Infiniti QX56 (Z62). Manual — part 597
EC-366
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P0524 ENGINE OIL PRESSURE
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Clean lubrication line.
8.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
>> INSPECTION END
P0527 COOLING FAN SPEED SENSOR
EC-367
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
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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
.
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
.
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 >
[VK56VD]
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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-
.
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
.
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
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