Mitsubishi Galant (2004+). Manual - part 488

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-563

STEP 25. Check the CAN bus lines between the ABS-ECU 
and the powertrain control module. Measure the resistance 
between ABS-ECU connector A-02 and 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 ABS-ECU connector A-02 and powertrain 

control module connector B-19, and measure the resistance 
between each wiring harness side connector.

(2) Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION

Disconnect the negative battery terminal. For details refer 
to 

P.54C-4

.

(3) Disconnect the negative battery terminal.

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-564

(4) Measure the resistance between ABS-ECU connector 

terminal 23 and powertrain control module connector 

terminal 18.

OK: 2 ohms or less

(5) Measure the resistance between ABS-ECU connector 

terminal 24 and powertrain control module connector 

terminal 17.

OK: 2 ohms or less

CAUTION

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

P.54C-5

.

Q: Do all the resistances measure 2 ohms or less?

YES  : If all the resistances measure 2 ohms or less, go to 

Step 26.

NO  :  If either of the resistances measures more than 2 

ohms or all the resistances measure more than 2 
ohms, repair the wiring harness between ABS-ECU 
connector and the powertrain control module 
connector. 

AC204582

HARNESS SIDE: A-02

HARNESS SIDE: B-19

TEST 
HARNESS

TEST 
HARNESS

3

17

10

13

18

4

11

14

7

16 15

1

2

5

12

9

6

8

JAE

19

18

2

1

25

8

15

16

17

27

28

26

11

9

10

12

13

14

23

24

22 21

7

6

5

4

20

3

CU

AC204582

3

17

10

13

18

4

11

14

7

16 15

1

2

5

12

9

6

8

JAE

19

18

2

1

25

8

15

16

17

27

28

26

11

9

10

12

13

14

23

24

22 21

7

6

5

4

20

3

HARNESS SIDE: A-02

HARNESS SIDE: B-19

TEST 
HARNESS

TEST 
HARNESS

CT

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-565

STEP 26. Check the CAN bus lines inside the ABS-ECU. 

Measure the resistance 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, and measure the 

resistance at the component side of ABS-ECU connector 
A-02.

(2) Turn the ignition switch to the "LOCK" (OFF) position.

CAUTION

Disconnect the negative battery terminal. For details refer 
to 

P.54C-4

.

(3) Disconnect the negative battery terminal.

(4) Measure the resistance between ABS-ECU connector 

terminals 7 and 23.

OK: 2 ohms or less

(5) Measure the resistance between ABS-ECU connector 

terminals 24 and 25.

OK: 2 ohms or less

CAUTION

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

P.54C-5

.

Q: Do all the resistances measure 2 ohms or less?

YES  : If all the resistances measure 2 ohms or less, power 

supply to the powertrain control module may be 
suspected. Diagnose the engine. Refer to GROUP 
13A, MFI diagnasis 

P.13A-944

 <2.4L engine> or 

GROUP 13B, MFI diagnasis 

P.13B-968

 <3.8L 

engine>.

NO  :  If either of the resistances measures more than 2 

ohms or all the resistances measure more than 2 
ohms, replace the ABS-ECU.

AC305206

CONNECTOR: A-02

AG

A-02 (GR)

HARNESS SIDE

AC209438

COMPONENT SIDE: A-02

TEST 
HARNESS

AC

TEST 
HARNESS

AC209438

COMPONENT SIDE: A-02

AD

TEST 
HARNESS

TEST 
HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-566

STEP 27. Using scan tool MB991958, diagnose the CAN 
bus line (Disconnect ABS-ECU connector A-02, and check 
the ABS-ECU system).

(1) Disconnect ABS-ECU connector A-02.
(2) Turn the ignition switch to the "ON" position.

(3) Diagnose CAN bus lines, and check if the MUT-III screen is 

as shown in the illustration.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Check ABS-ECU connector A-02.
Q: Does the MUT-III screen correspond to the illustration?

YES  : If the MUT-III screen corresponds to the illustration, 

go to Step 28 .

NO  :  If the MUT-III screen does not correspond to the 

illustration, refer to diagnostics item 9: Check the 
CAN_L and H lines for a short circuit (Refer to 

P.54C-369

).

AC305206

CONNECTOR: A-02

AG

A-02 (GR)

HARNESS SIDE

AC306075

: Red section on screen

AB

PCM

METER

-ECU

ETACS

-ECU

AC-ECU

SRS-ECU

C.DISPLAY

MUT

J/C

ABS-ECU