Circuit Description

While engine is warming, VCM monitors Engine Coolant Temperature (ECT) sensor to determine the amount of time it takes engine to reach coolant temperature required for closed loop operation. DTC will set if VCM determines that ECT does not reach minimum coolant temperature required for closed loop operation in a specified amount of time.

For duplication of DTC, ensure engine is running, no ECT or IAT related DTCs are set, ECT and IAT is greater than -40°F (-40°C), and start-up ECT is 104°F (40°C) or less.