Mitsubishi Galant (2004+). Manual - part 381

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-135

STEP 11. Check the CAN_H line (communication line only) 
between joint connector (3) and ETACS-ECU connector for 
a short to the power supply. Measure the voltage at joint 

connector (3) C-02.

CAUTION

A digital multimeter should be used. For details refer to 

P.54C-4

.

CAUTION

The test wiring harness should be used. For details refer to 

P.54C-4

.

(1) Disconnect joint connector (3) C-02 and ETACS-ECU 

connector C-218, and measure the voltage at the wiring 
harness side of joint connector (3) C-02.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between joint connector (3) terminal 5 

and body ground.

OK: 1.0 V or less

CAUTION

Strictly observe the specified wiring harness repair proce-
dure. For details refer to 

P.54C-5

.

Q: Does the voltage measure 1.0 V or less?

YES : If the voltage measures 1.0 V or less, diagnose CAN 

bus lines thoroughly by referring to 

P.54C-534

.

NO :  If the voltage measures more than 1.0 V, repair the 

wiring harness between joint connector (3) and the 
ETACS-ECU connector.

AC305231AP

CONNECTOR: C-02

AC305413

C-218 (GR)

CONNECTOR: C-218

AI

HARNESS SIDE

JUNCTION BLOCK
(REAR VIEW)

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AC209365

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AC209365

AC209365

HARNESS SIDE: C-02

TEST HARNESS

FR

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-136

STEP 12. Check the CAN_H line (communication line 
including the A/C-ECU) between joint connector (3) and 
the A/C-ECU connector for a short to the power supply. 

Measure the voltage at joint connector (3) C-02.

CAUTION

A digital multimeter should be used. For details refer to 

P.54C-4

.

CAUTION

The test wiring harness should be used. For details refer to 

P.54C-4

.

(1) Disconnect joint connector (3) C-02, and measure the 

voltage at the wiring harness side of joint connector (3) 
C-02.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between joint connector (3) terminal 6 

and body ground.

OK: 4.0 V or less

Q: Does the voltage measure 4.0 V or less?

YES : If the voltage measures 4.0 V or less, go to Step 15.
NO :  If the voltage measures more than 4.0 V, go to Step 

13.

STEP 13. Check A/C-ECU connector C-15 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.

CAUTION

The strand end of the twisted wire should be within 10 cm 
(4 inches) from the connector. For details refer to 

P.54C-4

.

Q: Is A/C-ECU connector C-15 in good condition?

YES : Go to Step 14.
NO :  Repair the damaged parts.

AC305231AP

CONNECTOR: C-02

AC209365

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AC209365

AC209365

HARNESS SIDE: C-02

FS

TEST HARNESS

AC305233 AH

CONNECTOR: C-15

HARNESS SIDE

C-15 (B)

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-137

STEP 14. Check the CAN_H line (communication line only) 
between joint connector (3) and A/C-ECU connector for a 
short to the power supply. Measure the voltage at joint 

connector (3) C-02.

CAUTION

A digital multimeter should be used. For details refer to 

P.54C-4

.

CAUTION

The test wiring harness should be used. For details refer to 

P.54C-4

.

(1) Disconnect joint connector (3) C-02 and A/C-ECU 

connector C-15, and measure the voltage at the wiring 
harness side of joint connector (3) C-02.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between joint connector (3) terminal 6 

and body ground.

OK: 1.0 V or less

CAUTION

Strictly observe the specified wiring harness repair proce-
dure. For details refer to 

P.54C-5

.

Q: Does the voltage measure 1.0 V or less?

YES : If the voltage measures 1.0 V or less, diagnose CAN 

bus lines thoroughly by referring to 

P.54C-534

.

NO :  If the voltage measures more than 1.0 V, repair the 

wiring harness between joint connector (3) and the 
A/C-ECU connector.

AC305231AP

CONNECTOR: C-02

AC305233 AH

CONNECTOR: C-15

HARNESS SIDE

C-15 (B)

AC209365

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AC209365

AC209365

HARNESS SIDE: C-02

FS

TEST HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-138

STEP 15. Check the CAN_H line (communication line 
including the SRS-ECU) between joint connector (3) and 
the SRS-ECU connector for short to the power supply. 

Measure the voltage at joint connector (3) C-02.

CAUTION

A digital multimeter should be used. For details refer to 

P.54C-4

.

CAUTION

The test wiring harness should be used. For details refer to 

P.54C-4

.

(1) Disconnect joint connector (3) C-02, and measure the 

voltage at the wiring harness side of joint connector (3) 
C-02.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between joint connector (3) terminal 3 

and body ground.

OK: 4.0 V or less

Q: Does the voltage measure 4.0 V or less?

YES : If the voltage measures 4.0 V or less, go to Step 21.
NO :  If the voltage measures more than 4.0 V, go to Step 

16.

STEP 16. Check intermediate connector C-22 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.

CAUTION

The strand end of the twisted wire should be within 10 cm 
(4 inches) from the connector. For details refer to 

P.54C-4

.

Q: Is intermediate connector C-22 in good condition?

YES : Go to Step 17.
NO :  Repair the damaged parts.

AC305231AP

CONNECTOR: C-02

AC209365

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AC209365FU

HARNESS SIDE: C-02

TEST 
HARNESS

AC305233 AI

CONNECTOR: C-22

C-22 (Y)