Detection Condition

DTC is set if Engine Coolant Temperature (ECT) signal never exceeds 160°F (71°C), after engine is been running for specified period of time under following monitoring conditions. PCM determines that coolant thermostat is stuck open.

Monitoring Conditions

• Intake Air Temperature (IAT) is more than 14°F (-10°C).
• Difference between ECT at engine start and minimum IAT is less than 10.8°F (6°C).
• Vehicle speed is over 5.9 MPH.

This is a Continuous Monitor (CM). MIL illuminates if PCM detects malfunction condition in 2 consecutive drive cycles. Pending code is available if PCM detects malfunction condition during first drive cycle. Freeze Frame Data is available and DTC is stored in PCM memory.