Mitsubishi Galant (2004+). Manual - part 490

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-571

DIAGNOSTIC ITEM 17: Diagnose the lines between CAN main bus line and the powertrain control 
module <Vehicles without ABS>

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 so, a component con-
nected to the CAN bus line may be damaged.

.

POWERTRAIN
CONTROL MODULE

JOINT
CONNECTOR (3)

COMBINATION
METER

AC306248AB

B-19 (B)

CONNECTOR: B-19

AIR
CLEANER

PCM

AC305231AX

CONNECTORS: C-02, C-29

C-02

C-29

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-572

TROUBLE JUDGMENT
If the MUT-III cannot received signals from the 
powertrain control module, CAN bus line connec-
tor(s) are broken or an open circuit has occurred.

.

COMMENTS ON TROUBLE SYMPTOM
The wiring harness wire or connectors may have 
loose, corroded, or damage terminals, or terminals 
pushed back in the connector, or the powertrain con-
trol module may be defective.

.

TROUBLESHOOTING HINTS

• The wiring harness or connectors may have 

loose, corroded, or damage terminals, or termi-
nals pushed back in the connector

• The powertrain control module may be defective

DIAGNOSIS

Required Special Tool:

• MB991223: Harness Set

STEP 1. Check intermediate connector C-29 and 
powertrain control module connector B-19 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: Are intermediate connector C-29 and powertrain control 

module connector B-19 in good condition?
YES : Go to Step 2.
NO :  Repair the damaged parts. Replace the joint 

connector as necessary.

AC306248AD

B-19 (B)

CONNECTOR: B-19

PCM

AIR
CLEANER

HARNESS SIDE

AC305231AI

CONNECTOR: C-29

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-573

STEP 2. Check the CAN bus lines between intermediate 
connector C-29 and the powertrain control module. 
Measure the resistance between intermediate connector 

C-29 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 intermediate connector C-29 and powertrain 

control module connector B-19, and measure the resistance 
between the wiring harness side connector of powertrain 
control module connector B-19 and the male side connector 
of intermediate connector C-29 (at front wiring harness 
side).

(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.

AC306248AD

B-19 (B)

CONNECTOR: B-19

PCM

AIR
CLEANER

HARNESS SIDE

AC305231AI

CONNECTOR: C-29

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-574

(4) Measure the resistance between intermediate connector 

terminal 11 and powertrain control module connector 

terminal 17.

OK: 2 ohms or less

(5) Measure the resistance between intermediate connector 

terminal 12 and powertrain control module connector 

terminal 18.

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 3.

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 intermediate 
connector C-29 and the powertrain control module 
connector. 

AC204582

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

AC204582

TEST 
HARNESS

3

17

10

13

18

4

11

14

7

16 15

1

2

5

12

9

6

8

JAE

HARNESS SIDE: B-19

TEST 
HARNESS

CY

MALE SIDE: C-29

AC204582

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

AC204582

TEST 
HARNESS

HARNESS SIDE: B-19

TEST 
HARNESS

3

17

10

13

18

4

11

14

7

16 15

1

2

5

12

9

6

8

JAE

CX

MALE SIDE: C-29