Mitsubishi Grandis. Manual - part 616

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-562

Diagnostic Item 23: Diagnose the lines from the main bus line to the engine-ECU <M/T> or 
engine-A/T-ECU <A/T>.

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.

TROUBLE JUDGMENT

If the MUT-III cannot receive any signal from the 
engine-ECU <M/T> or engine-A/T-ECU <A/T>, CAN 
bus line connector(s) are broken or an open circuit 
has occurred.

COMMENTS ON TROUBLE SYMPTOM

Connector(s), wiring harness in the CAN bus lines, 
the engine-ECU <M/T> or engine-A/T-ECU <A/T> 
may be defective.

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-563

POSSIBLE CAUSES

• Damaged harness wires and connectors

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

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

DIAGNOSTIC PROCEDURE

STEP 1. Connector check: A-07 joint connector 
(CAN1) and A-16 intermediate connector
NOTE: When checking A-07 joint connector (CAN1), 
disassemble and check the engine compartment 
relay box by referring to 

P.54D-616

.

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 is 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-16 intermediate 
connector.
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.

AC302572AD

Connector: A-07

Harness side

AC310403

AC

Connector: A-16 <LHD>

A-16 (B)

AC310398

AC

Connector: A-16 <RHD>

A-16 (B)

AC302572AD

Connector: A-07

Harness side

AC310403

AC

Connector: A-16 <LHD>

A-16 (B)

AC310398

AC

Connector: A-16 <RHD>

A-16 (B)

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-564

(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.3 and A-16 intermediate connector 

terminal No.12

OK: 2 

Ω or less

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

terminal No.6 and A-16 intermediate connector 
terminal No.6

OK: 2 

Ω or less

CAUTION

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

P.54D-8

.

Q: Is the check result normal?

YES : 

<All the voltages measure 2 

Ω or less> Go 

to Step 3   .

NO : 

<Either or all of the resistances measure 
more than 2 

Ω> Repair the wiring harness 

between joint connector (CAN1) and the 
intermediate connector.

AC312553

AC312553

Test harness

AQ

Harness side: A-07

Female side: A-16

Test
harness

AC312553

AC312553 AR

Harness side: A-07

Female side: A-16

Test
harness

Test
harness

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-565

STEP 3. Connector check: C-112 engine-ECU 
<M/T> or engine-A/T-ECU <A/T> 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 A-07 
intermediate connector and C-112 engine-ECU 
<M/T> or engine-A/T-ECU <A/T> 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 engine-ECU <M/T> or 

engine-A/T-ECU <A/T> connector 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 

AC310615

AS

Harness side

Connector: C-112 <LHD>

C-112 (GR)

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AC310628AW

Harness side

Connector: C-112 <RHD>

C-112 (GR)

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AC302572AD

Connector: A-07

Harness side

AC310615

AS

Harness side

Connector: C-112 <LHD>

C-112 (GR)

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AC310628AW

Harness side

Connector: C-112 <RHD>

C-112 (GR)

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