the tester concludes the test, the results of the tests are displayed.

8. Press X to return to the Select Tests menu.



SELECT TEST

F6: RELAY TEST


F8: LIGHT TEST

&

TEST FOR

ADEQUATE BATTERY

CAPACITY FOR ABS

OPERATION.

4 Seconds or

u

ABS VOLTAGE TEST

* * * IMPORTANT * * *

DO NOT ABUSE

THIS TEST.

u

DAMAGE TO ABS

MODULATOR MAY

RESULT IF TEST

IS OVER-USED.

u

ONLY RUN TEST

WHEN DIRECTED TO

BY SERVICE

MANUAL.

u


START ENGINE;

KEEP IN PARK/

NEUTRAL.

u

DEPRESS BRAKE

PEDAL FIRMLY.

BRAKE OFF

Brake depressed


= START TEST

ABS IGN: 13.4V

ABS BATT: 12.9V

u

If cooling is required

u

SYSTEM MUST COOL

DUE TO HIGH

CURRENT USED!

WAIT XX SECONDS.


IN PROGRESS

ABS IGN: 13.4V

ABS BATT: 12.9V

6-10 Seconds

If brake is released

BRAKE RELEASED

TEST TERMINATED

ABS IGN. & BATT.

VOLTAGES < 10.0V

CHECK VEHICLE

ELECTRICAL SYST.

or


* * * PASSED * * * or

FIGURE 5-63. F7: Voltage Load Test

ABS BATT. INPUT

VOLTAGE < 10.0V

* CHECK SWITCHED

BATT FOR HI RES.

&

U

X


ACTIVE KEYS

Select VOLTAGE LOAD Test from the SELECT TEST menu.

Advance the tester display after performing a requested action.


Page 241



The Lamp test allows you to manually control two or three ABS Lamps for diagnostic purposes. Different vehicles allow control of different Lamps, and ABS VI provides feedback for some Lamps but not for others. The tester displays the list of Lamps for the vehicle you are testing.

Figure 5-64

is for the 1993 F-

Body.



2. Press * to select the LAMP Test.

3. The tester display confirms that you are in the ABS LAMP Test. The display automatically scrolls after four seconds, or when you press the u key.

4. A Select Lamp menu is displayed. Press the key (), !, @) that corresponds to the Lamp you want to test. The example is for the Red Brake Lamp.

Use the u and d keys to turn the Lamp ON and OFF (or flash). The commanded state of the Lamp is displayed on line 3 and depending on the Lamp, the feedback state may be displayed on line 4.

5. Press X to return to the SELECT LAMP menu, or press X twice to return to the SELECT

TEST menu.



SELECT TEST

F6: RELAY TEST


F8: LAMP TEST

*

MANUAL CONTROL

OF ABS LAMPS.

4 Seconds or

u

SELECT LAMP

F0: ABS INOP LP

F1: RED BRAKE LP

F2: LOW TRAC LP

!

RED BRAKE LIGHT

= ON =OFF

COMMAND: OFF

FEEDBACK: OFF

u d

RED BRAKE LIGHT

= ON =OFF

COMMAND: ON

FEEDBACK: ON

FIGURE 5-64. Example of 1993 F-Body

) , !

, @ u d x

ACTIVE KEYS

Select the Lamp you want to test from the SELECT LAMP menu.

Turn the selected Lamp ON.

Turn the selected Lamp OFF.

Return to the SELECT LAMP menu. Press X twice to return to the SELECT TEST menu.



Submode F9: ABS Version/System ID

This feature allows you to identify the ABS system, the ABS version, Electronic Brake Control Module

(EBCM) manufacturing and calibration information without having to access or remove the EBCM.

Software ID selection is not available for printing using the F8: PRINT function. However, Print Screen mode is available.

NOTE


The ABS controller has NO SERVICEABLE OR REMOVABLE prom.

The ID and sequence number are for controller identification purposes only.

To select ABS Version, do the following:


2. Press ( to select the ABS VERSION or SYSTEM ID.

3. The tester displays information about the Delco Chassis Division ABS controller on three tester screens.

• System identification screen

• Model year, platform and ABS version number screen

• Software identification screen

This information may be referenced by service manuals or service bulletins. It can be used to determine that the correct ABS controller is installed in the vehicle. It may also be used for warranty purposes.

4. The tester continuously scrolls through the three screens at 4 second intervals. The display can be frozen by pressing the d key and unfrozen by pressing the u key.



Delco ABS VI (UART)

SELECT TEST

F9: ABS VERSION

(

DELCO CHASSIS

DIV. ANTILOCK

BRAKE SYSTEM VI

Example for

1991 N-Car

4 Seconds or

u

DCD ABS-VI

1991

N-CAR

VERSION 1.0

4 Seconds or

u

PROM ID: 6312

DATE CODE: 5200

SEQUENCE #: 4672

CALIB. ID: 9999

4 Seconds or

FIGURE 5-65. ABS Version


( u d x

ACTIVE KEYS

Select ABS VERSION from SELECT TEST menu.

Manually scroll the display screen.

Freeze the display screen.




MODE F5: MOTOR REHOME

This test is only available for F, S, U, W and Z-vehicles equipped with Delco ABS VI systems without

Traction Control.

This feature allows you to command the ABS motors to drive the pistons to the home position at the top of each bore for the purpose of bleeding the secondary ABS circuits. Systems with the function, “BLEED

PREP”, do not offer the Motor Rehome function.

To select Motor Rehome Test, do the following:

1. Select MOTOR REHOME by pressing ! from the SELECT MODE menu. The tester does not perform a motor rehome if the vehicle is moving, if certain codes are set, or if the brakes are applied.

The tester informs you that the motors are being rehomed.

2. “MOTOR REHOME COMPLETE” is displayed when the motors are rehomed, then the tester returns to the SELECT MODE menu.



SELECT MODE

F3: SNAPSHOT

F4: ABS TESTS

F5: MOTOR REHOME

Ignition below 10.5V

Ignition above 10.5V

BE SURE ENGINE

KEY IS IN THE

RUN POSITION

10 seconds

Ignition above 10.5V

SWITCHED IGN

LESS THAN 10.5V

AT ECBM. REPAIR

AS NECESSARY

Wheels turning

x

Wheels stopped

Brake depressed

TEST CANNOT BE

RUN WHILE

VEHICLE IS

MOVING

x

REMOVE FOOT

FROM BRAKE.

x

Brake released

Codes present

MOTOR REHOME

COMMANDED.

REHOMING MOTORS

3 Seconds

MOTOR REHOME

COMPLETE

3 Seconds

ABS DIAGNOSTIC

TROUBLE CODE(S)

PRESENT. MOTOR

REHOME CANNOT BE

3 Seconds

PERFORMED.

REPAIR AS

NECESSARY– SEE

SERVICE MANUAL

x x

FIGURE 5-66. Motor Rehome



MODE F6: BLEED PREP

The BLEED PREP function is available only on DELCO ABS-VI systems that have ABS/TCS with the

UART Protocol. According to the factory GM Service Manual, this procedure must always be performed prior to bleeding a DELCO ABS-VI brake system. The procedure is broken into two parts. First, the

BLEED PREP function returns all of the hydraulic modulator pistons to their “home” positions. This allows all hydraulic circuits inside the modulators to be open to adequately bleed the system. Second, it cycles the

TCS modulator to move any trapped air in the modulator to the top of the unit so that it can be removed during the bleeding process.

The BLEED PREP function is available only for 1996 through 1998 DELCO ABS-VI (UART) systems that have ABS/TCS with the UART Protocol.

To select Bleed Prep, do the following:

1. From the ABS/TCS or SELECT MODE screen, press ^ to begin the bleed prep procedure.

2. Follow the instructions provided on the screen of the tester.

NOTES

• Do not perform the BLEED PREP function if there are DTC(s) present.

• Always refer to the appropriate service manual before performing any

ABS diagnostics or repairs.

Bleeding Tips

After any hydraulic component service, bleeding the system is required. Pressure bleeding is the preferred bleeding method, although manual bleeding can be used as an alternative. It is essential that you always follow the Service Manual procedures.

The bleeding procedure on Delco ABS VI with Traction Control is a two-step “BLEED PREP” sequence using the MTS 3100. The first step homes the ABS and traction control modulator pistons.

THIS FUNC TIO N IS

USED TO PREPARE

THE ABS/TC S SYS.

FO R B LEEDING.

TURN IG NITION

O FF

A BS/TCS M O TO R

R EHO M E CO M M A NDED

R EHO M ING M O TO RS

R EFER BACK TO

SERVICE M ANU AL

TO C ONT. BLEED

PRO CEDURE

A BS/TCS M O TO R

R EHO M E CO M PLETE.

DO NO T PRO CEED

UNTIL INSTRUCTED

TO DO SO BY THE

SERVICE M ANUAL

FIGURE 5-67. Preparing ABS/TCS for Bleeding

Then, after an initial system bleed, the second step of the “BLEED PREP” cycles the traction control modulator four times to remove any trapped air bubbles in it.



TURN IGNITION

ON

TCS MODULATOR

INITIALIZATION

COMPLETE.


INITIALIZE THE

TCS MODULATOR

FOR BLEEDING.

INITIALIZING

TCS MODULATOR.

REFER BACK TO

SERVICE MANUAL

TO CONT. BLEED

PROCEDURE.

FIGURE 5-68. Initializing TCS Modulator

The service manual and scantool procedures must be followed as the traction control modulator does not have bleeder screws as found on the ABS modulator.

When done bleeding, check the fluid level in the reservoir and fill it, if necessary.

e u x

ACTIVE KEYS

Start a procedure as prompted.

Step through procedures.

Exit to the SELECT MODE menu.


Delco ABS VI (Class 2) 5. Selecting and Operating Test Modes

DELCO ABS VI (CLASS 2)



MODE F2: DTCS





Submode F0: Manual Control

This test is described in the Delco VI (UART) section of this manual (See

Submode F0: Manual Control on page 224.

).

Submode F1: Hydraulic Control

This test is used to verify base brake apply and ABS release, hold, and apply functions. During testing, if a problem is encountered, the tester aborts the test and displays the diagnostic trouble code.

To perform the Hydraulic Control Test, do the following:

1. Turn the ignition off.

2. Raise the wheels to be tested.

3. Install the tester.

4. Turn the ignition switch to the RUN position.

5. Press $ to select OBD CONTROLS from the menu.

6. Press ! to select Hydraulic Control from the OBD CONTROLS menu.

7. The tester display confirms that you are in the ABS Hydraulic Control Test and instructs you to raise the wheel(s) to be tested.



8. Select the wheel to be tested.

9. When a wheel has been selected, the tester instructs you to place the transmission in park. Then, firmly depress the brake pedal. Do not release the pedal until the tester instructs you to do so.

10. Have an assistant attempt to rotate the wheel being tested. If the wheel does not rotate, the base brake apply is working properly.

11. With the brake pedal still depressed, press u on the tester to start the test. a. The tester displays “RELEASE” on the screen and the assistant should be able to spin the wheel. This verifies the ABS brake pressure release. b. The tester then displays “HOLD” on the screen and a countdown timer. During this portion of the test the hydraulic circuit is being held open and the assistant should be able to spin the selected wheel.

This verifies that the ABS unit can “HOLD” the released pressure and checks for internal leaks. c. The tester then commands the ABS modulator to “APPLY” (APPLY is displayed on the screen). The assistant should not be able to spin the wheel selected at this point. This test verifies that the ABS modulator can reapply brake pressure to the selected channel.

NOTE

When you exit from the Hydraulic Control test, the tester rehomes the motors and displays a message informing you that the motors have been rehomed.


Delco ABS VI (Class 2)

TRANSMISSION IN

PARK/NEUTRAL.

FIRMLY DEPRESS

BRAKE PEDAL.

LEFT FRONT

RELEASE


RAISE WHEEL(S) TO

BE TESTED.

PRESS (ENTER)

)

F0: LEFT FRONT

F1: RIGHT FRONT

F2: REAR AXLE

!

TRANSMISSION IN

PARK/NEUTRAL.

FIRMLY DEPRESS

BRAKE PEDAL.

@

RIGHT FRONT

RELEASE

TRANSMISSION IN

PARK/NEUTRAL.

FIRMLY DEPRESS

BRAKE PEDAL.

REAR AXLE

RELEASE

LEFT FRONT

HOLD

RIGHT FRONT

HOLD

REAR AXLE

HOLD

LEFT FRONT

APPLY

RIGHT FRONT

APPLY

NO DIAGNOSTIC

TROUBLE CODE(S) SET.

“TEST COMPLETE”

PRESS [EXIT]

FIGURE 5-69. Hydraulic Control

!

) @ u e x


ACTIVE KEYS

Select HYDRAULIC CONTROL test.

Select channel to test.

Scroll up through the menu.

Continue test.


REAR AXLE

APPLY

Page 252


Submode F2: Motor Test

The ABS Motor Test available on 97-99 Saturns, allows the user to command the antilock brake modulator pistons to their Pistons up (home) or Pistons down (release) positions.

The ABS modulator pistons are normally at their Pistons up (home) position when the antilock brake system is not in operation. The pistons must be in the Pistons up (home) position to bleed the rear brakes.

To release gear tension from the ABS modulator, use the tester to perform the Pistons down (release) selection.

CAUTION!

CAUTION

Refer to the appropriate service manual for complete procedures and cautions when performing the Pistons down (release) procedure.

CAUTION!

CAUTION

Do not drive or operate the vehicle with the ABS brake control assembly in the Pistons down (released) position. Always perform the Pistons up

(home) before driving the vehicle.

To perform the Motor Test, do the following:

1. Turn the ignition ON (motor not running).

2. Press F0: PISTONS UP HOME to bleed rear brakes (and after any pump motor repair).

3. Press F1: PISTONS DOWN REL. to remove tension from drive gear or pump motor pack.


Delco ABS VI (Class 2)

* CAUTION *

SEE BRAKE

SERVICE MANUAL

BEFORE CONTINUING.


IGNITION ON

ENGINE OFF

MOTOR TEST

F0: PISTNS UP HOME

F1: PISTNS DN REL.

!

)

TEST IN

PROGRESS

REHOMING

MOTORS

GEAR TENSION

RELIEF SEQUENCE

COMPLETED

IMPORTANT

RUN PISTONS UP

HOME BEFORE

DRIVING VEHICLE

FIGURE 5-70. Motor Test

ABS MOTOR

REHOME

COMMANDED

[EXIT]

)

!

e x


ACTIVE KEYS

PISTONS UP HOME

PISTONS DOWN REL.

Continue test.


Page 254


Submode F3: Gear Tension

Gear Tension Relief Sequence

When the displacement cylinder pistons are in their up-most position, each motor has prevailing torque due to the force necessary to ensure each piston is held firmly at the top of its travel. This torque results in gear tension, or force on each gear that makes motor pack separation difficult. To avoid injury, or damage to the gears, the gear tension relief function briefly reverses each motor to eliminate the prevailing torque.

Always perform the gear tension relief function prior to removing the hydraulic modulator or motor pack from the vehicle.

Submode F4: Relay Test

The test allows monitoring the voltage available to the EBCM while turning the Electronic Brake Relay ON and OFF.

When the relay is commanded ON, the voltage should be equal to battery voltage. When the relay is OFF, the voltage should drop below 5 volts.

NOTE

Voltage does not drop to zero when the relay contacts are open due to capacitors in the EBCM. If the voltage drops below 5 volts, the relay is operating properly.

Submode F5: Voltage Load

The Delco VI ABS system can draw significant amounts of current when operating. This test runs on many of the system components to load-test the vehicle’s electronic system.

If low voltage malfunctions or intermittent EBCM operations are occurring, this test allows you to monitor two separate power circuits for ABS: ignition and battery. If only one of these two inputs drops below 10 volts during testing, a high resistance may be present in that power feed circuit.

Submode F6: Motor Rehome

The motor rehome function returns all of the hydraulic modulator pistons to their up-most home position.

This allows all fluid paths within the modulator to be open so that the modulator can be properly bled. The motor rehome function must ALWAYS be used prior to bleeding the brake system.

NOTE

The motor rehome function cannot be performed if any current DTCs are present; the vehicle must be repaired and DTCs cleared before performing the motor rehome function.

Submode F8: System ID

This feature allows you to identify the ABS system, the ABS version, Electronic Brake Control Module

(EBCM) manufacturing and calibration information without having to access or remove the EBCM.



System selection is not available for printing using the F8: PRINT function. However, Print Screen mode is available.

NOTE


The ABS controller has NO SERVICEABLE OR REMOVABLE prom.

The ID and sequence number are for controller identification purposes only.

To select System ID, do the following:


2. Press * to select the System ID.

3. The tester displays information about the Delco VI ABS controller on three tester screens. a. System identification screen b. Configuration ID and data code c. PROM ID and build sequence number

This information may be referenced by service manuals or service bulletins. It can be used to determine that the correct

ABS controller is installed in the vehicle. It may also be used for warranty purposes.

4. The tester continuously scrolls through the three screens at 4 second intervals. The display can be frozen by pressing the d key and unfrozen by pressing the u key.


SELECT TEST

F8: SYSTEM ID

(

DELPHI ABS VI

PRESS ENTER

TO CONTINUE

PROM ID: 6312

DATE CODE: 5200

SEQUENCE #: 4672

CALIB. ID: 9999

y

/

n

keys scroll through system information

FIGURE 5-71. System ID

( e y , n x

ACTIVE KEYS

Select ABS VERSION from SELECT TEST menu.

Continue to next screen.

Scroll through system information.



ABS Warning Lamp 5. Selecting and Operating Test Modes

DBC 7

The DBC 7 is a combined Antilock Braking (ABS) and Traction Control System (TCS). The DBC 7 system has the following features:

• Integrated Hydraulic Control Unit (HCU) and Electronic Controller.

• HCU that uses solenoids and a pump.

• Positive pedal feedback during ABS braking events.

Instead of motors and gears, the DBC 7 system utilizes eight solenoids to control brake pressure to the wheels. The entire brake pressure modulator valve assembly (BPMV), motor, and electronic brake control unit or electronic brake and traction control unit (EBCM/EBTCM) are mounted together as a single assembly.


The amber warning lamp is located in the instrument panel. This warning lamp may be illuminated by the

ABS only. The lamp and lamp circuit are tested when switching the ignition from OFF to RUN, which performs the bulb check.

The EBCM/EBTCM warning lamp in the I/P cluster is activated by a Class 2 signal from the EBCM/

EBTCM. When the EBCM/EBTCM decides that the ABS should be inhibited, a “turn on warning lamp”

Class 2 message is sent by the EBCM/EBTCM. The I/P cluster picks up the message and supplied a ground to the lamp driver to activate the ABS lamp. The lamp remains off as long as the system operates normally.

The lamp is illuminated by the EBCM/EBTCM of a current ABS DTC is stored, or if EBCM/EBTCM loses power or ground. When poor power or ground connection is located and repaired, ABS coded and several

Class 2 communication codes can be cleared and system can be re-tested.

The EBCM constantly monitors the ABS/TCS/TIM/MSVA systems and sets Diagnostic Trouble Codes

(DTCs) if any system is operating outside of preset operating limits.

The DBC 7 system is designed so that ABS failures do not cause the standard red brake warning lamp to illuminate.

SMART CLUSTER

The “smart cluster” operates the instrument panel and allows for fail safe operation of the amber ABS warning lamp. The smart cluster illuminates the amber ABS warning lamp when a “lamp on” message is received from the EBCM/EBTCM. The lamp also is illuminated if the Class 2 state of health message from the EBCM/EBTCM is lost.

A “Lamp on” message can be caused by an ABS DTC, a loss of EBCM/EBTCM power or ground, or Class

2 wiring fault that results in no communication.


Low Trac Lamp 5. Selecting and Operating Test Modes

LOW TRAC LAMP

The Low Trac Lamp is found on some vehicles with the DBC 7 ABS system. The Low Trac telltale is illuminated during a traction control event. The Low Trac lamp is a traction control active light.

TCS

Traction Control System (TCS) works a little differently than Electronic Traction Control System (ETS).

ETS sends a torque reduction percentage request to the PCM. The TCS has a hard wire with a PWM signal that runs between the PCM and the EBTCM. Based on that information, the EBTCM gives the PCM a requested torque. The PCM returns with the reduction in torque that it plans to deliver, known as delivered torque. The EBTCM has embedded diagnostics that detect whether or not the requested torque reduction is being delivered. If not, the EBTCM could set a DTC in the PCM or in the EBTCM.

The TCS talks to the PCM over a dedicated PWM line and also over a Class 2 line.

Thermal modeling is another parameter that the TCS uses to decide of the TCS should be engaged or not.

Thermal modeling is an algorithm in the EBTCM that estimates brake rotor temperature. If drive time, speed, and the number of deceleration events add up to a specified value, the TCS is shut down until the brakes cool off. While the TCS is OFF, a Trac light is illuminated. ABS functions are still maintained; there is no degradation in ABS performance.

ETS WARNING LAMP

The amber TRAC OFF warning lamp is illuminated during the bulb check and also is illuminated if the ETS is disabled. The amber LOW TRAC lamp illuminates when ETC is active, and does not illuminate when

ABS is active.

Some vehicles have a Trac Off switch to disengage the ETS. ETS can be disengaged by using one of the following methods:

• Selecting Drive range D2 or D1. This is useful when the vehicle is stuck in the mud or snow.

