BENDIX | MC-30 TRAILER ABS CONTROLLER | Troubleshooting guide | BENDIX MC-30 TRAILER ABS CONTROLLER Troubleshooting guide

BENDIX MC-30 TRAILER ABS CONTROLLER Troubleshooting guide
SD-13-4815
Bendix® EC-30™ ABS / ATC Controller
Mounting
Inserts
18-pin
Connector
Part Number
Label
30-pin
Connector
FIGURE 1 - EC-30™ CONTROLLER
INTRODUCTION
The Bendix® EC-30™ is an electronic ABS (antilock braking
system) controller. It is the base component in a family of
ABS assemblies for heavy and medium duty buses, trucks
and tractors utilizing pneumatic braking systems.
The ABS function of the EC-30™ controller is designed to
optimize slip on all vehicle wheels. The EC-30™ controller
provides the vehicle with improved stability and steerability
during braking. The EC-30™ controller will also reduce
vehicle stopping distance on most surfaces.
In addition to the ABS function, the EC-30™ controller can
be configured to provide an ATC (automatic traction control)
feature. Bendix ATC can improve vehicle traction during
acceleration on adverse road conditions. ATC can utilize
engine torque limiting and/or differential braking to improve
vehicle traction.
LED Diagnostic
Display
TABLE OF CONTENTS . . . . . . . . . . . . . . . . . . . . . . PAGE
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
EC-30™ Controller Hardware Configurations . . . . . . . . . . 3
EC-30™ Controller With PLC. . . . . . . . . . . . . . . . . . . . . . . 3
EC-30™ Controller Inputs . . . . . . . . . . . . . . . . . . . . . . . . . 4
EC-30™ Controller Outputs . . . . . . . . . . . . . . . . . . . . . . . . 4
Power-Up Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
ABS Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
ATC Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Auto-Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
EC-30™ Controller Configurable Parameters . . . . . . . . . . 8
EC-30™ Controller Self-Configuration . . . . . . . . . . . . . . . . 8
Fault Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
ABS Partial Shutdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
EC-30™ Controller Diagnostic Display . . . . . . . . . . . . . . . 9
Blink Code Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Bendix DCI Diagnostic Tool . . . . . . . . . . . . . . . . . . . . . . 14
Bendix ABS Diagnostic Software . . . . . . . . . . . . . . . . . . 15
NEXIQ (MPSI) Bendix Cartridge. . . . . . . . . . . . . . . . . . . 15
Contacting Bendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Safe Maintenance Practices . . . . . . . . . . . . . . . . . . . . . . 15
Removing the EC-30™ Controller Assembly . . . . . . . . . 16
Installing a New EC-30™ Controller. . . . . . . . . . . . . . . . . 16
ABS and ATC Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1
EC-30™
Controller
ABS / ATC
Assembly
ATC
Modulator
(integral)
ATC
Modulator
Connector
ATR VALVE
FIGURE 2 - EC-30™ CONTROLLER WITH ATR VALVE
COMPONENTS
The EC-30™ controller ABS function utilizes the following
components:
-
Wheel speed sensors (4 or 6, depending on
configuration)
-
Electro-pneumatic ABS modulator valves (4)
-
Dash mounted tractor ABS warning lamp (relay
controlled)
-
Service brake relay valve
-
Dash mounted trailer ABS warning lamp (towing
vehicles manufactured after March 1, 2001)
-
Blink code activation switch (optional)
™
The EC-30 controller ATC function utilizes the following
additional components:
-
ATC modulator - Integral to the ATR (antilock/traction
relay) valve assembly
-
Dash mounted ATC active/warning lamp
-
Serial communication to engine control module
(interfaces with throttle input and engine torque)
-
ATC enable/disable switch
ENCLOSURE
The EC-30™ controller electronics are contained in a nonmetallic housing and are environmentally protected by a
hard epoxy potting compound. The design of the EC-30™
controller electronics is robust against radio, electromagnetic and environmental interference.
A patented LED (light emitting diode) diagnostic display
and magnetic reset switch are incorporated in the housing
for simple, self-contained diagnostics.
™
The EC-30 controller utilizes a 30-pin and an 18-pin wire
harness to interface with ABS, ATC and vehicle system
components.
2
EC-30™ Controller Comparison to EC-16™ and
EC-17™ Controllers
The EC-30™ controller has been designed to replace the
EC-17™ and the EC-16™ controllers as the standard Bendix
ABS controller for OEM and aftermarket installations. The
EC-30™ controller has a black plastic enclosure similar to
the EC-17™ controller. However, the EC-30™ controller
utilizes plastic mounting inserts to reduce mounting bolt
corrosion, where the EC-17™ controller utilizes metal
mounting inserts. The EC-16™ controller utilizes a totally
metal enclosure.
The EC-30 ™ controller ABS warning lamp power-up
sequence has been simplified compared to the EC-17™
and EC-16™ controllers.
The EC-30™ controller ABS warning lamp, at power-up without
faults, will illuminate for 2.5 seconds and then turn off.
The ABS warning lamp for EC-17™ and EC-16™ controllers,
at power-up without faults, will illuminate for approximately
8 seconds and flash twice before turning off.
ECU
Model
Enclosure
ABS Warning Lamp
Power-Up Sequence
EC-30™
Controller
EC-17™
Controller
EC-16™
Controller
Plastic with Plastic
Mounting Inserts
Plastic with Metal
Mounting Inserts
Metal Enclosure
2.5 seconds on, then off
8 seconds on, two
flashes, then off
8 seconds on, two
flashes, then off
CHART 1 - ECU DIFFERENCES (EC-30™, EC-17™, EC-16™
CONTROLLERS)
MOUNTING
ECU Only
The EC-30™ controller can be bracket mounted to the vehicle
cab or chassis as a stand alone ECU. See figure 1.
Valve Mounted EC-30™ Controller
The EC-30™ controller can be assembled on one of four
different valve models. The controller valve assembly is
then mounted in place of the standard service brake relay
valve on the vehicle. An assembly model designation
is assigned when the EC-30™ controller is mounted on
an AR (antilock relay) valve or an ATR (antilock/traction
relay) valve. See figure 2. Some models include bobtail
proportioning and/or ATC functions. See chart 2.
EC-30™
Controller/Valve
Assembly
Models
ABS / ATR
Valve
CR-30
CR-30BP
AR-1™ Valve
AR-2™ Valve
AT-30
AT-30BP
ATR-1™ Valve
ATR-2™ Valve
Added
Function
Provided
Vehicle
Application
None
Bobtail Brake
Proportioning
ATC
ATC & Bobtail
Brake Proportioning
All
Tractors
Only
All
Tractors
Only
CHART 2 - EC-30™ CONTROLLER / VALVE ASSEMBLIES
EC-30™ CONTROLLER HARDWARE
CONFIGURATIONS
Measuring / Identifying the PLC Signal
An oscilloscope can be used to verify the presence of a PLC
signal on the power line. The PLC signal is an amplitude
and frequency modulated signal. Depending on the filtering
and load on the power line, the PLC signal amplitude can
range from 5.0 mVp-p to 7.0 Vp-p. Suggested oscilloscope
settings are (AC coupling, 1 volt/div, 100 µsec/div). The
signal should be measured at the power leads of the
EC-30™ controller. See figures 3 & 4.
™
The EC-30 controller ABS ECU is available in different
hardware configurations in order to support various ABS,
ATC and power line carrier (PLC) features. See chart 3.
EC-30 ™ controller premium PLC hardware can be
configured for four or six sensors, with or without ATC, and
PLC can be disabled.
EC-30™ controller basic models can not be configured for
six sensors or ATC.
The EC-30™ controller will not broadcast PLC messages
unless it is specially programmed to do so. With this
standard configuration, an ABS trailer equipped with PLC or
a PLC diagnostic tool will need to be attached to the vehicle
in order to generate a PLC signal on the power line.
PLC hardware is needed to support PLC communication.
Always verify that you are working with the correct EC-30™
controller by referring to the part number label on the ECU.
EC-30™ CONTROLLER WITH PLC
Effective March 1, 2001, all towing vehicles must control
an in-cab trailer ABS warning lamp. Trailers built after this
date will transmit the status of the trailer ABS unit over the
power line (blue wire of the J560 connector) to the tractor
using PLC communications.
The PLC signal is usually broadcasted by the trailer ABS
ECU. The application of PLC technology for the heavy vehicle
industry is known as PLC4Trucks. The Bendix® EC-30™
controller premium with PLC, and basic with PLC, will support
PLC communication in accordance with SAE J2497.
Identifying an EC-30™ Controller with PLC
FIGURE 3 - POWER LINE WITHOUT PLC SIGNAL
An EC-30™ controller with or without PLC can be identified
by the individual part number label on the ECU. Also, an
EC-30™ controller may have one of the following labels
applied:
White Label:
ECU does not support an in-cab
Trailer ABS warning lamp.
Orange Label:
FIGURE 4 - POWER LINE WITH PLC SIGNAL
ECU supports IN-CAB
Trailer ABS warning lamp.
Diagnostics
EC-30 Hardware
Sensors
Configurations
Basic
4
Premium
4, 6
Basic PLC
4
Premium PLC
4, 6
EC-17/EC-16 Service
4, 6
Replacement
ATC
X
X
X
J1587
J1939
X
X
X
X
X
X
X
X
X
X
1
Blink
Codes
X
X
X
X
X
Engine
Communication
J1922
J1939
X
X
X
X
X
X
PLC
Trailer
ABS WL1
X
X
X
X
Required for all towing vehicles built after March 1, 2001.
™
CHART 3 - EC-30 CONTROLLER HARDWARE CONFIGURATIONS
3
EC-30™ CONTROLLER INPUTS
Blink Code Switch
Power and Ground
The EC-30™ controller can be configured to support an
optional diagnostic blink code switch to ground, which can
be used to activate several functions available through
blink code diagnostics. Pin F3, of the 30-pin connector, is
the blink code switch input.
Power is supplied to the EC-30™ controller from the ignition
circuit through a 30 Amp fuse. The EC-30™ controller is
grounded to the vehicle chassis. For EC-30™ controller
power and ground connector pin locations, see EC-30™
controller system schematic, Figure 14.
