Mitsubishi Galant (2004+). Manual - part 442

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-379

STEP 11. Check the ETACS-ECU for short circuit. Measure 

the resistance at ETACS-ECU connector C-218.

CAUTION

A digital multimeter should be used. For details refer to 

P.54C-4

.

(1) Disconnect ETACS-ECU connector C-218, and measure 

the resistance at the component side of ETACS-ECU 
connector C-218.

(2) Measure the resistance between ETACS-ECU connector 

terminals 72 and 73.

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, replace the 

ETACS-ECU.

AC305413

C-218 (GR)

CONNECTOR: C-218

AI

HARNESS SIDE

JUNCTION BLOCK
(REAR VIEW)

68

74

63

66

72

73

67

65 64

61

70

71

62

69

60

57

58

59

56 55

52

54 53

51

AC209438

COMPONENT SIDE: C-218

AO

TEST 
HARNESS

5859

74

68

57

56

72

656667

73

54

63

52

70

61

53

62

71

64

55

51

60

69

TEST 
HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-380

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.

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

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

AC305233 AH

CONNECTOR: C-15

HARNESS SIDE

C-15 (B)

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-381

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-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) 

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.

AC305231AP

CONNECTOR: C-02

AC305233 AH

CONNECTOR: C-15

HARNESS SIDE

C-15 (B)

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-382

STEP 15. Check the A/C-ECU for short circuit. Measure the 

resistance at A/C-ECU connector C-15.

CAUTION

A digital multimeter should be used. For details refer to 

P.54C-4

.

(1) Disconnect A/C-ECU connector C-15, and measure the 

resistance at the component side of A/C-ECU connector 
C-15.

(2) Measure the resistance between A/C-ECU connector 

terminals 14 and 15.

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, replace the 

A/C-ECU.

AC305233 AH

CONNECTOR: C-15

HARNESS SIDE

C-15 (B)

AC209438

AC209438

COMPONENT SIDE: C-15

AY

TEST 
HARNESS

TEST 
HARNESS