Mitsubishi Galant 9G. Manual — part 1344

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-480

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-481

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

P.54C-304

).

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-482

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

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-483

(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 23.

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