• Set the parking brake to the first click. This is useful when performing and emission test when the car must be run on a dynamometer. Setting the parking brake tells the EBCM to avoid ETS for the current ignition cycle.

SELF TEST

At the beginning of every ignition cycle, the system tests itself for proper operation. The DBC 7 unit checks all of the electronics, actuates all the solenoids, and runs the pump motor to ensure that the system is ready for use. This self-test is performed every time the engine is started.


Tire Inflation Monitor (TIM) System 5. Selecting and Operating Test Modes

The DBC 7 system uses three possible methods to initialize.

• If the driver’s foot is off the brake pedal as the engine is cranked, the system is initialized immediately.

The sound of the engine cranking is louder than the initialization noise. Therefore, it is very difficult to notice the ABS initialization noise.

• If the driver’s foot is on the brake pedal and the car is moving less that 10 mph, and the foot is taken off the brake pedal, the system is initialized. Noise from a moving vehicle tends to mask initialization noise.

• If the driver’s foot is on the brake pedal as the car exceeds 10 mph, the system initializes at 10 miles per hour. Noise from a moving vehicle tends to mask initialization noise.

The driver may hear a momentary pump motor and solenoid clicking type noise and may feel brake pedal movement if the foot remains on the brake pedal. The driver also may perceive a slight loss of braking performance if the car is moving down a sloped driveway as the brake is being applied.

TIRE INFLATION MONITOR (TIM) SYSTEM

The TIM system looks at wheel speed information from the wheel speed sensors, interprets that information, and then compares the rolling radius of each tire. The system is looking for differences over a period of time. If the system sees a wheel speed difference from one wheel, it then illuminates the low tire light. Typically, the system switches on the low tire light when a tire is down by 12 psi. It is not possible to identify two low tires at the same time.

The tire inflation monitor system uses wheel speed sensor information to calculate what the value of the air pressure is in a particular tire. A difference of 12 psi does not affect ABS performance, so a low tire does not cause the ABS light to be illuminated. Diagnostics look for jitters or variations, in wheel speed that really does not match what the wheel should be doing, and illuminates the ABS light in that particular case. TIM diagnostics do not affect the operation of the ABS light.

The EBCM/EBTCM contains the TIM software. TIM begins working as soon a the vehicle is driven. An auto-learn sequence must be completed for combining approximately three different speed ranges. TIM calibrates itself for each tire.

Typically, TIM requires about half an hour, depending on the driving conditions, to train the algorithm in the EBCM/EBTCM. The characteristics of each individual tire are different. Each tire has a slightly different set of revolutions per kilometer (RPK). The system must calibrate itself to match each tire.

If a low tire light is illuminated, check tire pressures. If the tire pressure is low, fill the tire to the recommended pressure. Then, locate the reset switch inside the passenger door area fuse panel. Press and hold the reset switch for three to five seconds. When the low tire light flashed, release the switch. The low tire light stops flashing and goes out.

The auto-learn process must be repeated. If the tires are rotated, if the pressure is change, or if a different tire is installed, the system must be reset. Also check tires for roundness and for damage. A fully inflated out-ofround or damaged tire can affect RPK enough to illuminate the low tire light.


Magnetic Speed Variable Assist (MSVA) 5. Selecting and Operating Test Modes

MAGNETIC SPEED VARIABLE ASSIST

(MSVA)

Magna Steer Variable Assist (MSVA) steering is imbedded in the EBCM/EBTCM.

MSVA gives the driver a better steering feel and an improved steering effort. At low speeds the system provides more steering assist so that the driver does not have to work to turn the steering wheel. At higher speeds, MSVA actually puts resistance in the steering system so that is a little more difficult for the driver to turn the steering wheel.

Primarily, MSVA gives extra effort at parking lot speeds and better road feel at highway speeds. The

MSVA circuitry is housed in the EBCM/EBTCM.

The EBTCM controls power steering assist by commanding a current from -1.6 amps to +3 amps to the

MSVA actuator in the steering rack. The MSVA actuator is polarized so that -1.6 amps provides full assist,

0 amps provides some assist, and +3 amps provides steering resistance.


SUBMODE F0: SOLENOID TEST

Solenoid Test - Inlet

The Solenoid Test for Inlet Values activates the selected wheel circuit inlet valve placing it in the pressure hold position. When in the pressure hold position, the valve does not allow master cylinder pressure to be delivered to the hydraulic wheel circuit. This is done under actual operating conditions because the EBTCM has determined that the wheel is moving too slowly, so it holds additional master cylinder pressure from it in an attempt to allow it to rotate at an appropriate speed. The scantool commands the valve to close, which should allow the technician to spin the wheel even though an assistant is applying pressure to the brake pedal.

Solenoid Test - Outlet

The Solenoid Test for Outlet Values activates the selected hydraulic wheel circuit valves, placing them in the pressure release position. When in the pressure release position, the valve allows wheel caliper pressure to be returned to the master cylinder circuit. This is done under actual operating conditions because the

EBTCM has determined that the wheel is moving too slowly, and holding additional master cylinder pressure from it has not allowed it to rotate at an appropriate speed. The scantool commands the valves to these positions which should allow the technician to spin the wheel even through an assistant is applying pressure to the brake pedal.


1. Ignition OFF Position.


3. Turn ignition to the RUN Position.


Mode F4: OBD Controls 5. Selecting and Operating Test Modes




7. Select the Inlet or Outlet command for the wheel position under test. Command the Inlet or Outlet solenoid “ON” by using the “UP” arrow on the scantool.


SELECT TEST

F0: SOLENOID TEST

F1: LAMP TEST

F2: AUTO BLEED

)

PUT VEHICLE

IN PARK

PRESS [ENTER]

TO CONTINUE

e

SOLENOID TEST

F0: LF Inlet

F1: LF Outlet

F2: RF Inlet

F3: RF Outlet

F4: LR Inlet

F5: LR Outlet

F6: RR Inlet

F7: RR Outlet

) x

LF Inlet Sol

DEENERGIZED

LF Outlet Sol

DEENGERGIZED OFF

FIGURE 5-72. F0: Solenoid Test



SUBMODE F2: AUTOMATED BLEED

Perform the Automated ABS Bleed procedure whenever one of the following conditions occur:

• Manual bleeding at the wheel cylinders does not achieve the desired pedal height or feel.

• You replace the Brake Pressure Modulator Valve (BPMV).

• Extreme loss of brake fluid has occurred.

• Air ingestion is suspected.

If none of the above conditions applies, use standard bleed procedures. Refer to “Hydraulic Brake

Procedure” section in the GM repair manual for the vehicle being diagnosed.

This procedure uses the scantool to cycle the system solenoid valves and to run the pump motor in order to purge the air from the secondary circuits. These secondary circuits are normally closed, and are only opened during system initialization at vehicle start-up and during ABS operation. The automated bleed procedure opens these secondary circuits and allows any air trapped inside the BPMV to flow out toward the wheel cylinders or the clippers where the air can be purged out of the system. Refer to the appropriate vehicle service manual for specific bleeding procedures.

To perform DBC 7 Automated Bleed, do the following:

1. Raise the vehicle.

2. Remove all four tire and wheel assemblies.

3. Inspect the brake system for leaks.

4. Inspect the brake system for component damage.

5. Inspect the battery state of charge.

6. Connect the tester to the vehicle DLC.


8. Select the AUTOMATED BLEED procedure.

9. Bleed the base brake system. Refer to the hydraulic brake system bleeding procedure found in the GM service manual for the vehicle you are working on.

10. Follow the tester instructions for each ABS channel to complete the test.

NOTE

If any DTCs are detected, the bleed procedure is aborted.

11. When the Auto Bleed procedure is complete, the brake pedal should be high and firm. If it is not, inspect the brake system for faults. If, after inspection, brake pedal travel is still excessive, repeat the bleed procedure.

12. Disconnect tester from the vehicle DLC.

13. Reinstall all four tire and wheel assemblies.

14. Inspect the brake fluid level.

15. Road test the vehicle.



!

u d e x

1) BLEED BASE

BRAKE SYSTEM

NORMALLY.

2) FOLLOW SERVICE

MANUAL

INSTRUCTIONS.

3) TURN IGNITION ON.

4) TURN THE ENGINE

OFF.

LEFT REAR CIRCUIT

COMPLETE.

PRESS (ENTER)

TO CONTINUE.

E

TEST REPEATS

ABOVE SEQUENCE

FOR RIGHT REAR

CIRCUIT.

RF SECONDARY CIRCUIT

BLEED. OPEN RF BLEED

SCREW. PRESS (ENTER)

TO CONTINUE.

E

* PUMP BRAKES *

PUMP BRAKES

CONTINUOUSLY.

* RELEASE BRAKE *


CLOSE RIGHT FRONT

BLEED SCREW.

PRESS (ENTER) TO

CONTINUE.

E

1) OPEN RF BLEED SCR.

2) CLOSE RF BLEED SCR.


CONTINUE.


EQUIPMENT.

PRESS (ENTER)

TO CONTINUE.

E

* PUMP BRAKES *

CONTINUOUSLY.


CONTINUE.

E

LR SECONDARY

CIRCUIT BLEED.

OPEN LR

BLEED SCREW.



RIGHT FRONT CIRCUIT

COMPLETE.


CONTINUE.

TEST REPEATS

ABOVE SEQUENCE

FOR LEFT FRONT

CIRCUIT.

* PUMP BRAKES *

PUMP BRAKES

CONTINUOUSLY.

AUTOBLEED PROCEDURE

COMPLETE.


CONTINUE.

* STOP PUMPING *

RELEASE BRAKE PEDAL.


CONTINUE.

E



RELEASE THE

PRESSURE FROM THE

EQUIPMENT.

CLOSE LEFT REAR

BLEED SCREW.

PRESS (ENTER)

TO CONTINUE.

* APPLY & HOLD BRAKE

PEDAL *

E

FIGURE 5-73. Automated Bleed

DISCONNECT



CONTINUE.

ACTIVE KEYS

Select AUTOMATED BLEED from the OBD CONTROLS menu.

Scroll up through menu.

Scroll down through menu.

Continue test.



Mode F8: Information 5. Selecting and Operating Test Modes

SUBMODE F3: AUTOMATED TEST

The Automated Test cycles each valve solenoid and pump motor in order to check component operation. If a malfunction is detected, the EBCM sets a DTC(s), which will be displayed upon completion of the test.

SUBMODE F4: RELAY TEST

The ABS Relay Test allows monitoring of the voltage available to the EBCM while turning the Electronic

Brake Relay ON and OFF. When the relay is turned ON, the voltage should be equal to the battery voltage.

When the relay is OFF, the voltage should drop below 5 volts.

NOTE

Relay voltage does not drop to zero when the contacts are open due to capacitors in the EBCM. If the voltage drops below 5 volts, the relay is operating properly.


While performing diagnostic routines on the vehicle under test it may be necessary to be provided with quick access information. Selecting information mode shall display helpful information about the vehicle or system under test. This information may consist of PCM software identification, calibration numbers, part numbers, make date, and/or system identification information.


ABS

DELCO/BOSCH 5.0


ABS

When wheel slip is noted during a brake application, the ABS enters Antilock mode. During Antilock braking, hydraulic pressure in the individual wheel circuits is controlled to prevent any wheel from slipping.

A separate hydraulic line and specific solenoid valves are provided for each wheel. The ABS can decrease, hold, or increase hydraulic pressure to each wheel brake. However, it cannot increase hydraulic pressure above the amount which is transmitted by the master cylinder during braking.

During Antilock braking, a series of rapid pulsations are felt in the brake pedal. These pulsations are caused by the rapid changes in position of the desired wheel speed. This pedal pulsation is present during Antilock braking and stops when normal braking is resumed or when the vehicle comes to a stop. A ticking or popping noise may also be heard as the solenoid valves rapidly cycle. During Antilock braking on dry pavement, the tires may make intermittent chirping noises as they approach slipping. These noises and pedal pulsation’s should be considered normal during Antilock operation.

Vehicles equipped with ABS may be stopped by applying normal force to the brake pedal. Brake pedal operation during normal braking should be no different than previous systems. Maintaining a constant force on the pedal provides the shortest stopping distance while maintaining vehicle stability.

TRACTION CONTROL

Traction control does not have any effect on the operation of the vehicle until the control module detects one or both of the front wheels rotating faster than the rear wheels. At this time, the Electronic Brake and

Traction Control Module (EBTCM) requests the Powertrain Control Module (PCM) to reduce the amount of torque applied to the drive wheels. The PCM does this by retarding timing and selectively turning off fuel injectors (up to a maximum of 5). The EBTCM applies the front brake, thus reducing torque to the front wheels. Once the front wheels begin to rotate at the same speed as the rear wheels, the system returns full control to the driver. During Traction Control mode, if the brake is applied to only one front wheel, most of the torque from the engine is directed to the other front wheel which improves the traction of the vehicle.

The braking is accomplished by closing the TCS Master Cylinder Isolation Valves, this isolates the master cylinder from the rest of the system. The TCS Prime valves open to allow the pump to get brake fluid to build pressure for braking. The drive wheel circuit solenoids are energized as needed to allow for pressure hold, pressure increase, or pressure decrease.

STABILITRAK OPERATION (ICCS2 AND ICCS3)

Stabilitrak includes an additional level of control to the EBTCM. Stabilitrak monitors the wheel speeds, lateral acceleration and steering sensor inputs to calculate a desired yaw rate, and compare it to the actual yaw rate reported by the Yaw Rate Sensor. Steering maneuvers can cause the desired yaw rate to differ from the reported yaw rate by some amount. This difference can result from tire compliance, and wheel slip.

Stabilitrak tries to bring these yaw rates into agreement by selectively applying the front wheel brakes. This is known as Active Brake Control (ABC). If wheel slip rates are excessive, traction control may activate to reduce power.



The following are two types of Stabilitrak: These are ICCS2 and ICCS3.

• The ICCS2 uses normal force information from the CVRSS module to detect rough road conditions to help enhance vehicle braking.

• The ICCS3 does not use normal force information from the CRVSS module to detect rough road conditions to help enhance vehicle braking. ICCS3 is used on vehicles that are not equipped with

CVRSS.



MODE F2: DTCS







SUBMODE F0: SOLENOID TEST

Solenoid Test - Pressure Hold

The Solenoid Pressure Hold Mode activates the selected wheel circuit inlet valve placing it in the pressure hold position. When in the pressure hold position, the valve does not allow master cylinder pressure to be delivered to the hydraulic wheel circuit. This is done under actual operating conditions because the EBTCM has determined that the wheel is moving too slowly, so it holds additional master cylinder pressure from it in an attempt to allow it to rotate at an appropriate speed. The scantool commands the valve to close, which should allow the technician to spin the wheel even though an assistant is applying pressure to the brake pedal.

Solenoid Test - Pressure Release

The Solenoid Pressure Release Mode activates the selected hydraulic wheel circuit valves, placing them in the pressure reduce position. When in the pressure reduce position, the valve allows wheel caliper pressure to be returned to the master cylinder circuit.

This is done under actual operating conditions because the EBTCM has determined that the wheel is moving too slowly, and holding additional master cylinder pressure from it has not allowed it to rotate at an appropriate speed. The scantool commands the valves to these positions which should allow the technician to spin the wheel even through an assistant is applying pressure to the brake pedal.


1. Ignition OFF position.


3. Turn ignition to the RUN position.




7. Select the Hold or Release command for the wheel position under test. Command the hold or release solenoid “ON” by using the “UP” arrow on the scantool.



Mode F4: OBD Controls

SELECT TEST

F0: SOLENOID TEST

F1: LAMP TEST

F2: AUTO BLEED

)

PUT VEHICLE

IN PARK

PRESS [ENTER]

TO CONTINUE

e

SOLENOID TEST

F0: LF Inlet

F1: LF Outlet

F2: RF Inlet

F3: RF Outlet

F4: LR Inlet

F5: LR Outlet

F6: RR Inlet

F7: RR Outlet

) x

LF Inlet Sol

DEENERGIZED

LF Outlet Sol

DEENGERGIZED OFF

FIGURE 5-74. F0: Solenoid Test




SUBMODE: AUTOMATED BLEED

The Auto Bleed procedure is used to provide a complete brake system bleed for the 4-channel Delco/Bosch

ABS system. The Auto Bleed procedure cycles the system valves and runs the ABS/TCS pump to purge air from all secondary circuits that are normally closed off during non-ABS/TCS mode operation and bleeding.

The Auto Bleed test should be used when it is suspected that air has been ingested into the system’s secondary circuits, or when the ABS actuator assembly has been replaced or serviced. Refer to the appropriate vehicle service manual for specific bleeding procedures.


1. Raise the vehicle.

2. Remove all four tire and wheel assemblies.

3. Inspect the brake system for leaks.

4. Inspect the brake system for component damage.

5. Inspect the battery state of charge.



8. Select the AUTOMATED BLEED procedure.

9. Bleed the base brake system. Refer to the hydraulic brake system bleeding procedure found in the GM service manual for the vehicle you are working on.

10. Follow the tester instructions for each ABS channel to complete the test.

11. When the Auto Bleed procedure is complete, the brake pedal should be high and firm. If it is not, inspect the brake system for faults. If, after inspection, brake pedal travel is still excessive, repeat the bleed procedure.

12. Disconnect tester from the vehicle DLC.

13. Reinstall all four tire and wheel assemblies.

14. Inspect the brake fluid level.

15. Road test the vehicle.

NOTE

If any DTCs are detected, the bleed procedure is aborted.

!

u d e x


ACTIVE KEYS

Select AUTOMATED BLEED from the OBD CONTROLS menu.

Scroll up through menu.

Scroll down through menu.

Continue test.


Page 269


1) BLEED BASE

BRAKE SYSTEM

NORMALLY.

2) FOLLOW SERVICE

MANUAL

INSTRUCTIONS.

3) TURN IGNITION ON.

4) TURN THE ENGINE

OFF.

LEFT REAR CIRCUIT

COMPLETE.

PRESS (ENTER)

TO CONTINUE.

E

TEST REPEATS

ABOVE SEQUENCE

FOR RIGHT REAR

CIRCUIT.

RF SECONDARY CIRCUIT

BLEED. OPEN RF BLEED

SCREW. PRESS (ENTER)

TO CONTINUE.

E

* PUMP BRAKES *

PUMP BRAKES

CONTINUOUSLY.



CLOSE RIGHT FRONT

BLEED SCREW.


CONTINUE.

E

1) OPEN RF BLEED SCR.

2) CLOSE RF BLEED SCR.


CONTINUE.


EQUIPMENT.

PRESS (ENTER)

TO CONTINUE.

E

* PUMP BRAKES *

CONTINUOUSLY.


CONTINUE.

E

LR SECONDARY

CIRCUIT BLEED.

OPEN LR

BLEED SCREW.



RIGHT FRONT CIRCUIT

COMPLETE.


CONTINUE.

TEST REPEATS

ABOVE SEQUENCE

FOR LEFT FRONT

CIRCUIT.

* PUMP BRAKES *

PUMP BRAKES

CONTINUOUSLY.

AUTOBLEED PROCEDURE

COMPLETE.


CONTINUE.

* STOP PUMPING *

RELEASE BRAKE PEDAL.


CONTINUE.

E



CLOSE LEFT REAR

BLEED SCREW.

PRESS (ENTER)

TO CONTINUE.

E

* APPLY & HOLD BRAKE

PEDAL *

FIGURE 5-75. Automated Bleed

RELEASE THE

PRESSURE FROM THE

EQUIPMENT.

DISCONNECT



CONTINUE.



SUBMODE F2: AUTOMATED TEST

The Automated Test cycles each valve solenoid and the pump motor (as well as the necessary relays) to check component operation. This test is identical to the ABS initialization sequence test. If a malfunction is detected, the EBTCM sets DTCs which are displayed at the end of the test. The test should be performed as follows.

To perform the Automated Test, do the following:




4. Press @ to select AUTOMATED TEST.

5. Press e to begin the test.



THE AUTOMATED

TEST CYCLES EACH

SOLENOID AND

PUMP MOTOR

TURN IGNITION TO

THE RUN POSITION

MAKE SURE

VEHICLE IS IN

PARK

PRESS (ENTER)

TO START TEST

AUTO TEST

** RUNNING **

@

E

X

NO DTC(S) SET.

TEST PASSED.

AUTOMATED TEST

COMPLETE:

DTC(S) STORED:

XX XX

FIGURE 5-76. Automated Test

ACTIVE KEYS

Select AUTOMATED TEST from the Miscellaneous Test Menu.

Begin Automated Test.




SUBMODE F3: TCS TEST

The Traction Control System (TCS) test runs the pump motor to apply fluid pressure to the front wheel circuits. This test is only active if vehicle is equipped with TCS.


1. Ignition “OFF”.

2. Install the scantool.

3. Turn ignition “ON”.

4. Raise front wheels of vehicle so that wheels are about 6 inches off the floor with the transmission in neutral.

5. Press # to select TCS TEST from the F4: OBD CONTROLS menu.

6. Command the TCS Test ON with the scantool. The pump motor turns ON for approximately 25 seconds.

7. Attempt to move each front wheel by hand, they should not move, due to the pump motor running and applying pressure to the front wheels.

