2004 Toyota Tundra Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Coolant Temperature (ECT) Sensor: Inspection

  1. REMOVE NO. 2 TIMING BELT COVER (See  TIMING BELT (5VZ-FE)  ) 
  2. REMOVE FUEL PIPE 
    Fig 1: Removing Fuel Pipe
    G04208008Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. REMOVE ECT SENSOR 
    1. Disconnect the sensor connector.
    2. Using a 19 mm deep socket wrench, remove the sensor and gasket.
    Fig 2: Removing Sensor And Gasket
    G04208009Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT ECT SENSOR 

    Using an ohmmeter, measure the resistance between the terminals.

    Resistance: Refer to the graph 

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

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

      Torque: 19.6 N.m (200 kgf.cm, 14 ft.lbf) 

    3. Connect the sensor connector.
  6. REINSTALL FUEL PIPE 

    Install the fuel pipe with 4 new gaskets and the 2 union bolts.

    Torque: 34.3 N.m (350 kgf.cm, 25 ft.lbf) 

  7. REINSTALL NO. 2 TIMING BELT COVER (See  TIMING BELT (5VZ-FE)  ) 
    Fig 3: Measuring Resistance Between Terminals
    G04208010Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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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.