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