Wheel Speed Sensors
Wheel speed data is provided to the EC-30™ controller from
the Bendix® WS-20™ or WS-24™ wheel speed sensors.
See figure 5 for wheel speed sensor illustrations. Working
with an exciter ring, wheel speed sensors provide the
EC-30™ controller with an AC signal, which varies in voltage
and frequency in relation to the speed of the wheel. The
EC-30™ controller can be configured to receive wheel
speed information from 100 or 86 tooth exciter rings.
Vehicle axle configurations and ATC features determine
the number of speed sensors that must be used. A vehicle
with a single rear drive axle (4x2, 4x4 or 6x2) requires four
speed sensors for both ABS and ATC operation. A vehicle
with two rear drive axles (6x4) can utilize six speed sensors
for optimal ABS and ATC performance. For wheel speed
sensor connector pin locations, see the EC-30™ controller
system schematic, Figure 14.
Three Position Switch for ATC and Blink Codes
The EC-30™ controller can be configured to receive both
the ATC enable/disable signal and the blink code activation
signal from a single three-position switch. In this case, the
common position of the switch is connected to pin F2 of
the 30-pin connector. The normally-open switch position
is connected to +12 VDC to disable ATC. The normallyopen (momentary) switch position is connected to ground
to activate blink codes. When configured in this manner,
there is no wire installed in pin F3 of the 30-pin connector,
which is normally used for the blink code switch input.
Brake Switch Input
The EC-30™ controller can be configured to support an
optional brake switch input. The brake switch input can be
used in accordance with ABS and ATC performance. Pin
A2, of the 18-pin connector, is the brake switch input.
EC-30™ CONTROLLER OUTPUTS
WS-24™
Sensor
ABS Modulators
Straight Speed
Sensors
WS-20™
Sensor
90° Speed
Sensors
WS-24™
Sensor
WS-20™
Sensor
FIGURE 5 - BENDIX® WS-20™ AND WS-24™ WHEEL SPEED
SENSORS
ATC Enable/Disable Switch
Premium EC-30™ controller models, configured for ATC,
monitor an ATC enable/disable switch to +12 VDC, which
allows ATC to be manually deactivated. The ATC active/
warning lamp will be on while the ATC is disabled. Pin F2,
of the 30-pin connector is the ATC enable/disable switch
input.
Bendix ® ABS modulators (M-21 ™, M-22 ™, M-30 ™ or
M-32™) are controlled by the EC-30™ controller to modify
driver applied air pressure to the service brakes during
ABS or ATC activation. See figure 6 for illustration. The
ABS modulator, an electro-pneumatic control valve, is the
last valve that air passes through on its way to the brake
chamber. The modulator hold and exhaust solenoids are
activated to precisely modify the brake pressure during
ABS. The hold solenoid is normally open and the exhaust
solenoid is normally closed. The EC-30™ controller is
able to control four individual modulator assemblies. For
ABS modulator connector pin locations see the EC-30™
controller system schematic, figure 13.
M-30™
Modulator
Supply
(Port 1)
Delivery
(Port 2)
J1939 - ATC Enable/Disable Switch
The EC-30™ controller can be configured to receive the
status of the ATC enable/disable switch over the SAE J1939
serial communications link. A vehicle controller will monitor
the position of the ATC enable/disable switch directly, and
broadcast a J1939 message indicating its status. When
configured in this manner, there will be no wire installed in
pin F2 of the 30-pin ECU connector. In the event that J1939
communications is lost between the EC-30™ controller and
the vehicle controller, the EC-30™ controller will disable the
ATC function.
4
Exhaust
(Port 3)
Electrical
Connector
M-32QR™
Modulator
M-32™
Modulator
FIGURE 6 - M-30™, M-32™, AND M-32QR™ MODULATORS
Trailer ABS Warning Lamp
ATC Modulator
Premium EC-30 controller models configured for
differential braking ATC will activate the ATC modulator
during ATC situations. The ATC modulator is an electrically
controlled air valve integral to the ATR valve. Pins D2 and
D3, of the 18-pin connector, control the ATC modulator. A
connection to the ATC modulator is provided via a two-pin
Deutsch connector from the ATR valve. See figure 2.
EC-30™ controller models with PLC can be configured to
control a trailer ABS warning lamp (located in the dash) that
indicates the status of the trailer ABS unit of one or more
trailers or dollies. The EC-30™ controller directly controls
the trailer ABS warning lamp by providing a ground path
when the lamp is to be activated. Pin E2, of the 30-pin
connector, is the trailer ABS warning lamp output.
ABS Warning Lamp
J1939/J1587 Trailer ABS Warning Lamp
The EC-30™ controller controls an ABS warning lamp
to indicate the ABS unit status. The EC-30™ controller
provides a ground signal to activate an ABS warning lamp
relay and turn the ABS lamp off. The actual ABS warning
lamp is connected to the normally-closed contacts of the
relay in order to illuminate in a fail-safe manner during an
ABS ECU failure. Pin E3, of the 30-pin connector, is the
ABS warning lamp output.
The EC-30™ controller can be configured to broadcast
the trailer ABS status over the SAE J1939 or the SAE
J1587 serial communications links. In this case, a vehicle
controller will directly operate the trailer ABS warning
lamp. When configured in this manner, there is no wire
installed in pin E2 of the 30-pin connector. In the event that
communications is lost between the EC-30™ controller and
the vehicle controller, the dash controller will activate the
trailer ABS warning lamp.
™
J1939 ABS Warning Lamp
The EC-30™ controller can be configured to broadcast the
ABS status over the SAE J1939 serial communications
link. A vehicle dash controller directly controls the ABS
warning lamp. When configured in this manner, there is no
wire installed in pin E3 of the 30-pin connector. If J1939
communications is lost between the EC-30™ controller and
the vehicle dash controller, the dash controller will activate
the ABS warning lamp.
Retarder Disable Relay
The EC-30™ controller controls an engine or transmission
retarder disable relay. The retarder activation wire is routed
through the normally-closed contacts of the relay. The
EC-30™ controller provides a ground path to activate
the relay and interrupt power to the retarder during ABS
operation. This output may also connect directly to a
transmission ECU. Pin K1, of the 30-pin connector, is the
retarder disable relay output.
J1939/J1922 Retarder Disable
The EC-30™ controller can be configured to interrupt the
engine or transmission retarder over the SAE J1939 serial
communications link. (J1922 for some service replacement
models). The retarder will be disabled during ABS via the
serial communications. When configured in this manner,
there is no wire installed in pin K1 of the 30-pin connector.
Use of the retarder disable function via the serial link may be
essential to ABS performance and is highly recommended
for vehicles equipped with a capable retarder.
J1939/J1922 Torque Converter Lock Disable
The EC-30™ controller can be configured to interrupt the
automatic transmission torque converter lock function,
over the SAE J1939 serial communications link. (J1922
for some service replacement models). The converter lock
will be disabled during ABS via the serial communications.
Use of the torque converter lock disable function may be
essential to ABS performance and is highly recommended
for vehicles equipped with a capable transmission.
J1708/J1587 Diagnostic Link (J1939)
The EC-30™ controller provides a J1708/J1587 diagnostic
link to communicate with the vehicle and various diagnostic
tools. Diagnostics, system configuration, data uploading
and downloading and other functions can be performed
using this link. The EC-30™ controller is supported by tools
such as Bendix® ABS Diagnostic Software, the Bendix®
DCI hand held tool and the MPSI ProLink. The EC-30™
controller may also provide diagnostics using the SAE
J1939 serial communications link.
J1939/1922 Engine Torque Reduction - ATC
The EC-30™ controller can be configured to reduce engine
torque over the SAE J1939 (J1922 for some service
replacement models) serial communications link. The
EC-30™ controller will send a J1939 message to reduce
engine torque during ATC operation.
ATC Active/Warning Lamp
Premium EC-30™ controller models configured for ATC can
control an ATC active/warning lamp to indicate the status of
the ATC system. The ATC active/warning lamp flashes when
ATC is active and stays on if an ATC system fault is detected
or ATC is disabled by the ATC enable/disable switch. The
EC-30™ controller directly controls the ATC active/warning
lamp by providing a ground path when the lamp is to be
activated. Pin C2, of the 30-pin connector, is the ATC
active/warning lamp output.
J1939 ATC Active/Warning Lamp
Premium EC-30™ controller models configured for ATC can
be configured to broadcast the status of the ATC active/
warning lamp over the SAE J1939 serial communications
link. In this case a vehicle dash controller directly operates
the ATC active/warning lamp. When configured in this
manner, there is no wire installed in pin C2 of the 30-pin
connector. In the event that J1939 communications are
lost between the EC-30™ controller and the vehicle dash
controller, the dash controller will activate the ATC active/
warning lamp.
5
POWER-UP SEQUENCE
ABS Warning Lamp at Power-Up
At power-up without detected faults, the ABS warning lamp
turns on for 2.5 seconds and then turns off. See figure 7.
Diagnostic LEDs at Power-Up
At power-up, the diagnostic LEDs all turn on, then display
the configuration for sensors and the ATC. After showing
the configuration, only the green VLT LED will stay on.
However, if a fault is detected, the faulted component will
be identified by the red LEDs. See chart 4.
ATC Active / Warning Lamp at Power-Up
At power-up, the ATC active/warning lamp displays the
ATC control configuration and then turns off. A series of
blinks indicates if the ATC is configured for engine torque
limiting and differential braking, engine torque limiting only,
or differential braking only. See figure 7.
1st
LED Power-Up Sequence
LEDs
When power is applied
All LEDs Illuminate
Then the LEDs indicate one of the following:
2nd
4 Sensors
6 Sensors
SEN-RER-FRT
SEN-RER-MID-FRT
Then the LEDs indicate one of the following:
3rd
ATC Engine Limiting
ATC Differential Braking
No ATC
TRC
TRC-MOD
N/A
The LEDs will then indicate system status:
Powered Vehicle ABS WL
Trailer ABS WL
(PLC Detected)
ON
4th
OFF
CHART 4 - LED POWER-UP DISPLAY OF EC-30™
CONTROLLER CONFIGURATION
Normal Operation (if no faults)
VLT
ON
OFF
Trailer ABS WL ON
(PLC Not Detected) OFF
Retarder Disable Relay at Power-Up
At power-up, the EC-30™ controller may toggle the retarder
disable relay. If the relay is located in the cab it is usually
audible to the operator.
