Infiniti G37 Coupe. Manual — part 575
COOLING FAN
EC-481
< COMPONENT DIAGNOSIS >
[VQ37VHR]
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COOLING FAN
Description
INFOID:0000000001734305
COOLING FAN CONTROL MODULE
Cooling fan control module receives ON/OFF pulse duty signal from IPDM E/R. Corresponding to this ON/OFF
pulse duty signal, cooling fan control module sends cooling fan motor operating voltage to cooling fan motor.
The revolution speed of cooling fan motor is controlled by duty cycle of the voltage.
COOLING FAN MOTOR
Cooling fan motor receives cooling fan motor operating voltage from cooling fan control module. The revolu-
tion speed of cooling fan motor is controlled by duty cycle of the voltage.
Component Function Check
INFOID:0000000001734306
1.
CHECK COOLING FAN FUNCTION
With CONSULT-III
1.
Turn ignition switch ON.
2.
Perform “FAN DUTY CONTROL” in “ACTIVE TEST” mode with CONSULT-III.
3.
Make sure that cooling fan speed varies according to the percent.
Without CONSULT-III
1.
Perform IPDM E/R auto active test and check cooling fan motors operation, refer to
.
2.
Make sure that cooling fan operates.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000001734307
1.
CHECK COOLING FAN CONTROL MODULE POWER SUPPLY CIRCUIT-I
1.
Turn ignition switch OFF.
2.
Disconnect cooling fan control module harness connector E37.
3.
Turn ignition switch ON.
4.
Check the voltage between cooling fan control module harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 7.
2.
CHECK COOLING FAN CONTROL MODULE GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Check the continuity between cooling fan control module harness connector and ground.
3.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair open circuit or short to power in harness or connectors.
Cooling fan control module
Ground
Voltage
Connector
Terminal
E37
3
Ground
Battery voltage
Cooling fan control module
Ground
Continuity
Connector
Terminal
E37
1
Ground
Existed
EC-482
< COMPONENT DIAGNOSIS >
[VQ37VHR]
COOLING FAN
3.
CHECK IPDM E/R GROUND CIRCUIT
1.
Disconnect IPDM E/R harness connectors E5, E6.
2.
Check the continuity between IPDM E/R harness connector and ground.
3.
Also check harness for short to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair open circuit or short to power in harness or connectors.
4.
CHECK COOLING FAN CONTROL SIGNAL CIRCUIT
1.
Disconnect IPDM E/R harness connector E9.
2.
Check the continuity between IPDM E/R harness connector and cooling fan control module harness con-
nector.
3.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK COOLING FAN CONTROL MODULE OUTPUT SIGNAL CIRCUIT
1.
Reconnect all harness connectors disconnected.
2.
Disconnect cooling fan control module harness connectors E301, E302.
3.
Turn ignition switch ON.
4.
Check the voltage between cooling fan control module harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Replace cooling fan control module.
6.
CHECK COOLING FAN MOTORS -1 AND -2
EC-483, "Component Inspection (Cooling Fan Motor)"
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Replace cooling fan motor.
7.
CHECK COOLING FAN CONTROL MODULE POWER SUPPLY CIRCUIT-II
1.
Turn ignition switch OFF.
2.
Disconnect cooling fan relay harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between cooling fan relay harness connector and ground.
IPDM E/R
Ground
Continuity
Connector
Terminal
E5
12
Ground
Existed
E6
41
IPDM E/R
Cooling fan control module
Continuity
Connector
Terminal
Connector
Terminal
E9
97
E37
2
Existed
Cooling fan control module
Ground
Voltage
Connector
Terminal
E301
4
Ground
Battery voltage
E302
6
COOLING FAN
EC-483
< COMPONENT DIAGNOSIS >
[VQ37VHR]
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Is the inspection result normal?
YES
>> GO TO 9.
NO
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
• 10A fuse (No. 42)
• IPDM E/R harness connector E7
• 50A fusible link (letter F)
• Harness for open or short between cooling fan relay and fuse
• Harness for open or short between cooling fan relay and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.
CHECK COOLING FAN CONTROL MODULE POWER SUPPLY CIRCUIT-III
1.
Turn ignition switch OFF.
2.
Disconnect IPDM E/R harness connector E6.
3.
Check the continuity between cooling fan relay harness connector and IPDM E/R harness connector.
4.
Check the continuity between cooling fan relay harness connector and cooling fan control module harness
connector.
5.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
10.
CHECK COOLING FAN RELAY
EC-484, "Component Inspection (Cooling Fan Relay)"
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Replace cooling fan relay.
11.
CHECK INTERMITTENT INCIDENT
Perform
GI-38, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace IPDM E/R.
NO
>> Repair or replace harness connectors.
Component Inspection (Cooling Fan Motor)
INFOID:0000000001734308
1.
CHECK COOLING FAN MOTOR
1.
Turn ignition switch OFF.
Cooling fan relay
Ground
Voltage
Connector
Terminal
E17
1
Ground
Battery voltage
3
Cooling fan relay
IPDM E/R
Continuity
Connector
Terminal
Connector
Terminal
E17
2
E6
42
Existed
Cooling fan relay
Cooling fan control module
Continuity
Connector
Terminal
Connector
Terminal
E17
5
E37
3
Existed
EC-484
< COMPONENT DIAGNOSIS >
[VQ37VHR]
COOLING FAN
2.
Disconnect cooling fan control module harness connectors E301, E302.
3.
Supply cooling fan control module terminals with battery voltage and check operation.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace cooling fan motor.
Component Inspection (Cooling Fan Relay)
INFOID:0000000001734309
1.
CHECK COOLING FAN RELAY
1.
Turn ignition switch OFF.
2.
Remove cooling fan relay.
3.
Check the continuity between cooling fan relay terminals under
the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace cooling fan relay.
Cooling fan control module
Operation
Motor
Connector
Terminal
(+)
(–)
1
E301
4
5
Cooling fan operates.
2
E302
6
7
Terminals
Conditions
Continuity
3 and 5
12V direct current supply between terminals 1 and 2
Existed
No current supply
Not existed
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