Mitsubishi Galant (2004+). Manual - part 377

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-119

STEP 47. Check the CAN_L line (communication line only) 
between intermediate connector C-29 and ABS-ECU 
connector 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 ABS-ECU 

connector A-02, and measure the voltage at the male side 
of intermediate connector C-29 (at front wiring harness 
side).

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

(3) Measure the voltage between intermediate connector 

terminal 12 and body ground.

OK: 1.0 V or less

CAUTION

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

P.54C-5

.

Q: Does the voltage measure 1.0 V or less?

YES : If the voltage measures 1.0 V or less, go to Step 48.
NO :  If the voltage measures more than 1.0 V, repair the 

wiring harness between intermediate connector C-29 
and ABS-ECU connector.

AC305206

CONNECTOR: A-02

AG

A-02 (GR)

HARNESS SIDE

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

GA

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-120

STEP 48. Check the CAN_L line (communication line only) 
between the powertrain control module connector and 
ABS-ECU connector for a short to the power supply. 
Measure voltage at powertrain control module connector 

B-19.

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 

ABS-ECU connector A-02, and measure the voltage at the 
harness side of powertrain control module connector B-19.

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

AC305206

CONNECTOR: A-02

AG

A-02 (GR)

HARNESS SIDE

AC306248AD

B-19 (B)

CONNECTOR: B-19

PCM

AIR
CLEANER

HARNESS SIDE

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-121

(3) Measure the voltage between powertrain control module 

connector terminal 18 and body ground.

OK: 1.0 V or less

CAUTION

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

P.54C-5

.

Q: Does the voltage measure 1.0 V or less?

YES : If the voltage measures 1.0 V or less, go to Step 49.
NO :  If the voltage measures more than 1.0 V, repair the 

wiring harness between powertrain control module 
connector and ABS-ECU connector.

AC209365GJ

HARNESS SIDE: B-19

TEST HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-122

STEP 49. Check the CAN_L line inside the ABS-ECU for a 
short to the power supply. Measure the voltage at 
ABS-ECU connector A-02 for loose, corroded or damaged 

terminals, or terminals pushed back in the connector.

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.

(2) Connect special tool MB991970 (ABS check harness) to 

the ABS-ECU and the wiring harness, and measure the 
voltage at special tool MB991970 (ABS check harness).

(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between special tool MB991970 (ABS 

check harness) connector terminal 17 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-498

.

NO :  If the voltage measures more than 4.0 V, replace the 

ABS-ECU.

AC305206

CONNECTOR: A-02

AG

A-02 (GR)

HARNESS SIDE

AC209767

2

19

1

18

25

8

15

16

17

27

28

26

11

9

10

12

13

14

23

24

22 21

7 6

5

4

20

3

TEST 
HARNESS

SPECIAL TOOL
MB991970

ABS-
ECU

AB

MEASURE AT THIS CONNECTOR

SPECIAL TOOL MB991970 
CONNECTOR