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METHOD AND APPARATUS FOR DETERMINING COOLANT TEMPERATURE RATIONALITY IN A MOTOR VEHICLE

  • US 20050178130A1
  • Filed: 02/18/2004
  • Published: 08/18/2005
  • Est. Priority Date: 02/18/2004
  • Status: Active Grant
First Claim
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1. A method of testing an engine coolant temperature (ECT) sensor in a vehicle comprising a processor in communication with the ECT sensor and an intake air temperature (IAT) sensor, the method comprising the steps of:

  • receiving an ECT reading from the ECT sensor and a IAT reading at the processor;

    evaluating a temperature difference between the ECT reading and the IAT reading to determine if an irrationality is present, wherein the evaluating step comprises monitoring the IAT reading during operation of the vehicle to identify the presence of an engine block heater if the temperature difference exceeds a pre-determined threshold; and

    providing a rationality indication in response to the evaluating step.

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