SELECT DATA LIST

F3: TCS TEST

#

THIS TEST RUNS

THE PUMP MOTOR &

APPLIES PRESSURE

TO THE

D

FRONT WHEEL

CIRCUIT. IF THE

SYSTEM IS WORKING

PROPERLY

D

THE FRONT WHEELS

SHOULD BE LOCKED

DURING THE TEST

D

RAISE FRONT

WHEELS OFF GROUND

D

TURN IGNITION TO

THE RUN POSITION

D

AUTOMATED TEST


& PUMP MOTOR


E

TEST IN PROCESS

00/25 SECONDS

PRESS [EXIT] TO

TERMINATE TEST

TEST COMPLETE

PRESS [EXIT] TO

RETURN TO MENU

X

FIGURE 5-77. TCS Test

DTC (S) STORED

XX

[ENTER] TO CONT.



SUBMODE: LAMP TEST

The Lamp test allows you to manually control up to five ABS Lamps for diagnostic purposes. Different vehicles allow control of different Lamps. The tester displays the list of Lamps for the vehicle you are testing.



2. Select the LAMP Test.

3. The tester display confirms that you are in the ABS Lamp Test. The display automatically scrolls after four seconds, or when you press the u

key.

4. A Select Lamp menu is displayed. Press the key (), !, @,

#

, $)that corresponds to the Lamp you want to test. Use the u and d keys to turn the Lamp ON and OFF (or flash). The commanded state of the Lamp is displayed on line.

5. Press X to return to the SELECT LAMP menu, or press X twice to return to the SELECT TEST menu.

SELECT TEST

F3: TCS TEST

F4: LAMP TEST

F5: MAGNASTEER TEST

$

SELECT LAMP

F0: ABS LAMP

F1: TCS LAMP

F2: TRACTION

4 Seconds or

u

SELECT LAMP

F3: SERVICE STBLT

F4: STABILITY

!

ABS LAMP

COMMAND: ON

= ON = OFF

d u

ABS LAMP

COMMAND: OFF

= ON = OFF


ACTIVE KEYS

Select the Lamp you want to test from the Select Lamp menu

) , !

, @ ,

# , $ u d x

Turn the selected Lamp ON.

Turn the selected Lamp OFF.

Return to the SELECT LAMP menu. Press X twice to return to the SELECT TEST menu.



SUBMODE F6: MAGNA STEER TEST

The Electronic Brake/Traction Control Module (EBTCM) controls a bi-directional magnetic rotary solenoid. The solenoid, which is located in the steering gear, adjusts the amount of power steering assist to achieve a given level of driver effort to turn the vehicle. The EBTCM varies the steering assist by adjusting the current flow through the solenoid. The amount of steering assist adjusted for steering is dependent upon vehicle speed. As the vehicle speed increases, steering assist decreases (driver effort increases) and as speed decreases, steering assist increases (driver effort decreases).

The Electronic Brake/Traction Control Module (EBTCM) is the same controller the ABS, TCS, and Magna

Steer systems communicate with. Magna Steer Diagnostic Trouble Codes (DTCs) can be retrieved by selecting F2: DTC Info from the SELECT MODE menu.

If an open or short is present CKT 345 (WHT) or CKT 1787 (GRY) the EBTCM sets DTC C1241 Magna

Steer circuit malfunction.

The Magna Steer test controls the steering effort from “Full Firm” to “Less Firm” as the technician turns the steering wheel from left to right. The test lasts for approximately 12 seconds. The reading on the tester toggles between “Full Firm” and “Less Firm” every 4 seconds. The software displays any DTCs found while running the Magna Steer test.

MAGNASTEER TEST

START ENGINE

U

MAGNA STEER TEST

STEERING EFFORT

COMMANDS WILL BE

CONTROLLED -

U

STEERING EFFORT

SHOULD BE LESS

FIRM THEN CHANGE

TO MORE FIRM

U

STEERING EFFORT

SHOULD RETURN

TO NORMAL AFTER

APPROX 6 SEC

U

MAGNA STEER TEST

TURN STEERING

WHEEL. PRESS


E

FULL FIRM MSVA

CONTROL

3 SECONDS

LESS FIRM MSVA

CONTROL

3 SECONDS

TEST COMPLETE

FIGURE 5-79. F6: Magna Steer Test


Kelsey-Hayes 4WAL 4 Sensor (Hydraulic Antilock Brake System) 5. Selecting and Operating Test Modes

GM MEDIUM DUTY 4WAL ABS

KELSEY-HAYES 4WAL 4 SENSOR

(HYDRAULIC ANTILOCK BRAKE SYSTEM)

SELF TESTS

The ABS performs the following two system self-tests:

• The first self-test is performed when the ignition is turned to RUN. Both the ABS indicator lamp and the

“BRAKE” warning lamp turn on for three seconds, then they turn off. This test confirms correct operation for the EBCM and the lamps. If one of the lamps remain on, either the ABS or the base brake system requires service.

• The second self-test is performed when the vehicle reaches a speed of greater than 3 mph. At this time, the internal EBCM relay, six solenoid coils and BPMV pump motor are cycled and checked for short/ opens. The BPMV pump makes a slight sound when this function occurs.


Submode F0: Function Test

The Function Test cycles each valve solenoid and the pump motor (as well as the necessary relays) to check component operation. If a malfunction is detected, the EBCM sets DTC(s), which are displayed upon completion of the test.

To perform the Function test, do the following:

1. Ignition OFF.


3. Turn ignition to RUN.

4. Select OBD CONTROLS from the scantool.

5. Press and hold brake pedal to run the Function Test.

6. Note any DTCs set.

Submode F1: History Data

History Data displays ABS Stop count and Ignition counts in History Block format with a total of 9 History

Blocks. Each time the user clears DTCs using the scantool, it increments the current History Block erasing the oldest Block. Each History Block stores the DTC(s) related to each.


Kelsey-Hayes 4WAL 4 Sensor (Hydraulic Antilock Brake System) 5. Selecting and Operating Test Modes

Submode F2: DTC History

DTC History displays DTC information in History Block format with a total of 9 History Blocks. Each time the user clears DTCs using the scantool, it increments the current History Block erasing the oldest Block.

Each History block stores the DTC(s) information as well as ABS Stop count and Ignition counts related to

it (See

Submode F1: History Data

for this information). The controller can store up to 48 DTCs in each

DTC History Block.

NOTE

Block 0 always references the current DTC Block.

Submode F3: Tire Size Calibration

Whenever the EBCM is replaced and/or the tire size is changed, it is necessary to reset the tire size calibration in the EBCM using the scantool. For the ABS to work properly, the EBCM must be calibrated to recognize the tire and wheel size. All vehicles are programmed at the factory with these calibrations and remain programmed even if the battery is disconnected or the EBCM is removed from the vehicle.

Submode F4: Trim Calibration

The trim level calibration corresponds to the different wheelbase and brake types available on each vehicle.

Whenever the EBCM is replaced and/or the wheelbase is altered, the EBCM must be programmed with the new trim level calibration using the scantool. It is necessary to determine the wheel base and type of brakes through the RPO codes to select the correct rim level on the scantool. For the ABS to work properly, the

EBCM must be calibrated to recognize the wheelbase and brake type of the various possible vehicle configurations. All vehicles are programmed at the factory with these calibrations and remains programmed even if the battery is disconnected or the EBCM is removed from the vehicle.


Kelsey-Hayes 4WAL 4 Sensor (Electric/Hydraulic Parking Brake) 5. Selecting and Operating Test Modes

KELSEY-HAYES 4WAL 4 SENSOR

(ELECTRIC/HYDRAULIC PARKING BRAKE)

The PBCM Performs self-diagnostics and can detect and isolate some system faults. When a fault is detected, the PBCM sets a diagnostic trouble code and turns on the SERVICE PARK BRAKE indicator.

The EHPB (Electronic/Hydraulic Parking Brake) functions are also disabled. Some errors also cause the

PBCM to store system pressure and/or voltages along with the trouble code to aid in diagnostics.

Before beginning testing of the Parking Brake system, several checks should be made to eliminate the common problems.

• Make sure the batteries are fully charged. If the vehicle is equipped with a diesel engine. Disconnect the intake air heater, The intake air heater may cause low voltage reading if it is left.


Submode F0: PROM ID

The PROM ID refers to the 4WAL Version ID Number.

Example: GMC1147P


Kelsey-Hayes RWAL - All Versions 5. Selecting and Operating Test Modes

KELSEY-HAYES ABS SYSTEMS

KELSEY-HAYES RWAL - ALL VERSIONS

All 1992-94 “C” and “K” 3500 Heavy Duty (HD) vehicles are equipped with a Zero pressure Rear Wheel

Antilock (ZP RWAL) system. All other vehicles are equipped with Rear Wheel Antilock (RWAL) systems.

Both systems operate the same; however, parts are not interchangeable. Rear Wheel lock-up is prevented by regulating fluid pressure to rear wheel cylinders. Pressure regulating is adjusted by a control valve located under the master cylinder. Control valve is regulated by an RWAL Electronic Control Unit (ECU), also known as an Electric Brake Control Module (EBCM), located next to master cylinder.

On 1993 “S” and “T” Series pickup trucks equipped with 4.3L engine and a manual transmission, RWAL system is controlled by the Vehicle Control Module (VCM). VCM is located behind glove box. Power for

ABS portion of VCM is provided by brake enable relay located behind instrument panel.

NOTE

For identification purposes, RWAL system has a Black connector top on the controller and ZP RWAL has a Gray connector top on the controller.

ZP RWAL

Grey Colored

Connector Top

RWAL

Black Colored

Connector Top

FIGURE 5-80. RWAL Connectors

The ECU or EBCM receives signals from the stoplight switch and a speed sensor, located in the transmission on 2WD vehicles or in transfer case and front axle switch on 4WD vehicles. The VCM used on

1993 “S” and “T” Series pickup equipped with 4.3L and manual transmission receives input signals from pressure differential switch located on combination valve, and reset switch which is part of antilock pressure valve. On all vehicles, speed sensor signal is sent through a Vehicle Speed Sensor (VSS) buffer located behind glove box. On most vehicles, VSS buffer is actually a part of the Digital Ratio Adapter Controller

(DRAC) although the 2 terms may be used interchangeably. If axle ratio or tire size is changed, VSS buffer must be reprogrammed to match axle ratio or tire size as necessary. The RWAL brake system is disabled when vehicle is in 4WD, if equipped.



The RWAL system is connected to the existing brake warning light on the instrument panel. When ignition is turned on, warning light should come on for approximately 2 seconds as a bulb test.

NOTE

Data List is not available for some Kelsey-Hayes RWAL systems.

SELECT SYSTEM

F0: RWAL

F1: 4WAL

)

INSTALL ADAPTERS

1: GM 12/14 PIN

2: RWAL/4WAL

[ENTER]

)

RWAL SELECT

F0: VCM RWAL

F1: ZP RWAL

F2: ALL OTHERS

!

or @

SELECT MODE

F0: DATA LIST

F1: FUNCTION TEST

F2: DTC

D

SELECT MODE

F3: SNAPSHOT

F4: MISC TEST

SELECT MODE


F2: DTC

F3: MISC TEST

D

SELECT MODE

F4: VSS MONITOR

FIGURE 5-81. Selecting RWAL



KELSEY-HAYES VOLTAGE CHECK

When a vehicle equipped with an RWAL or ZP RWAL system is selected the tester automatically performs a voltage check. When a VCM RWAL system is selected, a communication check, Ignition 3 circuit and

Engine Codes check are automatically performed. If the vehicle passes the tests, the Select Mode menu is displayed and you do not see the tester displays shown below in the test descriptions. If a problem is detected during the tests, the tester indicates what you should do to correct the problem.

KELSEY-HAYES RWAL, ZP RWAL VOLTAGE CHECK

After selection of an RWAL system the tester automatically performs a voltage check on pin “H” of the

DLC connector. If system voltage is normal (8-15 volts), the tester advances to the SELECT MODE menu.

Examples of tester screens that might appear if an incorrect voltage is detected are shown in

Figure 5-82

.

CHECK FOR

OPEN/SHORT IN

VSS CIRCUIT

OR BLOWN FUSE

CHECK BATTERY

CHECK CONNECTION

BETWEEN

DRAC & RWAL ECU

CHECK

ALTERNATOR FOR

OVER CHARGING

AND BATTERY

< 1.5 VOLTS 1.5 - 8 VOLTS > 15 VOLTS

FIGURE 5-82. Incorrect Voltage Detected Messages

If the system voltage is greater or less than the 8 to 15 volt specification, the tester does not permit you to continue until the fault is corrected and voltage is within the normal range.

KELSEY-HAYES VCM RWAL VOLTAGE CHECK

Engine Codes Present

If engine codes 51, 53 or 55 have been set, the tester instructs you to clear the codes before testing. Press

E

to continue.

ENGINE CODES

51, 53, 55

ARE PRESENT

5 Seconds CODES ARE SET

CLEAR CODES

BEFORE TESTING

PRESS ENTER

Ignition 3 Circuit Check

If Ignition 3 circuit voltage is not detected, you are asked to check for an open or short condition in circuit

#340 and for a blown brake fuse. Press X to continue.

CHECK FOR

OPEN/SHORT IN

CIRCUIT #340

5 Seconds CHECK FOR BLOWN

BRAKE FUSE



MODE F1: FUNCTION TEST

RWAL and ZP RWAL

The purpose of the FUNCTION TEST is to cycle the RWAL system. The tester guides you step by step through the FUNCTION TEST process.

The tester simulates an acceleration and deceleration signal which causes the RWAL ECU to cycle the

REAR WHEEL ANTILOCK system (RWAL). If the system stores a trouble code during the test, the tester displays the code on completion of the test. If a trouble code is set before you begin the test the tester displays the code and you are not permitted to continue until the code is cleared.

Run the function test under the following conditions:

• After Bleeding the brake system, use the scantool to run the Function Test four times while applying the brake pedal firmly.

• If any component is replaced which may have caused air to enter the BPMV, use the scantool to run the

Function Test four times while applying the brake pedal firmly.

NOTE

If either of the above conditions has occurred, always re-bleed all four wheels to remove the remaining air from the brake system.

To select Function Test, do the following:

1. Press ! to select the FUNCTION TEST mode from the SELECT MODE menu.

2. Complete the FUNCTION TEST by following the directions on each screen.

The brake must be continuously applied to conduct the 4WAL function test. If the system does not cycle, check the brake lamp switch circuit.


Kelsey-Hayes RWAL - All Versions

SELECT SYSTEM

F0: DATA LIST



!

FUNCTION TEST

CK FLUID LEVEL

CK/SET PRK BRAKE

PRESS ENTER

APPLY AND

HOLD BRAKE TO

ACTUATE TEST

D

TEST IS BEING

CONDUCTED


ADVANCE

HOLD

D

CODE XX

DESCRIPTION

NO CODES

TEST COMPLETE

FIGURE 5-83. Example of RWAL Mode F1: Function Test e x

ACTIVE KEYS

Cause the next screen of instruction to be displayed.





To check Trouble Codes, do the following:

1. Turn ignition ON, wait 5 seconds, and observe the “BRAKE” warning light. If the “BRAKE” warning light is ON, go to next step. If “BRAKE” warning light is OFF, use the scantool to retrieve trouble codes.

2. Turn ignition OFF. Connect the scantool to DLC. Access RWAL brake trouble codes by selecting @ from the Select Mode menu. The scantool only displays the last recognized soft (History) codes. Repair trouble codes in order they appear. When one trouble code is diagnosed and repaired, it is necessary to access RWAL brake trouble codes again to check for more stored trouble codes.

Hard Codes and Soft Codes

Hard (Current) codes indicate an existing problem in the RWAL brake system. Soft (History) codes indicate a problem that occurred in the past.

Hard (Current) Codes

When a hard code is set:

• ABS is disabled

• Diagnostic trouble code (DTC) is stored in memory

• RBWL remains lit until vehicle is serviced

• Rear brake warning light (RBWL)

Soft (History) Codes

There are two types of soft codes, ignition-latched and condition-latched. When and ignition-latched code is set:

• ABS is disabled

• DTC is stored in memory

• Rear brake warning light (RBWL) remains “ON” for current ignition period

At successive ignition periods, ABS is enabled and RBWL remains “OFF” unless fault persists.

When a condition-latched code is set:

• ABS is disabled

• DTC is stored in memory

• Rear brake warning light (RBWL) remains “ON” as long as fault persists

NOTE

Once a code is stored in memory it remains in memory until cleared by the scantool.



CODE

7

8

5

6

3

4

1, 11, 12

2

9

10

13, 14, 15

17

(VCM/RWAL applications only)

TYPE a

IS*

IS*

IS*

IS*

IS**

IS**

IS**

H

CS*

H

DESCRIPTION

None

Open isolation valve solenoid circuit or malfunctioning EBCM/VCM

Open dump valve solenoid circuit or malfunctioning EBCM/VCM

Grounded valve reset switch circuit

Excessive actuations of dump valve during antilock braking

Erratic speed signal

Shorted isolation valve circuit or faulty EBCM/VCM

Shorted dump valve circuit or faulty EBCM/VCM

Open or grounded circuit to vehicle speed sensor

Brake switch circuit

EBCM malfunction

Brake enable relay circuit

TABLE 5-1. RWAL ABS DTCs a. H = Hard Code

IS = Ignition-latched soft code

CS = Condition-latched soft code

* Before 1991 model year

** Before 1993 model year


RWAL ABS Systems (Except ZP RWAL and VCM RWAL) 5. Selecting and Operating Test Modes

RWAL ABS SYSTEMS (EXCEPT ZP RWAL

AND VCM RWAL)


Clearing Trouble Codes

NOTES

On vehicles built after August 6, 1990, certain detected faults no longer result in the EBCM “latching” the red “BRAKE” warning Lamp circuit.

The lamp lights only while the fault exists, and continue being lit for the rest of the ignition cycle for codes 6 and 9. Code 10 turns “OFF” when 12volt signal is received from the brake switch.

After February 1993, only codes 5, 13, 14 and 15 latches a hard code. Use scantool to read soft codes. Grounding DLC terminal A to H results in a false code 9 and erase the true code.

To clear Trouble Codes, do the following:

1. Turn the ignition switch “OFF”.

2. Remove the fuse that powers the memory.

• C and K series HD remove the STOP HAZARD fuse.

• 1993 S and T series pickup equipped with the 4.3L and manual transmission from the ECM “B” or

VCM “B” fuse.

CAUTION!

CAUTION

Failure to turn the ignition key OFF before removing the fuse can permanently damage the EBCM.

3. Wait at least 20 seconds.

4. Reinstall the fuse that powers the memory.

5. Test drive the vehicle to make sure the problem has been repaired.


RWAL ABS Systems (Except ZP RWAL and VCM RWAL) 5. Selecting and Operating Test Modes

CODE 2

DETECTED

Approximately

5 seconds

)

5 seconds

OPEN WINDING

ISOLN VLV SOLNOD

OR POSSIBLE ECU

MALFUNCTION

U

5 seconds

CHECK VALVE

CONNECTIONS &

RESISTANCE

4 OHMS

U

Return to

Menu

FIGURE 5-84. RWAL ABS Systems y , n u d x

ACTIVE KEYS

Used to determine what DTCs to clear.

Display the next DTC.

Freeze the display of the latest DTC.

Terminate DTC display.


VCM RWAL ABS Systems 5. Selecting and Operating Test Modes

VCM RWAL ABS SYSTEMS



NOTES

On vehicles built after August 6, 1990, certain detected faults no longer result in the EBCM “Latching” the red “BRAKE” warning lamp circuit.

The lamp lights only while the fault exists, and continues being lit for the rest of the ignition cycle for codes 6 and 9. Code 10 turns “OFF” when 12volt signal is received from the brake switch.

After February 1993, only codes 5, 13, 14 and 15 latch a hard code. Use scantool to read soft codes. Grounding DLC terminal A to H results in a false code 9 and erases the true code.

DTCs must be cleared from memory using the scantool. Removing power from the EBCM does not clear codes, as on other systems.

CODE 2

DETECTED

CLEAR CODES?

YES/NO

Approximately

5 seconds

)

OPEN WINDING


y

CLEARING CODES

UNABLE TO

CLEAR CODES

U

5 seconds

5 seconds

CHECK VALVE

CONNECTIONS &

RESISTANCE

3 TO 6 OHMS

U

CHECK CIRCUIT

#901/#450

FOR OPENS

U

CODES CLEARED

FIGURE 5-85. VCM/RWAL ABS Systems

Return to

Menu

y , n u d x

ACTIVE KEYS

Determine what DTCs to clear.





ZP RWAL ABS Systems 5. Selecting and Operating Test Modes

ZP RWAL ABS SYSTEMS



NOTES

On vehicles built after August 6, 1990, certain detected faults no longer result in the EBCM “Latching” the red “BRAKE” warning lamp circuit.

The lamp lights only while the fault exists, and continues being lit for the rest of the ignition cycle for codes 6 and 9. Code 10 turns “OFF” when 12volt signal is received from the brake switch.

After February 1993, only codes 5, 13, 14 and 15 latch a hard code. Use scantool to read soft codes. Grounding DLC terminal A to H results in a false code 9 and erases the true code.

The EBCM installed in ZP RWAL applications does not have a volatile memory. Simply removing EBCM memory power does not clear diagnostic trouble codes.

To clear Trouble Codes, do the following:

1. Turn the ignition switch “OFF”.

2. Remove the fuse that powers the memory.

• C and K series HD remove the STOP HAZARD fuse.

