Mitsubishi Grandis. Manual — part 518

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-170

Q: Is the check result normal?

YES :

<1.0 V or less> Go to Step 53.

NO :

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

STEP 53. Voltage measurement at the A-16
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 engine-ECU <M/T> or

engine-A/T-ECU <A/T> connector 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-16 intermediate connector

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 20

"Diagnose CAN bus lines thoroughly." Refer
to

P.54D-526

.

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 54. Connector check: A-04 ASC-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 55 .

NO :

Repair the defective connector.

AC310398

AC

Connector: A-16 <RHD>

A-16 (B)

AC310628AW

Harness side

Connector: C-112 <RHD>

C-112 (GR)

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AC209365KO

Male side: A-16

Test
harness

AC310398

AJ

Connector: A-04 <RHD>

A-04

Harness side

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-171

STEP 55. 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

ASC-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)

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 20

"Diagnose CAN bus lines thoroughly." Refer
to

P.54D-526

.

NO :

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

STEP 56. 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

AC302572AD

Connector: A-07

Harness side

AC310398

AJ

Connector: A-04 <RHD>

A-04

Harness side

AC209365KM

Harness side: A-07

Test harness

AC302572AD

Connector: A-07

Harness side

AC310628AB

Connector: C-125 <RHD>

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-172

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 20

"Diagnose CAN bus lines thoroughly." Refer
to

P.54D-526

.

NO :

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

AC209365KP

Harness side: A-07

Test harness

DIAGNOSIS

CONTROLLER AREA NETWORK (CAN)

54D-173

Diagnostic Item 5: Diagnose the CAN bus lines for short to earth <LH drive vehicles without 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

ABS-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