Chrysler
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    ECT Sensor Circuit High Input Conditions
Cause:
    Key on and then the PCM detected the ECT sensor input of more than 4.9v for over 3 seconds.

Ford
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    ECT Sensor High Conditions
Cause:
    Key on or engine running, then the PCM detected an ECT sensor signal of more than 4.60v (-46°F)

Generic
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    Engine Coolant Temperature Sensor 1 Circuit High

GM
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    ECT Sensor Circuit Low Temperature Conditions
Cause:
    Engine runtime over 4 minutes, then the PCM detected that the ECT sensor input was less than -31°F at any time.

Nissan
Type:
    Powertrain - Fuel and Air Metering - ISO/SAE Controlled
Description:
    Engine coolant temperature (ECT) sensor - voltage high
Cause:
    Wiring, ECT sensor, ECM