Mitsubishi Galant (2004+). Manual - part 364

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-67

STEP 38. Check SRS-ECU connector C-121 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 SRS-ECU connector C-121 in good condition?

YES : Go to Step 39.
NO :  Repair the damaged parts.

AC305233 AJ

CONNECTOR: C-121

HARNESS SIDE

C-121 (Y)

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DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-68

STEP 39. Check the CAN_L line (communication line only) 
between the SRS-ECU connector and the intermediate 
connector for a short circuit. Measure the voltage at 

intermediate connector C-22.

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 intermediate connector C-22 and SRS-ECU 

connector C-121, and measure the voltage at the male side 
of intermediate connector C-22 (at floor wiring harness 
side).

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

(3) Measure the voltage between intermediate connector 

terminal 23 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-465

.

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

wiring harness between intermediate connector C-22 
and SRS-ECU connector.

AC305234AC

CONNECTORS: C-22, C-121

C-121 HARNESS SIDE

C-121 (Y)

C-22 (Y)

C-22

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AC209365

AC209365GF

MAIL SIDE: C-22

TEST 
HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-69

STEP 40. Check the CAN_L line (communication line only) 
between joint connector (3) and the intermediate 
connector for a short circuit. 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 intermediate connector C-22 and 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) terminals 

14 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 k

Ω or more?

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

bus lines thoroughly by referring to 

P.54C-465

.

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

wiring harness between intermediate connector C-22 
and joint connector (3).

AC305231AP

CONNECTOR: C-02

AC305233 AI

CONNECTOR: C-22

C-22 (Y)

AC209365

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AC209365

AC209365GE

HARNESS SIDE: C-02

TEST 
HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-70

STEP 41. Check the CAN_L line (communication line only) 
between joint connector (3) and the data link 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 

18 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, go to Step 42.
NO :  If the voltage measures more than 1.0 V, repair the 

wiring harness between joint connector (3) and the 
data link connector.

AC305231AP

CONNECTOR: C-02

AC209365

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AC209365

AC209365GH

HARNESS SIDE: C-02

TEST HARNESS