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Home >> Nissan-Datsun >> 2009 >> Murano LE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing >> Cooling Fan >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK COOLING FAN RELAY POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect cooling fan relays-2, -3 harness connectors.
    3. Turn ignition switch ON.
    4. Check the voltage between cooling fan relays-2, -3 harness connector and ground.
      TERMINALS VOLTAGE REFERENCE

      Cooling fan relay Ground Voltage
      Connector Terminal
      E57 (cooling fan relay-2) 2 Ground Battery voltage
      5
      E59 (cooling fan relay-3) 2
      5

      Is the inspection result normal? 

      YES: GO TO  3.

      NO: GO TO 2.

  2. DETECT MALFUNCTIONING PART

    Check the following.

    • 40A fusible link (letter K)
    • 10A fuse (No. 42)
    • IPDM E/R harness connector E10
    • Harness for open or short between cooling fan relay-2 and battery
    • Harness for open or short between cooling fan relay-3 and battery
    • Harness for open or short between cooling fan relay-2 and IPDM E/R
    • Harness for open or short between cooling fan relay-3 and IPDM E/R

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

  3. CHECK COOLING FAN RELAY OUTPUT SIGNAL CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R harness connectors.
    3. Check the continuity between cooling fan relay-2, -3 harness connector and IPDM E/R harness connector.
      TERMINAL CONTINUITY REFERENCE

      Cooling fan relay IPDM E/R Continuity
      Connector Terminal Connector Terminal
      E57 (cooling fan relay-2) 1 E11 42 Existed
      E59 (cooling fan relay-3) 1 E10 34
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Repair open circuit or short to ground or short to power in harness or connectors.

  4. CHECK COOLING FAN MOTOR POWER SUPPLY CIRCUIT
    1. Disconnect cooling fan motor-1 harness connector.
    2. Check the voltage between cooling fan motor-1 harness connector and ground.
      TERMINALS VOLTAGE REFERENCE

      Cooling fan motor-1 Ground Voltage
      Connector Terminal
      E301 1 Ground Battery voltage
      2

      Is the inspection result normal? 

      YES: GO TO  6.

      NO: GO TO 5.

  5. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connector E70, E305
    • 40A fusible link (letter M)
    • Harness for open or short between cooling fan motor-1 and battery

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

  6. CHECK COOLING FAN MOTOR CIRCUIT-I
    1. Disconnect cooling fan motor-2 harness connector.
    2. Check the continuity between cooling fan relay-2, -3 harness connector and cooling fan motor-1, -2 harness connector.
      TERMINAL CONTINUITY REFERENCE

      Cooling fan relay Cooling fan motor Continuity
      Connector Terminal Connector Terminal
      E57 (cooling fan relay-2) 3 E302 (Cooling fan motor-2) 2 Existed
      7 E301 (Cooling fan motor-1) 3
      E59 (cooling fan relay-3) 3 E302 (Cooling fan motor-2) 1
      7 E301 (Cooling fan motor-1) 4
    3. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  8.

      NO: GO TO 7.

  7. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connector E70, E305
    • Harness for open or short between cooling fan motor-1 and cooling fan relay-2
    • Harness for open or short between cooling fan motor-1 and cooling fan relay-3
    • Harness for open or short between cooling fan motor-2 and cooling fan relay-2
    • Harness for open or short between cooling fan motor-2 and cooling fan relay-3

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

  8. CHECK COOLING FAN MOTOR CIRCUIT-II
    1. Check the continuity between IPDM E/R harness connector and cooling fan motor-1, -2 harness connector.
      TERMINAL CONTINUITY REFERENCE

      IPDM E/R Cooling fan motor Continuity
      Connector Terminal Connector Terminal
      E10 35 E301 (Cooling fan motor-1) 4 Existed
      38 E302 (Cooling fan motor-2) 1
    2. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  10.

      NO: GO TO 9.

  9. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connector E70, E305
    • Harness for open or short between cooling fan motor-1 and IPDM E/R
    • Harness for open or short between cooling fan motor-2 and IPDM E/R

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

  10. CHECK COOLING FAN MOTOR CIRCUIT-III
    1. Check the continuity between cooling fan relay-2, -3 harness connector and ground.
      TERMINAL CONTINUITY REFERENCE

      Cooling fan motor Ground Continuity
      Connector Terminal
      E57 (cooling fan relay-2) 6 Ground Existed
      E59 (cooling fan relay-3) 6
    2. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 11.

      NO: Repair open circuit or short to ground or short to power in harness or connectors.

  11. CHECK COOLING FAN MOTOR CIRCUIT-IV
    1. Check the continuity between cooling fan motor-2 harness connector and ground.
      TERMINAL CONTINUITY REFERENCE

      Cooling fan motor-2 Ground Continuity
      Connector Terminal
      E302 3 Ground Existed
      4
    2. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 12.

      NO: Repair open circuit or short to ground or short to power in harness or connectors.

  12. CHECK COOLING FAN RELAYS-2 AND -3

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

    Is the inspection result normal? 

    YES: GO TO 13.

    NO: Replace malfunctioning cooling fan relay.

  13. CHECK COOLING FAN MOTORS-1 AND -2

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

    Is the inspection result normal? 

    YES: GO TO 14.

    NO: Replace malfunctioning cooling fan motor.

  14. CHECK INTERMITTENT INCIDENT

    Perform "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: Replace IPDM E/R.

    NO: Repair or replace harness connectors.

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