Modulator Chuff Test at Power-Up
Engine torque ON
limiting and OFF
differential braking
Engine torque
limiting only
ON
OFF
Differential braking only ON
OFF
No ATC
ON
OFF
FIGURE 7 - EC-30™ CONTROLLER POWER-UP LAMP
SEQUENCE
At power-up, the EC-30™ controller activates a patented
modulator chuff test. The modulator chuff test is an
electrical and pneumatic ABS modulator test, that can
assist the technician in verifying proper modulator wiring
and installation. With brake pressure applied, a properly
installed modulator causes a single sharp audible chuff
of air pressure by activating the hold solenoid two times
and the exhaust solenoid once. If the modulator is wired
incorrectly, the modulator will produce a double chuff, or
no chuff at all. The EC-30™ controller activates a chuff at
each modulator in the following sequence:
Right-Front, Left-Front, Right-Rear, Left-Rear. See figure 8.
The chuff sequence is then repeated for a total of 8 chuffs. If
an issue is detected during the modulator chuff test, look for
faults and compare the modulator wiring and plumbing to the
EC-30™ controller system schematic shown in figure 13.
Right Front
Right Mid
Right Rear
Left Mid
Left Rear
Trailer ABS Warning Lamp
At power-up, the trailer ABS warning lamp turns on for 2.5
seconds and then turns off. This only occurs if a PLC trailer
or PLC diagnostic tool is connected to the tractor at the
time ignition power is applied. Only an EC-30™ controller
with PLC installed on a towing vehicle will support the
trailer ABS lamp.
Driver
Left Front
FIGURE 8 - VEHICLE ORIENTATION
6
ABS OPERATION
Bendix ABS uses wheel speed sensors, ABS modulators
and an ECU to control either four or six wheels. By
monitoring the wheel slip during braking, and adjusting
the brake pressure at each wheel, the EC-30™ controller
is able to optimize slip between the tire and the road
surface. When excessive wheel slip is detected, the
EC-30™ controller will activate ABS. The EC-30™ controller
controls the ABS modulators to simulate a driver pumping
the brakes. However, the EC-30™ controller is able to pump
each brake on the vehicle independently, and with greater
speed and accuracy than a driver.
Front Axle Control
During ATC activation, the EC-30™ controller will blink the
ATC active/warning lamp to advise the driver that drivewheel spin is occurring. When ATC is no longer active, the
ATC active/warning lamp turns off.
Engine Torque Limiting ATC
The engine torque limiting feature allows the EC-30™
controller to reduce engine torque to a suitable level, in
relation to the amount of available traction. When the
engine torque is controlled, wheel slip can be optimized,
producing more traction between the wheel and road
surface. Engine torque limiting is especially beneficial in
avoidance of a power jackknife and when all drive wheels
are on an equally slippery surface. The EC-30™ controller
will verify that the driver is pressing the accelerator (using
J1939 or J1922) prior to initiating an ATC event.
Although both steering-axle wheels are controlled by
individual ABS modulators, the EC-30™ controller does
not control them completely independently. The EC-30™
controller uses a Modified Individual Regulation (MIR)
philosophy which blends the applied braking force between
the two steering axle brakes. MIR is used to minimize
steering wheel pull while ABS is active on an uneven road
surface (e.g. ice and asphalt).
In order for the engine torque limiting ATC feature to be
used, the vehicle must be equipped with an electronically
controlled engine and throttle. When configured for
engine torque limiting ATC, the EC-30™ controller must be
connected to an electronic engine via the SAE J1939 or
J1922 serial communications links.
Single Rear Axle Control
Differential Braking ATC
On vehicles with a single rear axle (4x2), the rear axle
wheels are controlled independently. Therefore, brake
application pressure at each wheel is adjusted according
to the wheel behavior on the road surface.
Differential braking ATC allows the EC-30™ controller
to gradually apply the brake on a spinning drive wheel.
Since the vehicle’s differential tends to drive the wheel
that presents the least resistance (the wheel on the most
slippery surface), a slight brake application to this wheel
forces the differential to drive the wheel on the opposite
side. The EC-30™ controller applies brake pressure to both
rear-axle ABS modulators by energizing the ATC modulator.
The EC-30™ controller can then apply pressure only to the
spinning wheel by controlling the ABS modulators.
Dual Rear Axle Control
For vehicles with dual rear axles (6x2 or 6x4), one ABS
modulator controls both right wheels and the other
modulator controls both left wheels. Both wheels on each
side receive equal brake pressure during an ABS stop. In
the case of only four wheel speed sensors, the two rear
sensors are located on the lighter rear axle.
Normal Braking
Differential braking ATC can be activated only when vehicle
speed is under 25 mph and one drive wheel is spinning
faster than the others.
During normal braking, brake pressure is delivered through
the ABS modulator and into the brake actuator. If the wheel
speed sensors do not detect an excessive slip, the EC-30™
controller does not activate ABS control and the vehicle
stops with normal braking.
In the event that differential braking, ATC is active for an
excessive time period, the EC-30™ controller will disable
ATC to prevent overheating and fading of brakes. The
EC-30™ controller will re-enable ATC after a short period
of time. The ATC active/warning lamp will be on while the
ATC is disabled.
ATC OPERATION
In order for the differential braking control to be used, the
vehicle must be equipped with an antilock/traction relay
(ATR) valve (ATR-1 or ATR-2). The vehicle also must have
an electronically controlled engine throttle.
Just as ABS improves vehicle stability during braking,
ATC improves vehicle stability and traction during vehicle
acceleration. By adding an ATC modulator and/or engine
communication, the EC-30™ controller ATC function uses
the same wheel speed information and modulator control
as the ABS function. The EC-30 ™ controller detects
excessive drive wheel speed, compares the speed of the
front, non-driven, wheels, and reacts to bring the wheel spin
under control. The EC-30™ controller can be configured
to use engine torque limiting and/or differential braking to
control wheel spin. For optimal ATC performance, both
methods are recommended.
ATC Enable/Disable Switch
The ATC enable/disable switch allows the operator to
enable or disable the ATC feature as necessary. ATC can
be disabled while the vehicle is stationary or in motion.
However, ATC will not re-enable until the vehicle comes
to a complete stop, even with the switch in the enable
position. The ATC active/warning lamp will be on while the
ATC is disabled.
7
AUTO-CALIBRATION
Auto-calibration is a feature that allows the EC-30 ™
controller to compensate for tire size changes throughout
the life of the vehicle. Auto-calibration is needed for proper
ATC performance. The EC-30™ controller will perform an
auto-calibration when the tire size difference exceeds
approximately 4 percent.
Tire size (rolling radius) setting information can be retrieved
or adjusted by using Bendix ABS Diagnostics Software or
MPSI.
If issues occur with the ATC function following a tire size
change, contact Bendix or refer to your local authorized
Bendix dealer.
EC-30™ CONTROLLER CONFIGURABLE
PARAMETERS
The EC-30™ controller has various configurable function
parameters that can be enabled to provide the user with
additional or customized features. The default settings
for these parameters are chosen by the vehicle OEM.
The configurable features include serial communications
message broadcasts, alternative lamp control, various I/O
recognition, ABS control settings and others. To ensure
that the unit you are working with has the correct default
settings, use only the correct replacement part number.
However, most of these settings can be altered using the
Bendix ABS Diagnostic Software program. For further
information, contact Bendix or refer to your local authorized
Bendix dealer.
In order to self-configure for differential braking ATC, the
ATC modulator must also be connected to the EC-30™
controller and be operational.
Some EC-30™ controller part numbers will not support six
wheel speed sensors or ATC. To ensure that the EC-30™
controller you are working with has the correct hardware
capability, use only the correct replacement part number.
EC-30™ Controller Self-Configuration Procedure
Verify that all ECU, communication, sensor, ABS modulator
and ATC modulator connectors are in place and then turn
the ignition power on. Toggle the ATC enable/disable
switch, if equipped.
Activate an EC-30™ controller self-configuration by one of
the following actions:
-
Hold a magnet on the reset location of the diagnostic
display for about 20 seconds (until the LEDs begin to
rapidly roll), then remove the magnet.
-
Press the DCI reset switch for about 20 seconds (until
the LEDs begin to rapidly roll), then release the switch.
-
Use the self-configuration menu selection on Bendix
ABS Diagnostic Software or the MPSI tool.
When the self-configuration process is complete, the
EC-30™ controller will automatically go through the powerup sequence and show the new configuration on the
diagnostic display. If the EC-30™ controller was properly
configured for ATC, the ATC active/warning lamp will also
show the ATC configuration. Refer to the EC-30™ controller
Power-Up Sequence section.
EC-30™ CONTROLLER SELF-CONFIGURATION
FAULT DETECTION
The self-configuration feature allows wheel speed sensor
and ATC configurations to be altered when activated with
a magnet or diagnostic tool. This is generally performed
shortly after installing or replacing an EC-30™ controller.
The EC-30™ controller contains self-testing diagnostic
circuitry that continuously checks for proper operation of the
ABS/ATC components and wiring. The EC-30™ controller
controls dash mounted warning lamps to advise the driver
of the status of the system.
Self-Configuration of Wheel Speed Sensors
When the EC-30™ controller senses an erroneous system
condition, it stores the fault code in memory, activates the
appropriate warning lamp and disables all or part of the effected
ABS or ATC functions. The faulted component is also identified
on the diagnostic display on the EC-30™ controller.
The number of speed sensors connected to the EC-30™
controller will be detected during the self-configuration
process. The EC-30™ controller will configure for six
sensors if it detects one or both Mid sensors. If only one Mid
sensor is detected, the ABS warning lamp and appropriate
diagnostic LEDs will illuminate following the self-configure.
