System Description

The system accumulates the intake air quantity to simulate the engine operating condition as the warm up counter. The thermostat is considered malfunctioning if the coolant temperature does not reach 167°F (75°C). The thermostat regulating temperature is 160-199°F (71-93°C). The time interval required for monitoring is based on the accumulated intake air quantity.

1. Time interval required for monitoring: approximately 15 minutes maximum.
2. Monitoring condition: engine start ECT is 18-176°F (-8-80°C).