Mitsubishi Grandis. Manual - part 615

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-558

COMMENTS ON TROUBLE SYMPTOM

The CAN bus line wire or connectors may have 
loose, corroded, or damage terminals, or terminals 
pushed back in the connector.

POSSIBLE CAUSES

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

STEP 1. Connector check: C-09 joint connector 
(CAN2) and 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

.

When checking the joint connector, ensure that its 
wiring harness side is not damaged.

Q: Are the check results normal?

YES : 

Go to Step 2 .

NO : 

Repair a defective connector or replace the 
joint connector.

STEP 2. Resistance measurement at C-09 joint 
connector (CAN2) and C-125 intermediate 
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 

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 

AC310628AY

Connector: C-09 <RHD>

C-09 (GR)

Harness side

AC310628AB

Connector: C-125 <RHD>

AC209350

1

12

2

13

3

14

4

15

5

16

6

17

7

18

8

19

9

20

10

21

11

22

AC

Short pin

AC310628AY

Connector: C-09 <RHD>

C-09 (GR)

Harness side

AC310628AB

Connector: C-125 <RHD>

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-559

disconnected.

(4) Continuity between C-125 intermediate 

connector terminal No.26 and C-09 joint 
connector (CAN2) terminal No.11

OK: 2 

Ω or less

(5) Continuity between C-125 intermediate 

connector terminal No.27 and C-09 joint 
connector (CAN2) terminal No.22

OK: 2 

Ω 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 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 (CAN2) and the 
intermediate connector.

STEP 3. Connector check: 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

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 4 .

NO : 

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

AC312553

AC312553 AN

Harness side: C-09

Test
harness

Female side: C-125

Test harness

AC312553

AC312553 AP

Harness side: C-09

Test
harness

Female side: C-125

Test harness

AC302572AD

Connector: A-07

Harness side

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-560

STEP 4. Resistance measurement at C-125 
intermediate connector and 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) Continuity between A-07 joint connector (CAN1) 

terminal No.1 and C-125 intermediate connector 
terminal No.27

OK: 2 

Ω or less

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

terminal No.4 and C-125 intermediate connector 

AC302572AD

Connector: A-07

Harness side

AC310628AB

Connector: C-125 <RHD>

AC312553

Male side: C-125

Test harness

 AV

Harness side: A-07

Test
harness

AC312553 AU

Male side: C-125

Test harness

Harness side: A-07

Test
harness

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-561

terminal No.26

OK: 2 

Ω 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> 

Follow diagnostic item 23 "Diagnose the 
lines from the main bus line to the 
engine-ECU <M/T> or engine-A/T-ECU 
<A/T>" (Refer to 

P.54D-562

), diagnostic 

item 24 "Diagnose the lines between CAN 
main bus line and the ABS-ECU (Refer to 

P.54D-567

), or diagnostic item 25 

"Diagnose the lines between CAN main bus 
line and the ASC-ECU" (Refer to 

P.54D-571

).

NO : 

<Either or all of the resistances measure 
more than 2 

Ω> Repair the wiring harness 

between joint connector (CAN1) and the 
intermediate connector.