Infiniti QX56 (Z62). Manual - part 629

 

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Infiniti QX56 (Z62). Manual - part 629

 

 

EC-494

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

ELECTRICAL LOAD SIGNAL

>> INSPECTION END

3.

CHECK HEADLAMP SYSTEM

Refer to 

EXL-59, "Work Flow"

.

>> INSPECTION END

4.

CHECK HEATER FAN CONTROL SYSTEM

Refer to 

HAC-60, "Work Flow"

.

>> INSPECTION END

ELECTRICALLY-CONTROLLED COOLING FAN COUPLING

EC-495

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

C

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ELECTRICALLY-CONTROLLED COOLING FAN COUPLING

Component Function Check

INFOID:0000000006217997

1.

CHECK COOLING FAN FUNCTION

 WITH CONSULT-III

1.

Start the engine.

2.

Perform “FAN DUTY CONTROL” in “ACTIVE TEST” mode with CONSULT-III.

3.

Check that cooling fan speed varies according to the percentage.
NOTE:
Speed changes gradually as the percentage changes.

 WITHOUT CONSULT-III

1.

Start the engine and warm up the engine until engine coolant temperature reaches at least 98

°

C (209

°

F).

2.

Check that cooling fan speed increase.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-495, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000006217998

1.

CHECK DRIVE BELT

1.

Turn ignition switch OFF.

2.

Check that the drive belt is not broken.

Is inspection result normal?

YES

>> GO TO 2.

NO

>> Replace drive belt.

2.

CHECK ELECTRICALLY-CONTROLLED COOLING FAN COUPLING POWER SUPPLY

1.

Disconnect electrically-controlled cooling fan coupling harness connector.

2.

Turn ignition switch ON.

3.

Check the voltage between electrically-controlled cooling fan coupling harness connector and ground.

Is inspection result normal?

YES

>> GO TO 3.

NO

>> Perform trouble diagnosis for power supply circuit.

3.

CHECK ELECTRICALLY-CONTROLLED COOLING FAN COUPLING GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check the continuity between electrically-controlled cooling fan coupling harness connector and ground.

Is inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK ELECTRICALLY-CONTROLLED COOLING FAN COUPLING CONTROL SIGNAL

WITH CONSULT-III

+

Voltage

(Approx.)

Electrically-controlled cooling fan coupling

Connector

Terminal

F39

1

Ground

Battery voltage

+

Continuity

Electrically-controlled cooling fan coupling

Connector

Terminal

F39

6

Ground

Existed

EC-496

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

ELECTRICALLY-CONTROLLED COOLING FAN COUPLING

1.

Start the engine.

2.

Perform “FAN DUTY CONTROL” in “ACTIVE TEST” mode of “ECM” with CONSULT-III.

3.

Set the Duty value to 100%.

4.

Check the voltage between electrically-controlled cooling fan coupling harness connector and ground.

CAUTION:

Wait for 1 minute or more to measure.

WITHOUT CONSULT-III

1.

Start the engine and warm up the engine until engine coolant temperature reaches at least 98

°

C (209

°

F).

2.

Check the voltage between electrically-controlled cooling fan coupling harness connector and ground.

CAUTION:

Wait for 1 minute or more to measure.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 5.

5.

CHECK ELECTRICALLY-CONTROLLED COOLING FAN COUPLING CONTROL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R harness connector.

3.

Check the continuity between electrically-controlled cooling fan coupling harness connector and IPDM E/
R harness connector. 

4.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 6.

+

Voltage

(Approx.)

Electrically-controlled cooling fan coupling

Connector

Terminal

F39

3

Ground

2. 5 V

+

Voltage

(Approx.)

Electrically-controlled cooling fan coupling

Connector

Terminal

F39

3

Ground

2. 5 V

JMMIA0404GB

JMMIA0404GB

+

Continuity

Electrically-controlled cooling fan 

coupling

IPDM E/R

Connector

Terminal

Connector

Terminal

F39

3

E17

72

Existed

ELECTRICALLY-CONTROLLED COOLING FAN COUPLING

EC-497

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

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NO

>> Repair or replace error-detected parts.

6.

CHECK CAN COMMUNICATION

Refer to 

LAN-18, "Trouble Diagnosis Flow Chart"

.

Is inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-40, "Intermittent Incident"

.

NO

>> Repair or Replace error-detected parts.

7.

CHECK COOLING FAN SPEED SENSOR

Refer to 

EC-367, "Diagnosis Procedure"

.

Is inspection result normal?

YES

>> Replace electrically-controlled cooling fan coupling. Refer to 

CO-16, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

 

 

 

 

 

 

 

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