P0128

DTC P0128: Coolant Thermostat DTC Detecting Condition and Trouble Area

DTC Detecting Condition And Trouble Area:

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

WARNING:
- When performing a road test, select a place where there is no traffic or possibility of a traffic accident and be very careful during testing to avoid occurrence of an accident.
- Road test should be carried out with 2 persons, a driver and a tester, on a level road.

NOTE: Check to make sure that the following conditions are satisfied when using this DTC Confirmation Procedure.
- Intake air temp.: -14 °C, 6.8 °F or higher
- Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)

1. With ignition switch OFF, connect scan tool to DLC.
2. Turn ON ignition switch and clear DTC using scan tool.
3. Start engine and drive vehicle in 40 - 60 km/h (25 - 40 mile/h) vehicle speed and 2000 - 3000 rpm engine speed for 20 minutes or more.
4. Stop vehicle and check DTC and pending DTC.

Steps 1 - 3:

DTC Troubleshooting