Mitsubishi 380. Manual - part 656

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-35

(3) Measure the voltage between data link connector terminal 6 

and body ground.

OK: 4.0 V or less

Q: Does the voltage measure 4.0 V or less?

YES : If the voltage measures 4.0 V or less, go to Step 3.
NO :  If the voltage measures more than 4.0 V, go to Step 4.

AC209365

HARNESS SIDE: C-125

TEST 
HARNESS

FN

Y

8

16

15

7

5

1314

6

12

4

2

1011

3

9

1

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-36

STEP 3. Check the CAN_L-side bus line (communication 

line including ECUs) for a short to the power supply. 

Measure the voltage at data link connector C-125.

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 ENGINE-ECU connector B-21 and combination 

meter connector C-101, and measure the voltage at the 
harness side of data link connector C-125.

(2) Turn the ignition switch to the "ON" position.

16DB400A

COVER

ENGINE
CONTROL
UNIT

AIR
CLEANER

16DB475A

CONNECTORS: C-101, C-125

C-101

C-125

C-125 (B)

C-101 HARNESS SIDE

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-37

(3) Measure the voltage between data link connector terminal 

14 and body ground.

OK: 4.0 V or less

Q: Does the voltage measure 4.0 V or less?

YES : If the voltage measures 4.0 V or less, diagnose CAN 

bus lines thoroughly by referring to 

P.54C-323

.

NO :  If the voltage measures more than 4.0 V, go to Step 

27.

STEP 4. Check intermediate connector C-29 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 intermediate connector C-29 in good condition?

YES : Go to Step 5.
NO :  Repair the damaged parts.

AC209365

HARNESS SIDE: C-125

FO

TEST 
HARNESS

Y

8

16

15

7

5

1314

6

12

4

2

1011

3

9

1

52DB014A

CONNECTOR: C-29

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54C-38

STEP 5. Check the CAN_H-side bus line (communication 
line including ECUs) of the front wiring harness for a short 
to the power supply. Measure the voltage at intermediate 
connector C-29.

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 

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

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between intermediate connector 

terminal 11 and body ground.

OK: 4.0 V or less

Q: Does the voltage measure 4.0 V or less?

YES : If the voltage measures 4.0 V or less, go to Step 6.
NO :  If the voltage measures more than 4.0 V, go to Step 

23.

52DB014A

CONNECTOR: C-29

AC209365

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

AC209365

MALE SIDE: C-29

TEST 
HARNESS

FP