Mitsubishi Galant 9G. Manual — part 1260

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-144

STEP 28. Check the CAN_H 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-145

(3) Measure the voltage between powertrain control module

connector terminal 17 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 29.
NO : If the voltage measures more than 1.0 V, repair the

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

STEP 29. Check the CAN_H line inside the ABS-ECU for a
short to the power supply. Measure the voltage at
ABS-ECU connector A-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 ABS-ECU connector A-02.

AC209365

AC209365

AC209365FZ

HARNESS SIDE: B-19

TEST
HARNESS

AC305206

CONNECTOR: A-02

AG

A-02 (GR)

HARNESS SIDE

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-146

(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 25 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, replace the

ABS-ECU.

STEP 30. 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 31.
NO : Repair the damaged parts.

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

MEASURE AT THIS CONNECTOR

SPECIAL TOOL MB991970
CONNECTOR

AC

AC305231AI

CONNECTOR: C-29

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-147

STEP 31. Check the CAN_L-side bus line (communication
line including ) 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 12 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 32.
NO : If the voltage measures more than 4.0 V, go to Step

52.

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