Mitsubishi 380. Manual — part 685

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-150

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

terminal 6 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-323

.

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 CAN_H 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 3 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

18 .

NO : If the resistance measures less than 1 k

Ω, go to Step

16.

AC209364

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AC209364

AC209364

AC209364

AC209364

AC209364

AC209364JH

HARNESS SIDE: C-02

TEST
HARNESS

16DB408A

CONNECTOR: C-02

AC209364

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AC209364

AC209364

AC209364

AC209364

AC209364

AC209364HZ

HARNESS SIDE: C-02

TEST
HARNESS

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-151

STEP 16. 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 17.
NO : Repair the damaged parts.

STEP 17. Check the CAN_ H line (communication line only)
between the SRS-ECU connector and joint connector for a
short circuit. Measure the resistance at joint connector
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 C-02 and SRS-ECU connector

C-121, and measure the resistance at the wiring harness
side of joint connector 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.

16DB478A

CONNECTOR: C-121

HARNESS SIDE

C-121 (Y)

48

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27

28

29

30

31

32

33

34

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36

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38

39

40

41

42

43

44

45

46

47

16DB408A

CONNECTOR: C-02

16DB478A

CONNECTOR: C-121

HARNESS SIDE

C-121 (Y)

48

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-152

(4) Measure the resistance between joint connector terminal 3

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-323

.

NO : If the resistance measures less than 1 k

Ω, repair the

wiring harness between joint connector C-02 and
SRS-ECU connector C-121.

STEP 18. Check the CAN_H line (communication line only)
between joint connector (3) and the data link 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)

terminal 7 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, go to Step

19 .

NO : If the resistance measures less than 1 k

Ω, repair the

wiring harness between joint connector (3) and the
data link connector.

AC209364

11
22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

AC209364

AC209364

AC209364

AC209364

AC209364

AC209364HZ

HARNESS SIDE: C-02

TEST
HARNESS

16DB408A

CONNECTOR: C-02

AC209364

11
22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

AC209364

AC209364

AC209364

AC209364

AC209364

AC209364IC

HARNESS SIDE: C-02

TEST HARNESS

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-153

STEP 19. Check the CAN_H line (communication line only)
between intermediate connector C-29 and joint connector
(3) 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 intermediate connector C-29 and 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)

terminal 9 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-323

.

NO : If the resistance measures less than 1 k

Ω, repair the

wiring harness between intermediate connector C-29
and joint connector (3).

16DB479A

CONNECTORS: C-02, C-29

C-02

C-02

C-29

C-29

AC209364

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14

2

13

1

12

AC209364

AC209364

AC209364

AC209364

AC209364

AC209364ID

HARNESS SIDE: C-02

TEST HARNESS