Mitsubishi Galant (2004+). Manual - part 428

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-323

STEP 12. Check the CAN_L and H lines (communication 
lines including the A/C-ECU) between joint connector (3) 
and the A/C-ECU for a short circuit. 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 6 and 17.

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 

16  .

NO :  If the resistance measures less than 1 k

Ω, go to Step 

13.

AC305231AP

CONNECTOR: C-02

AC209438

AC209438

TEST 
HARNESS

AS

TEST 
HARNESS

1110 9 8 7 6 5 4 3 2 1

22 21201918 1716 15 14 1312

HARNESS SIDE: C-02

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-324

STEP 13. Check A/C-ECU connector C-10 <manual air 
conditioning system (low)> or C-15 <manual air 
conditioning system (middle) or automatic air conditioning 
system> 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-10 <manual air conditioning 

system (low)> or C-15 <manual air conditioning system 
(middle) or automatic air conditioning system> in good 
condition?
YES : Go to Step 14.
NO :  Repair the damaged parts.

AC305234AB

C-10 HARNESS SIDE

C-15 HARNESS SIDE

CONNECTORS: C-10, C-15

C-10 (B)

C-15 (B)

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-325

STEP 14. Check the CAN_L and H lines (communication 
lines only) between joint connector (3) and the A/C-ECU for 
a short circuit. 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-10 <manual air conditioning system (low)> or 
C-15 <manual air conditioning system (middle) or automatic 
air conditioning system>, 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.

AC305231AP

CONNECTOR: C-02

AC305234AB

C-10 HARNESS SIDE

C-15 HARNESS SIDE

CONNECTORS: C-10, C-15

C-10 (B)

C-15 (B)

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-326

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

terminals 6 and 17.

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, go to Step 

15  .

NO :  If the resistance measures less than 1 k

Ω, repair the 

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

AC209438

AC209438

TEST 
HARNESS

AS

TEST 
HARNESS

1110 9 8 7 6 5 4 3 2 1

22 21201918 1716 15 14 1312

HARNESS SIDE: C-02