Mitsubishi 380. Manual — part 718

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-283

(4) Measure the resistance between intermediate connector

terminal 12 and joint connector (3) terminal 20.

OK: 2 ohms or less

(5) Measure the resistance between intermediate connector

terminal 11 and joint connector (3) terminal 9.

OK: 2 ohms or less

CAUTION

Strictly observe the specified wiring harness repair proce-
dure. For details refer to

P.54C-5

.

Q: Do all the resistances measure 2 ohms or less?

YES : If all the resistances measure 2 ohms or less, go to

Step 2.

NO : If either of the resistances measures more than 2

ohms or all the resistances measure more than 2
ohms, repair the wiring harness between joint
connector (3) and the intermediate connector, and
then go to Step 2.

AC204582

35

34

36

30

38

29

17

13 12 11

37

31

33 32

26

27

28

16

14

15

3 2

4

18

6

7

21 20

5

19

9

10

24 23

25

8

22

1

TEST
HARNESS

FEMALE SIDE: C-29

HARNESS SIDE: C-02

TEST
HARNESS

11
22

10
21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

DF

AC204582

35

34

36

30

38

29

17

13 12 11

37

31

33 32

26

27

28

16

14

15

3 2

4

18

6

7

21 20

5

19

9

10

24 23

25

8

22

1

TEST
HARNESS

FEMALE SIDE: C-29

HARNESS SIDE: C-02

TEST HARNESS

11
22

10
21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

DE

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-284

STEP 8. Check the front wiring harness side CAN bus lines
(communication line including the ENGINE-ECU, A/T-ECU
and the ABS-ECU). Measure the resistance at intermediate
connector C-29.

NOTE: when diagnosing CAN-BUS on vehicles with
manual transmission (M/T), disregard A/T-ECU and it’s wir-
ing circuits and check between ABS-ECU and
ENGINE-ECU only.

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 measure the

resistance at the male side (at front wiring harness side).

(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 11 and 12.

OK: 120

± 20 Ω

Q: Does the resistance measure 120

± 20 Ω?

YES : If the resistance measures 120

± 20 Ω, go to Step 15.

NO : If the resistance does not measure 120

± 20 Ω, go to

Step 9 .

52DB014A

CONNECTOR: C-29

AC204582

2 3

27

32

28

33

16

15

4 5

19

18

29

17

34

7 8

35

22

21

9 10

30

36

31

37

25

24

23

6

20

1

14

26

11

13

12

38

BX

TEST
HARNESS

TEST
HARNESS

MALE SIDE: C-29

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-285

STEP 9. Check ABS-ECU connector A-02 and A/T-ECU
connector B-19 for loose, corroded or damaged terminals,
or terminals pushed back in the connector.

NOTE: when diagnosing CAN-BUS on vehicles with
manual transmission (M/T), disregard A/T-ECU and it’s wir-
ing circuits and check between ABS-ECU and
ENGINE-ECU only.

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

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: Are ABS-ECU connector A-02 and A/T-ECU connector

B-19 in good condition?
YES : Go to Step 10.
NO : Repair the damaged parts. Then go to Step 8.

16DB402A

A-02 (GR)

CONNECTOR: A-02

A-02 HARNESS CONNECTOR:

16DB480A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

A/T

CONTROL

UNIT

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-286

STEP 10. Check the CAN bus lines between the ABS-ECU
and the A/T-ECU (communication line including the
A/T-ECU). Measure the resistance at ABS-ECU connector
A-02.

NOTE: when diagnosing CAN-BUS on vehicles with
manual transmission (M/T), disregard A/T-ECU and it’s wir-
ing circuits and check between ABS-ECU and
ENGINE-ECU only.

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 ABS-ECU connector A-02, and measure the

resistance at the wiring harness side of ABS-ECU
connector A-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 ABS-ECU connector

terminals 15 and 26.

OK: 120

± 20 Ω

Q: Does the resistance measure 120

± 20 Ω?

YES : If the resistance measures 120

± 20 Ω, go to Step 13.

NO : If the resistance does not measure 120

± 20 Ω, go to

Step 11 .

16DB402A

A-02 (GR)

CONNECTOR: A-02

A-02 HARNESS CONNECTOR:

16DB506A

TEST
HARNESS

TEST

HARNESS

HARNESS SIDE: A-02