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 

PCS-11, "Diagnosis

Description"

.

2.

Make sure that cooling fan operates.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-481, "Diagnosis Procedure"

.

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

Refer to 

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

Refer to 

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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