Mitsubishi 380. Manual - part 690

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-170

STEP 36. Check the CAN_L line (communication line only) 
between joint connector (3) and A/C-ECU connector for 
short to ground. 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 A/C-ECU 

connector C-15 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.

16DB408A

CONNECTOR: C-02

16DB477A

C-15 HARNESS SIDE

CONNECTOR:  C-15

C-15 (B)

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-171

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

terminal 17 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 37. Check the CAN_L 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 14 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 

40   .

NO :  If the resistance measures less than 1 k

Ω, go to Step 

38.

AC209364

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18

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1

12

AC209364

AC209364HY

HARNESS SIDE: C-02

TEST 
HARNESS

16DB408A

CONNECTOR: C-02

AC209364IK

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18

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12

HARNESS SIDE: C-02

TEST 
HARNESS

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-172

STEP 38. 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 39.
NO :  Repair the damaged parts.

STEP 39. Check the CAN_L line (communication line only) 
between the SRS-ECU connector and joint connector for a 
short circuit. Measure the resistance at joint connector 
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 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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34

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36

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38

39

40

41

42

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45

46

47

16DB408A

CONNECTOR: C-02

16DB478A

CONNECTOR: C-121

HARNESS SIDE

C-121 (Y)

48

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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-173

(4) Measure the resistance between intermediate connector 

terminal 14 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 intermediate connector C-29 
and SRS-ECU connector.

STEP 40. Check the CAN_L 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 18 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 

41   .

NO :  If the resistance measures less than 1 k

Ω, repair the 

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

AC209364IK

11
22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

HARNESS SIDE: C-02

TEST 
HARNESS

16DB408A

CONNECTOR: C-02

AC209364IM

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21

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18

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1

12

HARNESS SIDE: C-02

TEST HARNESS