If no Mid sensors are detected, the EC-30™ controller will
configure for four sensors.
Self-Configuration of ATC
In order to self-configure for engine torque limiting ATC,
the following must be connected to the EC-30™ controller
and be operational:
-
J1939 or J1922 communication link to the engine
-
ATC active/warning lamp
-
ATC enable/disable switch (must be toggled prior to
self-configuration)
8
In most cases, the EC-30™ controller will automatically reset
(self-heal) the active fault code when the fault is corrected.
However, repeated occurrences of a given fault will cause the
fault code to latch. Once the fault code is latched, a manual reset
is required. Latching of faults can assist in the troubleshooting
of intermittent faults. The fault code is stored in the EC-30™
controller memory, even when power is removed.
After repair, latched fault codes can be reset by briefly
holding a magnet on the reset location of the EC-30™
controller diagnostic display. Fault codes can also be reset
with the blink code switch or with a diagnostic tool.
When a fault self-heals or is manually reset, the fault code
remains in fault history. Fault history can be retrieved by
using blink code diagnostics or a diagnostic tool.
ABS PARTIAL SHUTDOWN
Reading a Fault
Depending which component the fault is detected on, the
ABS and ATC functions may be fully or partially disabled.
Even with the ABS warning lamp on, the EC-30™ controller
may still provide ABS function on wheels that are not
affected by the fault. The EC-30™ controller should be
serviced as soon as possible.
When a fault is detected, the EC-30™ controller identifies
the faulted component with the diagnostic LEDs. When
a wheel speed sensor fault, or an ABS modulator fault is
detected, the SEN or MOD LED will be accompanied by two
location LEDs. An example is FRT-RHT-SEN. When these
three LEDs are on, this is an indication of a fault on the front
axle(FRT), right side(RHT), wheel speed sensor(SEN).
For a complete explanation and troubleshooting of faults
displayed by the LEDs, go to section F, Troubleshooting.
Front ABS Modulator Fault
ABS on the affected wheel is disabled. ABS and ATC on
all other wheels remains active.
Rear ABS Modulator Fault
ATC is disabled. ABS on the affected wheel is disabled.
ABS on all other wheels remains active.
Front Wheel Speed Sensor Fault
The faulted wheel is still controlled by using input from
the remaining wheel speed sensor on the front axle. ABS
remains active on the rear wheels. ATC is disabled.
Mid or Rear Wheel Speed Sensor Fault
ATC is disabled. In a four sensor system, ABS on the
affected wheel is disabled, but ABS on all other wheels
remains active.
In a six sensor system, ABS remains active by using input
from the remaining rear wheel speed sensor on the same
side.
ATC Modulator Fault
The red diagnostic LEDs only indicate active system faults.
When a fault self-heals or is manually reset, the fault code
remains in fault history. Fault history can be retrieved by
using blink code diagnostics or a diagnostic tool.
If faults occur on multiple components, the diagnostic
LEDs will display one fault at a time. When the first fault is
repaired and the EC-30™ controller is reset, the next fault
will be displayed on the LEDs.
Fault Reset
After the fault is corrected, the active fault code and LEDs
can be reset by briefly holding a magnet in place at the
RESET location of the diagnostic display. All of the LEDs
will be on while the magnet is held in place. If one or more
LEDs do not go on when the magnet is in place, replace the
EC-30™ controller. When the magnet is removed from the
reset location, only the green VLT diagnostic LED should
remain on. If red LEDs are still on, active faults are still
present in the system.
Note: An EC-30™ controller self-configuration will occur if
a magnet is held at the reset location for greater than 20
seconds.
ATC is disabled. ABS remains active.
J1939/J1922 Communication Fault
ATC is disabled. ABS remains active.
ECU Fault
ABS and ATC are disabled. The system reverts to normal
braking.
Voltage Fault
Front Axle
Mid Axle
Magnetic
Reset Switch
Rear Axle
While voltage is out of range, ABS and ATC are disabled.
The system reverts to normal braking. When the correct
voltage level is restored, full ABS and ATC function is
available. Operating voltage range is 9.0 to 16.0 VDC.
EC-30™ CONTROLLER DIAGNOSTIC DISPLAY
The EC-30™ controller diagnostic display consists of nine
red fault LEDs, one green power LED and an internal,
magnetic reset switch. See figure 9 for illustration.
Right Side
Left Side
ATC
Modulator
Sensor
™
No tools are needed to read the EC-30 controller
diagnostic display. A fault displayed on the LEDs will always
be accompanied by the illumination of the ABS warning
lamp and/or the ATC active/warning lamp.
ECU
Voltage
FIGURE 9 - EC-30™ CONTROLLER LED DIAGNOSTIC
DISPLAY
9
BLINK CODE DIAGNOSTICS
™
The EC-30 controller provides diagnostic and configuration
functions using blink code diagnostics. When the blink code
mode is activated, the EC-30™ controller flashes the ABS
warning lamp to communicate active fault codes, fault code
history or, ABS and ATC configurations. The blink code
diagnostics mode can also be used to reset active fault
codes. See chart 5.
The ABS warning lamp illuminates while the blink code
switch is pressed. The lamp turns off when the blink code
switch is released. The blink code switch is optional and
may not be installed on some vehicles (pin F3 of the 30pin connector).
Following a single display of all available messages, the
ABS warning lamp remains on for five seconds and then
returns to the normal operating mode. Fault occurrence
count information is not displayed with blink code
diagnostics.
If wheel speeds are detected during the blink code
diagnostics mode, the EC-30™ controller exits the blink
code diagnostics and returns to the normal operating mode.
The blink code diagnostics mode can only be activated
following a power-up, where wheel speeds have not been
detected.
Press the Blink
Code Switch
1 time
2 times
3 times
4 times
To display history fault codes, press the blink code switch
two times. Following activation, there will be a three second
delay, followed by a blink code display of all history fault
codes. See chart 7 for fault code definitions.
Reset Active Fault Codes
To reset active fault codes, press the blink code switch three
times. Following activation, there will be a three second
delay, followed by a blink code message of:
1-1, (System Fully Operational - No Faults Detected)
or
A blink code display of all active fault codes.
The ABS warning lamp will stay on if active faults are still
present. See chart 7 for fault code definitions.
Resetting active fault codes with blink code diagnostics
does not clear information from the fault history. Fault
history can be retrieved by using blink code diagnostics
or a diagnostic tool.
Display EC-30™ Controller Configuration
To check the ECU configuration, press the blink code
switch four times. Following activation, there will be a
three second delay, followed by a blink code display of the
EC-30™ controller configuration. See chart 6.
Blink Code Action
Display Active Fault Codes
Display Fault Code History
Reset Active Fault Codes
Display EC-30 Configuration
CHART 5 - BLINK CODE ACTIVATION
Display Active Fault Codes
To display active fault codes, press the blink code switch
one time. Following activation, there will be a three second
delay, followed by a blink code display of all active fault
codes. See chart 7 for fault code definitions.
10
Display Fault Code History
1st Digit
Sensors
2
3
4 Sensors
6 Sensors
2nd Digit
Modulators
2
4 Modulators
3rd Digit
ATC
2
3
4
5
Not ATC
ATC Engine Torque Limiting Only
ATC Differential Brake Only
Full ATC (Engine Torque Limiting
and Differential Braking)
CHART 6 - BLINK CODES FOR EC-30™ CONTROLLER
CONFIGURATION
CHART 7 - EC-30™ CONTROLLER BLINK CODE DEFINITIONS (1 of 3)
11
Sensor output low or missing during vehicle operation above 10 mph. Verify
condition of tone ring mounting. Adjust speed sensor to contact tone ring.
Rotate wheel and verify: (a) for WS-20 speed sensor that output is minimally
0.8 VAC @ 1 RPS or (b) for WS-24 speed sensor that output is minimally
0.250 VAC @ 0.5 RPS. Verify condition and retention force of sensor clips.
Verify proper sensor lead routing and clamping.
Sensor output intermittent or excessive wobble in exciter ring. Verify condition
of tone ring mounting and teeth. Verify proper adjustment of wheel bearings.
Adjust speed sensor to contact tone ring. Rotate wheel and verify: (a) for
WS-20 speed sensor that output is minimally 0.8 VAC @ 1 RPS or (b) for
WS-24 speed sensor that output is minimally 0.250 VAC @ 0.5 RPS. Verify
condition and retention force of sensor clips. Verify proper sensor lead
routing and clamping.
Adjust speed sensor to contact tone ring. Verify proper number of tone ring
teeth per sensed wheel. Rotate wheel and verify: (a) for WS-20 speed sensor
that output is minimally 0.8 VAC @ 1 RPS or (b) for WS-24 speed sensor that
output is minimally 0.250 VAC @ 0.5 RPS. Verify condition and retention
force of sensor clips. Verify proper sensor lead routing and clamping. Verify
condition of tone ring mounting and teeth.
CHART 7 - EC-30™ CONTROLLER BLINK CODE DEFINITIONS (2 of 3)
12
Check for corroded or damaged modulator wiring and connections. Verify for M-21, M-22, or M-30
that resistance between pins: Hold to Common is 3.5 to 5.0 Ohms, Exhaust to Common is 3.5
to 5.0 Ohms, Exhaust to Hold is 7.0 to 10 Ohms. For M-32 and M-32QR, Verify that resistance
between pins: Hold to Common is 4.9 to 5.5 Ohms, Exhaust to Common is 4.9 to 5.5 Ohms,
Exhaust to Hold is 9.8 to 11 Ohms. Verify no continuity from modulator leads to ground.
Check for corroded or damaged modulator wiring and connections. Verify for M-21, M-22, or M-30
that resistance between pins: Hold to Common is 3.5 to 5.0 Ohms, Exhaust to Common is 3.5
to 5.0 Ohms, Exhaust to Hold is 7.0 to 10 Ohms. For M-32 and M-32QR, Verify that resistance
between pins: Hold to Common is 4.9 to 5.5 Ohms, Exhaust to Common is 4.9 to 5.5 Ohms,
Exhaust to Hold is 9.8 to 11 Ohms. Verify no continuity from modulator leads to ground.
