Diagnostic Procedure with Diagnostic Trouble Code (DTC)

CRUISE CONTROL SYSTEM (DIAGNOSTIC)

8. Diagnostic Procedure with

Diagnostic Trouble Code

(DTC)

A: DTC 21, 24, 25 AND 2A CRUISE

CONTROL MODULE BUILT-IN RE-

LAY, CPU RAM

DIAGNOSIS:

• Poor welding of built-in relay of cruise control module.

• Failure of built-in CPU RAM of cruise control module.

TROUBLE SYMPTOM:

• Cruise control is canceled and memorized cruise speed is also canceled.

• Once cruise control is canceled, cruise control cannot be set until the ignition switch and cruise control main switch turns OFF, and then turns ON again.

NOTE:

Check input/output signal and vehicle speed signal with select monitor. When signals are in good condition, failure is in cruise control module. (Check the power supply and ground conditions of cruise control module.)

CC(H4SO)-29

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

CRUISE CONTROL SYSTEM (DIAGNOSTIC)

B: DTC 22 VEHICLE SPEED SENSOR

DIAGNOSIS:

Disconnection or short circuit of vehicle speed sensor system.

TROUBLE SYMPTOM:

Cruise control cannot be set. (Cancelled immediately.)

WIRING DIAGRAM:

BATTERY

IGNITION

RELAY

M/B No.5

TCM

C17

C:

B56

AT : AT MODEL

MT : MT MODEL

LT

XL

LT

XL

TB

: LHD TURBO

MODEL

: EXCEPT LHD

TURBO MODEL

: TURBO MODEL

NA

: NON-TURBO

MODEL

B17

:

NA

1 2 3

B17

:

TB

1 2

3 4

B94

1 2 3 4 5 6 7 8 9 10

11 12 13 14 15 16 17 18 19 20

F2

1 2 3 4 5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

AT MT

CRUISE

CONTROL

MODULE

B94

B21

:

XL

F60

:

LT

1 2 3 4

5 6 7 8

9 10 11 12

13 14 15 16

E E

GE

C: B56

1 2 3 4

10 11 12 13

5 6

14 15

7

16

8

17

9

18

19 20 21 22 23 24

LT

B21

E2

LT

B17

2

3

1

VEHICLE SPEED

SENSOR

(MT MODEL)

B100

F2

F60

E2

CC-00042

CC(H4SO)-30

1

2

3

4

5

6

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

CRUISE CONTROL SYSTEM (DIAGNOSTIC)

Step

CHECK TRANSMISSION TYPE.

Check

Is the target MT model?

Yes

Go to step 2.

No

Go to step 6.

CHECK HARNESS BETWEEN BATTERY

AND VEHICLE SPEED SENSOR.

1) Turn the ignition switch to OFF.

2) Disconnect the harness connector from vehicle speed sensor.

3) Turn the ignition switch to ON.

4) Measure the voltage between vehicle speed sensor harness connector terminal and chassis ground.

Connector & terminal

(B17) No. 3 (+) — Chassis ground (

−

):

Is the voltage more than 10 V? Go to step 3.

CHECK HARNESS BETWEEN CRUISE CON-

TROL MODULE AND VEHICLE SPEED SEN-

SOR.

1) Turn the ignition switch to OFF.

2) Disconnect the harness connector from cruise control module.

3) Measure the resistance between vehicle speed sensor harness connector terminal and cruise control module harness connector terminal.

Connector & terminal

(B17) No. 1 — (B94) No. 19:

Is the resistance less than 10

Ω?

CHECK HARNESS BETWEEN VEHICLE

SPEED SENSOR AND ENGINE GROUND.

1) Turn the ignition switch to OFF.

2) Measure the resistance between vehicle speed sensor harness connector terminal and engine ground.

Connector & terminal

(B17) No. 2 — Engine ground:

Is the resistance less than 10

Ω?

Is the voltage less than 0 V

←

→ more than 5 V?

CHECK VEHICLE SPEED SENSOR.

1) Connect the harness connector to vehicle speed sensor.

2) Lift-up the vehicle and support with rigid racks.

3) Drive the vehicle at speed greater than 20 km/h (12 MPH).

Go to step 4.

Go to step 5.

Check the harness for open or short between fuse relay and vehicle speed sensor.

Repair the harness.

Repair the harness.

Replace the cruise control module.

<Ref. to CC-7,

Cruise Control

Module.>

Replace the vehicle speed sensor.

Warning:

Be careful not to be caught up by the running wheels.

4) Measure the voltage between cruise control module harness connector terminal and chassis ground.

Connector & terminal

(B94) No. 19 (+) — Chassis ground (

−

):

CHECK HARNESS BETWEEN CRUISE CON-

TROL MODULE AND TCM.

1) Turn the ignition switch to OFF.

2) Disconnect the harness connector from

TCM and cruise control module.

3) Measure the resistance between cruise control module harness connector terminal and TCM harness connector terminal.