• 1993 S and T series pickup equipped with the 4.3L and manual transmission from the ECM “B” or

VCM “B” fuse.

CAUTION!

CAUTION

Failure to turn the ignition key OFF before removing the fuse can permanently damage the EBCM.

3. Turn ignition key ON.

4. Follow the clear code instructions from the F2 DTC selection on the scantool.

NOTE

The brake lamp should turn “OFF”.

5. Turn ignition key OFF.

6. Replace the fuse that powers the memory.

CAUTION!

CAUTION

Turn the ignition key OFF before replacing the Stop/hazard fuse to prevent damage to the EBFCM.



7. Test-drive the vehicle to make sure the malfunction has been repaired and no codes reset.

CODE 2

DETECTED

Approximately

5 seconds

)

5 seconds

OPEN WINDING


OR POSSIBLE ECU

MALFUNCTION

U

5 seconds

CHECK VALVE

CONNECTIONS &

RESISTANCE

4 OHMS

U

CLEAR CODES ?

FUSE MUST BE

REMOVED TO

CLEAR CODES

PRESS

U

CLEARING CODES

CODES CLEARED

Y

FIGURE 5-86. ZPRWAL ABS Systems

UNABLE TO

CLEAR CODES

Return to

Menu y , n u d x

ACTIVE KEYS

Determine what DTCs to clear.







Submode F0: DRA Check

NOTES

• DRA Check does not function on 6.2L diesel, or 1991 trucks over 8600

GVW with power train control module (PCM) and 4L80E electronic transmission.

• The DRA CHECK function is not available for 1992 to present vehicles.

The Digital Ratio Adapter (DRA) Check allows you to compare the ECM, the RWAL ECU, the speedometer, and a calculated speed to help you determine if a faulty speed signal is causing a malfunction.

The calculated speed is accomplished by first measuring the circumference of the vehicle tire and obtaining the axle ratio. With the tire size and the axle ratio entered in the appropriate screens, the tester performs the calculation. The ECM, RWAL, and CALCULATED speeds are displayed while driving at a constant 50 mph calculated speed.

To check DRA, do the following:

1. Select the OBD CONTROLS mode by pressing # during the Select Mode phase of operation.

2. Select the DRA CHECK by pressing ).

F0: 2.5 L VIN = 5

F1: ALL OTHERS

3. Select the engine type by pressing the appropriate function key.

The tester directs you to measure the tire circumference.

4. Mark the tire at the floor and draw a line on the floor adjacent to the mark on the tire. Move the vehicle one revolution of the tire so the mark on the tire contacts the floor at the same position as previously. At the point the mark on the tire contacts the floor, draw another line. Finally, measure between the two lines. This is the tire circumference.

Next the tester prompts you to obtain the axle ratio.

5. Find the axle ratio code stamped on the axle housing or on the SERVICE PARTS IDENTIFICATION sticker in the glove box.

6. After entering the tire circumference and axle ratio, drive the vehicle 50 mph using the calculated speed on the tester screen.

NOTE

Vehicles with manual transmissions should be driven in 4th gear, automatic transmissions should be driven in 3rd gear.

7. The tester calculates the speed using engine rpm and the entered axle ratio and tire circumference. The screen displays ECM, RWAL, and CALCULATED mph. The axle ratio and tire size is displayed at the bottom of the screen as a reminder.



)

!

0

-

9 e x

ACTIVE KEYS

Select 2.5L engine VIN code E.

Select all others.

All number keys.


Return to Select OBD Controls Mode.

Submode F1: Brake Switch Test

The purpose of the Brake Switch Test is to determine if there is a malfunction in the brake switch circuit.

While in the Brake Switch Test mode, if the vehicle has 4WD, the tester also checks the front axle and transfer case switched circuits.

To test the Brake Switch, do the following:

1. Select the OBD CONTROLS mode by pressing # during the Select Mode phase of operation.

2. Select Brake Switch Test by pressing !.

3. Complete the Brake Switch Test by following the directions on each screen.

)

!

e x

ACTIVE KEYS

Select 2 Wheel Drive.

Select 4 Wheel Drive.


Return to Select OBD Controls mode.


VCM RWAL 5. Selecting and Operating Test Modes

VCM RWAL

The VCM RWAL system only applies to 1993 model year vehicles.


Submode F0: Brake Lamp Test

Submode F1: Brake Relay Test

These tests allow you to check the VCM RWAL ABS Brake Telltale Lamp and Brake Enable Relay by commanding them on and off while monitoring the feedback state reported by the VCM RWAL ECU. The states are commanded on by pressing the u key and off by pressing the key. If the lamp and relay are operating properly, the commanded state and the feedback state are the same.

To check Brake Lamp/Relay, do the following:

1. From the SELECT OBD CONTROLS menu select the Brake Lamp Test by pressing ) or the BRAKE

RELAY Test by pressing !.

2. You are prompted to press u to command the lamp or relay on, or press d to turn the lamp or relay off. The tester displays the commanded state and the feedback state for the lamp or relay.

If vehicle speed greater than 3 MPH is detected, the tester informs you and the test is prevented.

3. Press X to return to the SELECT OBD CONTROLS menu or press X twice to return to the

SELECT MODE menu.

RWAL SELECT

F0: VCM RWAL

F1: ZP RWAL

F2: ALL OTHERS

)

SELECT MODE

F0: DATA LIST



F3: SNAPSHOT

F4: MISC. TESTS

$

SELECT MISC TEST

F0: BRK LAMP TEST

F1: BRK RELY TEST

F2: VSS TEST

) !

ABS TELLTALE

= ON = OFF

COMMAND: OFF

FEEDBACK: OFF

BRK ENABLE RELAY

= ON =OFF

COMMAND: OFF

FEEDBACK: OFF

FIGURE 5-87. F0: Brake Lamp Test and F1: Brake Relay Test


VCM RWAL

)

!

U

D

X

ACTIVE KEYS

Select BRAKE LAMP Test.

Select BRAKE RELAY Test.

Command lamp or relay on.

Command lamp or relay off.

Return to the OBD CONTROLS menu.



VCM RWAL 5. Selecting and Operating Test Modes

Submode F2: VSS Test

The following test is available for 1993 VCM RWAL systems only.

The VSS test allows you to monitor the Vehicle Speed Signal (VSS) as it is detected by the VCM RWAL controller.

To test VSS, do the following:

1. Select VSS Test from the SELECT OBD CONTROLS menu by pressing @.

2. The tester displays the vehicle speed in miles per hour and in kilometers per hour.

3. Press X to return to the SELECT OBD CONTROLS menu or press X twice to return to the

SELECT MODE menu.

RWAL SELECT

F0: VCM RWAL

F1: ZP RWAL

F2: ALL OTHERS

)

SELECT MODE

F0: DATA LIST



F3: SNAPSHOT

F4: MISC. TESTS

$

SELECT MISC TEST

F0: BRK LAMP TEST

F1: BRK RELY TEST

F2: VSS TEST

@

VSS MONITOR

MPH xxx KPH xxx

FIGURE 5-88. F2: VSS Test

@ x

VSS MONITOR ACTIVE KEYS

Select VSS Test from the SELECT OBD CONTROLS menu.

Return to the SELECT OBD CONTROLS menu.


RWAL and ZP RWAL 5. Selecting and Operating Test Modes

RWAL AND ZP RWAL

MODE F4: VSS MONITOR

The purpose of the VSS Monitor Mode is to monitor the Vehicle Speed Signal (VSS) as it is detected by the

RWAL ECU. This test is not available for 4WAL, ZP RWAL or VCM RWAL Systems.

To monitor VSS, do the following:

1. Select the VSS MONITOR mode from the Select Mode menu by pressing $.

2. The tester shows the vehicle speed in miles per hour and in kilometers per hour.


SELECT MODE

F0: DATA LIST



x

SELECT MODE

F4: MISC TESTS

F5: VSS MONITOR

%

VSS MONITOR

MPH KPH

0 0

FIGURE 5-89. VSS Monitor

ACTIVE KEY



Kelsey-Hayes 4WAL ABS 5. Selecting and Operating Test Modes

KELSEY-HAYES 4WAL ABS

1990-92 LIGHT TRUCKS EXCEPT FWD VANS

The Kelsey-Hayes 4 Wheel Antilock (4WAL) brake system is used to prevent wheel lock-up during heavy braking. This allows driver to maintain steering control while stopping vehicle in shortest distance possible.

The system consists of Electro-Hydraulic Control Unit (EHCU), 4 wheel sensors, warning lights, electrical wiring, and hydraulic lines.

The EHCU consists of an Electronic Control Unit (ECU), hydraulic control unit, 2 accumulators, pump motor and a relay. The hydraulic control unit consists of an Isolation Solenoid Valve (ISO), Pulse-Width

Modulated (PWM) valve, a High Pressure Accumulator (HPA), Low Pressure Accumulator (LPA) and a reset switch on each channel. If overhaul or repair to any component on the EHCU is necessary, complete assembly must be replaced.

1993-95 ASTRO, “C” AND “K” SERIES, “G” SERIES, SAFARI, “S”

AND “T” SERIES

The Kelsey-Hayes 4 Wheel Antilock (4WAL) brake system is used to prevent wheel lock-up during heavy braking. This allows driver to maintain steering control while stopping vehicle in shortest distance possible.

The system consists of Brake Pressure Modulator Valve (BPMV) or Electro-Hydraulic control Unit

(EHCU), Vehicle Speed Sensor (VSS) buffer, warning lights, electrical wiring and hydraulic lines.

On all except 1995 “C” and “K” series, the BPMV consists of an Electronic Control Unit (ECU), hydraulic control unit, 2 accumulators, pump motor and a relay. The hydraulic unit consists of an isolation solenoid valve, Pulse-Width Modulated (PWM) valve, a High Pressure Accumulator (HPA), Low Pressure

Accumulator (LPA) and a reset switch on each channel. If overhaul or repair to any component on the

BPMV is necessary, replace complete assembly.

On 1995 “C” and “K” series, the EHCU consists of the BPMV, Electronic Brake Control Module (EBCM), and combination valve. The BPMV consists of internal control cartridges, electric motor and pumps.

Components of the EHCU are individually replaceable.

1994-95 “S” AND “T” SERIES PICK-UP AND SONOMA; 1995

BLAZER AND JIMMY

The Kelsey-Hayes 4 wheel Antilock (4WAL) brake system is used to prevent wheel lock-up during heavy braking. This allows driver to maintain steering control while stopping vehicle in shortest distance possible.

The system consists of Brake Pressure modulator valve (BPMV), Vehicle Speed Sensor (VSS), Vehicle

Control Module (VCM), Wheel Speed Sensors (WSS), warning lights, electrical wiring and hydraulic lines.

The BPMV consists of a hydraulic control unit, 2 accumulators, pump motor and a relay. The hydraulic control unit consists of an isolation solenoid valve, Pulse Width Modulated (PWM) valve, a High Pressure

Accumulator (HPA), Low Pressure Accumulator (LPA) and a reset switch on each channel. If overhaul or repair to any components on the BPMV is necessary, replace complete assembly.



KELSEY-HAYES RWAL VOLTAGE CHECK

There are several styles of 4WAL systems. Depending on the model year selected, the displayed menu items may read: 4WAL 3-Sensor, 4WAL 4-Sensor, VCM 4WAL, and VCM 4WAL OBD II. The tester also performs a voltage check when 4WAL is selected from the 1990-95 system select menu (1996 to present) automatically select 4WAL). The 4WAL system voltage normally switches from 0 to 5 volts. If the system voltage is normal, the select mode menu is automatically displayed. If the voltage is not within the normal range, one of the following messages is displayed. These conditions must be corrected before the tester continues.


4WAL TO ALDL

SHORT ALDL WIRING

OPEN IGN FEED

0 VOLTS

SYSTEM NOT

TRANSMITTING

CHECK GROUND AND

ECU

1 - 5 VOLTS



MODE F2: DTC(S)

The EBCM generates DTCs when it detects a failure in the EBCM system input or output circuits. Each code refers to a trouble tree in the service manual. Codes indicate a problem with a circuit, not just a component, and the type of failure. Do not replace components based only on DTCs without following the appropriate trouble tree found in the vehicle repair manual. The EBCM sets and stores a DTC if it detects a malfunction in the 4WAL brake system. Selecting the DTC test checks the EBCM for a stored code. If a code is present, it is displayed on the scantool.

NOTES

• DTCs cannot be cleared until the fault is repaired and the ignition cycled.

• A DTC that is set in a current ignition cycle does not clear during that same ignition cycle. The ignition switch must be cycled to the “OFF” position for 10 seconds and back “ON” to clear a DTC in a current ignition cycle.

To clear DTCs, do the following:


2. Connect scantool to DLC Connector.

3. Select DTCs from the SELECT MODE menu by pressing @.

4. Repair Trouble Codes in the order they appear.

Use the scantool to retrieve DTCs by selecting @ DTCs from the SELECT MODE menu.




DTC(S)

ABS CODE A007

REAR RELAY CNT CS

OPEN, FUSE OPEN

Approximately

2 seconds

3 Seconds or u

DTC(S)

ABS CODE A048

RF WHEEL SPEED

3 seconds or u

DTC(S)


Y

DTC(S)

CODES CLEARED

EXIT

FIGURE 5-90. F2: DTCs y , n u d x

VSS MONITOR ACTIVE KEYS

Clear codes.



Return to the SELECT OBD CONTROLS menu.






Submode: Solenoid Tests (Isolation Valves)

The Solenoid Test valves activates the selected wheel circuit isolation valve, placing it in the pressure hold position. When in the pressure hold position, the valve does not allow master cylinder pressure to be delivered to the hydraulic wheel circuit. This is done under ABS operating conditions because the EBCM has determined that the wheel is moving too slowly, so it holds additional master cylinder pressure from it in an attempt to allow it to rotate at an appropriate speed. The scantool commands the valve to close, which should allow the technician to spin the wheel even though an assistant is applying pressure to the brake pedal. Perform the test as follows:

1. Ignition OFF.




5. Select Solenoid Test from the OBD CONTROLS menu.

6. Select the desired Isolation Solenoid test. Have an assistant command the Isolation valve ON with the scantool.

7. Have the assistant press and hold the brake pedal.

8. Attempt to move the wheel being tested by hand; it should move even though the assistant is applying pressure to the brake pedal. The wheels may be difficult to turn by hand, but can be moved if the system is working properly.

Solenoid Tests (Dump Valves)

The solenoid test for Dump valves activates the selected hydraulic wheel circuit Dump valve, placing it in the pressure release position. When in the pressure release position, the valve allows wheel caliper pressure to be returned to the master cylinder circuit. This is done under ABS operation conditions because the

EBCM has determined that the wheel is moving too slowly, and holding additional master cylinder pressure from it has not allowed it to rotate at an appropriate speed. The scantool commands the valve to release hydraulic pressure to the affected brake caliper, which should allow the technician to spin the wheel even through an assistant is applying pressure to the brake pedal. Perform the test as follows:

1. Ignition OFF.





6. Select Solenoid Test from the OBD CONTROLS menu.

7. Select the desired Dump Solenoid Test. Have the assistant command the Dump valve ON with the scantool.

8. Attempt to move the wheel being tested by hand; it should move even though the assistant is applying pressure to the brake pedal. The wheels may be difficult to turn by hand, but can be moved if the system is working properly.



Submode F1: History Data

The History Data function identifies drive cycle (ignition counts) and ABS Activation counts relative to when codes were stored. There are multiple Blocks of history records, the tester indicates the Block # being displayed. Using the arrow keys scrolls through the different data blocks, with the most negative number block being the oldest stored block.

To display History Data, do the following:

1. Select History Data from the OBD CONTROLS mode menu by pressing !.

2. The tester prompts you to turn the ignition OFF then ON.

3. The tester then displays the most recent History Block data.

BLOCK XX

IGN CNT1 XX

IGN CNT2 XX

ABS CNT XX

• IGN GNT1 = Drive Cycles

• IGN CNT2 = Drive Cycles

• ABS CNT = ABS Activation Counts

Submode F1: Function Test

The purpose of the FUNCTION TEST is to actuate the 4WAL system. The tester sends a signal to the

4WAL ECU which causes the FOUR WHEEL ANTILOCK system to cycle. If the system has a trouble code set, the tester displays, “CODES ARE SET REPAIR AND CLEAR CODES BEFORE TESTING”.

Repair the fault and clear the code before continuing. Select the TROUBLE CODE mode to clear the code.

The function test should also be run under the following conditions:

• After Bleeding the brake system, use the scantool to run the Functional Test four times while applying the brake pedal firmly.

• If any component is replaced which may have caused air to enter the BPMV, use the scantool to run the

Functional Test four times while applying the brake pedal firmly.

NOTE

If either of the above conditions has occurred, always, re-bleed all four wheels to remove the remaining air from the brake system.

To run the Function Test, do the following:

1. Select the FUNCTION TEST mode from the SELECT MODE menu by pressing !.

2. Complete the FUNCTION TEST by following the direction of each screen.

NOTE

The brake must continuously be applied to conduct the 4WAL function test. If the system does not cycle, check the brake lamp switch circuit.


Kelsey-Hayes 4WAL ABS

SELECT SYSTEM

F0: DATA LIST



!

FUNCTION TEST

CK FLUID LEVEL

CK/SET PRK BRAKE

PRESS ENTER


APPLY AND

HOLD BRAKE TO

ACTUATE TEST

D

TEST IS BEING

CONDUCTED

ADVANCE

HOLD

D

CODE XX

DESCRIPTION

NO CODES

TEST COMPLETE

FIGURE 5-91. Example of 4WAL Submode F1: Function Test

E

X

ACTIVE KEYS





Submode F2: DTC History

The DTC HISTORY function identifies which codes are stored within each History Block. The information is available in two ways. Stored Codes lists the Block # and all the codes stored in that block by number only. Enhanced Codes provides the code number and a text description of the codes stored in the block.

To display DTC History, do the following:

1. Select DTC HISTORY from the OBD CONTROLS mode menu by pressing @.

2. Select the DTC HISTORY display option; ) STORED CODES; ! for ENHANCED.

3. The tester prompts you to turn the ignition OFF then ON.

The tester then displays the Block # and the code information.


The Auto Bleed procedure should be performed after replacement of ABS Actuator or if air is trapped in unit. Bleeding should not be necessary if the fluid is not contaminated or no air is in the BPMV/EHCU.

There are internal bleed valves on each side of the BPMV/EHCU that open internal channels. Open the internal bleed valves 1/4 to 1/2 turn before bleeding. Should the actuator need bleeding, it must be bled after the master cylinder and before the wheel cylinders and calipers. Refer to Service Manual for step by step procedures.

LEFT INTERNAL

BLEED SCREW

(1 OF 2)

HPA BLEED VALVE



Submode F3: Tire Size Calibration

The Tire Size Calibration option has two sub functions, Read Tire Calibration and New Tire Size. The Read

Tire Calibration allows you to read the tire size calibration stored in the Vehicle Speed Sensor Calibrator

(VSS). The New Tire Size Calibration allows you to program a New Tire Size into the Vehicle Speed

Sensor Calibrator.

Depending on the application, the Vehicle Speed Sensor Calibrator is mounted either on the parking brake pedal bracket (G-Van), behind the glove box (L-Van, C/K Series and S-Series Truck) or next to the radio

(M/L Van).

The VSS Calibrator:

• Converts the Vehicle Speed Sensor AC sine wave (analog) signal to a DC square wave (digital) signal.

• Adjusts the Vehicle Speed Sensor frequency to compensate for tire size and rear-axle ratio options.

The EBCM uses the VSS calibrations processed signal to calculate rear wheel speed.

NOTE

If different sized tires or axle gear ratios are installed, the VSS calibrator must be replaced or reprogrammed, depending on model. Since the calibrator is an input to the vehicle’s electronic system; the customer may notice shift quality, cruise control, speedometer, odometer, engine control, electronic transfer case or ABS operational problems if the calibrator is not properly calibrated.

Only predetermined tire sizes can be selected. The arrow keys scroll the available tire size options. Three tire sizes appear at a time with the > symbol indicating the current selected size. Once the proper size is selected, press E to program the new tire size in the VSS.

Tire size calibration is only used on vehicles with a Kelsey-Hayes three sensor 4WAL ABS system utilizing a VSS circuit.

NOTE

If the following message is displayed when reading tire size, try programming the correct tire size from the available list.

UNABLE TO

RECOGNIZE TIRE

SIZE IN THIS

VERSION



VEHICLE TYPE?

5TH DIGIT OF VIN

F0: C/K/G/P

F1: S/T/M/L

Unable to read

UNABLE TO

RECOGNIZE TIRE

SIZE IN THIS

VERSION

SELECT NEW TIRE

F3: 8.00R-19.5

F4: 8.00 - 19.5

F5: 8.75R - 16.5

F0: READ TIRE CAL.

F1: NEW TIRE SIZE

!

