Mitsubishi Grandis. Manual - part 510

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-138

terminal No.6 and body earth

OK: Less than 1.0 V

(4) Disconnect the negative battery terminal.

CAUTION

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

P.54D-8

.

Q: Is the check result normal?

YES : 

<less than 1.0 V> Follow diagnostic item 19 

"Diagnose CAN bus lines thoroughly." Refer 
to 

P.54D-502

.

NO : 

<1.0 V or more> Repair the wiring harness 
between the intermediate connector and the 
engine-ECU <M/T> or engine-A/T-ECU 
<A/T> connector.

STEP 50. Connector check: A-03 ABS-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

.

Q: Is the check result normal?

YES : 

Go to Step 51 .

NO : 

Repair the defective connector.

STEP 51. Voltage 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 

ABS-ECU connector, and measure at the wiring 
harness side.

(2) Connect the negative battery terminal, and turn 

the ignition switch to the ON position.

(3) Voltage between A-07 joint connector (CAN1) 

AC310398

AI

Connector: A-03 <RHD>

Harness side

AC302572AD

Connector: A-07

Harness side

AC310398

AI

Connector: A-03 <RHD>

Harness side

AC209365KM

Harness side: A-07

Test harness

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-139

terminal No.5 and body earth

OK: Less than 1.0 V

(4) Disconnect the negative battery terminal.

CAUTION

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

P.54D-8

.

Q: Is the check result normal?

YES : 

<less than 1.0 V> Follow diagnostic item 19 

"Diagnose CAN bus lines thoroughly." Refer 
to 

P.54D-502

.

NO : 

<1.0 V or more> Repair the wiring harness 
between the joint connector (CAN1) and the 
ABS-ECU connector.

STEP 52. Voltage 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) Connect the negative battery terminal, and turn 

the ignition switch to the ON position.

(3) Voltage between A-07 joint connector (CAN1) 

terminal No.4 and body earth

OK: Less than 1.0 V

(4) Disconnect the negative battery terminal.

CAUTION

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

P.54D-8

.

Q: Is the check result normal?

YES : 

<less than 1.0 V> Follow diagnostic item 19 

"Diagnose CAN bus lines thoroughly." Refer 
to 

P.54D-502

.

NO : 

<1.0 V or more> Repair the wiring harness 
between the joint connector (CAN1) and the 
intermediate connector.

AC302572AD

Connector: A-07

Harness side

AC310628AB

Connector: C-125 <RHD>

AC209365KP

Harness side: A-07

Test harness

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-140

Diagnostic Item 4: Diagnose the CAN bus lines for short to power supply <RH 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-141

TROUBLE JUDGMENT

Short to power supply may be present when the 
voltage between the CAN bus line (CAN_L or 
CAN_H) and body earth is more than 4.0 V. In this 
condition, an abnormal voltage may be measured at 
CAN_L and CAN_H lines.

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.

POSSIBLE CAUSES

• 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>

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