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Re: Temp gauge not working and Check Engine Light on.
That's true but if the ground circuit isn't tested, there will be no signal to the PCM........an open circuit is high resistance which results in a low coolant data reading....
That's why I would attach both leads to the harness, key on, engine not running, and watch the meter for a voltage change from 5.0 volts as you flexed the both wires......
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