P0128

DTC P0128: Coolant Thermostat

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.: 70 °C (158 °F) or less.
- Altitude (barometric pressure): 2500 m, 8202 ft or less (560 mmHg, 75 kPa or more)
- Engine coolant temp. at engine start: between -10 °C and 56 °C (14 °F and 133 °F)

1. With ignition switch turned 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.

Step 1-4:

Step 5-8:

DTC Troubleshooting