2004 Toyota RAV4 L, FWD, AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Coolant Temperature (ECT) Sensor: Inspection

  1. DRAIN ENGINE COOLANT 
  2. REMOVE ECT SENSOR 
    1. Disconnect the sensor connector.
    2. Using a 19 mm deep socket wrench, remove the sensor and gasket.
      Fig 1: Removing ECT Sensor
      G02639479Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT ECT SENSOR 

    Using an ohmmeter, measure the resistance between the terminals.

    Resistance: Refer to  Fig 2 

    Fig 2: Measuring Resistance Between Terminals Using Ohmmeter & Graph
    G02639480Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If the resistance is not as specified, replace the sensor.

  4. REINSTALL ECT SENSOR 
    1. Install a new gasket to the sensor.
    2. Using a 19 mm deep socket wrench, install the sensor.

      Torque: 20 N.m (200 kgf.cm, 15 ft.lbf) 

    3. Connect the sensor connector.
  5. REFILL WITH ENGINE COOLANT 
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.