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OBD System Description - Thermostat Monitor




OBD System Description - Thermostat Monitor

System Description / Monitoring Procedure

The engine coolant temperature is estimated to model accumulated combustion heat value from engine start (based on mass intake air flow) and radiation heat value (radiation from engine, radiation when fuel shut-off, etc.). Malfunction is detected when estimated temperature reaches the specified temperature and the measured temperature is lower than criteria.

DTC Description / Detecting / Confirmation Procedure

P0128

Refer to P0116 DTC P0116 / P0125 / P0128.

Thermostat Monitor

Operation





Enabled conditions





Typical malfunction thresholds





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