Mitsubishi Grandis. Manual - part 557

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-326

disconnected.

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

terminal Nos. 2 and 5

OK: More than 2 

Ω

CAUTION

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

P.54D-8

.

Q: Is the check result normal?

YES : 

<More than 2 

Ω> Go to Step 36.

NO : 

<2 

Ω or less> Repair the wiring harness 

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

STEP 36. Resistance measurement at A-03 
ABS-ECU connector.

CAUTION

A digital multimeter should be used. For details 
refer to 

P.54D-8

.

(1) Connect special tool MB991974 to the ABS-ECU 

connector, and measure by using the check 
connector (connect the ECU side only).

(2) Resistance between special tool MB991974 

AC204740

AC204740

AC204740

AC204740

AC204740

AC204740

AC204740DL

Harness side: A-07

Test
harness

Test
harness

AC310401

Connector: A-03 <LHD>

Harness side

AK

AC304012

MB991974

AB

ABS-ECU

Check connector

AC204740

1

3

4

5

6

7

8

9

10

11

2

13 12

16

17

18

19

20

21

22

23

24

15

25

14

26

AC204740

AC204740

AC204740

AC204740BD

Special tool MB991974: 
Check connector

Check 
harness

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-327

check connector terminal Nos. 21 and 23.

OK: 1 k

Ω or more

Q: Is the check result normal?

YES : 

<1 k

Ω or more> Follow diagnostic item 17, 

Diagnose CAN bus lines thoroughly. Refer 
to 

P.54D-452

.

NO : 

<Less than 1 k

Ω> Replace the ABS-ECU.

STEP 37. Resistance measurement at the A-07 
joint connector (CAN1).
NOTE: When checking A-07 joint connector (CAN1), 
disassemble and check the engine compartment 
relay box by referring to 

P.54D-616

.

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 

intermediate 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) Measure the continuity between A-07 joint 

connector (CAN1) terminal Nos. 1 and 4.

OK: More than 2 

Ω

CAUTION

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

P.54D-8

.

Q: Is the check result normal?

YES : 

<2 more than 

Ω> Follow diagnostic item 17, 

Diagnose CAN bus lines thoroughly. Refer 
to 

P.54D-452

.

NO : 

<2 

Ω or less> Repair the wiring harness 

between joint connector (CAN1) and the 
intermediate connector.

AC302572AD

Connector: A-07

Harness side

AC310613

AD

Connector: C-125 <LHD>

AC204740

AC204740

AC204740

AC204740

AC204740

AC204740

AC204740DN

Harness side: A-07

Test
harness

Test
harness

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-328

Diagnostic Item 10: Diagnose the lines between CAN_L and CAN_H for short circuit <LH drive 
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.

A/C-ECU

CENTER DISPLAY

COMBINATION
METER

DIAGNOSIS
CONNECTOR

ASC-ECU

ENGINE-ECU<M/T>
ENGINE·A/T-ECU<A/T>

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-329

TROUBLE JUDGMENT

Short circuit may be present between the CAN_L 
and H lines when the resistance between the CAN 
bus lines (CAN_L and H lines) is less than 2 

Ω.

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 a ECU may be 
defective.

TROUBLESHOOTING HINTS

• Damaged harness wires and connectors

• Malfunction of the ETACS-ECU

• Malfunction of the combination meter

• Malfunction of the A/C-ECU

• Malfunction of the SRS-ECU

• Malfunction of the multi-centre display

• Malfunction of the steering wheel angle sensor

• Malfunction of the ASC-ECU

• Malfunction of the engine-ECU <M/T> or 

engine-A/T-ECU <A/T>

DIAGNOSTIC PROCEDURE

STEP 1. Connector check: C-125 intermediate 
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 2.

NO : 

Repair the defective connector.

ETACS-ECU

STEERING WHEEL
ANGLE SENSOR

SRS-ECU

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

AC310613

AD

Connector: C-125 <LHD>