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Diagnosis Procedure

PROCEDURE A

  1. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connection E38. Refer to Ground Inspection in " CIRCUIT INSPECTION ".

    Is the inspection result normal? 

    YES: Go to 2.

    NO: Repair or replace ground connection.

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

      Cooling fan motor-2 Ground Voltage
      Connector Terminal
      E54 1 Ground Battery voltage
      2
    3. Also check harness for short to ground or short to power.

    Is the inspection result normal? 

    YES: Go to  4.

    NO: Go to 3.

  3. DETECT MALFUNCTIONING PART

    Check the following.

    • 40 A fusible link (letter M)
    • Harness for open or short between cooling fan motor-2 and battery

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

  4. CHECK COOLING FAN MOTORS POWER SUPPLY CIRCUIT-II
    1. Disconnect cooling fan relay-4.
    2. Turn ignition switch ON.
    3. Check the voltage between cooling fan relay-4 harness connector and ground.
      VOLTAGE REFERENCE CHART

      Cooling fan relay-4 Ground Voltage
      Connector Terminal
      E57 2 Ground Battery voltage
    4. Also check harness for short to ground or short to power.

    Is the inspection result normal? 

    YES: Go to  6.

    NO: Go to 5.

  5. DETECT MALFUNCTIONING PART

    Check the following.

    • IPDM E/R harness connector E14
    • 15 A fuse (No. 63)
    • Harness for open or short between cooling fan relay-4 and fuse

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

  6. CHECK COOLING FAN MOTORS GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect cooling fan motor-1 harness connector.
    3. Check the continuity between cooling fan motor-1 harness connector and ground.
      CONTINUITY REFERENCE CHART

      Cooling fan motor-1 Ground Continuity
      Connector Terminal
      E53 3 Ground Existed
      4
    4. Also check harness for short to ground or short to power.

    Is the inspection result normal? 

    YES: Go to 7.

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

  7. CHECK COOLING FAN MOTORS CIRCUIT FOR OPEN AND SHORT
    1. Disconnect IPDM E/R harness connector E13.
    2. Check the continuity between cooling fan motor-2 harness connector and cooling fan relay-4 harness connector.
      CONTINUITY REFERENCE CHART

      Cooling fan motor-2 Cooling fan relay-4 Continuity
      Connector Terminal Connector Terminal
      E54 3 E57 3 Existed
    3. Check the continuity between cooling fan relay-4 harness connector and cooling fan motor-1 harness connector and ground.
      CONTINUITY REFERENCE CHART

      Cooling fan relay-4 Cooling fan motor-1 Continuity
      Connector Terminal Connector Terminal
      E57 5 E53 2 Existed
    4. Check the continuity between cooling fan relay-4 harness connector and IPDM E/R harness connector.
      CONTINUITY REFERENCE CHART

      Cooling fan relay-4 IPDM E/R Continuity
      Connector Terminal Connector Terminal
      E57 1 E13 31 Existed
    5. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: Go to 8.

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

  8. CHECK COOLING FAN RELAY-4

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

    Is the inspection result normal? 

    YES: Go to 9.

    NO: Replace cooling fan relay. For the relay number, refer to "WIRING DIAGRAM - ENGINE CONTROL SYSTEM - ". For the relay layout, refer to " ENGINE ROOM HARNESS ".

  9. CHECK COOLING FAN MOTORS

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

    Is the inspection result normal? 

    YES: Go to 10.

    NO: Replace malfunctioning cooling fan motor. Refer to " REMOVAL AND INSTALLATION ".

  10. 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 or connector.

PROCEDURE B

  1. CHECK GROUND CONNECTION
    1. Turn ignition switch OFF.
    2. Check ground connection E21, E38. Refer to Ground Inspection in " CIRCUIT INSPECTION ".

    Is the inspection result normal? 

    YES: Go to 2.

    NO: Repair or replace ground connection.

  2. CHECK IPDM E/R POWER SUPPLY AND GROUND CIRCUIT

    Power supply and ground circuit. Refer to " DIAGNOSIS PROCEDURE ".

