Mitsubishi Galant 9G. Manual — part 1255

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-124

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 powertrain control module connector B-19 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.

AC306248AD

B-19 (B)

CONNECTOR: B-19

PCM

AIR
CLEANER

HARNESS SIDE

AC305232

CONNECTORS: C-101, C-125

AH

C-101

C-125

C-125 (B)

C-101 HARNESS SIDE

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-125

(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-520

.

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

30.

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

AC305231AI

CONNECTOR: C-29

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-126

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

26.

AC305231AI

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

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-127

STEP 6. Check joint connector (3) C-02 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

.

Check the joint connector at the wiring harness side for loose,
corroded or damaged terminals, or terminals pushed back in
the connector, and also check the short pin behind the connec-
tor for corrosion, deformation and delamination.
Q: Is joint connector (3) C-02 in good condition?

YES : Go to Step 7.
NO : Repair the damaged parts. Replace the joint

connector as necessary.

AC305231AP

CONNECTOR: C-02

AC209350

1

12

2

13

3

14

4

15

5

16

6

17

7

18

8

19

9

20

10

21

11

22

AB

SHORT PIN