Mitsubishi Galant (2004+). Manual - part 422

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-299

STEP 40. Check the CAN_L line (communication line only) 
between joint connector (3) and A/C-ECU connector for 
short to ground. Measure the resistance 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 resistance at the wiring 
harness side of joint connector (3) C-02.

(2) Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION

Disconnect the negative battery terminal. For details refer 
to 

P.54C-4

.

(3) Disconnect the negative battery terminal.

(4) Measure the resistance between joint connector (3) 

terminal 17 and body ground.

OK: 1 k

Ω or more

CAUTION

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

P.54C-5

.

Q: Does the resistance measure 1 k

Ω or more?

YES : If the resistance measures 1 k

Ω or more, diagnose 

CAN bus lines thoroughly by referring to 

P.54C-534

.

NO :  If the resistance measures less than 1 k

Ω, 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)

AC209364

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22

10

21

9

20

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18

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17

5

16

4

15

3

14

2

13

1

12

AC209364

AC209364HY

HARNESS SIDE: C-02

TEST 
HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-300

STEP 41. Check the CAN_L line (communication line 
including the SRS-ECU) between joint connector (3) and 
the SRS-ECU connector for short to ground. Measure the 

resistance 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 

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

(2) Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION

Disconnect the negative battery terminal. For details refer 
to 

P.54C-4

.

(3) Disconnect the negative battery terminal.

(4) Measure the resistance between joint connector (3) 

terminals 14 and body ground.

OK: 1 k

Ω or more

Q: Does the resistance measure 1 k

Ω or more?

YES : If the resistance measures 1 k

Ω or more, go to Step 

47   .

NO :  If the resistance measures less than 1 k

Ω, go to Step 

42.

STEP 42. 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 43.
NO :  Repair the damaged parts.

AC305231AP

CONNECTOR: C-02

AC209364IK

11

22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

HARNESS SIDE: C-02

TEST 
HARNESS

AC305233 AI

CONNECTOR: C-22

C-22 (Y)

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-301

STEP 43. Check the CAN_L-side bus line (communication 
line including ECUs) of the floor wiring harness for short 
to ground. Measure the resistance 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 measure the 

resistance at the male side (at floor wiring harness side).

(2) Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION

Disconnect the negative battery terminal. For details refer 
to 

P.54C-4

.

(3) Disconnect the negative battery terminal.

(4) Measure the resistance between intermediate connector 

terminal 23 and body ground.

OK: 1 k

Ω or more

Q: Does the resistance measure 1 k

Ω or more?

YES : If the resistance measures 1 k

Ω or more, go to Step 

46   .

NO :  If the resistance does not measure 1 k

Ω or more, go 

to Step 44.

STEP 44. 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 45.
NO :  Repair the damaged parts.

AC305233 AI

CONNECTOR: C-22

C-22 (Y)

AC209364IL

MAIL SIDE: C-22

TEST 
HARNESS

AC305233 AJ

CONNECTOR: C-121

HARNESS SIDE

C-121 (Y)

48

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46

47

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-302

STEP 45. Check the CAN_L line (communication line only) 
between the SRS-ECU connector and the intermediate 
connector for a short circuit. Measure the resistance 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 resistance at the male 
side of intermediate connector C-22 (at floor wiring harness 
side).

(2) Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION

Disconnect the negative battery terminal. For details refer 
to 

P.54C-4

.

(3) Disconnect the negative battery terminal.

(4) Measure the resistance between intermediate connector 

terminal 23 and body ground.

OK: 1 k

Ω or more

Q: Does the resistance measure 1 k

Ω or more?

YES : If the resistance measures 1 k

Ω or more, diagnose 

CAN bus lines thoroughly by referring to 

P.54C-534

.

NO :  If the resistance measures less than 1 k

Ω, repair the 

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

AC305233 AT

CONNECTORS: C-22, C-121

C-121 (Y)

C-22 (Y)

AC209364IL

MAIL SIDE: C-22

TEST 
HARNESS