Check for corroded or damaged modulator wiring and connections. Verify for M-21, M-22, or M-30
that resistance between pins: Hold to Common is 3.5 to 5.0 Ohms, Exhaust to Common is 3.5
to 5.0 Ohms, Exhaust to Hold is 7.0 to 10 Ohms. For M-32 and M-32QR, Verify that resistance
between pins: Hold to Common is 4.9 to 5.5 Ohms, Exhaust to Common is 4.9 to 5.5 Ohms,
Exhaust to Hold is 9.8 to 11 Ohms. Verify no continuity from modulator leads to ground.
Check for corroded or damaged modulator wiring and connections. Verify for M-21, M-22, or M-30
that resistance between pins: Hold to Common is 3.5 to 5.0 Ohms, Exhaust to Common is 3.5
to 5.0 Ohms, Exhaust to Hold is 7.0 to 10 Ohms. For M-32 and M-32QR, Verify that resistance
between pins: Hold to Common is 4.9 to 5.5 Ohms, Exhaust to Common is 4.9 to 5.5 Ohms,
Exhaust to Hold is 9.8 to 11 Ohms. Verify no continuity from modulator leads to ground.
Check for corroded or damaged modulator wiring and connections. Verify for M-21, M-22, or M-30
that resistance between pins: Hold to Common is 3.5 to 5.0 Ohms, Exhaust to Common is 3.5
to 5.0 Ohms, Exhaust to Hold is 7.0 to 10 Ohms. For M-32 and M-32QR, Verify that resistance
between pins: Hold to Common is 4.9 to 5.5 Ohms, Exhaust to Common is 4.9 to 5.5 Ohms,
Exhaust to Hold is 9.8 to 11 Ohms. Verify no continuity from modulator leads to ground.
CHART 7 - EC-30™ CONTROLLER BLINK CODE DEFINITIONS (3 of 3)
13
BENDIX DCI DIAGNOSTIC TOOL
Reading a Fault with DCI
The Bendix Diagnostic Communication Interface (DCI) is a
hand held diagnostic tool that was designed for use with the
Bendix® EC-17™ controller system and can also be used as
a stand alone diagnostic tool for the EC-30™ controller. See
figure 10 for illustration. The Bendix DCI has the same 10
diagnostic LEDs as the EC-30™ controller. A reset button
on the DCI duplicates the function of the magnetic reset
on the EC-30™ controller. There are also two DCI status
indicators to indicate power and active communication to
the DCI.
When a fault is detected, the DCI identifies the faulted
component with the diagnostic LEDs. When a wheel speed
sensor fault, or an ABS modulator fault, is detected, the
SEN or MOD LEDs will be accompanied by two location
LEDs. An example is FRT-RHT-SEN. When these three
LEDs are on, this is an indication of a fault on the front
axle(FRT), right side(RHT), wheel speed sensor(SEN).
For a complete explanation of faults displayed by the DCI
LEDs, see section F, Troubleshooting.
To perform diagnostics using the Bendix DCI, plug the DCI
into the vehicle’s J1587 diagnostic link connector. This
connector is generally located on the lower, driver-side
portion of the vehicle dash or under the dash panel. See
figure 11 for connector location.
Note: The DCI is not RP-1210 compliant and can not be
used as the communication link to any diagnostic software
intended for use with the EC-30™ controller. An RP-1210
compliant communication link from the computer to the
vehicle diagnostic connector will be needed.
For further information on the Bendix DCI, or RP-1210
compliant tools, contact Bendix or refer to your local
authorized Bendix dealer.
The DCI will only indicate active system faults. When a fault
self-heals or is manually reset, the fault code remains in
fault history. Fault history can be retrieved by using blink
code diagnostics or a capable diagnostic tool.
If faults occur on multiple components, the DCI will display
one fault at a time. When the first fault is fixed and the
EC-30™ controller is reset, the next fault will be displayed
on the DCI.
A fault displayed on the DCI will always be accompanied
by the illumination of the ABS warning lamp and/or the ATC
active/warning lamp.
Fault Reset with DCI
After the fault is corrected, the active fault code and LEDs
can be reset by briefly pressing the reset button on the DCI.
All of the DCI diagnostic LEDs will be on while the reset
button is pressed. When the reset button is released, only
the green VLT diagnostic LED should be on. If red LEDs
remain on, active faults are still present in the system.
The EC-30™ controller self-configuration will occur when
the reset button is pressed for greater than 20 seconds.
Located on
Dash Panel
Or
FIGURE 10 - BENDIX DCI - DIAGNOSTIC
COMMUNICATIONS INTERFACE
Located Under
Dash Panel
FIGURE 11 - VEHICLE DIAGNOSTIC CONNECTOR
LOCATION (J1708/J1587, J1939)
14
BENDIX ABS DIAGNOSTIC SOFTWARE
Bendix ABS Diagnostic Software is a RP-1210 compliant
PC-based program that provides technicians with the
highest level of diagnostic information and control of the
EC-30™ controller. See figure 12. It can also be used
to diagnose the EC-15™, EC-16™, EC-17™ and MC-30™
controllers (Trailer) ABS units. With Bendix ABS Diagnostic
Software, the technician can perform the following:
the field. Technician and date information must be entered
prior to the fleet scratchpad being updated. Some earlier
revisions of the EC-30™ controller do not support the read/
write function.
For more information on the Bendix ABS Diagnostic
Software program, or RP-1210 compliant tools, contact
Bendix or refer to your local authorized Bendix dealer.
- Full ABS / ATC diagnostics
NEXIQ (MPSI) BENDIX CARTRIDGE
- Configuration (ABS, ATC, and more)
NEXIQ provides a Bendix cartridge for use with the
Pro-Link tool. It can also be used to diagnose the EC-15™,
EC-16™, EC-17™ and MC-30™ controller (Trailer) ABS
units. See figure 13. For more information on the Bendix
diagnostic cartridge from NEXIQ, contact Bendix or refer
to your local authorized Bendix dealer. For information on
the PLC diagnostic tool, see SD-13-4834.
- Transfer data
- Perform system and component tests
- Update EC-30™ controller software versions (new features)
- Save and print information
When diagnosing the EC-30™ controller using a personal
computer and the Bendix ABS Diagnostic Software, the
computer’s serial or parallel port can be connected to the
vehicle’s diagnostic connector (J1708/J1587 or J1939)
through an RP-1210 compliant communication link.
READ/WRITE (SCRATCHPAD) FUNCTION
Using the Bendix ABS diagnostic software, OEM and fleet
service records can be permanently stored in the EC-30™
controller. Data contained in the OEM scratchpad area is
protected by a special password and can not be revised in
Lap Top
Computer
CONTACTING BENDIX
Bendix.com
The Bendix on-line troubleshooting guide for the
EC-30™ controller will help you determine the cause of
any conditions that may be preventing 100% performance
of your braking system. For additional troubleshooting
information on the EC-30™ controller, please refer to our
literature request section.
The Bendix on-line contacts guide will make it easy for you to
find the Bendix contacts you need. From this page, you can
navigate to technical support contacts, service engineers,
Bendix account managers, international contacts and more.
Bendix.com is your complete Bendix resource.
Bendix Technical Assistance Team
Parallel or
Serial Cable
For direct personal technical support, call the Bendix
technical assistance team at 1-800-AIR-BRAKE (1-800-2472725), Monday through Friday, 8:00 A.M. to 6:00 P.M. EST,
and follow the instructions in the recorded message.
Or, you may e-mail the Bendix technical assistance team
at: tbs.techteam@bendix.com.
J1708/J1587
or J1939
PDM (RP-1210)
FIGURE 12 - BENDIX ABS DIAGNOSTIC SOFTWARE
Pro-Link
Heavy Duty
Multi Protocol
Cartridge
PC Card MPSI
Part Number
801013
FIGURE 13 - NEXIQ (MPSI) PRO-LINK TOOL
15
SAFE MAINTENANCE PRACTICES
WARNING! PLEASE READ AND FOLLOW
THESE INSTRUCTIONS TO AVOID PERSONAL
INJURY OR DEATH:
When working on or around a vehicle, the following
general precautions should be observed at all times:
1. Park the vehicle on a level surface, apply the
parking brakes, and always block the wheels.
Always wear safety glasses.
2. Stop the engine and remove ignition key when
working under or around the vehicle. When
working in the engine compartment, the engine
should be shut off and the ignition key should be
removed. Where circumstances require that the
engine be in operation, EXTREME CAUTION should
be used to prevent personal injury resulting from
contact with moving, rotating, leaking, heated or
electrically charged components.
3. Do not attempt to install, remove, disassemble
or assemble a component until you have read
and thoroughly understand the recommended
procedures. Use only the proper tools and observe
all precautions pertaining to use of those tools.
4. If the work is being performed on the vehicle’s
air brake system, or any auxiliary pressurized air
systems, make certain to drain the air pressure
from all reservoirs before beginning ANY work
on the vehicle. If the vehicle is equipped with an
AD-IS® air dryer system or a dryer reservoir module,
be sure to drain the purge reservoir.
5. Following the vehicle manufacturer’s recommended
procedures, deactivate the electrical system in a
manner that safely removes all electrical power
from the vehicle.
6. Never exceed manufacturer’s recommended
pressures.
7. Never connect or disconnect a hose or line
containing pressure; it may whip. Never remove
a component or plug unless you are certain all
system pressure has been depleted.
8. Use only genuine Bendix® replacement parts,
components and kits. Replacement hardware,
tubing, hose, fittings, etc. must be of equivalent
size, type and strength as original equipment and
be designed specifically for such applications and
systems.
9. Components with stripped threads or damaged
parts should be replaced rather than repaired. Do
not attempt repairs requiring machining or welding
unless specifically stated and approved by the
vehicle and component manufacturer.
10. Prior to returning the vehicle to service, make
certain all components and systems are restored
to their proper operating condition.
