Detection Condition

If ECT signal never exceeds 160°F (71°C) after engine start for specified period, PCM determines coolant thermostat is stuck open.

Monitoring Conditions

• Difference between engine coolant temperature at engine start up and minimum intake air temperature readings is less than 43°F (6°C).
• Intake air temperature is more than 14°F (-10°C).
• Vehicle speed is more than 5.9 MPH.

This is an intermittent monitor. MIL is illuminated when 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.