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