Mitsubishi Galant (2004+). Manual - part 470

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-491

(4) Measure the resistance between joint connector (3) 

terminal 18 and data link connector terminal 14.

OK: 2 ohms or less

(5) Measure the resistance between joint connector (3) 

terminal 7 and data link connector terminal 6.

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, refer to 

diagnostics item 7: Check the CAN_L and H lines for 
a short circuit (Refer to 

P.54C-313

).

NO :  If all the resistances measure 2 ohms or less, repair 

the wiring harness between joint connector (3) and 
the data link connector.

AC204582DI

11

22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

TEST 
HARNESS

HARNESS SIDE: C-02

TEST 
HARNESS

Y

8

16

15

7

5

1314

6

12

4

2

1011

3

9

1

HARNESS SIDE: C-125

AC204582

HARNESS SIDE: C-02

TEST 
HARNESS

DH

11

22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

Y

8

16

15

7

5

1314

6

12

4

2

1011

3

9

1

TEST 
HARNESS

HARNESS SIDE: C-125

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-492

STEP 20. Check 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: Is powertrain control module connector B-19 in good 

condition?
YES : Go to Step 21.
NO :  Repair the damaged parts.

AC306248AD

B-19 (B)

CONNECTOR: B-19

PCM

AIR
CLEANER

HARNESS SIDE

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-493

STEP 21. Using scan tool MB991958, diagnose the CAN 
bus line (Disconnect powertrain control module connector 
B-19, and check the powertrain control module system).

(1) Disconnect powertrain control module connector B-19.
(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) Connect powertrain control module connector B-19.
Q: Does the MUT-III screen correspond to the illustration?

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

go to Step 22 .

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

illustration, refer to diagnostics item 3: Check the 
CAN_L and H lines for a short circuit (Refer to 

P.54C-123

).

AC306248AD

B-19 (B)

CONNECTOR: B-19

PCM

AIR
CLEANER

HARNESS SIDE

AC306073

: Red section on screen

PCM

METER

-ECU

AB

MUT

ETACS

-ECU

AC-ECU

SRS-ECU

J/C

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-494

STEP 22. 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