Connector & terminal

(B94) No. 19 — (B56) No. 17:

Is the resistance less than 10

Ω?

Go to step 7.

Repair the harness.

CC(H4SO)-31

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

CRUISE CONTROL SYSTEM (DIAGNOSTIC)

7

Step

CHECK TCM.

1) Connect the harness connector to TCM.

2) Lift-up the vehicle and support with rigid racks.

3) Drive the vehicle faster than 10 km/h (6

MPH).

Warning:

Be careful not to be caught by the running wheels.

4) Measure the voltage between TCM harness connector terminal and chassis ground.

Connector & terminal

(B56) No. 17 (+) — Chassis ground (

−

):

Check

Is the voltage less than 0 V

←

→ more than 5 V?

Yes No

Replace the cruise control module.

<Ref. to CC-7,

Cruise Control

Module.>

Replace the TCM.

<Ref. to 4AT-77,

Transmission Control Module

(TCM).>

CC(H4SO)-32

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

CRUISE CONTROL SYSTEM (DIAGNOSTIC)

C: DTC 28 WIRING HARNESS OPENED.

1

2

Step

CHECK BATTERY.

Measure the battery specific gravity of electrolyte.

CHECK FUSES, CONNECTORS AND HAR-

NESSES.

Check the condition of fuses, and harnesses and connectors. Also check for proper grounding.

Check

Is the battery specific gravity more than 1.260?

Is there anything unusual about the appearance of fuse, harness, connector and grounding?

Yes

Go to step 2.

Repair or replace the faulty parts.

No

Charge or replace

the battery. Go to step 2.

End of inspection.

CC(H4SO)-33

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

CRUISE CONTROL SYSTEM (DIAGNOSTIC)

D: DTC 35 AND 36 ACTUATOR MOTOR

DIAGNOSIS:

Open or poor contact of cruise control actuator motor.

TROUBLE SYMPTOM:

Cruise control cannot be set. (Cancelled immediately.)

WIRING DIAGRAM:

CRUISE CONTROL

MODULE

B94

B7

1 2 3

4 5 6

B94

1 2 3 4 5 6 7 8 9 10

11 12 13 14 15 16 17 18 19 20

CRUISE CONTROL

ACTUATOR

B7

E

CC(H4SO)-34

CC-00036

1

2

3

4

5

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

CRUISE CONTROL SYSTEM (DIAGNOSTIC)

Step Check Yes

CHECK POWER SUPPLY.

1) Turn the ignition switch to OFF.

2) Disconnect the harness connector from cruise control actuator.

3) Turn the ignition switch to ON.

4) Turn the cruise control main switch to ON.

5) Measure the voltage between cruise control actuator harness connector terminal and chassis ground.

Terminals

(B7) No. 4 (+) — Chassis ground (

−

):

Is the voltage more than 10 V? Go to step 2.

No

Check the harness for open or short between cruise control module and cruise control actuator.

CHECK GROUND CIRCUIT OF ACTUATOR.

1) Turn the ignition switch and cruise control main switch to OFF.

2) Measure the resistance between cruise control actuator harness connector terminal and chassis ground.

Terminals

(B7) No. 6 — Chassis ground:

Is the resistance less than 10

Ω?

Go to step 3.

MEASURE RESISTANCE OF ACTUATOR.

Measure the resistance of cruise control actuator motor.

Terminals

No. 4 — No. 1:

No. 4 — No. 2:

No. 4 — No. 5:

Is the resistance approx. 5

Ω? Go to step 4.

Go to step 5.

CHECK HARNESS BETWEEN ACTUATOR

AND CRUISE CONTROL MODULE.

1) Disconnect the harness connector from cruise control module.

2) Measure the resistance between cruise control module harness connector terminal and cruise control actuator harness connector terminal.

Connector & terminal

(B7) No. 1 — (B94) No. 7:

Is the resistance less than 10

Ω?

CHECK HARNESS BETWEEN ACTUATOR

AND CRUISE CONTROL MODULE.

Measure the resistance between cruise control module harness connector terminal and cruise control actuator harness connector terminal.

Connector & terminal

(B7) No. 5 — (B94) No. 5:

Is the resistance less than 10

Ω?

Repair the harness.

Replace the cruise control actuator.

<Ref. to CC-5,

Actuator.>

Repair the harness.

Replace the cruise control module.

<Ref. to CC-7,

Cruise Control

Module.>

Repair the harness.

CC(H4SO)-35

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

CRUISE CONTROL SYSTEM (DIAGNOSTIC)

E: DTC 37 ACTUATOR MOTOR CLUTCH

DIAGNOSIS:

Open or poor contact of cruise control actuator motor clutch.

TROUBLE SYMPTOM:

Cruise control cannot be set. (Cancelled immediately.)

