Mitsubishi 380. Manual - part 710

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-250

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.

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

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.

16DB408A

CONNECTOR: C-02

AC209438

AC209438

TEST 
HARNESS

AS

TEST 

HARNESS

1110 9 8 7 6 5 4 3 2 1
22 21201918 171615141312

HARNESS SIDE: C-02

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-251

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.

16DB477A

C-15 HARNESS SIDE

CONNECTOR:  C-15

C-15 (B)

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-252

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.

16DB408A

CONNECTOR: C-02

16DB477A

C-15 HARNESS SIDE

CONNECTOR:  C-15

C-15 (B)

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-253

(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.

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-323

.

NO :  If the resistance measures less than 1 k

Ω, replace the 

A/C-ECU.

AC209438

AC209438

TEST 
HARNESS

AS

TEST 

HARNESS

1110 9 8 7 6 5 4 3 2 1
22 21201918 171615141312

HARNESS SIDE: C-02

16DB477A

C-15 HARNESS SIDE

CONNECTOR:  C-15

C-15 (B)

AC209438

AC209438

COMPONENT SIDE: C-15

AY

TEST 
HARNESS

TEST 
HARNESS