Thermostat Monitor
DTC Description / Detecting Condition / Confirmation Procedure
P0128 Refer to [DTC P0128: Coolant Temperature below Thermostat Regulating Temperature].
P0217 Refer to [DTC P0217: Engine Coolant Over Temperature Condition].
Coolant Temperature Below Thermostat Regulating Temperature Monitor (Coolant Thermostat)
Engine Coolant Over Temperature Condition Monitor