Inspect for the following conditions:
Corrosion on the ECT sensor terminals
Improper or corroded terminals at the ECT harness connector
Loose terminals in the ECT harness connector.
If all OK here, measure the voltage from the signal circuit of the ECT sensor to a good ground with a DMM. Voltages should be 4.8 - 5.2 V.
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Wednesday, March 11th, 2009 AT 1:52 PM