1.START Check cooling fan function. Refer to Component Function Check (GT-R certified NISSAN dealer). Which cooling fan does not operate? Cooling fan 1>>GO TO 2. Cooling fan 2>>GO TO 8.
Cooling fan 1 and 2>>GO TO19.
2.CHECK COOLING FAN CONTROL MODULE 1 POWER SUPPLY CIRCUIT-I

1. Turn ignition switch OFF.
2. Disconnect cooling fan control module 1 harness connector.
3. Turn ignition switch ON.
4. Check the voltage between cooling fan control module 1 harness connector and ground.

   Cooling fan control module 1 | Ground | Voltage
   Connector | Terminal
   E35 | 3 | Ground | Battery voltage

Is the inspection result normal?
YES>>GO TO 4.
NO>>GO TO 3.
3.CHECK COOLING FAN CONTROL MODULE 1 POWER SUPPLY CIRCUIT-I

1. Turn ignition switch OFF.
2. Disconnect cooling fan relay 1.
3. Check the continuity between cooling fan control module 1 harness connector and cooling fan relay 1 harness connector.

   Cooling fan control module 1 | Cooling fan relay 1 | Continuity
   Connector | Terminal | Connector | Terminal
   E35 | 3 | E17 | 5 | Existed

4. Also check harness for short to ground and short to power.

Is the inspection result normal?
YES>>GO TO 18.
NO>>Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK COOLING FAN CONTROL MODULE 1 GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.
2. Check the continuity between cooling fan control module 1 harness connector and ground.

   Cooling fan control module 1 | Ground | Continuity
   Connector | Terminal
   E35 | 1 | Ground | Existed

3. Also check harness for short to power.

Is the inspection result normal?
YES>>GO TO 5.
NO>>Repair open circuit or short to power in harness or connectors.
5.CHECK COOLING FAN CONTROL MODULE 1 CIRCUIT FOR OPEN AND SHORT

1. Disconnect IPDM E/R harness connector.
2. Check the continuity between cooling fan control module 1 harness connector and IPDM E/R harness connector.

   Cooling fan control module 1 | IPDM E/R | Continuity
   Connector | Terminal | Connector | Terminal
   E35 | 2 | E9 | 97 | Existed

3. Also check harness for short to ground and short to power.

Is the inspection result normal?
YES>>GO TO 6.
NO>>Repair open circuit, short to ground or short to power in harness or connectors.
6.CHECK COOLING FAN CONTROL MODULE 1 OUTPUT SIGNAL CIRCUIT

1. Reconnect all harness connectors disconnected.
2. Disconnect cooling fan control module 1 harness connectors.
3. Turn ignition switch ON.
4. Check the voltage between cooling fan control module 1 terminals and ground.

   Cooling fan control module 1 | Ground | Voltage
   Connector | Terminal
   E301 | 4 | Ground | Battery voltage
   E302 | 6

Is the inspection result normal?
YES>>GO TO 7.
NO>>Replace cooling fan control module 1.
7.CHECK COOLING FAN MOTOR 1
Refer to Component Inspection (Cooling Fan Motor) (GT-R certified NISSAN dealer).
Is the inspection result normal?
YES>>GO TO 18.
NO>>Replace cooling fan motor 1.
8.CHECK COOLING FAN CONTROL MODULE 2 POWER SUPPLY CIRCUIT-I

1. Turn ignition switch OFF.
2. Disconnect cooling fan control module 2 harness connector.
3. Turn ignition switch ON.
4. Check the voltage between cooling fan control module 2 harness connector and ground.

   Cooling fan control module 2 | Ground | Voltage
   Connector | Terminal
   E37 | 3 | Ground | Battery voltage

Is the inspection result normal?
YES>>GO TO 9.
NO>>GO TO 13.
9.CHECK COOLING FAN CONTROL MODULE 2 GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.
2. Check the continuity between cooling fan control module 2 harness connector and ground.

   Cooling fan control module 2 | Ground | Continuity
   Connector | Terminal
   E37 | 1 | Ground | Existed

3. Also check harness for short to power.

Is the inspection result normal?
YES>>GO TO 10.
NO>>Repair open circuit or short to power in harness or connectors.
10.CHECK COOLING FAN CONTROL MODULE 2 CIRCUIT FOR OPEN AND SHORT

1. Disconnect IPDM E/R harness connector.
2. Check the continuity between cooling fan control module 2 harness connector and IPDM E/R harness connector.

   Cooling fan control module 2 | IPDM E/R | Continuity
   Connector | Terminal | Connector | Terminal
   E37 | 2 | E9 | 97 | Existed

3. Also check harness for short to ground and short to power.

Is the inspection result normal?
YES>>GO TO 11.
NO>>Repair open circuit, short to ground or short to power in harness or connectors.
11.CHECK COOLING FAN CONTROL MODULE 2 OUTPUT SIGNAL CIRCUIT

1. Reconnect all harness connectors disconnected.
2. Disconnect cooling fan control module 2 harness connectors.
3. Turn ignition switch ON.
4. Check the voltage between cooling fan control module 2 terminals and ground.

