Thermostat Monitor

OBD System Description - Thermostat Monitor

System Description / Monitoring Procedure
The engine coolant temperature is estimated to model accumulated combustion heat value since engine start (based on intake mass air flow) and radiation heat value (radiation from engine, radiation when fuel shut-off, etc.). When estimated temperature reaches the specified temperature and the measured temperature is lower than criteria, the ECM will set DTC.

DTC Description / Detecting Condition / Confirmation Procedure

P0128
Refer to DTC P0116 / P011B / P0128:N32A. P0116

Thermostat Monitor

Operation






Enable conditions






Typical malfunction thresholds