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International Automotive Technicians Network
Re: Are You A Good Detective?
Posted to Technical Discussion Forum on 3/13/2015

I would agree with Russell and check the ECT circuit.

I believe the PCM initiated a Cold Start Emission Reduction event due to a faulty ECT reading. Since the conditions for running the event are not actually met, it fails the event and sets the P1400 code. ... Login to read more.