Mitsubishi 380. Manual — part 711

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-254

STEP 16. Check the CAN_L and H lines (communication
lines including the SRS-ECU) between joint connector (3)
and the SRS-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 3 and 14.

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

20 if vehicle has multi-centre display or go to Step 24
if vehicle not equipped with multi-centre display .

NO : If the resistance measures less than 1 k

Ω, go to Step

17.

16DB408A

CONNECTOR: C-02

AC209438

11

22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

TEST
HARNESS

AV

TEST

HARNESS

HARNESS SIDE: C-02

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-255

STEP 17. Check the CAN_L and H lines (communication
lines 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.

(4) Measure the resistance between intermediate connector

terminals 3 and 14.

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, repair the

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

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

16DB408A

CONNECTOR: C-02

AC209438

11

22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

TEST
HARNESS

AV

TEST

HARNESS

HARNESS SIDE: C-02

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-256

STEP 18. 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 19.
NO : Repair the damaged parts.

STEP 19. Check the SRS-ECU for short circuit. Measure
the resistance at SRS-ECU connector C-121.

CAUTION

A digital multimeter should be used. For details refer to

P.54C-4

.

(1) Disconnect SRS-ECU connector C-121, and measure the

resistance at the component side of SRS-ECU connector
C-121.

(2) Measure the resistance between SRS-ECU connector

terminals 32 and 43.

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

SRS-ECU.

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

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

AC209438

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

AC209438

TEST
HARNESS

AU

TEST

HARNESS

COMPONENT SIDE: C-121

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-257

STEP 20. Check the CAN_L and H lines (communication
lines including the multi-center display unit ) between joint
connector (3) and the middle-grade multi-center display
for a short circuit. Measure the resistance at joint
connector (3) C-02.

NOTE: If vehicle not equipped with multi-centre display go
to Step 24

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 8 and 19.

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

24 .

NO : If the resistance measures less than 1 k

Ω, go to Step

21.

STEP 21. Check multi-center display unit connector C-05
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 multi-center display unit connector C-05 in good

condition?
YES : Go to Step 22.
NO : Repair the damaged parts.

16DB408A

CONNECTOR: C-02

AC209438

AC209438

TEST
HARNESS

AW

TEST

HARNESS

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

HARNESS SIDE: C-02

16DB490A

CONNECTOR: C-05

HARNESS SIDE

C-05 (B)