Mitsubishi Galant 9G. Manual — part 1346

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-488

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

• MB991970: ABS Check Harness

STEP 1. Check data link connector C-125 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 data link connector C-125 in good condition?

YES : Go to Step 2.
NO : Repair the damaged parts.

AC305231AR

CONNECTOR: C-125

C-125 (B)

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-489

STEP 2. Check the CAN bus lines at the data link
connector. Measure the resistance at the 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) Measure the resistance at the data link 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.

(4) Measure the resistance between data link connector

terminals 6 and 14.

Q: How much resistance is measured?

2 ohms or less : Diagnostic Item 8: Check the CAN_L and

H lines for a short circuit. Refer to

P.54C-331

.

No continuity : Diagnostic Item 11: Diagnose terminator

resistors at both ends. Refer to

P.54C-407

.

More than 2 ohms but continuity exists : Go to Step 3.

AC305231AR

CONNECTOR: C-125

C-125 (B)

AC204740

AC204740

AC204740

AC204740

AC204740

AC204740

AC204740

AC204740

AC204740DA

TEST
HARNESS

TEST
HARNESS

HARNESS SIDE: C-125

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-490

STEP 3. Check intermediate connector C-29 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 intermediate connector C-29 in good condition?

YES : Go to Step 4.
NO : Repair the damaged parts.

STEP 4. Using scan tool MB991958, diagnose the CAN bus
line (Disconnect intermediate connector C-29, and then
determine that a failure is present at either the front wiring
harness side or the instrument panel wiring harness side).
(1) Disconnect intermediate connector C-29.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.

(2) Connect scan tool MB991958 to the data link connector.
(3) Turn the ignition switch to the "ON" position.

AC305231AI

CONNECTOR: C-29

AC305231AI

CONNECTOR: C-29

AC206894

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

DIAGNOSIS

TSB Revision

CONTROLLER AREA NETWORK (CAN)

54C-491

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

as shown in the illustration.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
(6) Connect intermediate connector C-29.
Q: Does the MUT-III screen correspond to the illustration?

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

go to Step 20 .

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

illustration, go to Step 5.

STEP 5. Check joint connector (3) C-02 and combination
meter connector C-101 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

.

Check the joint connector at the wiring harness side for loose,
corroded or damaged terminals, or terminals pushed back in
the connector, and also check the short pin behind the connec-
tor for corrosion, deformation and delamination.
Q: Is joint connector (3) C-02 in good condition?

YES : Go to Step 6.
NO : Repair the damaged parts. Replace the joint

connector as necessary.

AC306074

: Red section on screen

PCM

METER

-ECU

ABS-ECU

AB

MUT

ETACS

-ECU

AC-ECU

SRS-ECU

J/C

AC305232

HARNESS SIDE

C-101

CONNECTORS: C-02, C-101

AE

C-02

C-02

C-101

AC209350

1

12

2

13

3

14

4

15

5

16

6

17

7

18

8

19

9

20

10

21

11

22

AB

SHORT PIN