SELECT NEW TIRE

F0: P225/75R15

F1: P215/75R15

F2: LT215/75R15

)

Able to read

TIRE CALIBRATION

XXXX/XXRXX

PRESS EXIT

TO CONTINUE

SELECT NEW TIRE

F6: 9.00 - 22.5

F7: LTP195/75R14

F8: P205/75R15

SELECT NEW TIRE

F9: MORE

SELECT NEW TIRE

F4: P195/75R15

F5: 205/75R14

F6: 205/75R15

SELECT NEW TIRE

F1: P245/75R16

F2: LT245/75R16

F3: P245/75R19.5

TURN IGNITION OFF,

THEN ON

SELECT NEW TIRE

F7: P215/65R15

F8: LT215/85R16

F9: MORE

(

SELECT NEW TIRE

F0: 225/70R19.5

F1: P235/65R15

F2: LT225/75R16

SELECT NEW TIRE

F3: P235/75R15

F4: LT235/75R15

F5: LT235/85R16

SELECT NEW TIRE

F4: P225/70HR15

F5: 7.50-16LT

F6: LT265/75R16

SELECT NEW TIRE

F7: P275/60R15

F8: P235/70R15

F9: MORE

(

SELECT NEW TIRE

F0: 31X10.5 R15

F1: 7.50R -16

F2: 7.50 -16

APPLY & HOLD

BRAKE TO

CALIBRATE EHCU

(

returns you to the first

Select New Tire menu.

CALIBRATING EHCU

Function Test runs.

TURN IGNITION OFF,

THEN ON

SELECT NEW TIRE

F7: P245/50RV16

F8: P245/60R15

F9: MORE

(

UNABLE TO

CALIBRATE

FIGURE 5-92. F3: Tire Size Cal

CALIBRATION

COMPLETE



Submode F6: ABS Motor

The ABS Motor verifies the ABS pump motor operates properly. If a malfunction is detected, the EBCM sets DTC(s), and the ABS indicator lamp turns on.

To perform the ABS Motor TEst, do the following:



3. Turn the ignition to RUN.

4. Select ABS Motor from the OBD CONTROLS menu.

5. Use the tester Up and Down arrow keys to turn ABS Motor ON and OFF.


Submode F0: PROM ID/SYS. ID

The PROM ID. function simply displays the 4WAL software version in the unit being tested.

NOTE

Software ID selection is not available on some systems.

To display 4WAL Software Version, do the following:

1. Select the PROM ID function from the OBD CONTROLS mode menu by pressing ).

2. The tester prompts you to turn the ignition OFF then ON (run position).

3. The tester then displays the 4WAL unit software version.

4WAL

VERSION ID

XXXXXXX

Submode F3: ECU Info

For Class 2 Kelsey-Hayes 4WAL ABS systems, this submode displays Software Date, Level, and Platform

ID.

Submode F4: VIN

For most Class 2 Kelsey-Hayes 4WAL ABS systems, this submode displays the Vehicle Identification

Number (VIN) as read from the Powertrain Control Module (PCM).



REAL TIME DAMPENING/VARIABLE

EFFORT STEERING (RTD/EVO)

The Real Time Dampening suspension system provides improved ride and handling for both on and offroad conditions. The RTD/EVO module monitors the body height compared to the wheel height, vehicle speed, steering wheel position and speed (of turning), lift/dive status, and the input from the tow/haul switch. The ECU levels the vehicle based on inputs from these sensors by either raising or lowering the pressure in the appropriate shock absorber(s).

The SCM (Suspension Control Module) also uses the Steering Wheel Position and Speed Sensor to control steering effort. The control module regulates the amount of current through the EVO solenoid. Steering assist is varied depending on vehicle speed and steering wheel position. At higher speeds, the amount of steering assist decreases, giving the driver improved “road feel.” At lower speeds, the amount of steering assist increases, making cornering and tight maneuvering easier.

System Components:

• SCM (Suspension Control Module)

• Compressor/Leveling Module (consists of a Pressure Sensor and Exhaust Solenoid)

• Compressor Motor Relay

• Steering Wheel Position and Speed Sensor

• EVO (Electronic Variable Orifice) Solenoid

• Shock Absorber Solenoid Valves and Exhaust Valve

• Body to Wheel Position Sensors



MODE F2: DTCS

Diagnostic Trouble Codes are stored in the ECU memory and can be displayed on the scantool. The SCM also records when the DTC was stored (current vs. history DTC). In addition to the DTC number, a brief description of the DTC can be displayed. DTCs can also be cleared from the ECU memory. Please refer to the applicable section in common test mode descriptions.




The snapshot mode helps isolate problems of intermittent operation. Information is captured before and after a trigger condition. Manual or automatic triggers can be selected. You can review a stored snapshot from this menu. Please refer to the applicable section in common test mode descriptions.


The OBD Controls mode allows the technician to activate various components in the RTD/EVO system(s) in order to diagnose problems and verify proper system operation. When in this mode, the following tests can be performed:

• RTD Controls

• Solenoid Tests

• Compressor Test

• SRC Lamp Test

• EVO Controls

• VES Solenoid

SUBMODE F0: RTD CONTROLS

F0: Solenoid Test

Solenoid Test allows the technician to cycle each individual shock absorber solenoid, as well as the system

Exhaust Solenoid ON and OFF.

To perform the test(s), do the following:

1. Press F4: OBD Controls from the SELECT MODE menu.

2. Press F0: RTD Controls from the SELECT SYSTEM menu.

3. Press F0: Solenoid from the SELECT CONTROL menu.

4. Press the Up Arrow key to turn the selected Solenoid ON.

5. Press the Down Arrow key to turn the selected Solenoid OFF.

F1: Compressor Test

The Compressor Test allows a technician to command the RTD compressor ON and OFF.

To perform the test, do the following:

1. Press F4: OBD Controls from the SELECT MODE menu.

2. Press F0: RTD Controls from the SELECT SYSTEM menu.

3. Press F1: Compressor from the SELECT CONTROL menu.


F4: OBD Controls

4. Press the Up Arrow key to turn the Compressor ON.

5. Press the Down Arrow key to turn the Compressor OFF.



Teves Mark II ABS 5. Selecting and Operating Test Modes

TEVES MARK ABS SYSTEMS

TEVES MARK II ABS

The Teves Mark II antilock brake system was introduced on GM vehicles starting in 1986 and continued production through 1991. During the Teves Mark II production life, two different systems were produced.

The first Teves Mark II ABS system started production in 1986 and was NOT equipped with ABS diagnostic codes. ABS diagnostics for this system requires 7 (seven) different lamp sequence checks and a

Lamp Sequence Chart along with the vehicle service manual to pinpoint the ABS failure.

The first Teves Mark II ABS system has a red “BRAKE” warning lamp and an amber “ANTILOCK” indicator lamp on the instrument panel. The lamps light in various combinations to indicate normal and abnormal brake system conditions.

The first Teves Mark II ABS system includes the following models:

• 1986-1990 Pontiac A-Body

• 1986-1988 C/H body

The second Teves Mark II ABS system started production in 1988 and included ABS code diagnostics by flashing ABS codes through the Antilock lamp located in the instrument cluster.

The second Teves Mark II ABS system included the following models:

• 1988-1990 Pontiac E/K-Body

• 1989-1990 C/H body

TEVES MARK II LAMP SEQUENCE DIAGNOSTICS

The first Teves Mark II ABS system has a red “BRAKE” warning lamp and an amber “ANTILOCK” indicator lamp on the instrument panel. The lamps light in various combinations to indicate normal and abnormal brake system conditions.

The first Teves Mark II ABS system includes the following models:

• 1986-1990 Pontiac A-Body

• 1986-1988 C/H body

Overview of Diagnostics

1. Make preliminary checks. If a cause for an abnormal condition is found, make the repairs at this point.

2. Perform the Lamp Sequence Check on

page 311 .

• On Vehicles not equipped with ABS code diagnostics, (1986-1990 Pontiac A-Body, 1986-1988 C/H body), perform Lamp Sequence Check.



• On vehicles that have ABS code diagnostics, (1988-1990 E/K body, 1989-1990 C/H body), perform the Functional Check on

page 311 .

3. Based on the results of the lamp sequence or functional checks, check the appropriate component(s) and make repairs.

To perform the Lamp Sequence Check, do the following:

1. Turn the ignition switch to the “OFF” position for 15 seconds.

2. Turn the ignition switch to the “RUN” position. Observe the “BRAKE” and “ANTILOCK” lamps:

• Both may light for approximately 30 seconds. If this occurs, wait until both lamps turn “OFF” and repeat Step 1 and this step.

• Both may light for more than 30 seconds, If this occurs, go to step 3.

• The “ANTILOCK” lamp should light for 3 to 6 seconds and then turn “OFF”. The “BRAKE” and

“ANTILOCK” lamp should not light (Parking brake released). If this occurs, go to step 3.

3. Turn the ignition switch to the “Start” position. Observe the “BRAKE” and “ANTILOCK” lamps. They should both be lit.

4. When the engine starts, release the ignition switch to the “Run” position. Observe the “BRAKE” and

“ANTILOCK” lamps.

• The “BRAKE” lamp should turn “OFF” immediately.

• The “ANTILOCK lamp should light for 3 to 6 seconds and then turn “OFF”.

5. Drive the vehicle above 20 miles per hour for a short time. Observe the “BRAKE” and “ANTILOCK” lamps:

• Both lamps should remain “OFF”.

• Note the conditions related to either lamp lighting.

6. Stop the vehicle using a normal brake application. Observe the “BRAKE” and “ANTILOCK” lamps:



7. Allow the vehicle to idle for several seconds. Observe the “BRAKE” and “ANTILOCK” lamps:



8. Compare the operation of the “BRAKE” and “ANTILOCK” lamps to

Table 5-2

.

9. If the lamp operation is not normal, use Table 5-2

to identify lamp and braking sequence patterns identified from the above 7 tests. Then use the appropriate service manual to find the cause of the abnormal condition.



Vehicle

Status

• Ignition stopped

• Ignition

ON

Ignition

ON

• Starter engaged

• Engine running immediately after start

• Transaxle in “park”

Cranking Running

• Vehicle being driven at approx. 20 mph

• Transaxle in “drive”

Moving

• Normal brake appl.

• Vehicle stopped after normal brake appl.

• Transaxle in “drive”

Braking Stopped

• Engine idling

• Transaxle in “park”

Idle

ANTI-

LOCK

(AMBER)

BRAKE

(RED)

TABLE 5-2. Indicator Lamp Sequence - Vehicle Status a. Light shading: “ANTILOCK” lamp ON

Dark shading: “BRAKE” lamp ON

Blank areas (no shading): Lamp OFF

Partially shaded blocks: Lamp ON for part of stats period

To perform the Ignition ON check, do the following:

1. With charged accumulator, “ANTILOCK” light comes ON for 3-5 seconds with ignition ON. If accumulator is discharged, lamp may stay ON for up to 30 seconds.

2. “BRAKE” and “ANTILOCK” lamps both turn ON during cranking.

3. Immediately after engine starting, “ANTILOCK” lamp turns ON for 3-5 seconds.

4. Both lamps should remain OFF at all other times.



AWD Differential

“LOCK-NORMAL”

Switch

“BRAKE’

“ANTI-

LOCK”

Red OFF

Amber ON,

THEN

OFF

Amber OFF

ON OFF OFF

ON ON, OFF

THEN

OFF

OFF OFF OFF “LOCK-

NORMAL-

SWITCH”

“LOCK” Amber OFF OFF OFF OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

OFF

ON

OFF

ON,

THEN

OFF

FLASH OFF

OFF OFF OFF OFF,

THEN

ON

ON,

THEN

OFF

TABLE 5-3. Warning/Indicator Lamp Sequence a. “LOCK-NORMAL” switch set to “NORMAL”.

To perform the Normal Sequence check, do the following:

1. With ignition ON, “ANTILOCK” warning lamp comes ON for 3-5 seconds if accumulator is charged.

“ANTILOCK” warning lamp may stay ON for up to 30 seconds if accumulator is discharged.

2. “BRAKE” and “ANTILOCK” warning lamps turn ON during cranking.

3. Immediately after the engine starts, “ANTILOCK” warning lamp is ON for 3-5 seconds.

4. When “LOCK-NORMAL” switch is moved to “LOCK”, amber switch indicator lamp flashes.

5. The “LOCK” and “ANTILOCK” lamps turn ON when the transfer case differential vacuum-actuated lock locks the differential.

6. When “LOCK-NORMAL” switch is moved back to “NORMAL”, “ANTILOCK” warning lamp remains ON for 3-5 seconds and then go OFF. Switch indicator lamp immediately stops flashing and remains OFF.

7. The “LOCK” indicator lamp goes OFF when the transfer case differential spring mechanism unlocks the differential.

8. All four lamps remain OFF at all other times.

NOTE

Refer to Lamp Sequence Check on

page 311 before using

Table 5-4

.



SEQ

1

2

LAMP SEQUENCE

Lamps

ANTILOCK

BRAKE

Ign ON Cranking Running Moving Braking Stopped Idle

Lamps

ANTILOCK

BRAKE


SYMPTOM

DESCRIPTION

Normal Lamp sequence with:

• Excessive pedal travel or spongy pedal.

• Antilock braking operation or valve cycling during normal stop on dry pavement.

• Poor vehicle tracking during antilock braking.

See #1,

Table 5-5 .

Continuous

“ANTILOCK”

Normal “BRAKE” lamp

See #2,

Table 5-5 .

3

Lamps

ANTILOCK

BRAKE

Ign ON Cranking Running Moving Braking Stopped Idle “ANTILOCK” lamp comes ON after vehicle starts moving


See #3,

Table 5-5

4

Lamps

ANTILOCK

BRAKE

Ign ON Cranking Running Moving Braking Stopped Idle No “ANTILOCK” lamp while cranking

Normal “BRAKE” lamp.

See #4,

Table 5-5

5

Lamps

ANTILOCK

BRAKE

Ign ON Cranking Running Moving Braking Stopped Idle No “ANTILOCK” lamp


See #5,

Table 5-5

6

Lamps

ANTILOCK

BRAKE

Ign ON Cranking Running Moving Braking Stopped Idle Intermittent

“ANTILOCK” while driving


See #6,

Table 5-5

7

Lamps

ANTILOCK

BRAKE

Ign ON Cranking Running Moving Braking Stopped Idle Continuous

“ANTILOCK” lamp

Continuous “BRAKE” lamp

See #7,

Table 5-5

TABLE 5-4. Lamp Sequence Table



SEQ

8

LAMP SEQUENCE

Lamps

ANTILOCK

BRAKE


SYMPTOM

DESCRIPTION

Continuous

“ANTILOCK”


See #8,

Table 5-5

9

Lamps

ANTILOCK

BRAKE

Ign ON Cranking Running Moving Braking Stopped Idle Normal “ANTILOCK” lamp


See #9,

Table 5-5

TABLE 5-4. Lamp Sequence Table



1

SEQ

NO

2

3

4

5

6

7

8

9

SYMPTOM DESCRIPTION

Excessive pedal travel or spongy pedal

ANTILOCK braking operation or valve cycling during normal stop on dry pavement

Poor vehicle tracking during ANTILOCK braking

Continuous “ANTILOCK”


“ANTILOCK” lamp comes ON after vehicle starts moving

No “ANTILOCK” lamp while cranking


No “ANTILOCK” lamp while


Intermittent “ANTILOCK” while driving


Continuous “ANTILOCK” lamp


Continuous “ANTILOCK”


Normal “ANTILOCK” lamp


PERFORM SYMPTOM DIAGNOSIS TESTS

FOUND IN VEHICLE SERVICE MANUAL

Antilock lamp inoperative at key-on

Antilock lamp DIM or inoperative

Brake lamp inoperative during cranking

Valve cycling (chatter) during normal stops

Low or spongy brake pedal

Poor vehicle tracking during Antilock Stops

Wheel speed sensor output

Right rear wheel speed sensor output

Left front wheel speed sensor output

Left rear wheel speed sensor output

Right front wheel speed sensor output

Solenoid valves

Left front valve

Right front valve

Rear valves

Pinout check

Must use break out box J-35592

Left front wheel speed sensor

Right front wheel speed sensor

Right rear wheel speed sensor

Left rear wheel speed sensor

“ANTILOCK” lamp DIM or INOP during cranking

- Must use J-35592 Pinout box

“ANTILOCK” lamp INOP at key-on

-Must use J-35592 Pinout box

“ANTILOCK” lamp ON and NO ABS codes present

-Must use J-35592 Pinout box

“BRAKE” and “ANTILOCK” lamps ON

“BRAKE” lamp ON

(NO “ANTILOCK” lamp or ABS CODES)

“BRAKE” lamp ON

(NO “ANTILOCK” lamp or ABS CODES)

TABLE 5-5. Lamp Sequence Symptoms



TEVES MARK II ABS USING SCANTOOL

The second Teves Mark II ABS system started production in 1988 and included ABS code diagnostics by flashing ABS codes through the Antilock lamp located in the instrument cluster.

The second Teves Mark II ABS system included the following models:

• 1988-1990 Pontiac E/K-Body

• 1989-1990 C/H body

Overview of Diagnostics

1. Make preliminary checks. If a cause for an abnormal condition is found, make the repairs at this point.

2. Perform Functional Check.

3. Based on the results of the lamp sequence or functional checks, check the appropriate component(s) and make repairs.

Functional Check

To perform the Functional Check (for vehicles with ABS diagnostics), do the following:

1. Turn the ignition switch to the “Run” position: a. Allow the accumulator to charge (30 second maximum). b. Observe the “BRAKE” and “ANTILOCK” lamps. Both should turn “OFF” within 30 seconds.

2. Turn the ignition switch to the “OFF” position.

3. Connect scantool to the ALDL connector located in the dash and select the proper year and VIN digit.

4. Select the “Flash Codes” selection from the tester main menu.

5. Turn the ignition to the “RUN” position a. Observe the “ANTILOCK” Lamp.

• If the lamp lights for 4 seconds and then turns “OFF” (and remains off), no trouble codes are stored.

• If the lamp lights for 4 seconds and then starts flashing, one or more trouble codes are stored.

6. Read the Trouble Codes. a. If the lamp flashes, count the number of flashes and wait for a 3 second pause. This is the first digit of the code. Then count the flashes after the 3 second pause. This is the second digit. Count only the number of times the lamp turns on and off for the second digit. After the second digit, the lamp stays lit continuously. Do not count this as a code digit.

• The lamp flashes up to seven codes currently present or stored in memory.

• After the “ANTILOCK” lamp stops flashing the codes and lights continuously, press N to exit from DISPLAY ABS CODES. Without turning the ignition off, press Y to re-enter and read any other codes.



ON

“ANTILOCK”

LAMP

STATUS

OFF

IGNITION

OFF

EXAMPLE:

• ABS CODE 34 PRESENT

• CODES ACTIVATED BEFORE KEY ON

4-SEC

DELAY

FIRST DIGIT

OF CODE = 3

3-SEC

PAUSE

SECOND DIGIT

CODE = 4

CONTINUOUS

LAMP

KEY-ON END OF CODE

7. Enter the Trouble Codes Into Scanner.

Enter any codes flashed by the “ANTILOCK” lamp into the scanner. The “ANTILOCK” lamp flashes continuously until x is pressed on the tester.

8. Clear the Trouble Codes.

The Teves Mark II ABS module does not allow codes to be cleared until repairs have been made.

Therefore, do not try to clear codes until repairs are finished. Disconnecting the battery or the ABS module connector does not clear Teves Mark II ABS diagnostic codes. After repairs have been completed, clear codes by driving the car above 18 MPH. Then, repeat the code-reading sequence to be sure that all problems are corrected.


Teves Mark II ABS

MODE F0: HOW TO READ


MAIN MENU

VEHICLE REQUIRES

GM 12/14 PIN

ADAPTER

P/N 02001384

D

CONNECT ADAPTER

TO DIAG. CONNECT

UNDER DASH

PRESS [ENTER]

E

SELECT MODE

F0: HOW TO READ

F1: FLASH CODES

F2: DTC LIST

)

IF THE ABS LAMP

TURNS ON FOR 4

SECONDS & THEN

TURNS OFF (AND

D

REMAINS OFF).

NO CODES ARE

STORED. DO NOT

COUNT THIS AS

D

A CODE DIGIT.

IF THE ABS

LIGHT REMAINS

ON FOR 4 SEC.

D

AND STARTS

FLASHING 1 OR

MORE CODES MAY

BE PRESENT.

D

A SERIES OF

FLASHES FROM THE

ABS LAMP

REPRESENTS THE

D

FIGURE 5-93. How To Read

D

THE VEHICLE ABS

CAN STORE UP TO

7 CODES IN

MEMORY.

D

PRESS [EXIT]

TO CONTINUE

X

1ST DTC DIGIT.

AFTER A 2.5 SEC.

PAUSE THERE IS A

SERIES OF

D

FLASHES WHICH

REPRESENT THE

2ND DTC DIGIT

FOLLOWED BY A

D

CONTINUOUS LAMP.

EACH DTC DIGIT

IS FLASHED ONCE

BEFORE MOVING

D

ONTO THE NEXT.

AFTER ALL DTC’s

HAVE BEEN

FLASHED, THE

D

SEQUENCE WILL

REPEAT.


Teves Mark II ABS



MAIN MENU


GM 12/14 PIN

ADAPTER

P/N 02001384

D

CONNECT ADAPTER


UNDER DASH

PRESS [ENTER]

E


WILL FLASH DTC’s

PRESS [ENTER]

TO BEGIN

E

TURN IGNITION

“ON” THEN PRESS

[ENTER]

E

SELECT MODE

F0: HOW TO READ

F1: FLASH CODES

F2: DTC LIST

!