WIRING DIAGRAM:

CRUISE CONTROL

MODULE

B94

B7

1 2 3

4 5 6

B94

1 2 3 4 5 6 7 8 9 10

11 12 13 14 15 16 17 18 19 20

CRUISE CONTROL

ACTUATOR

B7

E

CC(H4SO)-36

CC-00036

1

2

3

4

5

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

CRUISE CONTROL SYSTEM (DIAGNOSTIC)

Step Check Yes

CHECK POWER SUPPLY.

1) Turn the ignition switch to OFF.

2) Disconnect the harness connector from cruise control actuator.

3) Turn the ignition switch to ON.

4) Turn the cruise control main switch to ON.

5) Measure the voltage between cruise control actuator harness connector terminal and chassis ground.

Terminals

(B7) No. 4 (+) — Chassis ground (

−

):

Is the voltage more than 10 V? Go to step 2.

No

Check the harness for open or short between cruise control module and cruise control actuator.

CHECK GROUND CIRCUIT OF ACTUATOR.

1) Turn the ignition switch and cruise control main switch to OFF.

2) Measure the resistance between cruise control actuator harness connector terminal and chassis ground.

Terminals

(B7) No. 6 — Chassis ground:

Is the resistance less than 10

Ω?

Go to step 3.

MEASURE RESISTANCE OF ACTUATOR

CLUTCH.

Measure the resistance of cruise control actuator clutch.

Terminals

No. 3 — No. 6:

Is the resistance approx. 39

Ω? Go to step 4.

Go to step 5.

CHECK HARNESS BETWEEN ACTUATOR

AND CRUISE CONTROL MODULE.

1) Disconnect the harness connector from cruise control module.

2) Measure the resistance between cruise control module harness connector terminal and cruise control actuator harness connector terminal.

Connector & terminal

(B7) No. 2 — (B94) No. 13:

Is the resistance less than 10

Ω?

CHECK HARNESS BETWEEN ACTUATOR

AND CRUISE CONTROL MODULE.

Measure the resistance between cruise control module harness connector terminal and cruise control actuator harness connector terminal.

Connector & terminal

(B7) No. 3 — (B94) No. 14:

Is the resistance less than 10

Ω?

Repair the harness.

Replace the cruise control actuator.

<Ref. to CC-5,

Actuator.>

Repair the harness.

Replace the cruise control module.

<Ref. to CC-7,

Cruise Control

Module.>

Repair the harness.

CC(H4SO)-37

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

CRUISE CONTROL SYSTEM (DIAGNOSTIC)

F: DTC 38 MOTOR DRIVE SHAFT DOES NOT ENGAGE PROPERLY.

1

Step

CHECK ACTUATOR MOTOR.

1) Turn the ignition switch to OFF.

2) Disconnect the harness connector from cruise control actuator.

3) Remove the cruise control actuator from mounting bracket.

4) Pull the cable by hand to check for looseness or status of inner gear engagement.

Check

Are foreign particles caught in the inner gear or does inner gear engage and disengage improperly?

Yes No

Replace the cruise control actuator.

<Ref. to CC-5,

Actuator.>

Check the cruise control cable

adjustment. <Ref. to CC(H4SO)-5,

CABLE FREE

PLAY, INSPEC-

TION, General

Description.>

G: DTC 39 MOTOR IS OVERLOADED.

1

Step Check Yes No

CHECK THE OPERATING CURRENT TO AC-

TUATOR MOTOR.

1) Connect the Subaru Select Monitor to data link connector.

2) Try to drive the vehicle while operating the cruise control system.

3) Measure the operation current to the cruise control actuator motor.

Connector & terminal

(B7) No. 4 — Chassis ground:

Is the voltage more than 10 A? Replace the cruise Check the power control module.

<Ref. to CC-7,

Cruise Control

Module.>

supply circuit.

<Ref. to

CC(H4SO)-13,

CHECK POWER

SUPPLY, Diagnostic Procedure with

Symptom.>

CC(H4SO)-38

CRUISE CONTROL SYSTEM

(DIAGNOSTIC)

CC(H4DOTC)

Page

1.

General Description ....................................................................................2

General Description

CRUISE CONTROL SYSTEM (DIAGNOSTIC)

1. General Description

A: SPECIFICATION

Specifications for 2.0 L turbo model are included in

CC(H4SO) section. <Ref. to CC(H4SO)-2, Basic Diagnostic Procedure.>

CC(H4DOTC)-2

CRUISE CONTROL SYSTEM

(DIAGNOSTIC)

CC(H4DOTC 2.5)

Page

1.

Basic Diagnostic Procedure ........................................................................2

2.

General Description ....................................................................................4

3.

Electrical Components Location..................................................................5

4.

Engine Control Module (ECM) I/O Signal ...................................................6

5.

Subaru Select Monitor.................................................................................8

6.

Diagnostic Procedure with Symptom ........................................................10

7.

List of Diagnostic Trouble Code (DTC) .....................................................13

8.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) .....................16