P0128

DTC P0128: Coolant Thermostat (Coolant Temp. below Thermostat Regulating Temp.)

Wiring Diagram:

Wiring Diagram

DTC Detecting Condition And Trouble Area:

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

NOTE: Check to make sure that the following conditions are satisfied when using this "DTC Confirmation Procedure".
- Atmospheric pressure: higher than 560 mmHg (Altitude: lower than 2790 m (9150 ft))
- Intake air temperature: -14 °C (6.8 °F) or higher
- Engine coolant temperature at engine start: between -10 °C (14 °F) and 56 °C (133 °F)

1. With ignition switch OFF, connect scan tool.
2. Turn ON ignition switch, clear DTC if any.
3. Start engine and drive vehicle at about 60 km/h (37 mph) for 15 min.
4. Check DTC and pending DTC by using scan tool.

Step 1 - 4:

DTC Troubleshooting