Mitsubishi Grandis. Manual — part 625

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-598

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of the A/C-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Connector check: C-09 joint connector
(CAN2) connector and C-106 A/C-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: Are the check result 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-106 A/C-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 (CAN2) and the

A/C-ECU 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

AU

Harness side

Connector: C-09 <LHD>

C-09 (GR)

AC310613

AB

Connector: C-106 <LHD>

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

AC310615

AU

Harness side

Connector: C-09 <LHD>

C-09 (GR)

AC310613

AB

Connector: C-106 <LHD>

Harness side

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-599

disconnected.

(4) Continuity between C-09 joint connector (CAN2)

terminal No.2 and C-106 A/C-ECU connector

terminal No.8

OK: 2 ohms or less

(5) Continuity between C-09 joint connector (CAN2)

terminal No.13 and C-106 A/C-ECU connector
terminal No.9

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 result normal?

YES :

<All the resistances measure 2

Ω or less>

Power supply to the A/C-ECU may be
suspected. Diagnose the air conditioner
system. Refer to

P.55-174

.

NO :

<Either or all of the voltages measure more
than 2

Ω> Repair the wiring harness

between the joint connector (CAN2) and the
A/C-ECU connector.

AC312553

Harness side: C-106

Test
harness

BA

Harness side: C-09

Test
harness

AC312553

Harness side: C-106

Test
harness

BC

Harness side: C-09

Test
harness

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-600

Diagnostic Item 33: Diagnose the lines from the main bus line to the A/C-ECU <RH drive vehicles>

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 can not received signals from the
A/C-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 A/C-ECU may
be defective.

ENGINE-ECU<M/T>
ENGINE·A/T-ECU<A/T>

COMBINATION
METER

A/C-
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

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-601

POSSIBLE CAUSES

• Damaged harness wires and connectors

• Malfunction of the A/C-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Connector check: C-09 joint connector
(CAN2) connector and C-106 A/C-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: Are the check result 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-106 A/C-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 (CAN2) and the

A/C-ECU 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

AC310631AB

Connectors: C-106 <RHD>

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

AC310628AY

Connector: C-09 <RHD>

C-09 (GR)

Harness side

AC310631AB

Connectors: C-106 <RHD>

Harness side