16
11. For vehicles with Antilock Traction Control (ATC),
the ATC function must be disabled (ATC indicator
lamp should be ON) prior to performing any vehicle
maintenance where one or more wheels on a drive
axle are lifted off the ground and moving.
REMOVING THE EC-30™ CONTROLLER
ASSEMBLY
1. Turn vehicle ignition off.
2. Remove as much contamination as possible prior to
disconnecting air lines and electrical connections.
3. Note the EC-30™ controller assembly mounting position
on the vehicle.
4. Disconnect the electrical connectors from the EC-30™
controller.
5. Remove the four, hex head bolts that secure the
EC-30™ controller.
6. If the EC-30™ controller is mounted on a valve assembly,
it may be necessary to remove all air lines connected
to the unit. Remove the EC-30™ controller assembly
from the vehicle by removing the mounting bracket or
valve.
7. The original mounting hardware can be reused for
installation if it is in good condition. If replacement bolts
are needed, grade 5 bolts or stronger are required.
INSTALLING A NEW EC-30™ CONTROLLER
CAUTION! When replacing the EC-30™ controller, verify
that the unit you are installing has the correct default
settings. Failure to do so could result in a loss of features,
such as ATC and PLC, or noncompliance with U.S.
regulations such as FMVSS 121. It is recommended to use
only the correct replacement part number. However, most
configuration settings can be altered using the Bendix ABS
Diagnostic Software program.
Verify correct operation of the EC-30™ controller system
and warning lamps prior to putting the vehicle back into
service. Towing vehicles manufactured after March 1,
2001 must support the trailer ABS warning lamp located
on the dash.
For further information, contact either the vehicle
manufacturer, Bendix or your local authorized Bendix
dealer.
ABS Component
Connector
Wire
Terminal
Wire Seal/
Plug
Terminal
Lock
Terminal
Crimp Tool
EC-30™ Controller
Harness
12034398
12103881
(18-16 GA)
Plug
12065266
N/A
12094429
30-pin Packard
Metri-Pack
150 Series
EC-30™ Controller
Harness
12040921
N/A
12155975
18-pin Packard
Metri-Pack
150 Series
ABS Modulator
Harness
12040977
12077411
(18-16 GA)
12015323
(18-16 GA)
12034145
3-Pin Packard
Metri-Pack
280 Series
Wheel Speed
Sensor
15300014
15300027
2-Pin Packard
Metri-Pack
280 Series
Wheel Speed
Sensor
15300002
12048159
(18-16 GA)
DT04-2P
0460-215-16141
(14-16 GA)
0460-202-16141
(16-18 GA)
N/A
DT06-2S
0462-209-16141
(14-16 GA)
0462-201-16141
(16-18 GA)
N/A
W2S
DTM06-2S-E007
462-201-20141
(16-18 GA)
N/A
WM-2S
DTM04-2P
460-202-20141
(16-18 GA)
N/A
WM-2P
2-Pin Packard
Metri-Pack
280 Series
ATC Modulator or
Wheel Speed
Sensor
2-Pin Deutsch
DT Series
ATC Modulator
Harness or
Wheel Speed
Sensor
W2P
HDT-48-00
2-Pin Deutsch
DT Series
Wheel Speed
Sensor or ATC
Modulator
2-Pin Deutsch
DTM Series
Wheel Speed
Sensor
2-Pin Deutsch
DTM Series
CHART 8 - EC-30™ CONTROLLER COMPONENT CONNECTORS
17
FIGURE 13 - EC-30™ CONTROLLER SYSTEM SCHEMATIC
18
1. Position and secure the EC-30™ controller in the original
mounting orientation using the four hex head bolts.
Torque the hex head EC-30™ controller mounting
bolts to 98 in. Ibs. Over-tightening the ECU bolts
can cause damage to the EC-30™ controller.
2. For a valve-mounted EC-30™ controller, position and
secure the EC-30™ controller assembly to the vehicle,
in the original mounting orientation. Reconnect all air
lines to the EC-30™ controller assembly. All air lines and
fittings should be checked for leaks prior to returning
the vehicle to service.
3. Reconnect the electrical connectors to the EC-30™
controller and torque the connector retaining jackscrews to 15-20 in. lbs. Over-tightening the ECU
connector jack-screw(s) can cause damage to the
EC-30™ controller.
4. Apply power and monitor the EC-30™ controller powerup sequence to verify proper system operation.
3. Do not pierce wire insulation when checking for
continuity.
4. Do not deform individual pins or sockets during probing
with a volt/ohm meter.
5. Only use the correct crimping tool when replacing wire
terminals and connectors.
6. Properly resecure all wiring harness and sensor leads
when repairs are made.
TROUBLESHOOTING
Fault information can be retrieved from the EC-30 ™
controller by using the diagnostic LED display, blink code
diagnostics or a diagnostic tool. However, the technician
must confirm whether the fault resides in the component,
wiring or connectors. The following troubleshooting flow
charts will assist the technician in isolating the cause of
the fault.
5. When necessary, it is possible to road test the ABS
function by making an abrupt stop from a vehicle speed
of about 20 mph to check for proper function. The
wheels should not enter a prolonged lock condition and
ABS function should be audible. It is the responsibility of
the technician to perform the tests in a safe location.
Troubleshooting should always begin by observing the
ABS warning lamp and the ATC active/warning lamp
during the EC-30™ controller power-up sequence.
6. When necessary, it is possible to road test the ATC
function by accelerating on a road surface with
reduced traction. The drive wheels should not sustain
substantial spin. Audible bursts of air or engine throttledown should be noticed. It is the responsibility of the
technician to perform the tests in a safe location.
Once the circuit fault is found, isolate the area needing
repair by repeating the measurements at all connections
in the affected circuit (modulator, wheel speed sensor,
etc.).
ABS AND ATC WIRING
When repairs are made, reconnect the electrical connectors
to the EC-30™ controller and torque the connector
retaining jack-screws to 15-20 in. lbs. Over-tightening
the ECU connector jack-screw(s) can cause damage
to the EC-30™ controller.
The vehicle manufacturer designs and supplies the
vehicle harnesses for the EC-30™ controller. However,
Bendix specifies all component connectors. See chart 8
for components. The wiring harness and connectors are
weather resistant and sealed at the connector interface.
The wire gauge and insulation type used in the wire
harnesses is specific to the circuit function, but 16 gauge
GXL is most common. Refer to BW-106-A, Bendix ABS
Application Guideline, for specific wire harness application
information.
When troubleshooting ABS wiring, some general rules
should be followed where applicable.
1. Check all wiring and connectors to ensure they
are secure and free from visible damage. Check
for evidence of wire chafing due to poor routing or
poor securing of wires. Check connectors for proper
insertion and locking. Verify that the connector leads
are properly greased with a nonconductive electrical
grease compound and do not show signs of corrosion
or exposure to the environment.
If it is necessary to make electrical measurements, always
begin by taking voltage and resistance measurements at
the 30-pin and 18-pin wire harness connectors.
No voltage or resistance measurements are to be made on
the bulkhead connector pins of the EC-30™ controller.
Troubleshooting Flowcharts
Section A - Power-up sequence - ABS warning lamp and
ATC active/warning lamp
Section B - Power-up sequence - Trailer ABS warning lamp
Section C - ABS warning lamp
Section D - ATC active/warning lamp
Section E - Trailer ABS warning lamp
Section F - Diagnostic LED quick reference
Section G - Power to the EC-30™ controller
Section H - Wheel speed sensors
Section I - ABS modulators
Section J - ATC modulator
Section K - Serial communication
2. During wiring repair, a splice must be properly soldered
and made waterproof.
19
SECTION A - EC-30™ CONTROLLER POWER-UP SEQUENCE ABS WARNING LAMP AND ATC ACTIVE/WARNING LAMP
Turn ignition on and observe the ABS
warning lamp.
ABS Warning Lamp at Power-Up
ABS warning lamp
does not come on.
Go to Section C.
NO
The ABS warning lamp should
immediately illuminate when ignition
power is applied to the vehicle.
YES
The ABS warning lamp
stays on.
Go to Section F.
Verify that the ABS warning lamp stays
on for 2.5 seconds and then turns off.
NO
YES
The ABS unit is
functioning normally.
No service to ABS
components is needed.
Verify that the ATC enable/disable
switch is set to enable ATC. Turn
ignition on and observe ATC active/
warning lamp.
ATC Active/Warning Lamp at
Power-Up
ATC active/warning
lamp does not come on.
Go to Section D.
The ATC active/warning lamp should
immediately illuminate when ignition
NO power is applied to the vehicle.
YES
The ATC active/warning
lamp stays on.
Go to Section F.
NO
Verify that the ATC active/warning
lamp turns off after 2.5 seconds. This
lamp may blink, displaying the ATC
configuration during power up. See
figure 7.
YES
The ATC unit is functioning
n o r m a l l y. N o s e r v i c e
to ATC components is
needed.
20
SECTION B - EC-30™ CONTROLLER POWER-UP SEQUENCE TRAILER ABS WARNING LAMP
Verify that a PLC trailer is connected to
the tractor via the seven pin connector.
Turn ignition on and observe the trailer
ABS warning lamp.
Trailer ABS Warning Lamp at
Power-Up
Trailer ABS warning lamp does not come
on.
Note: Only towing vehicles built after
March 1, 2001 will be required to have
a trailer ABS warning lamp. The trailer
ABS warning lamp, located on the vehicle
dash, is only activated by a PLC signal
from a trailer or diagnostic tool. The
towing vehicle must be equipped with
an EC-30™ controller with PLC. Verify
correct EC-30™ controller part number.
Verify that a PLC signal is present on the
EC-30™ controller power lines. (Refer to
the EC-30™ controller with PLC section of
this document.) If a PLC signal is present
and the trailer ABS lamp does not come
on at power-up,
go to Section E.
The trailer ABS warning lamp stays on.
This is an indication that the trailer ABS
unit has a fault. Identify the manufacturer
of the trailer ABS unit and follow
recommended steps for diagnosis and
repair. For Bendix® MC-30™ trailer ABS
controller assembly, see SD-13-4834.
If the trailer ABS lamp stays on with no
trailer connected, go to Section E.
