Mitsubishi Grandis. Manual — part 622

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-586

Diagnostic Item 29: Diagnose the lines from the main bus line to the centre display <RH drive
vehicles>

CAUTION

When servicing a CAN bus line, earth yourself by
touching a metal object such as an unpainted
water pipe. If you fail to do, a component
connected to the CAN bus line may be broken.

ENGINE-ECU<M/T>
ENGINE·A/T-ECU<A/T>

COMBINATION
METER

CENTER
DISPLAY

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Gray R : Red P : Pink V : Violet

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-587

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.

AC310628AY

Connector: C-09 <RHD>

C-09 (GR)

Harness side

AC310628AZ

Connector: C-37 <RHD>

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-588

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

OK: 2 ohms or less

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

terminal No.20 and C-37 jumper connector

AC310628AY

Connector: C-09 <RHD>

C-09 (GR)

Harness side

AC310628AZ

Connector: C-37 <RHD>

AC312553 BL

Test
harness

Harness side: C-37

Harness side: C-09

Test
harness

AC312553BK

Harness side: C-09

Test
harness

Test
harness

Harness side: C-37

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-589

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

AC310631AY

Connector: C-07 <RHD>

Harness side

C-07 (B)

AC310631AY

Connector: C-07 <RHD>

Harness side

C-07 (B)

AC310628AZ

Connector: C-37 <RHD>