   Cooling fan control module 2 | Ground | Voltage
   Connector | Terminal
   E303 | 4 | Ground | Battery voltage
   E304 | 6

Is the inspection result normal?
YES>>GO TO 12.
NO>>Replace cooling fan control module 2.
12.CHECK COOLING FAN MOTOR 2
Refer to Component Inspection (Cooling Fan Motor) (GT-R certified NISSAN dealer).
Is the inspection result normal?
YES>>GO TO 18.
NO>>Replace cooling fan motor 2.
13.CHECK COOLING FAN RELAY 2 POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.
2. Disconnect cooling fan relay 2.
3. Turn ignition switch ON.
4. Check the voltage between cooling fan relay 2 harness connector and ground.

   Cooling fan relay 2 | Ground | Voltage
   Connector | Terminal
   E19 | 2 | Ground | Battery voltage
   3

Is the inspection result normal?
YES>>GO TO 15.
NO>>GO TO 14.
14.DETECT MALFUNCTIONING PART
Check the following.

- 50A fusible link (letter M)
- Harness for open or short between cooling fan relay 2 and battery
- Harness for open or short between cooling fan relay 1 and cooling fan relay 2

>>Repair open circuit, short to ground or short to power in harness or connectors.
15.CHECK COOLING FAN RELAY 2 GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.
2. Check the continuity between cooling fan relay 2 harness connector and ground.

   Cooling fan relay 2 | Ground | Continuity
   Connector | Terminal
   E17 | 1 | Ground | Existed

3. Also check harness for short power.

Is the inspection result normal?
YES>>GO TO 16.
NO>>Repair open circuit or short to power in harness or connectors.
16.CHECK COOLING FAN CONTROL MODULE 2 POWER SUPPLY CIRCUIT-II

1. Check the voltage between cooling fan relay 2 harness connector and cooling fan control module 2 harness connector.

   Cooling fan relay 2 | Cooling fan control module 2 | Continuity
   Connector | Terminal | Connector | Terminal
   E19 | 5 | E37 | 3 | Existed

2. Also check harness for short to ground and short to power.

Is the inspection result normal?
YES>>GO TO 17.
NO>>Repair open circuit, short to ground or short to power in harness or connectors.
17.CHECK COOLING FAN RELAY 2
Refer to Component Inspection (Cooling Fan Relay) (GT-R certified NISSAN dealer).
Is the inspection result normal?
YES>>GO TO 18.
NO>>Replace cooling fan relay 2.
18.CHECK INTERMITTENT INCIDENT
Perform Intermittent Incident.
>>INSPECTION END
19.CHECK COOLING FAN RELAY 1 POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.
2. Disconnect cooling fan relay 1.
3. Check the voltage between cooling fan relay 1 harness connector and ground.

   Cooling fan relay 1 | Ground | Voltage
   Connector | Terminal
   E17 | 2 | Ground | Battery voltage
   3

Is the inspection result normal?
YES>>GO TO 21.
NO>>GO TO 20.
20.DETECT MALFUNCTIONING PART
Check the following.

- 50A fusible link (letter F)
- 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.
21.CHECK COOLING FAN RELAY 1 GROUND CIRCUIT FOR OPEN AND SHORT

1. Disconnect IPDM E/R harness connector.
2. Check the continuity between cooling fan relay 1 harness connector and IPDM E/R harness connector.

   Cooling fan relay 1 | IPDM E/R | Continuity
   Connector | Terminal | Connector | Terminal
   E17 | 1 | E6 | 42 | Existed

3. Also check harness for short to ground and short to power.

Is the inspection result normal?
YES>>GO TO 22.
NO>>Repair open circuit, short to ground or short to power in harness or connectors.
22.CHECK COOLING FAN CONTROL MODULE 1 POWER SUPPLY CIRCUIT-II

1. Disconnect cooling fan control module 1 harness connector.
2. Check the continuity between cooling fan relay 1 harness connector and control module 1 harness connector.

   Cooling fan relay 1 | Cooling fan control module 1 | Continuity
   Connector | Terminal | Connector | Terminal
   E17 | 5 | E35 | 3 | Existed

3. Also check harness for short to ground and short to power.

Is the inspection result normal?
YES>>GO TO 23.
NO>>Repair open circuit, short to ground or short to power in harness or connectors.
23.CHECK IPDM E/R GROUND CIRCUIT FOR OPEN AND SHORT

1. Disconnect IPDM E/R harness connector.
2. Check the continuity between IPDM E/R harness connector and ground.

   IPDM E/R | Ground | Continuity
   Connector | Terminal
   E5 | 12 | Ground | Existed
   E6 | 41

3. Also check harness for short to power.

Is the inspection result normal?
YES>>GO TO 24.
NO>>Repair open circuit or short to power in harness or connectors.
24.CHECK COOLING FAN CONTROL MODULE 1 CIRCUIT FOR OPEN AND SHORT

1. Check the continuity between IPDM E/R harness connector and cooling fan control module 1 harness connector.

   IPDM E/R | Cooling fan control module 1 | Continuity
   Connector | Terminal | Connector | Terminal
   E9 | 97 | E35 | 2 | Existed

2. Also check harness for short to ground and short to power.

Is the inspection result normal?
YES>>GO TO 25.
NO>>Repair open circuit, short to ground or short to power in harness or connectors.
25.CHECK COOLING FAN RELAY 1
Refer to Component Inspection (Cooling Fan Relay) (GT-R certified NISSAN dealer).
Is the inspection result normal?
YES>>GO TO 26.
NO>>Replace cooling fan relay 1.
26.CHECK INTERMITTENT INCIDENT
Perform Intermittent Incident.
Is the inspection result normal?
YES>>Replace IPDM E/R
NO>>Repair open circuit, short to ground or short to power in harness or connectors.