OBD System Description - Thermostat Monitor

OBD System Description - Thermostat Monitor

System Description / Monitoring Procedure

The system accumulates the base quantity of injected fuel to simulate the engine operating condition as the warm up counter.

The thermostat is considered malfunctioning if the coolant temperature does not reach the warmed-up temperature at which the thermostat is at the regulating temperature within 11 degrees Celsius, or the highest temperature required to enable other diagnostics, after the specified elapsed time.

The time interval required for monitoring is based on the time after engine start.

DTC Description / Detecting Condition / Confirmation Procedure

P0128

Refer to P0128 DTC P0128: Coolant Thermostat.

Thermostat Monitor

Operation





Enable condition





Typical malfunction thresholds