The ECT signal is implausible relative to other data.
SYMPTOMS
- Check-engine light
- Cooling fan or gauge anomalies
- Economy/drivability issues
LIKELY CAUSES
- Failing ECT sensor
- Wiring fault
- Thermostat fault
- Low coolant
DIAGNOSIS STEPS
- Compare ECT vs IAT at cold start
- Check wiring/connector
- Verify coolant level
RELATED PARTS
- ECT sensor