Infiniti QX56 (Z62). Manual — part 629
EC-494
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
ELECTRICAL LOAD SIGNAL
>> INSPECTION END
3.
CHECK HEADLAMP SYSTEM
>> INSPECTION END
4.
CHECK HEATER FAN CONTROL SYSTEM
.
>> INSPECTION END
ELECTRICALLY-CONTROLLED COOLING FAN COUPLING
EC-495
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
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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
.
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
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
.
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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