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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 330 (AIR CONDITIONING SYSTEM)ENGINE COOLANT TEMPERATURE (ECT) SWITCHINSPECTION
2004 Toyota Celica GT, Standard

Engine Coolant Temperature (ECT) Switch: Inspection

2004 Toyota Celica GT, StandardSECTION Inspection
WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: It is not necessary to drain out all the coolant.
  1. Drain engine coolant from radiator  .
  2. See CONVERTER & INVERTER ASSEMBLY REMOVAL .
  3. Remove engine coolant temperature switch  :
    1. Disconnect the connector.
      Fig 1: Locating Water Temperature Switch & Connector
      G01065512Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the water temperature switch.
  4. Inspect engine coolant temperature switch continuity  :
    1. Using an ohmmeter, check the no continuity exists between the terminals when the coolant temperature is above 100°C (212°F).
      Fig 2: Testing Engine Coolant Temperature Switch
      G01065513Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If continuity exists, replace the switch.

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

      If no continuity exists, replace the switch.

    5. NOTE: Lubricate a new "O" ring with soapy water and install them to the switch.
  5. Install engine coolant temperature switch  .

    Torque: 34 N.m (350 kgf.cm, 25 ft.lbf)  .

  6. See INSTALLATION OF CONVERTER & INVERTER .
  7. Fill with engine coolant  .
RENDER: 1.0x

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

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