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Home >> Nissan-Datsun >> 2012 >> Quest LE >> Repair and Diagnosis >> External Pages >> Different car >> Section 54 (Engine Control System - Component Testing) >> Cooling Fan >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2011 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK COOLING FAN RELAY POWER SUPPLY
    1. Turn ignition switch OFF.
    2. Disconnect cooling fan relays-2, -3.
    3. Turn ignition switch ON.
    4. Check the voltage between cooling fan relays-2, -3 harness connectors and ground.
      TERMINAL VOLTAGE REFERENCE CHART

      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 2.

      NO: Perform the trouble diagnosis for power supply circuit.

  2. 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 connectors and IPDM E/R harness connector.
      TERMINAL CONTINUITY REFERENCE CHART

      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 3.

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

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

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

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Perform the trouble diagnosis for power supply circuit.

  4. 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 connectors and cooling fan motor-1, -2 harness connectors.
      TERMINAL CONTINUITY REFERENCE CHART

      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 5.

      NO: Perform the trouble diagnosis for power supply circuit.

  5. 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 CHART

      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 6.

      NO: Perform the trouble diagnosis for power supply circuit.

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

      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 7.

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

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

      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 8.

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

  8. CHECK COOLING FAN RELAYS-2 AND -3

    Check cooling fan relays-2 and -3. Refer to "COMPONENT INSPECTION (COOLING FAN RELAY) ".

    Is the inspection result normal? 

    YES: GO TO 9.

    NO: Replace malfunctioning cooling fan relay.

  9. CHECK COOLING FAN MOTORS-1 AND -2

    Check cooling fan motors-1 and -2. Refer to "COMPONENT INSPECTION (COOLING FAN MOTOR) ".

    Is the inspection result normal? 

    YES: GO TO 10.

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

  10. CHECK INTERMITTENT INCIDENT

    Check intermittent incident. Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: Replace IPDM E/R. Refer to "EXPLODED VIEW ".

    NO: Repair or replace error-detected parts.

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