The trailer ABS warning lamp should
illuminate within 2 seconds of ignition
NO power being applied to the vehicle.
YES
NO
Verify that the trailer ABS warning
lamp stays on for 2.5 seconds and
then turns off.
YES
The ABS unit is
functioning normally.
No service to ABS
components is needed.
21
SECTION C - TROUBLESHOOTING THE ABS WARNING LAMP
ABS Warning lamp did not illuminate
during the EC-30™ controller powerup sequence.
ABS Warning lamp stays on with no
red LEDs on.
See Note
this page
Turn the ignition off and disconnect
the 30-pin connector from the
EC-30™ controller.
Turn the ignition off and disconnect
the 30-pin connector from the
EC-30™ controller.
Turn the ignition on and verify that
the ABS warning lamp turns on.
YES
NO
See Note
this page
With ignition on, measure voltage
between pin E3 and ground (pins A1,
A2 or A3). Verify a measurement equal NO
to battery voltage. (About 12.0 VDC)
YES
With a volt/ohm meter, check the
ABS warning lamp, wiring, relay and
fuse. Refer to figure 13. When
repair is made, reconnect the 30-pin
connector to the EC-30™ controller
and rerun the power up sequence.
Go to Section A.
Note: If there is no wire in pin E3
of the 30-pin connector, the EC-30™
controller is commanding the ABS
warning lamp, using the J1939
serial communications link.
In this configuration, the actual lamp
is driven by a vehicle dash controller.
Obtain the vehicle manual and verify
the wiring and function of the ABS
warning lamp.
With a volt/ohm meter, check the
wiring, relay and fuse. Refer to
figure 13. When repair is made,
reconnect the 30-pin connector to
the EC-30™ controller and rerun the
power up sequence. If the condition
still exists, replace the EC-30 ™
controller. Go to Section A.
I f having the EC-30 ™ controller
connected was preventing the ABS
warning lamp from doing a powerup lamp check, verify that power
at the EC-30™ controller is getting
cycled with the ignition switch, by
observing the green VLT LED. Check
for corrosion or damage on the 30-pin
connector and wiring. If none is found,
replace the EC-30™ controller.
With a volt/ohm meter, check the
wiring, relay, and fuse. Refer to
figure 13. When repair is made,
reconnect the 30-pin connector to
the EC-30™ controller and rerun the
power up sequence.
Go to Section A.
30-Pin Connector
1
2
3
KJHGF
To verify proper EC-30™ controller
communication, go to Section K.
22
E3
A1,A2,A3
EDCBA
ABS Warning Lamp
Ground
SECTION D - TROUBLESHOOTING THE ATC ACTIVE/WARNING LAMP
ATC Active/Warning lamp did
not illuminate during the EC-30™
controller power-up sequence.
ATC active/warning lamp stays on
with no red LEDs on.
Verify that the EC-30™ controller is
configured for ATC by observing
the LEDs at power-up, blink code
diagnostics or using a diagnostic tool.
Verify that the ATC enable/disable
switch is in the enable position.
See Note
this page
With ignition off, remove the 30-pin
connector from the EC-30™ controller.
If ATC active/warning lamp remains on,
turn ignition off and remove the 30-pin
connector from EC-30™ controller.
See Note
this page
Turn ignition on and measure voltage
between pin C2 and ground (pins A1,
A2 or A3). Verify a measurement
equal to battery voltage. (About
12.0 VDC)
NO
With a volt/ohm meter, check wiring,
ATC active/warning lamp and fuse.
When repair is made, reconnect
the 30-pin connector to the EC-30™
controller and rerun the power-up
sequence. Go to Section A.
Note: If there is no wire in pin
C2 of the 30-pin connector, the
EC-30™ controller is commanding
the ATC active/warning lamp, using
the J1939 serial communications
link.
In this configuration, the actual ATC
lamp is driven by a vehicle dash
controller. Obtain the vehicle manual
and verify the wiring and function of
the ATC active/warning lamp.
To verify proper EC-30™ controller
communication, go to Section K.
YES
With a volt/ohm meter, check the
ATC active/warning lamp circuit
and the ATC enable/disable switch
wiring. Refer to figure 13. When
repair is made, reconnect the 30-pin
connector to the EC-30™ controller
and rerun the power-up sequence.
If the condition still exists, replace
the EC-30™ controller.
Check for corrosion or damage on
the 30-pin connector and wiring.
If none is found, replace the
EC-30™ controller.
30-Pin Connector
1
2
3
KJHGF
C2
A1,A2,A3
F2
EDCBA
ATC Active/Warning Lamp
Ground
ATC Enable/Disable Switch
23
SECTION E - TROUBLESHOOTING THE TRAILER ABS WARNING LAMP
Trailer ABS Warning lamp did
not illuminate during the EC-30™
controller power-up sequence.
Trailer ABS lamp stays on with no
trailer connected to towing vehicle.
See Note
this page
With ignition off, remove the 30-pin
connector from the EC-30™ controller.
With ignition off, remove the 30-pin
connector from EC-30™ controller.
See Note
this page
Turn ignition on and measure voltage
between pin E2 and ground (pins A1,
A2 or A3). Verify a measurement equal
to battery voltage. (About 12.0 VDC)
NO
YES
Only towing vehicles built after
March 1, 2001 will be required to
have a trailer ABS warning lamp.
The trailer ABS warning lamp,
located on the vehicle dash, is only
activated by a PLC signal from
a trailer or diagnostic tool. The
towing vehicle must be equipped
with an EC-30 ™ controller with
PLC. Refer to the part number and
configuration to ensure that the
EC-30™ controller supports PLC
communications.
Check for corrosion or damage on
the 30-pin connector and wiring. If
none is found, replace the EC-30™
controller.
1
2
3
E2
A1,A2,A3
24
With a volt/ohm meter, check wiring,
trailer ABS warning lamp and fuse.
When repair is made, reconnect
the 30-pin connector to the EC-30™
controller and rerun the power up
sequence. Go to Section A.
Note: If there is no wire in pin E2
of the 30-pin connector, the EC-30™
controller is commanding the trailer
ABS warning lamp using the J1939
or J1587 serial communications
link.
In this configuration, the actual trailer
ABS lamp is driven by a vehicle dash
controller. Obtain the vehicle manual
and verify the wiring and function of
the trailer ABS warning lamp.
30-Pin Connector
KJHGF
With a volt/ohm meter, verify no
continuity from trailer ABS warning
lamp connector pin to ground. Refer
to figure 13. Check for corrosion
or damage on the 30-pin connector
and wiring. If no issues are found,
replace the EC-30™ controller.
EDCBA
Trailer ABS Warning Lamp
Ground
To verify proper EC-30™ controller
communication, go to Section K.
SECTION F - DIAGNOSTIC LED QUICK REFERENCE
Comparing your EC-30™ controller to the following images, identify the fault indicated by the diagnostic
LEDs and follow the instructions in the related troubleshooting section.
Power
System OK - A solid green VLT LED
indicates proper voltage is reaching the
EC-30™ controller. If no red LEDs are
on, then no faults are detected.
If either the ABS warning lamp or ATC
active/warning lamp is on with no red
LEDs, go to Section C or D.
Voltage Out of Range - A flashing green
VLT LED indicates ECU voltage below
9.0 VDC or above 16.0 VDC. The VLT
LED will flash until power is brought into
normal range. Go to Section G.
No Voltage - When the VLT LED is off,
the EC-30™ controller is receiving very
low or no voltage. The ECU LED may be
on in this case. Go to Section G.
ABS Modulator Fault
The red MOD LED is on to indicate a
fault condition with an ABS modulator.
The example shown is a front right
modulator fault. Troubleshooting and
repair are the same for a fault on any
ABS modulator.
The indicated modulator fault may be a
static or dynamic fault.
Static faults are related to wiring or
component failures, such as open or
short circuits.
Dynamic modulator faults are related
to abnormal wheel speed behaviors
during ABS.
Go to Section I.
Wheel Speed Sensor Fault
The red SEN LED is on to indicate
a fault condition with a wheel speed
sensor. The example shown is a front
right sensor fault. Troubleshooting and
repair are the same for a fault on any
wheel speed sensor.
The indicated sensor fault may be a
static or dynamic fault.
Static faults are related to wiring or
component failures, such as open or
short circuits.
Dynamic faults are related to abnormal
wheel speed signals or behaviors.
Go to Section H.
ATC Fault
Engine Communication
Fault
The red TRC LED is on to
indicate a communication
fault between the EC-30™
controller and the engine
controller.
Go to Section K.
ATC Modulator Fault
The red TRC and MOD
LEDs are on to indicate a
static fault condition with
the ATC modulator. Static
faults are related to wiring or
component failures such as
open or short circuits.
Go to Section J.
ECU Fault - The red ECU LED is on to indicate a fault condition
internal to the EC-30™ controller. Reset the EC-30™ controller
with a magnet. If the fault returns, replace the EC-30™ controller.
If the red ECU LED is on and the green VLT LED is off, the
EC-30™ controller may have very low voltage.
Magnetic Fault Reset - All LEDs will be on while a magnet
is held in place at the RESET location. If one or more LEDs
do not come on, replace the EC-30™ controller. Do not reset
fault codes until troubleshooting of the indicated component
is complete.
25
SECTION G - TROUBLESHOOTING POWER TO THE EC-30™ CONTROLLER
ABS Warning lamp is on and green
VLT LED is off or flashing.
Due to corrosion, damage or
poor termination, the wiring and/
or connectors may be limiting the
electrical current flow to the EC-30™
controller. This means that when the
EC-30™ controller needs more current,
the voltage level may be dropping.
In order to measure the voltage
under load, place a load, such as a
type 1157 stop lamp bulb, between
ignition power (pins B1, K2, K3) and
ground (pins A1, A2, A3) at the 30-pin
connector. While the lamp is in place,
measure the voltage across the pins. It
is important to check each power and
ground pin combination. The operating
range of the EC-30 is 9.0-16.0 VDC.
