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Home >> Infiniti >> 2013 >> FX50 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - System Component Testing >> Cooling Fan >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK COOLING FAN CONTROL MODULE POWER SUPPLY CIRCUIT-I 
    1. Turn ignition switch OFF.
    2. Disconnect cooling fan control module harness connectors E37, E38.
    3. Turn ignition switch ON.
    4. Check the voltage between cooling fan control module harness connector and ground.
      Cooling fan control module Ground Voltage
      Connector Terminal
      E37 (Cooling fan control module 1) 3 Ground Battery voltage
      E38 (Cooling fan control module 2) 3

      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.
      Cooling fan control module Ground Continuity
      Connector Terminal
      E37 (Cooling fan control module 1) 1 Ground Existed
      E38 (Cooling fan control module 2) 1
    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.

  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.
      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 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 connector.
      IPDM E/R Cooling fan control module Continuity
      Connector Terminal Connector Terminal
      E9 97 E37 (Cooling fan control module 1) 2 Existed
      E38 (Cooling fan control module 2) 2 Existed
    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 OUTPUT SIGNAL CIRCUIT 
    1. Reconnect all harness connectors disconnected.
    2. Disconnect cooling fan control module harness connectors E301, E303.
    3. Turn ignition switch ON.
    4. Check the voltage between cooling fan control module terminals and ground.
      Cooling fan control module Ground Voltage
      Connector Terminal
      - (Cooling fan control module 1) 4 Ground Battery voltage
      - (Cooling fan control module 2) 6

      Is the inspection result normal? 

      YES: GO TO 6.

      NO: Replace malfunctioning cooling fan control module. Refer to "EXPLODED VIEW ".

  6. CHECK COOLING FAN MOTORS -1 AND -2 

    Refer to "COMPONENT INSPECTION (COOLING FAN MOTOR) ".

    Is the inspection result normal? 

    YES: GO TO  11.

    NO: Replace malfunctioning cooling fan motor. Refer to "EXPLODED VIEW ".

  7. CHECK COOLING FAN CONTROL MODULE POWER SUPPLY CIRCUIT-II 
    1. Turn ignition switch OFF.
    2. Disconnect cooling fan relay-1 and cooling fan relay-2.
    3. Check the voltage between cooling fan relay harness connector and ground.
      Cooling fan relay Ground Voltage
      Connector Terminal
      E15 (Cooling fan relay-1) 3 Ground Battery voltage
      E17 (Cooling fan relay-2) 3
    4. Turn ignition switch ON.
    5. Check the voltage between cooling fan relay harness connector and ground.
      Cooling fan relay Ground Voltage
      Connector Terminal
      E15 (Cooling fan relay-1) 1 Ground Battery voltage

      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)
    • 50 A fusible link (letter O)
    • 50 A fusible link (letter S)
    • IPDM E/R harness connector E7
    • 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, 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.
      Cooling fan relay IPDM E/R Continuity
      Connector Terminal Connector Terminal
      E15 (Cooling fan relay-1) 2 E6 42 Existed
    4. Check the continuity between cooling fan relay harness connector and cooling fan control module harness connector.
      Cooling fan relay Cooling fan control module Continuity
      Connector Terminal Connector Terminal
      E15 (Cooling fan relay-1) 5 E37 (Cooling fan control module-1) 3 Existed
      E17 (Cooling fan relay-2) 5 E38 (Cooling fan control module-2) 3 Existed
    5. Check the continuity between cooling fan relay-1 harness connector and cooling fan relay-2 harness connector.
      Cooling fan relay Continuity
      Connector Terminal Connector Terminal
      E15 (Cooling fan relay-1) 5 E17 (Cooling fan relay-2) 1 Existed
    6. Check the continuity between cooling fan relay-2 harness connector and ground.
      Cooling fan relay Ground Continuity
      Connector Terminal
      E17 (Cooling fan relay-1) 2 Ground Existed
    7. 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 RELAYS -1 AND -2 

    Refer to "COMPONENT INSPECTION (COOLING FAN RELAY) ".

    Is the inspection result normal? 

    YES: GO TO 11.

    NO: Replace malfunctioning cooling fan relay.

  11. CHECK INTERMITTENT INCIDENT 

    Perform "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION ".

    NO: Repair or replace harness connectors.

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