Circuit Description
WARNING: This page is about a different car, the 2003 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set when ECM detects coolant temperature is less than 167°F (75°C) when engine should be at normal operating temperature. Possible causes are:
- Defective thermostat.
- Defective cooling system.
- Defective engine coolant temperature sensor.
- Defective ECM.