    Is the inspection result normal? 

    YES: Go to 3.

    NO: Repair or replace malfunctioning part.

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

      Cooling fan motor-2 Ground Voltage
      Connector Terminal
      E54 1 Ground Battery voltage
      2
    3. Also check harness for short to ground or short to power.

    Is the inspection result normal? 

    YES: Go to  5.

    NO: Go to 4.

  4. DETECT MALFUNCTIONING PART

    Check the following.

    • 40 A fusible link (letter M)
    • Harness for open or short between cooling fan motor-2 and battery

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

  5. CHECK COOLING FAN MOTORS POWER SUPPLY CIRCUIT-II
    1. Disconnect cooling fan relay-5.
    2. Turn ignition switch ON.
    3. Check the voltage between cooling fan relay-5 harness connector and ground.
      VOLTAGE REFERENCE CHART

      Cooling fan relay-5 Ground Voltage
      Connector Terminal
      E59 2 Ground Battery voltage
    4. Also check harness for short to ground or short to power.

    Is the inspection result normal? 

    YES: Go to  7.

    NO: Go to 6.

  6. DETECT MALFUNCTIONING PART

    Check the following.

    • IPDM E/R harness connector E14
    • 15 A fuse (No. 63)
    • Harness for open or short between cooling fan relay-5 and fuse

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

  7. CHECK COOLING FAN MOTORS GROUND CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect cooling fan motor-1 harness connector.
    3. Check the continuity between cooling fan motor-1 harness connector and ground.
      CONTINUITY REFERENCE CHART

      Cooling fan motor-1 Ground Continuity
      Connector Terminal
      E53 3 Ground Existed
      4
    4. Check the continuity between cooling fan relay-5 harness connector and ground.
      CONTINUITY REFERENCE CHART

      Cooling fan relay-5 Ground Continuity
      Connector Terminal
      E59 5 Ground Existed
    5. Also check harness for short to ground or short to power.

    Is the inspection result normal? 

    YES: Go to 8.

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

  8. CHECK COOLING FAN MOTORS CIRCUIT FOR OPEN AND SHORT
    1. Disconnect IPDM E/R harness connector E15.
    2. Check the continuity between cooling fan motor-2 harness connector and cooling fan relay-5 harness connector.
      CONTINUITY REFERENCE CHART

      Cooling fan motor-2 Cooling fan relay-5 Continuity
      Connector Terminal Connector Terminal
      E54 4 E59 3 Existed
    3. Check the continuity between cooling fan motor-2 harness connector and IPDM E/R harness connector.
      CONTINUITY REFERENCE CHART

      Cooling fan motor-2 IPDM E/R Continuity
      Connector Terminal Connector Terminal
      E54 3 E10 7 Existed
    4. Check the continuity between cooling fan relay-5 harness connector and IPDM E/R harness connector.
      CONTINUITY REFERENCE CHART

      Cooling fan relay-5 IPDM E/R Continuity
      Connector Terminal Connector Terminal
      E59 1 E15 50 Existed
    5. Check the continuity between cooling fan motor-1 harness connector and IPDM E/R harness connector.
      CONTINUITY REFERENCE CHART

      Cooling fan motor-1 IPDM E/R Continuity
      Connector Terminal Connector Terminal
      E53 1 E10 4 Existed
      2 8
    6. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: Go to 9.

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

  9. CHECK COOLING FAN RELAY-5

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

    Is the inspection result normal? 

    YES: Go to 10.

    NO: Replace cooling fan relay. For the relay number, refer to "WIRING DIAGRAM - ENGINE CONTROL SYSTEM - ". For the relay layout, refer to " ENGINE ROOM HARNESS ".

  10. CHECK COOLING FAN MOTORS

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

    Is the inspection result normal? 

    YES: Go to 11.

    NO: Replace malfunctioning cooling fan motor. Refer to " REMOVAL AND INSTALLATION ".

  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 or connector.

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