Infiniti QX56 (Z62). Manual - part 597

EC-366

< DTC/CIRCUIT DIAGNOSIS >

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P0524 ENGINE OIL PRESSURE

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Clean lubrication line.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

P0527 COOLING FAN SPEED SENSOR

EC-367

< DTC/CIRCUIT DIAGNOSIS >

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P0527 COOLING FAN SPEED SENSOR

DTC Logic

INFOID:0000000006217867

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine and warm it up to the normal operating temperature.

2.

Keep the engine speed approximately 1,000 rpm at no load.

3.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Proceed to 

EC-367, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006217868

1.

CHECK COOLING FAN SPEED SENSOR POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch OFF.

2.

Disconnect electrically-controlled cooling fan coupling harness connector.

3.

Turn ignition switch ON.

4.

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

Is inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 2.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0527

Cooling fan speed sen-
sor circuit range/perfor-
mance

The number of fan speed signals is 16 rpm or 
less during engine rev.

• Harness or connectors

(The Fuel rail pressure sensor circuit is 
open or shorted.)
(The Power steering pressure sensor cir-
cuit is open or shorted)
(The Electrically-controlled cooling fan 
coupling circuit is open or shorted)

• Fuel rail pressure sensor
• Power steering pressure sensor
• Cooling fan speed sensor
• Electrically-controlled cooling fan cou-

pling

• Cooling fan
• IPDM E/R

Electrically-controlled cooling fan coupling

Voltage

(Approx.)

Connector

+

−

terminal

F39

2

4

5 V

EC-368

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P0527 COOLING FAN SPEED SENSOR

2.

CHECK COOLING FAN SPEED SENSOR POWER SUPPLY CIRCUIT-II

1.

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

Is inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

CHECK SENSOR POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness connector for short to power and short to ground, between the following terminals.

Is inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit. Refer to 

EC-168, "Diagnosis Procedure"

.

NO

>> Repair or replace error-detected parts.

4.

CHECK COOLING FAN SPEED SENSOR GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between electrically-controlled cooling fan coupling harness connector and ECM har-
ness connector.

Is inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts.

5.

CHECK ECM GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between ECM harness connector and the ground.

+

−

Voltage

(Approx.)

Electrically-controlled cooling fan coupling

Connector

terminal

F39

2

Ground

5 V

ECM

Sensor

Connector

Terminal

Name

Connector

Terminal

F111

27

Low fuel pressure sensor

F25

3

Power steering pressure sensor

F35

1

Cooling fan speed sensor

F39

2

28

FRP sensor

F26

1

+

−

Continuity

Electrically-controlled cooling fan 

coupling

ECM

Connector

Terminal

Connector

Terminal

F39

4

F111

45

Existed

P0527 COOLING FAN SPEED SENSOR

EC-369

< DTC/CIRCUIT DIAGNOSIS >

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Is inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-40, "Intermittent Incident"

.

NO

>> Repair or replace error-detected parts.

6.

CHECK COOLING FAN SPEED SENSOR SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between electrically-controlled cooling fan coupling harness connector and ECM har-
ness connector.

4.

Also check harness for short to ground and to power.

Is inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace error-detected parts.

7.

CHECK COOLING FAN SPEED SENSOR

1.

Reconnect all harness connectors disconnected.

2.

Perform cooling fan speed sensor component inspection. Refer to 

EC-369, "Component Inspection (Cool-

ing Fan Speed Sensor)"

.

Is inspection result normal?

YES

>> GO TO 8.

NO

>> Replace electrically-controlled cooling fan coupling.

8.

CHECK COOLING FAN ROTATIONAL CONDITION

Rotate the cooling fan by hand.
Dose the cooling fan rotates smoothly?

YES

>> GO TO 9.

NO

>> Check that the cooling fan is not interfered with other parts.

9.

CHECK ELECTRICALLY-CONTROLLED COOLING FAN COUPLING SYSTEM

Refer to 

EC-495, "Diagnosis Procedure"

.

Is inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-40, "Intermittent Incident"

.

NO

>> Repair or replace error-detected parts.

Component Inspection (Cooling Fan Speed Sensor)

INFOID:0000000006217869

1.

CHECK COOLING FAN SPEED SENSOR

1.

Turn ignition switch OFF.

2.

Disconnect electrically-controlled cooling fan coupling harness connector.

3.

Rotate the electrically-controlled cooling fan coupling slowly with hand and check the voltage between
electrically-controlled cooling fan coupling connector terminals under the following conditions.

+

−

Continuity

ECM

Connector

Terminal

F111

10

Ground

Existed

E80

174

175

+

−

Continuity

Electrically-controlled cooling fan 

coupling

ECM

Connector

Terminal

Connector

Terminal

F39

5

F111

37

Existed