Pinpoint Test K: Engine Coolant Temperature (ECT) Sensor
WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Regeneration may occur during normal operation. During regeneration, diagnostic procedures may display biased values. If a regeneration occurs during diagnostic procedures, allow the process to complete before continuing diagnostics.
Refer to ELECTRONIC ENGINE CONTROLS - 3.0L DIESEL for schematic and connector information.
Normal Operation and Fault Conditions
Refer to the DTC Fault Trigger Conditions.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| PCM P0115:00 | Engine Coolant Temperature Sensor 1 Circuit: No Sub Type Information | Sets when the PCM detects the ECT sensor signal falls below or exceeds the calibrated threshold. Make sure the intake air and engine coolant temperatures are similar when the engine is cold. Make sure the ECT sensor and the actual engine operating temperatures are the same. |
| PCM P0116:00 | Engine Coolant Temperature Sensor 1 Circuit Range/Performance: No Sub Type Information | Sets when the PCM detects the engine coolant temperature or cylinder head temperature value is higher than the calibrated value and could prevent one or more OBD monitors from completing. The PCM runs this logic after an engine off and a calibrated soak period (typically 6 hours). This soak period allows the intake air temperature and the engine coolant temperature or cylinder head temperature to stabilize and not differ by greater than a calibrated value. This DTC sets when all of the following conditions are met: The engine coolant temperature at engine start exceeds the intake air temperature at engine start by greater than a calibrated value, typically 17°C (30°F). The engine coolant temperature exceeds a calibrated value, typically 107°C (225°F). The fuel system, heated oxygen and misfire monitors have not completed. The calibrated time to set this DTC has expired. Make sure the intake air temperature and the engine coolant temperature or cylinder head temperature are similar when the engine is cold. Also make sure the ECT or CHT sensor and the actual engine operating temperatures are the same. |
| PCM P0117:00 | Engine Coolant Temperature Sensor 1 Circuit Low: No Sub Type Information | Sets when the PCM detects the ECT circuit voltage is less than 0.2 volt. An ECT1 PID reading less than 0.2 volt with ignition ON, engine OFF or during any engine operating mode indicates a concern is present. |
| PCM P0118:00 | Engine Coolant Temperature Sensor 1 Circuit High: No Sub Type Information | Sets when the PCM detects the ECT circuit voltage is greater than 4.6 volts. The presence of this DTC may indicate the vehicle is operating in derate mode and may experience a loss of power. After repair, the vehicle may still display a system warning message. Drive the vehicle until the system warning message has cleared from the IPC message center. An ECT1 PID reading greater than 4.6 volts with the ignition mode ON, engine OFF or during any engine operating mode indicates a concern is present. |
| PCM P0128:00 | Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature): No Sub Type Information | Sets when the PCM detects the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine. |
| PCM P1116:00 | Engine Coolant Temperature Sensor Out Of Self Test Range: No Sub Type Information | Sets when the PCM detects the ECT sensor is out of self-test range. The self-test range is greater than 0.3 volts and less than 3.7 volts. |
Possible Sources
- ECT circuitry concern
- CHT sensor circuitry concern
- Cooling system concern
- ECT or cylinder head temperature (CHT) sensor
- ECT sensor (12A648)
- Secondary cooling system engine coolant temperature sensor (12A648)
PINPOINT TESTS K: ENGINE COOLANT TEMPERATURE (ECT) SENSOR (Diesel)