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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 796 (AIR CONDITIONING)ENGINE COOLANT TEMPERATURE (ECT) SWITCHINSPECTION
2004 Toyota Matrix XR, FWD, Standard

Engine Coolant Temperature (ECT) Switch: Inspection

2004 Toyota Matrix XR, FWD, StandardSECTION Inspection
WARNING: This page is about a different car, the 2004 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. REMOVE ENGINE UNDER COVER 
  2. DRAIN ENGINE COOLANT FROM RADIATOR 

    HINT:

    It is not necessary to drain out all coolant

  3. REMOVE ENGINE COOLANT TEMPERATURE SWITCH 
    1. Disconnect the connector.
    2. Remove the engine coolant temperature switch.
    3. Remove the O-ring from the switch.
      Fig 1: Removing Engine Coolant Temperature Switch
      G00889100Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT ENGINE COOLANT TEMPERATURE SWITCH 
    1. Using an ohmmeter, check that no continuity exists between the terminals when the coolant temperature is above 100°C (212°F).

      If continuity exists, replace the switch.

    2. Using an ohmmeter, check that continuity exists between the terminals when the coolant temperature is below 91°C (196°F).

      If there no continuity exists, replace the switch.

      Fig 2: Inspecting Engine Coolant Temperature Switch
      G00889101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. INSTALL ENGINE COOLANT TEMPERATURE SWITCH 
    1. Install the new O-ring to the switch.
    2. Install the engine coolant temperature switch.
      1. Torque: 7.4 N.m (75 kgf.cm, 65 in.lbf) 
  6. FILL WITH ENGINE COOLANT TO RADIATOR 
  7. INSTALL ENGINE UNDER COVER 
RENDER: 1.0x

NO RELATED

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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.