Verify a measurement equal to battery
voltage. (About 12.0 VDC) The loaded
voltage should drop no more than 1.0
VDC from the measured unloaded
voltage.
With a volt/ohm meter, check the
power and ground wiring. Look
for corroded or damaged wires
or connectors. If repair is made,
reconnect the 30-pin connector to
the EC-30™ controller and rerun the
power up sequence.
Go to Section A.
Turn the ignition off and disconnect
the 30-pin connector from the EC-30™
controller.
Turn the ignition on and measure voltage
between ignition power (pins B1, K2,
K3) and ground (pins A1, A2, A3) at the
30-pin connector. It is important to check
each power and ground pin combination.
YES The operating range of the EC-30 ™
controller is 9.0 -16.0 VDC. Verify a
measurement equal to battery voltage.
(About 12.0 VDC)
NO
With a volt/ohm meter, check the
power wiring, ground wiring and
fuse. Look for corroded or damaged
wires or connectors. When repair
is made, reconnect the 30-pin
connector to the EC-30™ controller
and rerun the power up sequence.
Go to Section A.
Measure the loaded
voltage across a type
1157 stop lamp bulb.
30-Pin Connector
If proper loaded and unloaded voltage
is measured at the 30-pin connector
and no corrosion or damage is found
on the EC-30™ controller connector,
replace the EC-30™ controller.
26
1
2
3
KJHGF
EDCBA
A1,A2,A3
B1,K2,K3
Ground
Power
SECTION H - TROUBLESHOOTING WHEEL SPEED SENSORS
Turn ignition off and remove the 30-pin
or 18-pin connector from the EC-30 ™
controller.
SEN LED and ABS
warning lamp are on.
Make repairs to wiring or replace
wheel speed sensor. Reconnect all
connectors to the EC-30™ controller
and sensor. Reset fault codes by
briefly holding a magnet in place at
the RESET location of the diagnostic
display. Then rerun the power up
sequence. Go to Section A.
YES
Static Wheel Speed Sensor Faults - Using
a volt/ohm meter to measure the connector
pins of the faulted sensor, verify 1500-2500
OHMS across sensor connector pins.
Verify no continuity from sensor connector
pins to ground. Verify ignition power is
not measured at either sensor connector
pins. Check for corroded or damaged
sensor and ECU wiring and connectors.
Verify proper sensor lead routing and
clamping. If a circuit fault is found, isolate
the area needing repair by repeating the
measurements at all connections in the
wheel speed sensor circuit.
Wheel speed sensor fault identified?
NO
Make repairs to wheel speed sensor
installation. Reconnect all connectors
to the EC-30™ controller and sensor.
Reset fault codes by briefly holding
a magnet in place at the RESET
location of the diagnostic display.
Then rerun the power up sequence.
Go to Section A.
18-Pin Connector
30-Pin Connector
1
2
3
1
2
3
FED
CBA
KJHG F
Dynamic Wheel Speed Sensor Faults Rotate the effected wheel and verify for (a)
WS-20 speed sensors, a minimum of 0.8 VAC
sensor output @ 1 RPS across the wheel
speed sensor pins, or (b) for WS-24 speed
sensors, a minimum of 0.250 VAC @ 0.5
RPS. A properly positioned sensor can output
more than 2.0 VAC @ 1 RPS. Adjust speed
sensors to contact tone ring. Verify condition
and retention force of sensor clips. Verify
proper sensor lead routing and clamping. Verify
sensor leads are twisted pair. Verify condition
of tone ring mounting and teeth. Verify proper
number of tone ring teeth per sensed wheel.
Verify proper adjustment of wheel bearings.
Verify condition of foundation brakes.
EDCBA
B3
B2
Right Mid WS Right Mid WS +
H3
H2
Right Front WS Right Front WS +
C3
C2
Left Mid WS Left Mid WS +
J2
J1
Left Front WS Left Front WS +
E3
E2
Right Rear WS Right Rear WS +
A1,A2,A3
B1,K2,K3
Ground
Power
F3
F2
Left Rear WS Left Rear WS +
27
SECTION I - TROUBLESHOOTING ABS MODULATORS
MOD LED and ABS
warning lamp are on.
Turn the ignition off and remove the
30-pin or 18-pin connector from the
EC-30™ controller.
Static ABS Modulator Faults. For (a) M-30
modulator verify 3.5 to 5.0 OHMS across Hold to
Common connector pins, 3.5 to 5.0 OHMS across
Exhaust to Common connector pins, and 7.0 to 10.0
OHMS across Exhaust to Hold connector pins, or for
(b) M-32 modulator verify 4.9 to 5.5 OHMS across
Hold to Source connector pins, 4.9 to 5.5 OHMS
across Exhaust to Source connector pins, and 9.8 to
YES 11.0 OHMS across Exhaust to Hold connector pins.
Verify no continuity from modulator connector pins
to ground. Verify ignition power is not measured at
any modulator connector pins. Check for corroded
or damaged modulator wiring and connections. If a
circuit fault is found, isolate the area needing repair
by repeating the measurements at all connections
in the ABS modulator circuit.
ABS modulator fault identified?
Make repairs to wiring or replace ABS
modulator. Reconnect all connectors
to the EC-30™ controller and ABS
modulator. Reset fault codes by
briefly holding a magnet in place at
the RESET location of the diagnostic
display. Then rerun the power up
sequence. Go to Section A.
NO
Make repairs to ABS modulator
installation or wheel end. Reconnect
all connectors to the EC-30™ controller
and ABS modulator. Reset fault
codes by briefly holding a magnet in
place at the RESET location of the
diagnostic display. Then rerun the
power up sequence.
Go to Section A.
18-Pin Connector
brake pressure applied at power-up (chuff
test) and/or using diagnostic tool. Check
for dragging brakes, dry bearings, faulty
return springs, parking brake system
faults, restricted brake air lines, over
adjusted slacks, out-of-round drums or
damaged/loose tone rings.
Electrical connector on the M-30™,
M-22™ or M-22™ Modulator
30-Pin Connector
1
2
3
1
2
3
FED
CBA
KJHGF
EDCBA
F1 Left Rear Mod Common
D1 Left Rear Mod Exhaust
E1 Left Rear Mod Hold
H1 Left Front Mod Common
F1 Left Front Mod Exhaust
G1 Left Front Mod Hold
A1 Right Rear Mod Common
C1 Right Rear Mod Exhaust
B1 Right Rear Mod Hold
C1 Right Front Mod Common
E1 Right Front Mod Exhaust
D1 Right Front Mod Hold
A1,A2,A3
B1,K2,K3
28
Dynamic ABS Modulator Faults
- Verify proper modulator activation with
Ground
Power
Exhaust
A
Common
B
Hold
C
SECTION J - TROUBLESHOOTING THE ATC MODULATOR
TRC and MOD LEDs and ATC
active/warning lamp are on.
Make repairs to wiring or replace ATC
modulator. Reconnect all connectors
to the EC-30™ controller and ATC
modulator. Reset fault codes by
briefly holding a magnet in place at
the RESET location of the diagnostic
display. Then rerun the power-up
sequence. Go to Section A.
Turn the ignition off and remove the
18-pin connector from the EC-30™
controller.
Verify 10.0 to 12.0 OHMS across
the ATC modulator leads. Verify
no continuity from ATC modulator
connector pins to ground. Verify
+12 VDC is not measured at any
ATC modulator connector pins.
Check for corroded or damaged ATC
modulator wiring and connectors.
If a circuit fault is found, isolate the
area needing repair by repeating the
measurements at all connections in
the ATC modulator circuit.
18-Pin Connector
1
2
3
FED
CBA
18-Pin Connector
2-pin ATC
Modulator
Connector
EC-30™ controller and
ATR Valve Assembly
29
SECTION K - TROUBLESHOOTING EC-30™ CONTROLLER
SERIAL COMMUNICATION
TRC LED and ATC active/warning
lamp are on.
Verify proper operation of the electronic
engine controller.
Turn ignition off and remove the 30-pin
connector from the EC-30™ controller.
Also remove the 2- or 3-pin connector
at engine controller.
For vehicles using J1939, verify
continuity between the 30-pin
connector (pins C3, D2, D3) and
the 3-pin engine or dash controller
connector.
Warning lamp(s) controlled by
serial communication link not
functioning properly.
If the EC-30™ controller has just been
configured or replaced, verify that the
EC-30™ controller is configured to
operate the warning lamp(s) using the
appropriate serial communications
link. The Bendix ABS Diagnostic
Software program will be needed to
verify this level of configuration. If the
EC-30™ controller was replaced with
the correct replacement part number,
this step is not necessary.
If the EC-30™ controller is configured
properly, verify proper operation of
the vehicle dash controller.
For vehicles using J1922, verify
wire continuity between the 30-pin
connector (pins B2, B3) and the 2-pin
engine or dash controller connector.
For vehicles using J1587, verify
wire continuity between the 30-pin
connector (pins G2, G3) and the 2-pin
dash controller connector.
Verify no continuity from serial
communication pins to ground
(except pin D2). Verify +12 VDC is not
measured at any serial communication
pin. Check for corroded or damaged
serial communication wiring and
connections. If a circuit fault is found,
isolate the area needing repair
by repeating the measurements
at all serial communication link
connectors.
Turn ignition off and remove the
30-pin connector from the EC-30™
controller. Also remove the dash
controller connector.
30-Pin Connector
1
2
3
KJHGF
C3 Engine Communication, J1939 H
D3 Engine Communication, J1939 L
D2 Engine Communication, J1939 Shield
B2
B3
Make repairs to serial communication
wiring. Reconnect all connectors to the
EC-30™ controller and engine. Reset
any fault codes by briefly holding
a magnet in place at the RESET
location of the diagnostic display.
Then rerun the power-up sequence.
Go to Sections A and B.
30
EDCBA
Engine Communication, J1922 +
Engine Communication, J1922 -
G2 Diagnostic, J1587, Serial A
G3 Diagnostic, J1587, Serial B
NOTES
31
32
BW2160 © 2008 Bendix Commercial Vehicle Systems LLC All rights reserved. 2/2008. Printed in U.S.A.
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