Mitsubishi Grandis. Manual — part 618

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-570

(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 A-07 joint connector (CAN1)

terminal No.2 and A-03 ABS-ECU connector

terminal No.21

OK: 2 ohms or less

(5) Continuity between A-07 joint connector (CAN1)

terminal No.5 and A-03 ABS-ECU connector
terminal No.23

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 results normal?

YES :

<All the resistances measure 2

Ω or less>

Power supply to the ABS-ECU may be
suspected. Diagnose the ABS system.
Refer to

P.35B-65

.

NO :

<Either or all of the resistances measure
more than 2

Ω> Repair the wiring harness

between the joint connector (CAN1) and the
ABS-ECU connector.

AC312553

Harness side: A-07

Test
harness

Harness side: A-03

Test
harness

BW

AC312553

Harness side: A-07

Test
harness

BY

Harness side: A-03

Test
harness

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-571

Diagnostic Item 25: Diagnose the lines between CAN main bus line and the ASC-ECU <Vehicles with
ASC>

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.

ASC-ECU

ENGINE-ECU<M/T>
ENGINE·A/T-ECU<A/T>

COMBINATION
METER

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-572

TROUBLE JUDGMENT

If the MUT-III can not received signal from the
ASC-ECU, 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 ASC-ECU may
be defective.

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of the ASC-ECU

ASC-ECU

ENGINE-ECU<M/T>
ENGINE·A/T-ECU<A/T>

COMBINATION
METER

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-573

DIAGNOSTIC PROCEDURE

STEP 1. Connector check: A-07 joint connector
(CAN1) connector and A-04 ASC-ECU 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.

Q: Is the check result normal?

YES :

Go to Step 2 .

NO :

Repair a defective connector or replace the
joint connector (front wiring harness
assembly).

STEP 2. Resistance measurement at A-07 joint
connector (CAN1) and A-04 ASC-ECU 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 (CAN1) and the

ASC-ECU connector, and measure at the wiring
harness side.

AC302572AD

Connector: A-07

Harness side

AC310401

Connector: A-04 <LHD>

Harness side

AL

A-04

AC310398

AJ

Connector: A-04 <RHD>

A-04

Harness side

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

AC302572AD

Connector: A-07

Harness side

AC310401

Connector: A-04 <LHD>

Harness side

AL

A-04

AC310398

AJ

Connector: A-04 <RHD>

A-04

Harness side