TURN IGNITION

“OFF” THEN PRESS

[ENTER]

E

FIGURE 5-94. Flash Codes

ENTER DTC NUMBER

??

[ENTER]

E

DTC 24

RIGHT FROM WHEEL

SPEED SENSOR

[ENTER]

E

ADDITIONAL

TROUBLE CODES?

[YES/NO]

N

= ADVANCE CODE

= HOLD CODE

EXIT = QUIT

ENTER = SUMMARY

Y


Teves Mark II ABS

MODE F3: REVIEW DTCS


MAIN MENU

X


GM 12/14 PIN

ADAPTER

P/N 02001384

D

CONNECT ADAPTER


UNDER DASH

PRESS [ENTER]

E

SELECT MODE

F0: HOW TO READ

F1: FLASH CODES

F2: DTC LIST

D

SELECT MODE

F3: REVIEW DTC

F4: CLEAR DTC

#

= ADVANCE CODE

= HOLD CODE

EXIT = QUIT

ENTER = SUMMARY

E

DTC SUMMARY

XX XX XX XX XX

U

, D

DTC 12

EGR SYSTEM OR EGR

CKT FAILURE

FIGURE 5-95. Review DTCs


Teves Mark II ABS

MODE F4: CLEAR DTCS


MAIN MENU


GM 12/14 PIN

ADAPTER

P/N 02001384

D

CONNECT ADAPTER


UNDER DASH

PRESS [ENTER]

E

SELECT MODE

F0: HOW TO READ

F1: FLASH CODES

F2: DTC LIST

D

SELECT MODE

F3: REVIEW DTC

F4: CLEAR DTC

$

F0: FROM ABS

F1: FROM TESTER

!

DTC DATA HAS

BEEN CLEARED

FROM TESTER

[EXIT]

X

)

FIGURE 5-96. F4: Clear DTCs

THE TEVES II ABS

SYSTEM WILL NOT

ALLOW CODES TO

BE CLEARED UNTIL

D

ALL ABS REPAIRS

HAVE BEEN

COMPLETED

D

CODES ARE

CLEARED BY

DRIVING ABOVE 18

MPH.

D

REPEAT THE FLASH

CODE SEQUENCE

TO VERIFY ALL

D

PROBLEMS HAVE

BEEN CORRECTED


Teves Mark IV ABS/TCS 5. Selecting and Operating Test Modes

TEVES MARK IV ABS/TCS

The Teves Mark IV wheel Antilock Brake System (ABS) and Traction Control System (TCS) are designed to prevent wheel lock-up during heavy braking and accelerated slip/traction at speeds less than 25 MPH.

The ABS allows driver to maintain steering control while stopping vehicle in shortest distance possible, while the TCS prevents wheels from spinning excessively during acceleration.

Major components include the following: pump motor, Pressure Modulator Valve (PMV) assembly, fluid reservoir with integral filter, wheel speeds sensors (4), fluid level sensor, Electronic Brake Control Module

(EBCM) or Electronic Brake and Traction Control Module (EBTCM), brake booster/master cylinder assembly, and “BRAKE” and “ANTILOCK” warning lights.

NOTE

When performing serial data tests on the Teves Mark IV ABS, the operation of the system is altered significantly from its normal mode. This is applicable to all operating modes including Data List and Snapshot. In this altered mode, all ABS braking is inhibited, leaving the vehicle limited to conventional braking. In addition, the Teves ABS controller does not set trouble codes during diagnostic mode of operation, even if the trouble code conditions are present.

ANTILOCK WARNING LIGHT

ANTILOCK and TRACTION OFF (if equipped) warning lights illuminate when vehicle is first started and when a malfunction in ABS or TCS is detected. If either light remains on longer than approximately 5 seconds after vehicle is started, or if they illuminate while driving ABS is disabled, but normal braking continues. If the brake warning light comes on, check parking brake and brake fluid level. Brake failure is indicated.

NOTE

Intermittent history codes do not illuminate the amber “ANTILOCK” warning light.



MODE F2: DTCS







Submode F0: Solenoid Tests

The Solenoid Test for the Teves Mark VI system allows you to manually control the actuation of the hydraulic wheel circuit valves for each wheel. You can select between actuation of the pressure hold function or the pressure release function for each solenoid. The pressure hold function holds the pressure from reaching the wheel and prevents the locking up of the wheel when the brake pedal is pressed. The pressure release function releases pressure from a wheel which is being held by the brake allowing the wheel to be turned.

Once a solenoid has been commanded ON, the tester automatically turns it OFF after 20 seconds to avoid damage to the solenoid. If the same solenoid is commanded ON again in less than 30 seconds, an

‘INHIBITED’ message is displayed until 30 seconds has elapsed from the time the solenoid was last turned

OFF.

To select the Solenoid Test, do the following:


2. Select SOLENOID TEST by pressing ).

3. The tester display confirms that you are ready to perform the manual control of ABS solenoids.

4. After 4 seconds, or an U keypress, the tester displays the keys used to manually control the solenoids.

5. Press Y to display a menu of functions that can be controlled. Press the key to the left of the solenoid you wish to test.

6. The tester displays the solenoid selected, the commanded state of the solenoid, and the wheel speeds.

Use U to turn the solenoid ON, or D to turn the solenoid OFF. The tester automatically turns the solenoid OFF after 20 seconds and inhibits it from being turned on again for 30 seconds.

7. Press X to return to the menu to select a different solenoid to control, or press X twice to return to the OBD CONTROLS menu.



SELECT TEST:


F1: AUTO BLEED

)

MANUAL CONTROL

OF ABS SOLENOIDS

= TURN SOL. ON

= TURN SOL. OFF

YES TO CONTINUE

y

F0: LF HOLD

F1: RF HOLD

F2: LR HOLD

F3: RR HOLD

F4: LF RELEASE

F5: RF RELEASE

F6: LR RELEASE

F7: RR RELEASE

)

LF HOLD

CMD STATE: OFF


0 MPH 0 MPH

u d

LF HOLD

CMD STATE: ON


0 MPH 0 MPH

FIGURE 5-97. F0: Solenoid Tests

LF HOLD

INHIBITED


0 MPH 0 MPH

If the solenoid is commanded ON again in less than 30 Seconds.

)

Y

) & u d x

ACTIVE KEYS

Select SOLENOID TEST.

Continue with the Solenoid Test.

Select the solenoid you wish to test.

Control solenoid ON.

Control solenoid OFF.





The Auto Bleed test for the Teves Mark IV System runs through three procedures. First, the ABS pump motor is energized for a specified amount of time. Second, the ABS solenoid is energized and third, the

ABS solenoid is de-energized. These procedures force any air out of the ABS actuator and into the brake lines. When the Auto Bleed Test is completed, the brake system must be bled normally at each wheel cylinder or piston as per the repair manual procedure.

The test normally takes approximately 60 seconds to perform. If the “PROCESS COMPLETE” message is not displayed within 2 minutes, you probably have a bad connection to the DLC. Check the connection, cycle the ignition and cycle power to the tester before rerunning the test.



2. Select the AUTO BLEED test by pressing !.

3. The tester display confirms that you are ready to perform the AUTO BLEED test. After 4 seconds, the display instructs you to bleed the brake system normally, then press E to continue the AUTO

BLEED test.

4. A caution message to set the brakes and block the wheels is displayed. Set the brake and block the wheels, then press E.

5. The tester informs you that the procedure takes 60 seconds, then begins the test when you press U.

“PLEASE WAIT” is displayed while the tester performs the Pump Running, Energizing Valves, and Deenergizing Valves tests.

6. At the end of the tests the tester informs you that the process is complete and that you should bleed the brake system normally, then press X .




SELECT TEST


F1: AUTO BLEED

!

SOLENOID BLEED

AND CHECKOUT

TEST

4 Seconds

BLEED BRAKE SYS.

NORMALLY, THEN

PRESS [ENTER]

TO CONTINUE

E

SET BRAKES,

BLOCK WHEELS,

THEN PRESS

[ENTER]

E

PLEASE WAIT

THIS PROCEDURE

WILL TAKE

60 SECONDS

U

* * PLEASE WAIT * *

PUMP RUNNING


ENERGIZING

VALVES


DE-ENERGIZING

VALVES

PROCESS COMPLETE

BLEED BRAKE SYS.

NORMALLY, THEN

PRESS [EXIT]

FIGURE 5-98. Teves ABS Auto Bleed Test

!

E

X

ACTIVE KEYS

Select AUTO BLEED Test.

Continue with the AUTO BLEED Test.

Return to the OBD CONTROLS menu.



Submode F2: TCS System Test

The TCS SYS. TEST performs a system self-test and status of the TCS system and related ABS components.

NOTE

Refer to the appropriate service manual and follow instructions when performing the TCS System Test.

To select the TCS System Test, do the following:

NOTE

The TCS system test function does not allow you to complete the self-test if any of the following is true:

• Any ABS DTCs present

• Brake pedal is depressed

• Engine is not running.

1. From the OBD CONTROLS menu, select “TCS SYS. TEST” by pressing @.

The TCS self-test is initiated if the engine is running, there are no DTCs, and the brake pedal is not depressed.

If the TCS system passes the self-test, the tester displays “TCS PASSED SYSTEM TEST.” If it fails, it displays “TCS FAILED. CHECK THE EBTCM FOR DTCs.”

2. Press the U key to return to the SELECT MODE menu.


Teves Mark IV ABS/TCS 5. Selecting and Operating Test Modes u

TCS Passed

(no problems)

TCS PASSED

SYSTEM TEST

SELECT TEST

F0: SOLENOID

F1: AUTO BLEED

F2: TCS SYS. TEST

@

Engine Not Running

ENGINE MUST BE

RUNNING TO

CONTINUE

DIAGNOSTICS.

u

ABS DTC(s) Present

TCS FAILED.

CHECK THE EBTCM

FOR DTC(S).

u

Brake Pedal is

Depressed

TCS UNAVAILABLE

WHEN BRAKES ON.

IF BRAKE IS OFF,

CHECK BRAKE

u

SWITCH AND PMV

PRESSURE SWITCH

(IF EQUIPPED)

CIRCUITS.

u

SELECT TEST

F0: SOLENOID

F1: AUTO BLEED

F2: TCS SYS. TEST

FIGURE 5-99. F2: TCS System Test

@ e u x

ACTIVE KEYS

Select TCS SYS. TEST.

Initiate a procedure.

Increment procedure steps.



6. FINISHING UP

After using the application, do the following:

1. If the repairs are complete, clear the codes from memory before test driving to see if they recur or before releasing the vehicle to the customer.

• If you have cleared the codes for a component but the codes are still set, then the conditions which caused the codes to be set may still be present. Refer to the OEM service manual to isolate the problem.

2. If the repairs are not yet complete, or if you want to continue testing at a later time, do not clear the codes from memory. Print a copy of the codes or write the codes down for comparison to the codes displayed when testing is resumed.

3. Disconnect the tester from the cigarette lighter plug or the battery terminal adapter.

4. Disconnect the cables and adapters from the vehicle’s DLC. You may want to inspect the cable, connector, and cigarette lighter for any damage or corrosion.

5. Store all hardware components in the tester storage case.

NOTE

If the tester becomes dirty, clean it by wiping it with a rag dampened with mild detergent or hand soap. Avoid using harsh, petroleum-based cleaning solvents such as acetone, benzene, and trichloroethylene, as they may damage the tester.

Although the tester is water resistant, it is not waterproof, so be sure to thoroughly dry off the tester prior to storage. Do not submerge the tester in water.


A. ABS COMMUNICATION

This appendix discusses the communications between electronic components within GM vehicles as they relate to the Antilock Brake Systems. The purpose of this discussion is to give you additional insight into the system in order to aid in the intuitive approach to trouble-shooting.

The ABS systems supported by this cartridge contain one or more components connected to a Serial Data

Link (SDL). The SDL provides two functions for the vehicle. It provides a means of sharing data between components for normal operation of the vehicle. It also provides a means for an external test device (such as the tester) to communicate with the components for the purpose of performing diagnostics on the components. In some cases, the ABS controller is the only component connected to the SDL, while in other cases a variety of components share the SDL. In addition to the ABS, these components may include the

Engine Control Module (ECM), the Body Computer Module (BCM), the Instrument Panel Cluster (IPC) and the Heating Ventilation and Air Conditioning (HVAC) module.

The tester gains access to the SDL via pin M or L on the Data Link Connector (DLC). Once it is connected, it becomes part of the vehicle’s electronic system, the same as the other components.

The testing which the tester performs on the ABS systems is usually done with the SDL components in the diagnostic mode (normal mode on some vehicles). In this mode, the tester becomes the “master” device of the Serial Data Link and controls communications on the SDL. This means that the tester can send commands to the components (ECM, IPC and ABS) and have them respond accordingly. The tester can command a component to perform a special function (e.g. command the ABS controller to turn on a solenoid), or it can command the component to send it certain information (e.g. ABS trouble code information).

One diagnostic mode is the DLC data list mode. In this mode, the tester commands the component to send it a set of diagnostic parameters. The DLC data list parameters are displayed by the tester in the DATA LIST mode (F0) and saved by the tester during the SNAPSHOT mode (F3). In addition, the DLC data list contains the DTCs information which is displayed during mode (F2). The data which is read by the tester is determined by the component being tested. As a result, the data available for display is different for each system.


B. IF YOU’RE HAVING A

PROBLEM

This section is intended to help you get back on track if the tester appears to be operating abnormally.

Examples of most of the displays which you might see under abnormal conditions are shown. In addition, the most likely cause for the condition is given as well as other possible causes and recommendations on how to isolate or eliminate the problem.

BLANK SCREEN

Most Likely Cause

• No power is applied to the tester.

Other Possible Causes

• Tester power supply is malfunctioning.

Recommendations

• Plug the tester into another vehicle to verify proper operation.

• Check for the 12 volt power at the cigarette lighter.

• Check for proper polarity of 12 volt power (center conductor should be positive).

• Check fuse in tester DC power cable cigarette lighter plug.


Displays Solid Bars

DISPLAYS SOLID BARS

B. If You’re Having a Problem


• Cartridge was inserted while power was applied to tester.


• Two master cartridges are installed.

• Master cartridge is malfunctioning.

• Tester is malfunctioning.

Recommendations

• Unplug connector from cigarette lighter and plug it back in.

• Make sure that only one master cartridge is installed in the tester.

• Remove all cartridges and see if “MASTER CARTRIDGE MISSING OR MALFUNCTIONING” message is displayed. If it is, try installing another master cartridge.

MASTER CARTRIDGE MISSING OR

MALFUNCTIONING

MASTER CARTRIDGE

IS MISSING OR

MALFUNCTIONING


• Master cartridge is not installed.


• Dirty contacts on the master cartridge connector.


Recommendations

• Verify that a master cartridge is installed.


Wrong Display after Power Applied

• Clean contacts on master cartridge connector with methyl (wood) alcohol.

• Try a different master cartridge.


WRONG DISPLAY AFTER POWER APPLIED

GM 88-93 CHASSIS

(VER. 1.1)

SELECT

MODEL YEAR: 19??


• Wrong master cartridge is installed.




Recommendations

• Verify that “GM 86-00 CHASSIS” Cartridge (Ver. 3.0) is installed in the bottom slot of the tester and that there isn’t a master cartridge (e.g. “ALL 81-86 ECM”) in the top slot.

• Try another cartridge.

• Remove the master cartridge and perform the tester Self-test (refer to the tester OPERATORS

MANUAL).

NO DATA RECEIVED FROM ABS

CONTROLLER

TROUBLE CODES


FROM ABS ECU


• Tester cable is not plugged securely into DLC.


Install Bosch ABS Adapter B. If You’re Having a Problem


• Ignition switch is not in “RUN”.

• Ignition has been cycled without cycling tester power (Bosch ABS only)

• Serial data link is shorted or open-circuited.

• ABS is malfunctioning.


Recommendations

• Verify that tester is plugged securely into DLC.

• Cycle power on the tester and then cycle the ignition.

• Verify that ignition is in “RUN”.

• Check for serial data link shorted or open.

• If you are testing a Bosch ABS system, also look for a shorted or open diagnostic enable circuit (pin H on the DLC cable).

• Remove the cartridge and perform the tester Self-test (refer to the tester OPERATORS MANUAL).

INSTALL BOSCH ABS ADAPTER

DATA LIST MODE

INSTALL BOSCH

ABS ADAPTER


• Bosch ABS Adapter not installed.


• Bosch ABS Adapter malfunctioning.


Recommendations

• Verify that Bosch ABS Adapter is plugged securely into DLC cable.

• Check continuity on Bosch ABS Adapter:

• Pins C and D on tester end connected together

• Pin A on tester end connected to pin A on vehicle end

• Pin B on tester end connected to pin H on vehicle end

• Pin M on tester end connected to pin M on vehicle end

• Remove the cartridge and perform the tester Self-test (refer to the tester OPERATORS MANUAL).


No Communication

NO COMMUNICATION

No communication with vehicle.

Check DLC or

ECU not present.


• Tester cable has come loose from DLC.


• Ignition switch has been turned “OFF”.

• Cable is not plugged securely into tester.


• ABS controller is malfunctioning.

Recommendations


• Verify that tester is plugged securely into DLC.

• Check for serial data link shorted or open.


CHECK FOR OPEN/SHORT CIRCUIT

CHECK FOR OPEN/SHORT

IN VSS CIRCUIT OR

BLOWN FUSE

OR

RWAL


4WAL TO ALDL SHORT

ALDL WIRING OPEN

IGN

4WAL


• Ignition switch is not in “RUN”.


• Tester cable is not plugged securely into RWAL/4WAL ADAPTER connector.

• RWAL/4WAL ADAPTER is not plugged securely into DLC.

• RWAL/4WAL Adapter power plug is not connected to power port on the back of the DLC cable.

• Cable is not plugged securely into tester.



Check Class 2 Communication Hardware

• ECU is malfunctioning.


Recommendations


• Verify that tester is plugged securely into the RWAL/4WAL ADAPTER!!!

• Verify that ADAPTER is plugged securely into the DLC.

• Verify Adapter power plug is connected to the back of the DLC.

• Perform RWAL/4WAL ADAPTER TEST.

• Check continuity on serial data link.


CHECK CLASS 2 COMMUNICATION

HARDWARE

Check Class 2

Communication

Hardware

[EXIT]


• Tester does not have the OBD II hardware kit installed. See

Adapter and Adapter Cable Configurations on page 80.


• OBD II Interface Cartridge not seated properly in the top cartridge slot of the Tech 1A.

• OBD II hardware is malfunctioning.

Recommendations

• Verify that the OBD II hardware is installed in tester (refer to

Chapter 3

).

• Re-seat the Tech 1A interface cartridge.

• Unplug and reset the tester and try the vehicle selection again.

• Reselect the correct vehicle.


Keyboard or Display Locked Up or Program Intermittently Returns to Title Screen B. If You’re Having a Problem

KEYBOARD OR DISPLAY LOCKED UP OR

PROGRAM INTERMITTENTLY RETURNS

TO TITLE SCREEN

GENERAL MOTORS

CHASSIS

1986-2004

Vx.x [ENTER]


• DLC cable loose.


• Master cartridge has loose or dirty contacts.

• Cigarette lighter power intermittent.

• Tester is malfunctioning

Recommendations

• Cycle power to the tester (unplug and re-plug the cigarette lighter adapter).

• Check tester cartridge socket and cartridge edge connector.

• Check DLC cable and connector for wear and corrosion.

NOTE

REPAIR SERVICE

If you are having a problem with your tester unit, read the operating instructions carefully to ensure that you are operating the unit properly. Avoid the inconvenience of returning a non-defective unit for repair. It is advisable to exercise the Self-test procedures in the tester Operators Manual to determine if a problem exists. If it is determined that a problem exists or you have any questions, call 1-800-321-4VTX (USA).


C. DATA LIST PARAMETERS

The tester is capable of displaying data parameters in Data List and Snapshot modes. Parameters displayed in

Snapshot mode are the same as those displayed in Data List mode with the addition of a time and index stamp showing where the data occurred relative to the Snapshot trigger.

There are two basic types of parameters: parameters that can be displayed in one, two or three different states

(e.g. On/Off, On/Off/Circuit Open), or analog parameters that represent quantities and are displayed as a value with appropriate units (Volts, Amps, MPH/KPH).

Following is a description of some parameters that can be displayed using the 1986 to present GM Chassis

Software. Included is:

• A description of the states.

• A description of the units, and the range of the analog parameters. Analog ranges are the widest possible ranges, not necessarily realistic maximum or minimum ranges.

• A description of the parameter.

NOTE

The parameters listed on the following pages do not include all of the Data

List parameters available in the Chassis Software.


Delco Moraine III & Delco VI ABS C. Data List Parameters

DELCO MORAINE III & DELCO VI ABS


(DELCO MORAINE III)

STATES

LOW/OK FOR OPERATION

Battery voltage is an input to the ABS controller that is used to determine if adequate voltage exists for proper operation. If battery voltage to the ABS controller drops below 9.7 volts when the vehicle is moving,

ABS will disable itself due to low voltage.

ABS BATT VOLTAGE (DELCO VI)

ABS IGN VOLTAGE (DELCO VI)

UNITS

VOLTS

RANGE

0.0 to 17.1

ABS Battery Voltage and ABS Ignition Voltage are analog input signals read by the EBCM. The EBCM uses ABS Ignition Voltage to detect ignition on or ignition off. ABS will be disabled by the EBCM if the battery voltage falls below or rises above programmed thresholds.


