Description Indicates the sensor signal is greater than the self-test maximum the ECT sensor maximum is 4.6 volts or 50 c (58 f ) .. Possible causes open circuit in the harness sensor signal short to voltage incorrect harness connector damaged sensor damaged PCM Diagnostic Aids an ECT PID reading greater than 4.6 volts with the ignition on engine off or during any engine operating mode indicates a concern is present Diagnostic aids
Using signal simulation,
disconnect sensor and
simulate 1.0V on sensor
signal circuit. Simulated
1.0V signal and scan PID
voltage value should be
similar. If voltage is similar
check sensor, if voltage is
not similar check related
circuit and PCM
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