Mitsubishi Grandis. Manual — part 621

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-582

TROUBLE JUDGMENT

If the MUT-III can not received signals from the
centre display, CAN bus line connector(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 centre display
may be defective.

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of the centre display

DIAGNOSTIC PROCEDURE

STEP 1. Connector check: C-09 joint connector
(CAN2) connector and C-37 jumper connector

CAUTION

The strand end of the twist wire should be within
10 cm from the connector. For details refer to

P.54D-8

.

When checking the joint connector, ensure that its
wiring harness side and its short pins are not
damaged, and check that the wiring harness of the
jumper connector is not damaged.

Q: Is the check result normal?

YES :

Go to Step 2 .

NO :

Repair a defective connector or replace the
joint connector.

AC310615

AU

Harness side

Connector: C-09 <LHD>

C-09 (GR)

AC310615

AV

Connector: C-37 <LHD>

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

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-583

STEP 2. Resistance measurement at the C-09
joint connector (CAN2) connector and C-37
jumper connector.

CAUTION

A digital multimeter should be used. For details
refer to

P.54D-8

.

CAUTION

The test wiring harness should be used. For
details refer to

P.54D-8

.

(1) Disconnect the joint connector (CAN2) and the

jumper connector, and measure at the wiring
harness side.

(2) Ignition switch: OFF (LOCK)

CAUTION

When measuring the resistance, disconnect the
negative battery terminal. For details refer to

P.54D-8

.

(3) Ensure that the negative battery terminal is

disconnected.

(4) Continuity between C-09 joint connector (CAN2)

terminal No.5 and C-37 jumper connector
terminal No.5

OK: 2 ohms or less

(5) Continuity between C-09 joint connector (CAN2)

terminal No.16 and C-37 jumper connector

AC310615

AU

Harness side

Connector: C-09 <LHD>

C-09 (GR)

AC310615

AV

Connector: C-37 <LHD>

AC312553

Harness side: C-09

Test
harness

Test
harness

Harness side: C-37

BJ

AC312553BI

Harness side: C-09

Test
harness

Test
harness

Harness side: C-37

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-584

terminal No.2

OK: 2 ohms or less

CAUTION

Strictly observe the specified wiring harness
repair procedure. For details refer to

P.54D-8

.

Q: Are the check result normal?

YES :

<All the resistances measure 2

Ω or less>

Go to Step 3 .

NO :

<Either or all of the voltages measure more
than 2

Ω> Repair the wiring harness

between the joint connector (CAN2) and the
jumper connector.

STEP 3. Connector check: C-07 centre display
connector

CAUTION

The strand end of the twist wire should be within
10 cm from the connector. For details refer to

P.54D-8

.

Q: Is the check result normal?

YES :

Go to Step 4 .

NO :

Repair a defective connector or replace the
joint connector.

STEP 4. Resistance measurement at the C-37
jumper connector and C-07 centre display
connector.

CAUTION

A digital multimeter should be used. For details
refer to

P.54D-8

.

CAUTION

The test wiring harness should be used. For
details refer to

P.54D-8

.

(1) Disconnect the jumper connector and the centre

display connector, and measure at the wiring
harness side.

(2) Ignition switch: OFF (LOCK)

CAUTION

When measuring the resistance, disconnect the
negative battery terminal. For details refer to

P.54D-8

.

(3) Ensure that the negative battery terminal is

AC310613

BC

Connector: C-07 <LHD>

Harness side

C-07 (B)

AC310613

BC

Connector: C-07 <LHD>

Harness side

C-07 (B)

AC310615

AV

Connector: C-37 <LHD>

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-585

disconnected.

(4) Continuity between C-37 jumper connector

terminal No.4 and C-07 centre display connector

terminal No.5

OK: 2 ohms or less

(5) Continuity between C-37 jumper connector

terminal No.3 and C-07 centre display connector
terminal No.15

OK: 2 ohms or less

CAUTION

Strictly observe the specified wiring harness
repair procedure. For details refer to

P.54D-8

.

Q: Are the check result normal?

YES :

<All the resistances measure 2

Ω or less>

Power supply to the centre display
connector may be suspected. Diagnose the
centre display. Refer to

P.54A-161

.

NO :

<Either or all of the voltages measure more
than 2

Ω> Repair the wiring harness

between the jumper connector and the
centre display connector.

AC312553

Test
harness

Harness side: C-07

Test
harness

Harness side: C-37

BM

AC312553

Harness side: C-07

Test
harness

Test
harness

Harness side: C-37

BN