(DELCO MORAINE III & DELCO VI)

STATES

ON/OFF/FLASHING

The ABS warning light indicates to the driver the operational status of the Antilock Brake System. If the light is OFF, the system is fully operational. If the light is FLASHING, a fault has been detected by the

Antilock brake controller. This fault does not affect the operation of ABS at the current time, but must be repaired to avoid additional damage to the Antilock Brake System. If the light is ON, a fault has been detected by the Antilock brake controller that affects ABS operation. ABS will be completely disabled and all four wheels will operate with conventional base brakes (all wheels may lock).

BRAKE PRESSURE


STATES

LOW (<1800 PSI)

OK (>1800 PSI)

CIRCUIT OPEN

Brake pressure is an input to the Antilock brake controller that identifies the Powermaster III accumulator pressure. LOW pressure may not provide enough power assist to lock the brakes and may be an indication something is wrong with the brake system. OK pressure indicates sufficient brake pressure is available for base and Antilock braking. If the brake pressure circuit is OPEN, the brake pressure state is invalid and can not be used.

BRAKE SWITCH


STATES

ON/OFF

CIRCUIT OPEN

The brake switch is an input to the Antilock brake controller that identifies the state of the brake switch, which must be ON for the ABS to operate. If the brake switch circuit is OPEN, the brake switch state is invalid and cannot be used.



BRAKE T-TALE CMD

(DELCO VI)

STATES

ON/OFF

The ABS Brake Telltale on the Instrument Panel Cluster (IPC) can be commanded OFF or ON by the ABS controller. The tester can display which state the telltale lamp is being commanded.

BRAKE TELLTALE

(DELCO VI)

STATES

ON/OFF

CIRCUIT OPEN

The tester displays the status of the Brake Telltale lamp; ON, OFF, or CIRCUIT OPEN. If the ABS

Controller detects a fault that affects base brake operation, it will turn the Red Brake Tell tale along with the

Amber ABS Warning Lamp.

BRAKES AVAILABLE


STATES

ANTILOCK/

REAR ABS ONLY/

BASE BRAKES

This parameter indicates what type of braking the vehicle is capable of supporting. If everything is operating normally, ANTI-LOCK braking will be available. Under certain fault conditions, ABS braking will only be possible on the rear wheels and “REAR ABS ONLY” will be displayed. Other failure modes will result in the loss of all ABS capability and the message “BASE BRAKES” is displayed.

ENABLE RELAY CMD

(DELCO VI)

STATES

ON/OFF

This parameter indicates whether the Enable Relay is being commanded ON or OFF.



UNITS

MPH or KPH

RANGE

0 to 255

Front wheel speeds are displayed such that the LEFT FRONT WHEEL SPEED is on the left hand side and the RIGHT FRONT WHEEL SPEED is on the right hand side. The front wheel speeds are generated by the change in flux as a toothed ring passes in front of a variable reluctance sensor. A sinusoidal waveform results at a frequency proportional to speed.

FRT ENABLE RELAY


STATES

ON/OFF

The front enable relay provides battery power to the front solenoids for ABS operation. If this relay is OFF, front Antilock braking is not possible.



L FRONT SOLENOID

R FRONT SOLENOID

(DELCO VI)

STATES

ON/OFF

This parameter indicates the state of the left and right front solenoids. The display will show ON if the solenoid is being commanded ON by the ABS controller, or OFF if the solenoid is being commanded OFF.

LEFT FRONT EMB

RIGHT FRONT EMB

(DELCO VI J,N,L-CAR)

STATES

RELEASE/HOLD

This parameter indicates the controller’s commanded state of the left and right front Electromagnetic Brakes

(EMB). The EMB is used to hold the motor shaft until motor movement is required. The display will show

RELEASE if the EMB is commanded on, or HOLD if the EMB is commanded off.

LF HOLD SOLENOID

RF HOLD SOLENOID

REAR HOLD SOL


STATES

ON/OFF

The hold solenoid is used during Antilock braking to hold brake pressure at the pressure currently being applied to the hydraulic channel specified. The rear axle solenoid holds the brake pressure at both rear wheels since they are both on the same hydraulic channel.

LF HOLD SOL FDBK

RF HOLD SOL FDBK

REAR HOLD SOL FB


STATES

HIGH/LOW

The hold solenoid feedbacks are used to verify proper electrical operation of the solenoid identified. The feedback state represents the voltage the controller sees at the solenoid when the enable relays are on. If the solenoid is commanded on by the ABS controller, the feedback state should be LOW (ground). If the solenoid is commanded off, the feedback state should be HIGH (battery voltage). The feedback states are used to identify and isolate faults in the solenoid circuits. The feedback state may not always coincide exactly with the solenoid state due to delays within the ABS.

LF MOTOR COMMAND

RF MOTOR COMMAND

REAR MOTOR COMMAND

(DELCO VI)

UNITS

AMPS FWD

AMPS REV

RANGE

0 to 20

0 to 20

This parameter indicates the status of the left front, right front and rear motors. The tester will display

Forward if the motor is being commanded forward or Reverse if the motor is being commanded to operate in reverse.



LF MOTOR FEEDBACK

RF MOTOR FEEDBACK

REAR MOTOR FEEDBACK

(DELCO VI)

UNITS

AMPS

RANGE

0 to 20

This is the actual motor current measured by the ECU through each motor. When the motor is not moving, feedback current is the same as the command current. If the motor is moving, the feedback current will be less than the command current.

LF RELEASE SOL

RF RELEASE SOL

REAR RELEASE SOL


STATES

ON/OFF

The release solenoid is used with the hold solenoid during Antilock braking to release brake pressure from the hydraulic channel specified. The brake pressure in both rear wheels is released at the same time since they are both on the same hydraulic channel.

LF REL SOL FDBK

RF REL SOL FDBK

REAR REL SOL FB


STATES

HIGH/LOW

These release solenoid feedbacks are used to verify proper electrical operation of the solenoid identified.

The feedback state represents the voltage the controller sees at the solenoid when the enable relays are on. If the solenoid is commanded on by the ABS controller, the feedback state should be LOW (ground). If the solenoid is a commanded off, the feedback state should be HIGH (battery voltage). The feedback states are used to identify and isolate faults in the solenoid circuits. The feedback state may not always coincide exactly with the solenoid state due to delays within the ABS.

PUMP MOTOR


STATES

ON/OFF

CIRCUIT OPEN

The Powermaster III pump motor state is an input to the Antilock brake controller. The pump motor state identifies the current state of the Powermaster III pump motor. If the pump motor circuit is OPEN, the pump motor state is invalid and cannot be used.

REAR ENABLE RELAY


STATES

ON/OFF

The rear enable relay provides battery power to the rear solenoids for ABS operation. If this relay is OFF, no

Antilock braking will be available.


Bosch ABS C. Data List Parameters

REAR WHL SPEEDS


UNITS

MPH or KPH

RANGE

0 to 255

Rear wheel speeds are displayed such that the LEFT REAR WHEEL SPEED is on the left hand side and the

RIGHT REAR WHEEL SPEED is on the right hand side. The rear wheel speeds are generated by the change in flux as a toothed ring passes in front of a variable reluctance sensor. A sinusoidal waveform results at a frequency proportional to speed.

VEHICLE SPEED


UNITS

MPH or KPH

RANGE

0 to 255

Vehicle speed is an internal Antilock brake controller parameter. It is computed from all four (4) wheel speeds and may not be exactly the same as the vehicle speedometer reading. Abnormally high, low, or irregular speed indications are usually the result of defective wheel speed sensors or wiring.

BOSCH ABS

ABS FAILED

STATES

YES/NO

If the ABS has failed the tester will display YES.

ASR SWITCH STATE

STATES

ON/OFF

This parameter indicates the state of the ASR Switch.

AVERAGE REAR WHEEL

UNITS

MPH or KPH

RANGE

0 to 255

The average rear wheel speed is indicated in MPH and KPH.

BRAKE FLUID

STATES

LOW/OK

The tester displays the status of the brake fluid level.

BRAKE SWITCH

STATES

ON/OFF

The brake switch is an input to the Antilock brake controller that identifies the state of the brake switch, which must be ON for the ABS to operate.



ECU ID

NUMERIC VALUE

XXXXXXXX/X/X

The ECU ID provides information regarding the version of the Electronic Control Unit (ECU) used in the

Bosch ABS. This information might be used to determine if the correct version of ECU is installed in the vehicle. It might also be referenced in service bulletins.

ENGINE SPEED

UNITS

RPM

RANGE

0 to 9999

Engine speed is an ECM internal parameter. It is computed by timing pulses coming from either the distributor, a cam sensor, or the Ignition Module.

ENGINE TORQUE

UNITS

% Delivered

RANGE

0 to 100

This parameter indicates % engine torque delivered to drive wheels.


UNITS

MPH or KPH

RANGE

0 to 255


LF VALVE SOLENOID

RF VALVE SOLENOID

LR VALVE SOLENOID

RR VALVE SOLENOID

STATES

APPLY, HOLD, VENTING, RELEASE

The parameter indicates the state of the valve solenoid.

LATERAL ACCELERATION

UNITS

VOLTS g’s

RANGE

0.3 to 5.1

–1.28 to +1.27

The sensor output for centrifugal force (measured as the vehicle turns) is indicated in g’s and volts.

LOW BRAKE FLUID

STATES

YES/NO

The tester displays YES if the brake fluid level is low, or NO if the fluid level is OK.

PUMP MONITOR

STATES

ON/OFF

This parameter indicates the status of the Pump Monitor, either ON or OFF.



REAR AXLE SPEED

REAR WHL SPEEDS

UNITS

MPH or KPH

RANGE

0 to 255


RIGHT REAR WHEEL SPEED is on the right hand side. In some vehicles with Bosch ABS, a single sensor is used for the REAR AXLE SPEED instead of left and right wheel speed sensors. The rear wheel speeds are generated by the change in flux as a toothed ring passes in front of a variable reluctance sensor. A sinusoidal waveform results at a frequency proportional to speed.

SR1 (SPEED RANGE 1) CALIBRATED

UNITS

MPH

KPH

RANGE

19 to 40

31 to 65

STATES

YES/NO

The scantool indicates the tire pressure monitor system is calibrated and capable of detection in the applicable range. If the parameter states NO, the system is not calibrated and is not capable of detecting tire pressures in this speed range.


UNITS

MPH

KPH

RANGE

49 to 59

65 to 95

STATES

YES/NO



UNITS

MPH

KPH

RANGE

59 to 74

95 to 120

STATES

YES/NO



UNITS

MPH

KPH

STATES

YES/NO

RANGE

74.5 to 90

120 to 140




SR1 (SPEED RANGE 1) LOW TIRE

UNITS

MPH

KPH

STATES

YES/NO

RANGE

19 to 40

31 to 65

The scantool indicates the tire pressure monitor system detects a low tire pressure in the applicable range. If the parameter states NO, the system has not detected a low tire pressure in the applicable speed range.


UNITS

MPH

KPH

RANGE

49 to 59

65 to 95

STATES

YES/NO



UNITS

MPH

KPH

RANGE

59 to 74

95 to 120

STATES

YES/NO



UNITS

MPH

KPH

STATES

YES/NO

RANGE

74.5 to 90

120 to 140


TCC BRK APPLIED

STATES

YES/NO

This parameter indicates whether or not the TCC Brake is applied.

TCC/BLS FAULT

STATES

YES/NO

The TCC/BLS FAULT parameter indicates if a fault has been detected.

TCS ACTIVE

STATES

YES/NO

This parameter indicates whether or not the TCS is active.


Teves ABS C. Data List Parameters

TCS DISABLED

STATES

YES/NO

This parameter indicates whether or not the TCS has been disabled.

TCS FAILED

STATES

YES/NO

This parameter indicates whether or not the TCS has failed.

TCS PWM FAILED

STATES

YES/NO

This parameter indicates whether or not the TCS PWM has failed.

THROTTLE ANGLE

Certain ECMs compute Throttle angle as a function of TPS Voltage. 0% indicates a completely closed throttle while 100% is wide open.

VALVE RELAY

UNITS

VOLTS

RANGE

0 to 21.7

The output status of the valve relay is displayed in volts.

UNITS

%

RANGE

0 to 100

TEVES ABS

BRAKE SWITCH

STATES

ON/OFF

The brake switch is an input to the Antilock brake controller that identifies the state of the brake switch, which must be ON for the ABS to operate.


UNITS

MPH or KPH

RANGE

0 to 255


PEDAL TRAVEL

STATES

RELEASED/40% DOWN

This parameter indicates whether the brake pedal is being partially (or fully) depressed, or if it is released.


Kelsey-Hayes RWAL/4WAL ABS C. Data List Parameters

REAR WHL SPEEDS

UNITS

MPH or KPH

RANGE

0 to 255


RIGHT REAR WHEEL SPEED is on the right hand side. The rear wheel speeds are generated by the change in flux as a toothed ring passes in front of a variable reluctance sensor. A sinusoidal waveform results at a frequency proportional to speed. On the rear wheels, the sensor/ring assembly is contained within the rear integral wheel bearing assembly.

SERVICE PROTOCOL

This parameter defines the protocol used by the ABS controller and is reserved for future use.

SOFTWARE VERSION

This parameter displays the software version of the PROM that is installed in the Teves ABS controller.

KELSEY-HAYES RWAL/4WAL ABS

At present, only 4WAL and VCM RWAL ABS systems are capable of displaying data parameters. 1988-92

RWAL and 1993 ZP RWAL systems do not display data parameters.

ABS TELLTALE

(VCM RWAL)

STATES

ON/OFF

The ABS Telltale parameter indicates the status of the ABS Telltale lamp. If the parameter displays ON, but the Telltale is not on, there is a problem in the ABS Telltale lamp or circuit.

BRAKE ENABLE RELAY

(VCM RWAL)

STATES

ON/OFF

The Brake Enable Relay parameter displays the state of the brake relay. The system uses the relay to deactivate the antilock functions when a system malfunction occurs.

BRAKE SWITCH

(VCM RWAL)

STATES

ON/OFF

The Brake Switch parameter displays the state of the brake switch.

BRAKE TELLTALE

(VCM RWAL)

STATES

ON/OFF

The Brake Telltale parameter indicates the status of the brake telltale lamp. If the parameter displays ON, but the telltale is not on, there is a problem in the brake telltale lamp or circuit.


Kelsey-Hayes RWAL/4WAL ABS C. Data List Parameters

DRIVE STATUS

(4WAL)

STATES

2WD/4WD

The Drive Status parameter indicates whether 2WD or 4WD has been selected.

DUMP VALVE

(VCM RWAL)

STATES

ON/OFF

The Dump Valve parameter displays the state of the dump valve.

IGNITION 3

(VCM RWAL)

STATES

PRESENT/ABSENT

The Ignition 3 parameter displays PRESENT if ignition voltage is available for the brake system.

ISOLATION VALVE

(VCM RWAL)

STATES

ON/OFF

The Isolation Valve parameter displays the state of the isolation valve.

LF FRONT RESET

REAR RESET

RT FRONT RESET

(4WAL)

STATES

OPEN/CLOSED

These parameters display the state of the reset switches.

SOFT FAULTS

(4WAL)

STATES

YES/NO

The Soft Faults parameter displays YES if any Soft Fault Codes are available for display. This parameter is only available for vehicles with 4 wheel speed sensors. It is not available if the vehicle only has 3 wheel speed sensors.

TROUBLE CODES

(4WAL)

STATES

YES/NO

The Trouble Codes parameter displays YES if any RWAL trouble codes are stored in the ABS ECU.

VALVE RESET

(VCM RWAL)

STATES

OPEN/CLOSED

The Valve Reset parameter displays the state of the valve reset.


VES

VEHICLE SPEED

(VCM RWAL)

UNITS

MPH or KPH

The Vehicle Speed parameter displays the vehicle speed in MPH or in KPH.

C. Data List Parameters

RANGE

0 to 255

VES

FEEDBACK CURRENT

UNITS

mA

RANGE

0 to 833

The Feedback Current parameter displays the actual current at the VES Solenoid as measured by the CCM.

STEERING WHL SNR

UNITS

COUNTS

VOLTS

RANGE

0 to 255

0 to 5.1

The Steering Wheel Sensor Input parameter displays the position of the steering wheel, and is used to determine the desired amount of power steering assist.

VEHICLE SPEED

UNITS

MPH

RANGE

0 to 255

The Vehicle Speed parameter displays the vehicle speed in MPH.

RTD/EVO

BATTERY VOLTAGE SIGNAL

Battery voltage seen by the suspension control module.

COMPRESSOR SIGNAL (IF EQUIPPED)

The state of the compressor motor relay.

UNITS

VOLTS

STATES

ON/OFF

RANGE

10.0 to 16.0


RTD/EVO C. Data List Parameters

EVO ACTUAL CURRENT (IF EQUIPPED)

UNITS

AMPS

RANGE

0 to 1

The actual value attained for the EVO actuator.

EVO DESIRED CURRENT (IF EQUIPPED)

UNITS

AMPS

RANGE

0 to 1

The value the ECU is trying to achieve for the EVO actuator.

EVO DRIVE PWM (IF EQUIPPED)

UNITS

%

RANGE

0 to 100

The value of the EVO modulation as a percentage.

EXHAUST SIGNAL (IF EQUIPPED)

The state of the exhaust solenoid.

LIFT/DIVE STATUS

Information for the suspension control module from the PCM inputs, indicating hard acceleration or braking.

LEFT FRONT DAMPER ACTUATOR

RIGHT FRONT DAMPER ACTUATOR

LEFT REAR DAMPER ACTUATOR

RIGHT REAR DAMPER ACTUATOR

STATES

ON/OFF

The state of the shock absorber/damper solenoid.

REAR LEVELING AIR PRESSURE

(IF EQUIPPED)

STATES

ACTIVE/INACTIVE

UNITS

PSI

RANGE

-16 to 188

The pressure inside the rear leveling air system.

REAR LEVELING AIR PRESSURE

(IF EQUIPPED)

UNITS

VOLTS

RANGE

0.15 to 4.85

The value of the air pressure in the shock absorbers, in volts.

STATES

ON/OFF


RTD/EVO

RF POSITION SENSOR

LF POSITION SENSOR

RR POSITION SENSOR

LR POSITION SENSOR

UNITS

VOLTS

The measured value in volts of the vehicle height (body to wheel).

STEERING WHEEL POSITION SIGNAL 1

STEERING WHEEL POSITION SIGNAL 2

UNITS

VOLTS

The value in volts for position of the steering wheel.

STEERING WHEEL RATE

UNITS

RPM

The speed at which the steering wheel is being turned.

VEHICLE SPEED

The vehicle speed sent to the suspension control module from the PCM.

UNITS

KPH

(MPH)

C. Data List Parameters

RANGE

0.35 to 4.75

RANGE

0.35 to 4.75

RANGE

0 to 667

RANGE

0 to 193

(0 to 120)


D. GLOSSARY AND

ABBREVIATIONS

This appendix contains terms and abbreviations found in the General Motors body, chassis, and powertrain manuals.

1-4

14L

1ST

2AR

2FP

2IJ

2ND

2PT

32S

3RD

4TH

4WAL

ABS

A/C or AC

ACL

ACCEL

ACM

ACO

ACT

A/D

ADVICS

Skipshift

1-4 Shift Light

First Gear

Secondary Air Injection Reaction

Secondary Fuel Pump

Secondary Injector Module

Second Gear

Secondary Port Throttle

3-2 Solenoid

Third Gear

Fourth Gear

Four Wheel Anti-lock Brake System

Anti-lock Brake System

Air Conditioning

Low A/C Lamp

Accelerometer or Acceleration

Heater and A/C Programmer

AIR Control

Actual

Analog to Digital

Manufacturer of ABS systems

ASW

ASY

A/T

ATC

AUTO,

AUT

B+

AFECU

AIR

ALDL

ALS

ALT

AMB

Analog Data

Parameter

ANLG

ARMD

A/S

ASR

Alternate Fuel Engine Control Unit

Air Injection Reaction

Assembly line Diagnostic Link. In

1993 the name was changed to Data

Link Connector.

Ambient Light Sensor

Alternator

Ambient

A parameter which represents a quantity and is displayed as a value with appropriate units (volts, C, %, etc.).

Analog

Armed

AIR Solenoid

Acceleration Slip Regulation;

Automatic Stability Regulator

AIR Switch

AIR System

Automatic Transmission

Automatic Transfer Case

Automatic

Battery Voltage


D. Glossary and Abbreviations

CCM

CCP

CEL

CELL

CFI

CH1

CH2

BARO

BATT

BCM

BFC

BILVL

BKE

BKL

BLK

BLM

BPMW

BPW

BST

BYP

CAG

CAL,

CALIB

CAN

Capture

Data

CAR

CARB

CAT

CC, C/C

CCDCIC

BLT

Bosch ABS

Barometric Pressure

Battery

Body Control Module

Body Function Controller

Bilevel

Brake Enable Relay

Brake Light

Block

Block Learn Multiplier, Block Learn

Memory

Seatbelt T/T

Bosch’s ABS-2U system contained in some GM vehicles.

