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Component Testing: THERMOSENSOR

  1. Ensure engine coolant temperature is below 104°F (40°C). Disconnect vacuum hose No. 19 from charcoal canister. If no vacuum is present at idle, thermovalve is open and test may be performed.
  2. Unplug connector at control unit. Check for resistance between Blue/Yellow and Brown/Black terminals. Resistance should be above 1000 ohms. Run engine until cooling fan comes on and check resistance again. Resistance should be about 200 ohms.
  3. If resistance is outside specified ranges, replace thermosensor and retest. If ohmmeter shows no continuity, check wires. If no defects are found, replace thermosensor and retest.
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