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On-Vehicle Inspection [10/2015 - ]: Procedure

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  1. INSPECT COOLING FAN ECU 
    1. Check and ensure the following conditions:
      1. The engine switch is off.
      2. The engine coolant temperature is less than 92°C (198°F).
      3. The battery voltage is between 11 to 14 V.
      4. The A/C switch is off.
    2. Connect the pickup of a clamp-on ammeter around 1 of the 2 wires for the cooling fan motor.
    3. Turn the engine switch on (IG) and wait for approximately 10 seconds. Check that the cooling fans are not operating.
    4. Start the engine. Check that the cooling fans are not operating with the engine idling.

      HINT: 

      • Make sure that the engine coolant temperature is less than 92°C (198°F).
      • Turn the A/C switch off.
    5. Check that the cooling fans operate when the A/C switch is turned on.
    6. Measure the current while the cooling fan motors are turning.

      Standard Current

      Item Condition Specified Condition
      Cooling fan motor Battery voltage applied at 20°C (68°F) 15.0 to 21.0 A
      No. 2 cooling fan motor 15.0 to 21.0 A

      HINT: 

      The engine coolant temperature should be less than 92°C (198°F).

    7. Check that the cooling fans operate when the engine coolant temperature sensor connector is disconnected.
    8. Measure the current while the cooling fan motors are turning.

      Standard Current

      Item Condition Specified Condition
      Cooling fan motor Battery voltage applied at 20°C (68°F) 15.0 to 21.0 A
      No. 2 cooling fan motor 15.0 to 21.0 A
    9. After the engine is warmed up, check that the cooling fans operate as shown in the illustration.
      GTY658366Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Operating Diagram
      *b MAX HI
      *c HI
      *d LO
      *e MAX LO
      *f Fan Speed

      HINT: 

      • The engine coolant temperature at which the fans start operating is approximately 94°C (201°F).
      • This system can also be checked using the Techstream.
      • Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

      Powertrain > Engine > Data List 

      Tester Display
      Coolant Temperature
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