Mitsubishi Galant 9G. Manual — part 1359

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-540

STEP 19. Check multi-center display unit (middle-grade
type) connector C-05 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 multi-center display unit (middle-grade type)

connector C-05 in good condition?
YES : Go to Step 20.
NO : Repair the damaged parts.

STEP 20. Using scan tool MB991958, diagnose the CAN
bus line (Disconnect multi-center display unit
(middle-grade type) connector C-05, and check the
multi-center display unit (middle-grade type) system).
(1) Disconnect multi-center display unit (middle-grade type)

connector C-05.

(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 the multi-center display unit (middle-grade type)

connector C-05.

Q: Does the MUT-III screen correspond to the illustration?

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

go to Step 21 .

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

illustration, go to Step 22.

AC305233 AF

CONNECTOR: C-05

HARNESS SIDE

C-05 (B)

AC305233 AF

CONNECTOR: C-05

HARNESS SIDE

C-05 (B)

AC306075

: Red section on screen

AF

ETACS

-ECU

AC-ECU

SRS-ECU

C.DISPLAY

MUT

J/C

METER

-ECU

PCM

ABS-ECU

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-541

STEP 21. Check the CAN bus lines between joint
connector (3) and the multi-center display unit
(middle-grade type). Measure the resistance between joint
connector (3) C-02 and multi-center display unit
(middle-grade type) connector C-05.

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 joint connector (3) C-02 and multi-center display

unit (middle-grade type) connector C-05, and measure the
resistance at the wiring harness sides of joint connector (3)
C-02 and multi-center display unit (middle-grade type)
connector C-05.

(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.

AC305231AP

CONNECTOR: C-02

AC305233 AF

CONNECTOR: C-05

HARNESS SIDE

C-05 (B)

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-542

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

terminal 8 and middle-grade multi-center display connector
terminal 13.

OK: 2 ohms or less

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

terminal 19 and middle-grade multi-center display
connector terminal 12.

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 multi-center display (middle-grade type)
may be suspected. Diagnose the multi-center display
(middle-grade type). Refer to GROUP 54A,
Multi-center display, equipment diagnosis

P.54A-252

.

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 joint
connector (3) and the multi-center display unit
(middle-grade type) connector.

AC204582

HARNESS SIDE: C-02

TEST
HARNESS

11

22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

8

2

10 9

1

5

3

4

6

7

20191817161514131211

TEST
HARNESS

HARNESS SIDE: C-05

CJ

AC204582

HARNESS SIDE: C-02

CK

11

22

10

21

9

20

8

19

7

18

6

17

5

16

4

15

3

14

2

13

1

12

8

2

10 9

1

5

3

4

6

7

20191817161514131211

HARNESS SIDE: C-05

TEST
HARNESS

TEST
HARNESS

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-543

STEP 22. Check the CAN bus lines between joint
connector (3) and the data link connector. Measure the
resistance between joint connector (3) C-02 and data link
connector C-125.

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 joint connector (3) C-02, and measure the

resistance between the wiring harness side connector of
joint connector (3) C-02 and wiring harness side connector
of data link connector C-125.

(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.

AC305232

C-125

CONNECTORS: C-02, C-125

AF

C-02

C-02

C-125 (B)