Infiniti FX35, FX50 (S51). Manual - part 731

COOLING FAN

EC-465

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

C

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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 1 harness
connector.

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, short to ground or short to power in harness or connectors.

5.

CHECK COOLING FAN CONTROL MODULE 1 OUTPUT SIGNAL CIRCUIT

1.

Reconnect all harness connectors disconnected.

2.

Disconnect cooling fan control module 1 harness connectors E301, E302.

3.

Turn ignition switch ON.

4.

Check the voltage between cooling fan control module 1 terminals and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace cooling fan control module 1.

6.

CHECK COOLING FAN MOTORS -1 AND -2

Refer to 

EC-466, "Component Inspection (Cooling Fan Motor)"

.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Replace malfunctioning cooling fan motor.

7.

CHECK COOLING FAN CONTROL MODULE 1 POWER SUPPLY CIRCUIT-II

1.

Turn ignition switch OFF.

2.

Disconnect cooling fan relay 1.

3.

Turn ignition switch ON.

4.

Check the voltage between cooling fan relay 1 harness connector and ground.

IPDM E/R

Ground

Continuity

Connector

Terminal

E5

12

Ground

Existed

E6

41

IPDM E/R

Cooling fan control module 1

Continuity

Connector

Terminal

Connector

Terminal

E9

97

E37

2

Existed

Cooling fan control module 1

Ground

Voltage

Terminal

4

Ground

Battery voltage

6

EC-466

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

COOLING FAN

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 8.

8.

DETECT MALFUNCTIONING PART

Check the following.
• 10 A fuse (No. 42)
• IPDM E/R harness connector E7
• 50 A fusible link (letter O)
• Harness for open or short between cooling fan relay 1 and fuse
• Harness for open or short between cooling fan relay 1 and battery

>> Repair open circuit, short to ground or short to power in harness or connectors.

9.

CHECK COOLING FAN CONTROL MODULE 1 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 1 harness connector and IPDM E/R harness connector.

4.

Check the continuity between cooling fan relay 1 harness connector and cooling fan control module 1 har-
ness 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, short to ground or short to power in harness or connectors.

10.

CHECK COOLING FAN RELAY 1

Refer to 

EC-467, "Component Inspection (Cooling Fan Relay)"

.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Replace cooling fan relay 1.

11.

CHECK INTERMITTENT INCIDENT

Perform 

GI-36, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace IPDM E/R.

NO

>> Repair or replace harness connectors.

Component Inspection (Cooling Fan Motor)

INFOID:0000000005237079

1.

CHECK COOLING FAN MOTOR

1.

Turn ignition switch OFF.

Cooling fan relay 1

Ground

Voltage

Connector

Terminal

E15

2

Ground

Battery voltage

3

Cooling fan relay 1

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

E15

1

E6

42

Existed

Cooling fan relay 1

Cooling fan control module 1

Continuity

Connector

Terminal

Connector

Terminal

E15

5

E37

3

Existed

COOLING FAN

EC-467

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

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2.

Disconnect cooling fan control module 1 harness connectors E301, E302.

3.

Supply cooling fan control module harness connector 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:0000000005237080

1.

CHECK COOLING FAN RELAY 1

1.

Turn ignition switch OFF.

2.

Remove cooling fan relay 1.

3.

Check the continuity between cooling fan relay 1 terminals
under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace cooling fan relay 1.

Cooling fan control module 1

Operation

Motor

Connector

Terminal

(+)

(–)

1

E301

4

5

Cooling fan operates.

2

E302

6

7

Terminals

Conditions

Continuity

3 and 5

12 V direct current supply between terminals 1 and 2

Existed

No current supply

Not existed

SEF090M

EC-468

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

ELECTRICAL LOAD SIGNAL

ELECTRICAL LOAD SIGNAL

Description

INFOID:0000000005237081

The electrical load signal (Headlamp switch signal, rear window defogger switch signal, etc.) is transferred
through the CAN communication line.

Component Function Check

INFOID:0000000005237082

1.

CHECK REAR WINDOW DEFOGGER SWITCH FUNCTION

1.

Turn ignition switch ON.

2.

Connect CONSULT-III and select “DATA MONITOR” mode.

3.

Select “LOAD SIGNAL” and check indication under the following conditions.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Go to 

EC-468, "Diagnosis Procedure"

.

2.

CHECK LIGHTING SWITCH FUNCTION

Check “LOAD SIGNAL” indication under the following conditions.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Go to 

EC-468, "Diagnosis Procedure"

.

3.

CHECK HEATER FAN CONTROL SWITCH FUNCTION

Select “HEATER FAN SW” and check indication under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-468, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005237083

1.

INSPECTION START

Confirm the malfunctioning circuit (rear window defogger, headlamp or heater fan). Refer to 

EC-468, "Compo-

nent Function Check"

.

Which circuit is related to the incident?

Rear window defogger>>GO TO 2.
Headlamp>>GO TO 3.
Heater fan>>GO TO 4.

2.

CHECK REAR WINDOW DEFOGGER SYSTEM

Refer to 

DEF-3, "Work Flow"

.

Monitor item

Condition

Indication

LOAD SIGNAL

Rear window defogger switch

ON

ON

OFF

OFF

Monitor item

Condition

Indication

LOAD SIGNAL

Lighting switch

ON at 2nd position

ON

OFF

OFF

Monitor item

Condition

Indication

HEATER FAN SW

Heater fan control switch

ON

ON

OFF

OFF