Infiniti QX56 (JA60). Manual - part 668

LAN

MAIN LINE BETWEEN 4WD AND ABS CIRCUIT

LAN-71

< COMPONENT DIAGNOSIS >

[CAN]

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MAIN LINE BETWEEN 4WD AND ABS CIRCUIT

Diagnosis Procedure

INFOID:0000000005152915

1.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

1. Turn the ignition switch OFF.

2. Disconnect the battery cable from the negative terminal.

3. Disconnect the following harness connectors.

-

ECM

-

Transfer control unit

-

ABS actuator and electric unit (control unit)

4. Check the continuity between the transfer control unit harness connector and the ABS actuator and elec-

tric unit (control unit) harness connector.

Is the inspection result normal?

YES (Present error)>>Check the following items again.

• Decision of CAN system type.

• Not received CONSULT-III data [SELF-DIAG RESULTS, CAN DIAG SUPPORT MNTR (“ECU

list” included)].

• Procedure for detecting root cause.

YES (Past error)>>Error was detected in the main line between the transfer control unit and the ABS actuator

and electric unit (control unit).

NO

>> Repair the main line between the transfer control unit and the ABS actuator and electric unit (con-

trol unit).

Transfer control unit harness connector

ABS actuator and electric unit (control unit)

harness connector

Continuity

Connector No.

Terminal No.

Connector No.

Terminal No.

E142

7

E125

11

Existed

8

15

Existed

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< COMPONENT DIAGNOSIS >

[CAN]

ECM BRANCH LINE CIRCUIT

ECM BRANCH LINE CIRCUIT

Diagnosis Procedure

INFOID:0000000005146479

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).

-

ECM

-

Harness connector E5

-

Harness connector F14

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-82, "Diagnosis Procedure"

.

Is the inspection result normal?

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

EC-17, "Procedure After Replacing ECM"

.

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.

E16

94

86

Approx. 108 – 132

LAN

TCM BRANCH LINE CIRCUIT

LAN-73

< COMPONENT DIAGNOSIS >

[CAN]

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TCM BRANCH LINE CIRCUIT

Diagnosis Procedure

INFOID:0000000005152919

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 A/T assembly 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 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 control valve with TCM. Refer to 

TM-172, "Control Valve with TCM and A/T Fluid Tempera-

ture Sensor 2 and Plug"

.

2. Disconnect the connector of TCM.

3. Check the continuity between the A/T assembly connector and the TCM harness connector.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair the harness between the A/T assembly connector and the TCM harness connector.

4.

CHECK POWER SUPPLY AND GROUND CIRCUIT

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

TM-94, "Diagnosis Procedure"

.

Is the inspection result normal?

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

TM-172, "Control Valve with TCM and A/

T Fluid Temperature Sensor 2 and Plug"

.

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.

F9

3

8

Approx. 54 – 66

A/T assembly connector

TCM harness connector

Continuity

Terminal No.

Connector No.

Terminal No.

3

F502

1

Existed

8

2

Existed

LAN-74

< COMPONENT DIAGNOSIS >

[CAN]

LASER BRANCH LINE CIRCUIT

LASER BRANCH LINE CIRCUIT

Diagnosis Procedure

INFOID:0000000005146481

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 ICC sensor 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 ICC sensor.

2. Check the resistance between the ICC sensor harness connector terminals.

Is the measurement value within the specification?

YES

>> GO TO 3.

NO

>> Repair the ICC sensor branch line.

3.

CHECK POWER SUPPLY AND GROUND CIRCUIT

Check the power supply and the ground circuit of the ICC sensor. Refer to 

CCS-48, "Wiring Diagram"

.

Is the inspection result normal?

YES (Present error)>>Replace the ICC sensor. Refer to 

CCS-72, "ICC Sensor"

.

YES (Past error)>>Error was detected in the ICC sensor branch line.

NO

>> Repair the power supply and the ground circuit.

ICC sensor harness connector

Resistance (

Ω)

Connector No.

Terminal No.

E42

2

3

Approx. 54 – 66