Circuit Description

While engine is warming, PCM monitors the Engine Coolant Temperature (ECT) sensor to determine how long it takes engine to reach the coolant temperature required for closed loop operation. DTC will set if PCM determines that engine is not reaching closed loop temperature in a specified amount of time. Test will not run if either the intake air or engine coolant temperature is too low at start up. PCM will only run this DTC on a cold start and only once per cold start cycle.