high speed comming on @ start up

Discussion in 'Technical' started by beaver, Dec 8, 2018.

  1. beaver

    beaver southern zeds

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    High speed fan activates at start up for 30 seconds, then turns of. this happens at all start ups, hot or cold.
    Any ideas?
     
  2. TWIN TERROR

    TWIN TERROR Well-Known Member

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    Check the ecu temperature sensor for corrosion on the plug. Check the other one while you are at it. If it is unplugged or corroded the fan runs as a fail safe. That's how you test the fan circuit just unplug it and it should come on so if it's corroded or loose at the terminal it can come on. The ecu one is the 2 wire one and the gauge one is a single wire.
    Cheers
     
  3. beaver

    beaver southern zeds

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    Thanks, the sensor is near new, there is no corrosion in the connector, I disconnected the sensor connector and the fan runs. Ive turned it of on hi low with nistue dr300zx and data scan and it responds as it should, continuity between the sensor and ecu is there. I'm starting to think the sensor may be faulty.
     
  4. East Coast Z

    East Coast Z Well-Known Member

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    What are the resistance readings of the sensor when the engine is cold?
     
  5. beaver

    beaver southern zeds

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    Thanks, resistance cold is 2.66.. its within spec.
     

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