Brake Pressure Modulator Valve

Blower Pulse Width

Boost

Bypass

Check Gauge T/T

Calibration


Save information coming from the vehicle

Cold Advance Relay

California Air Resource Board

Catalytic

Cruise Control

Climate Control and Diagnostic

Information Center

Central Control Module

Climate Control Panel

Check Engine Light

Cellular, as in phone

Cross Fire Injection

Chime 1

Chime 2

CPI

CRTC

CRTM

CSFI

CSV

CTL,

CNTL,

CNTRL

CHG

CHK

CKT

Class 2

Oil Change T/T

Check

Circuit

GM communication protocol that defines diagnostic data messages and test modes within a vehicle multiplexed network.

Closed Loop Carburetor Control CLCC

CLF

CLM

CLSD

CMD

CMFI

CMP

Closed Loop Fuel

Column

Closed

Command

CNTRL

CNTRLR

CNTS or

CNTCS

Central Multi-port Fuel Injection

Camshaft Position

Control

Controller

Contacts

CNV Catalytic Converter

Control Test A test where the tester controls some the vehicle’s functions

COOL Coolant

CTS

CURR

CVRSS

CYCL

DAB

Central Port Injection

Cathode Ray Tube Controller

Cathode Ray Tube Monitor

Central Sequential Fuel Injection

Courtesy Relay

Control

Courtesy

Current

Constant Variable Road Sensing

System. Used on 1997 and 1998 E and K body.

Cycle

Delayed Accessory Bus Relay



DET

DETECTN

DF

DFI

DFOG

DFRST or

DF

Diagnostic

Codes

Data Line

Data List

Data Signal

Data

Parameter

DC

DCD

DCD ABS

III

DCD ABS

VI

DEC

DERM

Refers to circuit 800, the on-board computer communications network.

Tester operating mode where DLC diagnostic information is displayed.

A signal sent to or from a computer on a common wire with many other messages.

A parameter which represents a quantity and is displayed as a value with appropriate units (volts, C, %, etc).

Duty Cycle

Delco Chassis Division

Delco Chassis Division’s ABS III system

Delco Chassis Division’s ABS VI system

Decrease or decrement

Diagnostic Energy Reserve Module

(SIR System control module.

Supplies current through the inflator modules, which will cause deployment of the air bags in the event of a frontal crash of sufficient force up to 30 degrees off the center line of the vehicle).

Deterrent

Detection

Defrost

Digital Fuel Injection

Defog

Defrost

DIC

DIL

DIR

Discrete

Data

Parameter

Trouble codes. Set by a system to indicate the occurrence of abnormal conditions.

Driver Information Center

Delayed Interior Light relay

(activates courtesy lights)

Direction

A parameter which can be in one of only two possible states (HIGH/

LOW, ON/OFF, etc.)

EFE

EFI

EG1

EG2

EG3

EGR

EGV

Discrete

Signal

DIV

DLC

DLY

DOHC

DR

DRA

DRL

DSIR

DTC

DVM

E&C

E&C Bus

E&C

Component

EBCM

EBTCM

ECCP

ECM

ECU

EEPROM

An individual voltage or ground signal that is carried on its own wire.

Division, Divert

Data Link Connector

Delay

Double Overhead Cam

Door

Digital Ratio Adapter

Daytime Running Lamps

Desired

Diagnostic Trouble Code

Digital Volt Meter

Entertainment and Comfort

Entertainment and Comfort Bus. A communication link which interconnects components of the entertainment and comfort systems of the vehicle.

A component which performs an entertainment or comfort function and which is connected to the E&C

Bus.

Electronic Brake Control Module

Electronic Brake Traction Control

Module

Electronic Climate Control Panel

Engine Control Module or Electronic

Control Module

Electronic Control Unit

Electrically Erasable Programmable

Read Only Memory.

Early Fuel Evaporation

Electronic Fuel Injection

EGR Valve 1

EGR Valve 2

EGR Valve 3

Exhaust Gas Recirculation

EGR Vent Solenoid



ELC

ELEC

EMB

ENAB

Electronic Level Control

Electric

Electromagnetic Brake

Enable

ENG

EOLM

EPR

EPROM

Engine, English

Engine Oil Life Monitor

Exhaust Pressure Regulator

Erasable Programmable Read Only

Memory

Equalizer Equal

ESB

ESC

EST

Expansion Spring Brake

Electronic Spark Control

Electronic Spark Timing

ETS

EVO

EXH

F12

Electronic Traction Control System

Electronically Variable Orifice (an advanced GM steering system)

Exhaust

Fan 1 and 2

FDBK or FB Feedback

FDC Fuel Data Center

FET Field Effect Transmitter

FIX

FLD

FLR

Fixed

Field

Fog Lamps Relay

FN1

FN2

FNCTN

Fan 1

Fan 2

Function

FOG

FPR

FREQ

Rear Defog Relay

Fuel Pressure Regulator

Frequency

FRT, FRNT Front

FTD Functional Test Director (interactive test procedure)

FTR Fuel Trim Reset


FUP

FWD

FXS

GAG

GEN

GFD

GLT

GMP4

GOV

GRD

G/S

GVWR

HDL

HFN

H/L

HRN

HT

HVAC

Function

Keys

GND

Keys on the tester which can be used to select a particular function: ),

!

, (, etc. These keys double as numeric keys: 0-9.

Fuel Pump Control

Front Wheel Drive

Fixed Spark

Gauges Dimming

Generator 1 Terminal

General FET Driver

Governor Light

Microcomputer type used in High

Speed ECMs

Ground potential (low side of battery).

Governor

Ground

Grams per Second

Gross Vehicle Weight Ratio

Head Lamps Relay

High Fan

HI/LO Beams

Horn Relay

Heat

Heating, Ventilation and Air

Conditioning module.

HYDRL

IAC

ICCS

I.D. or ID

I/F

IGN

ILC

Hydraulic

Idle Air Control

Integrated Chassis Controller (used on Cadillac E/K bodies)

Identification

Interface

Ignition

Idle Load Compensator

INC Increase or Increment

INCANDES Incandescent

IND, INDIC Indicator

Page 357


LED

LEV

LF

LFN

L.INT

LMP

L.O2

LOC

LR

LST

LT or LITE

LTPWS

LV8

I/O

IPC

IRC

ISC

ITV

KAM

Key Tag

INFL

INGST

INIT

INJ

Intermittent

Testing

INT

KPa

KPH

LB6

L.BLM

LD2

Inflatable

Ingestion

Initialization

Injector

Testing which is performed to isolate problems that come and go.

Interior; Intake; Integrator

Input/Output

Instrument Panel Cluster

Integrated Radio Chassis

Idle Speed Control

Intake Tuning Valve

Keep Alive Memory

Keychain sized auditory signal generator to open doors and trunk on

C-Body cars with Level II RAC.

Kilopascals (a unit of pressure)

Kilometers per Hour

Engine designation for the 2.8L PFI engine used in GM10 vehicles.

Left Block Learn

Engine designation for the 2.3L PFI engine used in GM10 vehicles.

Light Emitting Diode

Level

Left Front

Low Fan

Left Fuel Integrator

Courtesy Lamp

Left Oxygen Sensor Voltage

Low Coolant Light

Left Rear

Loop Status

Light

Low Tire Pressure Warning System

Engine Load

MT

MTL

MTR mV

LVL

MAF

Oil Level T/T

Mass Air Flow

Magna Steer A speed dependent steering system that incorporates its controller into the EBCM/EBTCM. Magna Steer controls the amount of effort needed to provide a “road feel” using an electromagnet and rotor at the input of the steering gear. Magna Steer is speed dependent and uses inputs received from the ABS brake controller.

MANI

MAP

Manifold

Manifold Absolute Pressure;

Manifold Air Pressure

Manifold Air Temperature MAT

M/C

MD

MET

MFI

MIL

MIN

MIN-T

Mixture Control

Modulated Displacement

Metric

Multi-port Fuel Injection

Malfunction Indicator Lamp

Minimum

Chevrolet Minimum Function T-

Body car

Misc. Test

MON

MPH ms

MSG

MSM

MSVA

Miscellaneous Test

Monitor

Miles per Hour

Milliseconds (1000ths of a second)

Message

Memory Seat Module (1996 Cadillac models)

Magna Steer Vehicle Assist: an electronic steering control system that varies the power steering assist according to vehicle speed, otherwise knows as “Speed Dependent Steering

System”.

Manual Transmission

Min-T Lean

Min-T Rich

Millivolts (1000ths of a volt)



MXD

N/C

N/O

NRM

Numeric

Keys

O2

OAT

OBD

OBD II

O/D

ODO

On-Board

OHC

OLF

OLL

Parameter

PAS

PCM

PFI

PGM

PHN

PK2

PKEY

Mixed Door Maximum

Normally Closed

Normally Open

Normal keys (0, 1-9) which are used to enter numeric values such as trouble codes.

These keys double as function keys:

)

-

(

Oxygen or oxygen sensor

Outside Air Temperature Sensor

On Board Diagnostic

On-Board Diagnostics (Phase II). The

California Air Resource Board

(CARB) required that, by 1996, all vehicles sold in California (under

8500 GVWR) contain a certain minimum “on- board diagnostic” capability to diagnose emissionsrelated failures of the engine control system. These diagnostic requirements have been designated as

OBD II with a goal of monitoring “all of the emissions-related components on-board the vehicle for proper operation.”

Overdrive

Odometer

Anything which is a permanent part of the vehicle.

Overhead Cam

Oil Life

Oil Life Lamp

A piece of information which is displayed by the tester.

Pass-Key Telltale

Powertrain Control Module

Port Fuel Injection

Program

Cellular Mobile Phone

Pass Key 2 Starter Inhibit

Pass Key

QDM

RA

RAC

RAD

RAP

R.BLM

RCV,

RCVR

PROM

P/S

PSI

PUR

PWM

PWR

PZM

RECIRC

REF

REL

PKL

PM-III

P/N

POS

POT

Powermaste r III

Parking Lamps Relay

Powermaster III

Park/Neutral Switch

Position

Potentiometer. Variable resistor

Delco Moraine ABS III component.

Integral booster/modulator which provides both normal braking and anti-lock braking.

Pressure PRESS,

PSSR,

PRSSR

PRK

PRNDL

Park Gear

Transmission shifter (Park, Reverse,

Neutral, Drive and Low)

Programmable Read Only Memory

Power Steering; Prestroke

Pounds per Square Inch

Fuel Evaporator Purge

Pulse Width Modulation

Power

Platform Zone Module

Quad Driver Module

Rear Axle

Remote Accessory Control

Radio Dimming

Retained Accessory Power

Right Block Learn

Receive, Receiver

REQ

RES

RF

Recirculate

Reference

Relay; Release (when used with

“solenoid”)

Request

Resolution

Right Front



RFA

R.INT

RLY

R.O2

RR

RS232 or

RS-232

Secondary

Display

SEC

SECT

SEL

SENS

SES

SFI

RS232 IF

Cartridge

RSS

RST

RTD

RWAL

SAE

SAE J1850

VPW

S/C

SDL

SDM

Remote Function Actuator

Right Fuel Integrator

Relay

Right Oxygen Sensor

Right Rear

A serial data transmission standard between computers and accompanying systems which uses one signal line for data.

An auxiliary cartridge that works in conjunction with a vehicle cartridge.

The cartridge gives RS232 capability to the Tech 1 so it can communicate with computers and printers.

Road Sensing Suspension

Reset

Real Time Dampening

Rear Wheel Anti-lock Brake System

Society of Automotive Engineers

GM data link based on SAE J1850 variable pulse width class B medium speed communication network interface. 10.4kbps VPW, 0-7vDC.

Supercharged

Serial Data Link

Sensing and Diagnostic Module (part of the SIR system, the SDM contains a sensing device which converts vehicle velocity changes into an electrical signal. The electrical signal is processed by the SDM and compared to a value stored in memory).

Climate Control Head, Visual

Information Center

Security T/T; Secondary

Section

Selective Ride Control

Sensor

Service Engine Soon Light

Sequential Fuel Injection

TIM

TP

TPI

TPL

TPS

SYS

TAC

TBI

TCC

SPD

SPS

SRV

SSS

SHRT, SHT Short

SIR Supplemental Inflatable Restraint

(An active restraint system used to protect the automobile’s occupant from being forced into the dash and windshield upon impact in the event of an accident).

Snapshot

Test

SOL

Tester operating mode which is used to isolate intermittent problems.

Solenoid

Speedometer Dimming

Speed Signal

Service

Speed Sensitive Steering. Used on

1997 and 1998 E and K body.

Steering STR

SW

SWPS

Switch

Steering Wheel Position Sensor

System

Throttle Actuator Control

TCM

TCP

TCS

Throttle Body Injection

Torque Converter Clutch

Transmission Control Module

TCC PWM Solenoid

Traction Control System (for limiting slippage during acceleration)

TDP

TEMP

TEVES

THK

TICS

Twilight Delay Pot

Temperature

Teves Mark IV ABS system contained in some GM vehicles

Throttle Kicker

Timing and Ignition rate Control

System

Tire Inflation Module

Temperature

Tuned Port Injection

Twilight/Park Lamps

Throttle Position Sensor


UNLCK

V

VAC

VATS

VCC

VCM

VES

VF

TQUE

TRM

Trouble

Codes

TST

TT or T/T

UART

VFD

VIM

VIN

VNT

VOL

VS

VSS

WHL

WOT

WS or W/S

WSS

WST

ZP

Torque

Terminal

Same as Diagnostic Codes. Set by a system ECU to indicate the occurrence of abnormal conditions.

Test

Telltales; Telltale Lamp. Warning indicators on the instrument panel.

Universal Asynchronous Receiver

Transmitter

Unlock

Volts

Vacuum

Vehicle Anti-Theft System

Viscous Converter Clutch

Vehicle Control Module

Variable Effort Steering

Vacuum Fluorescent. Used in many of the displays.

Vacuum Fluorescent Dimming

Vehicle Interface Module. An in-line interface that expands tester functionality.

Vehicle Identification Number

Vent

Volume

Vacuum Solenoid

Vehicle Speed Sensor

Wheel

Wide Open Throttle

Windshield

Wheel Speed Sensor

Wastegate

Zero Pressure



Page 361

INDEX

A

ABS braking

ABS motor

ABS tests

202

7

306

ABS version adapters

80

218

,

244

ABS warning lamp

257

antilock brake system

331

323

anti-lock warning light

ASR test

140

auto bleed autobleed

177

,

206

,

326

303

automated bleed automated test

262

,

269

271

automatic test

135

,

151

,

173

B

bars on screen blank screen

333

332

bleed prep

248

Bosch 2U ABS

147

Bosch 5.0

Bosch ABS

169

brake lamp brake relay brake switch

131

293

293

292

C

cartridge missing chassis systems

2

333

check class 2 communication check connection

336

337

GM Chassis Application 1986-2004 cigarette lighter polarity

5

clear codes

146

,

164

clearing codes

114

,

200

286

,

288

to

289

clearing trouble codes code history

132

,

147

,

169

common test modes

111

condition-latched code

284

cycles without brake apply

216

D

damper test data capture

194

118

data list

111

,

132

,

data list parameters

147

,

169

,

194

Bosch ABS

344

Delco Moraine III

Delco VI ABS

340

340

Kelsey Hayes RWAL/4WAL ABS

Teves ABS

348

VES

351

data pairs

112

DBC 7 system self test

258

257

Delco ABS VI

219

Delco Moraine ABS III

196

Delco/Bosch 5.0

265

diagnostic trouble codes

113

discrete parameters display error

334

113

display locked drive cycle

338

197

,

220

DTC history

DTCs

196

,

220

,

277

,

303

113

,

194

dump valves

300

349

Index-362

duty cycle test

158

,

181

E

EBCM

EBTCM

147

169

electromagnetic brake (EMB)

(EBTCM)

169

232

electronic brake and traction control module electronic brake control module (EBCM) electronic level control (ELC)

168

,

185

147

,

244

,

323

electronic traction control system (ETS)

ETS warning lamp

258

258

F

fault isolation flash codes

199

144

,

162

function test

276

,

282

,

301

G

gear tension

255

H

hard (current) codes hydraulic control

284

208

,

230

,

250

I

ignition-latched code install Bosch adapter install cartridge

6

isolation valves

300

284

indicator lamp sequence information test mode

335

312

128

K

Kelsey Hayes systems keyboard locked keypad

107

338

279

L

lamp test

137

,

175

,

242

,

274

leak down check low trac lamp

258

214

M

Magna Steer

275

Magna Steer Variable Assist (MSVA) manual control manual relay

224

203

mass storage cartridge

75

modulator

227

motor rehome motor rehome test motor test

253

255

246

260

N

no communication no data received

336

334

O

OBD II hardware interface open/short circuit

336

82

P

parking brake pilot valve test

6

,

278

138

,

154

Powermaster III

196

precautions

5

pressure hold

189

,

260

,

267

pressure modulator valve (PMV) pressure release printing

119

problems

332

pump motor pump run total time

210

212

190

,

260

,

267

323

Q

quick keys

77

R

real time damping (RTD) relay test

238

,

255

remove cartridge reverse polarity

5

6

194

road sensing suspension (RSS)

RSS DTCs

165

RWAL connectors

279

165

,

183

S

segment check select mode

165

,

183

110

select system

110

selective ride control

144

GM Chassis Application 1986-2004 Index-363

smart cluster snapshot

6

,

257

117

snapshot mode

,

132

,

148

,

170

121

multiple data lists set-up phase

122

soft (history) codes software version

284

306

Software, before operating solenoid control

203

72

to

74

solenoid test solenoid tests

Stabilitrak

189

,

260

,

267

133

,

148

,

170

,

300

,

324

265

steering wheel position sensor (SWPS) system ID

255

187

T

tester induced DTCs

Teves Mark II

310

diagnostics

310

,

7

317

with ABS diagnostics

317

without ABS diagnostics

Teves Mark IV

323

Throttle position sensor learn throttle position sensor learn

310

142

179

tire inflation monitor system (TIM) tire size calibration traction control

265

277

traction control system (TCS)

259

traction control system test (TCS) traction off warning light

323

trigger

117

156

,

176

,

258

,

328

273

ABS stop any code automatic manual

118

118

117

117

single code soft fault

118

118

117

trigger condition trigger point

117

trim calibration trouble codes

277

132

,

147

,

169

,

199

,

286

,

288

to

289

troubleshooting

332

V

variable effort steering (VES) vehicle identification number vehicle speed signal (VSS)

295

160

,

181

108

296

vehicle speed signal (VSS) monitor voltage check

281

voltage load

255

voltage load test voltage spikes

6

240

W

warning lamps

219

GM Chassis Application 1986-2004 Index-364

Vetronix Tech 1, A, Mastertech MTS 3100 chassis application Manual

Assistant Bot

General Motors

Chassis Application

1986-2004

SOME THINGS YOU SHOULD KNOW

WARNING!

Exhaust Gas

WARNING!

Avoiding Injury

Important—Please Read

Disclaimer

FCC Compliance

Using This Application with the MTS 3100

A Note about Tech 1 and Tech 1A Testers

Important—Please Read

Using This Manual

Table of Contents

1. GM CHASSIS APPLICATION

DESCRIPTION

OPERATING MODES

DATA LIST

DTC(S)

SNAPSHOT

OBD CONTROLS

INFORMATION

GM ABS SYSTEMS

GM CHASSIS SYSTEMS

VARIABLE EFFORT STEERING SYSTEMS

EVO

MSVA

TRACTION CONTROL SYSTEMS

ASR, ETS and TCS

ELECTRONIC SUSPENSION

ELC, RSS, RTD, SEL, ICCS, AH

TIRE INFLATION MONITORING SYSTEM

TIM

TIRE PRESSURE MONITOR SYSTEM

TPM

VEHICLE STABILITY ENHANCEMENT SYSTEM

VSES

2. OPERATING PRECAUTIONS

INTRODUCTION

PRECAUTIONS FOR ALL APPLICATIONS

PROTECT AGAINST REVERSE POLARITY

CAUTION!

PROTECT AGAINST VOLTAGE SPIKES

CAUTION!

INSTALL/REMOVE CARTRIDGES WITH TESTER OFF

CAUTION!

APPLY PARKING BRAKE

WARNING!

OBD CONTROLS MODE OPERATION

PROTECT SNAPSHOT DATA

CAUTION!

PRECAUTIONS FOR GM CHASSIS APPLICATION

LOSE ABS BRAKING

CAUTION!

CHECK TESTER INDUCED DTCs

CAUTION!

3. VEHICLE COVERAGE

VEHICLE COVERAGE

1986 VEHICLE COVERAGE

1986 BUICK PASSENGER CARS

1986 CADILLAC PASSENGER CARS

1986 OLDSMOBILE PASSENGER CARS

1986 PONTIAC PASSENGER CARS

1987 VEHICLE COVERAGE

1987 BUICK PASSENGER CARS

1987 CADILLAC PASSENGER CARS

1987 OLDSMOBILE PASSENGER CARS

1987 PONTIAC PASSENGER CARS

1988 VEHICLE COVERAGE

1988 BUICK PASSENGER CARS

1988 CADILLAC PASSENGER CARS

1988 OLDSMOBILE PASSENGER CARS

1988 PONTIAC PASSENGER CARS

1988 LIGHT DUTY TRUCKS

1989 VEHICLE COVERAGE

1989 BUICK PASSENGER CARS