Mitsubishi Galant 9G. Manual — part 1265

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-164

(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 54.
NO : If the voltage measures more than 1.0 V, repair the

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

STEP 54. 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

.

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-165

(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.

(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 55.
NO : If the voltage measures more than 1.0 V, repair the

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

AC305206

CONNECTOR: A-02

AG

A-02 (GR)

HARNESS SIDE

AC306248AD

B-19 (B)

CONNECTOR: B-19

PCM

AIR
CLEANER

HARNESS SIDE

AC209365GJ

HARNESS SIDE: B-19

TEST HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-166

STEP 55. 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 7 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.

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

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-167

DIAGNOSTIC ITEM 4: Diagnose shorts in the ground to CAN bus line <Vehicles without ABS and
vehicles without multi-center display (middle-grade type)>

CAUTION

When servicing a CAN bus line, ground yourself
by touching a metal object such as an unpainted
water pipe. If you fail to do this, a component
connected to the CAN bus line may be damaged.

DATA LINK
CONNECTOR

ETACS-ECU

POWERTRAIN
CONTROL MODULE

JOINT
CONNECTOR (3)

COMBINATION
METER

A/C-ECU

SRS-ECU

NOTE

: MANUAL AIR CONDITIONING SYSTEM <LOW>
: MANUAL AIR CONDITIONING SYSTEM <MIDDLE>
OR AUTOMATIC AIR CONDITIONING SYSTEM