Infiniti QX56 (Z62). Manual — part 886

LAN

ECM BRANCH LINE CIRCUIT

LAN-121

< DTC/CIRCUIT DIAGNOSIS >

[CAN SYSTEM (TYPE 1)]

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ECM BRANCH LINE CIRCUIT

Diagnosis Procedure

INFOID:0000000006256240

1.

CHECK CONNECTOR

1.

Turn the ignition switch OFF.

2.

Disconnect the battery cable from the negative terminal.

3.

Check the terminals and connectors of the ECM for damage, bend and loose connection (unit side and
connector side).

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair the terminal and connector.

2.

CHECK HARNESS FOR OPEN CIRCUIT

1.

Disconnect the connector of ECM.

2.

Check the resistance between the ECM harness connector terminals.

Is the measurement value within the specification?

YES

>> GO TO 3.

NO

>> Repair the ECM branch line.

3.

CHECK POWER SUPPLY AND GROUND CIRCUIT

Check the power supply and the ground circuit of the ECM. Refer to

EC-168, "Diagnosis Procedure"

.

Is the inspection result normal?

YES (Present error)>>Replace the ECM. Refer to

EC-535, "Removal and Installation"

.

YES (Past error)>>Error was detected in the ECM branch line.
NO

>> Repair the power supply and the ground circuit.

ECM harness connector

Resistance (

Ω

)

Connector No.

Terminal No.

E80

146

151

Approx. 108 – 132

LAN-122

< DTC/CIRCUIT DIAGNOSIS >

[CAN SYSTEM (TYPE 1)]

ABS BRANCH LINE CIRCUIT

ABS BRANCH LINE CIRCUIT

Diagnosis Procedure

INFOID:0000000006256242

1.

CHECK CONNECTOR

1.

Turn the ignition switch OFF.

2.

Disconnect the battery cable from the negative terminal.

3.

Check the terminals and connectors of the ABS actuator and electric unit (control unit) for damage, bend
and loose connection (unit side and connector side).

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair the terminal and connector.

2.

CHECK HARNESS FOR OPEN CIRCUIT

1.

Disconnect the connector of ABS actuator and electric unit (control unit).

2.

Check the resistance between the ABS actuator and electric unit (control unit) harness connector termi-
nals.

Is the measurement value within the specification?

YES

>> GO TO 3.

NO

>> Repair the ABS actuator and electric unit (control unit) branch line.

3.

CHECK POWER SUPPLY AND GROUND CIRCUIT

Check the power supply and the ground circuit of the ABS actuator and electric unit (control unit). Refer to

BRC-113, "Diagnosis Procedure"

.

Is the inspection result normal?

YES (Present error)>>Replace the ABS actuator and electric unit (control unit). Refer to

BRC-137, "Removal

and Installation"

.

YES (Past error)>>Error was detected in the ABS actuator and electric unit (control unit) branch line.
NO

>> Repair the power supply and the ground circuit.

ABS actuator and electric unit (control unit) harness connector

Resistance (

Ω

)

Connector No.

Terminal No.

E36

41

27

Approx. 54 – 66

LAN

TCM BRANCH LINE CIRCUIT

LAN-123

< DTC/CIRCUIT DIAGNOSIS >

[CAN SYSTEM (TYPE 1)]

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TCM BRANCH LINE CIRCUIT

Diagnosis Procedure

INFOID:0000000006256243

1.

CHECK CONNECTOR

1.

Turn the ignition switch OFF.

2.

Disconnect the battery cable from the negative terminal.

3.

Check the following terminals and connectors for damage, bend and loose connection (unit side and con-
nector side).

-

A/T assembly

-

Harness connector F1

-

Harness connector E7

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair the terminal and connector.

2.

CHECK HARNESS FOR OPEN CIRCUIT

1.

Disconnect the connector of A/T assembly.

2.

Check the resistance between the A/T assembly harness connector terminals.

Is the measurement value within the specification?

YES

>> GO TO 3.

NO

>> Repair the TCM branch line.

3.

CHECK HARNESS FOR OPEN CIRCUIT

1.

Remove the joint connector. Refer to

TM-182, "Removal and Installation"

.

2.

Check the continuity between the A/T assembly harness connector side and the TCM harness connector
side of the joint connector.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace the joint connector.

4.

CHECK POWER SUPPLY AND GROUND CIRCUIT

Check the power supply and the ground circuit of the TCM. Refer to

TM-151, "Diagnosis Procedure"

.

Is the inspection result normal?

YES (Present error)>>Replace the control valve & TCM. Refer to

TM-182, "Removal and Installation"

.

YES (Past error)>>Error was detected in the TCM branch line.
NO

>> Repair the power supply and the ground circuit.

A/T assembly harness connector

Resistance (

Ω

)

Connector No.

Terminal No.

F51

3

8

Approx. 54 – 66

A/T assembly harness connector side

TCM harness connector side

Continuity

Terminal No.

Terminal No.

3

3

Existed

8

8

Existed

LAN-124

< DTC/CIRCUIT DIAGNOSIS >

[CAN SYSTEM (TYPE 1)]

A-BAG BRANCH LINE CIRCUIT

A-BAG BRANCH LINE CIRCUIT

Diagnosis Procedure

INFOID:0000000006256244

WARNING:

• Before servicing, turn ignition switch OFF, disconnect battery negative terminal, and wait 3 minutes

or more. (To discharge backup capacitor.)

• Never use unspecified tester or other measuring device.

1.

CHECK CONNECTOR

1.

Turn the ignition switch OFF.

2.

Disconnect the battery cable from the negative terminal.

3.

Check the terminals and connectors of the air bag diagnosis sensor unit for damage, bend and loose con-
nection (unit side and connector side).

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace the main harness.

2.

CHECK AIR BAG DIAGNOSIS SENSOR UNIT

Check the air bag diagnosis sensor unit. Refer to

SRC-36, "Work Flow"

.

Is the inspection result normal?

YES

>> Replace the main harness.

NO

>> Replace parts whose air bag system has a malfunction.