Pinpoint Test DX: Engine Coolant Temperature (ECT) Sensor
WARNING: This page is about a different variant/trim than selected.
NOTE:
Engine coolant temperature must be greater than 10 deg. C (50 deg. F) to pass the KOEO self-test and greater than 82 deg. C (180 deg. F) to pass the KOER self-test.
Refer to ELECTRONIC ENGINE CONTROLS - 2.3L for schematic and connector information.
Normal Operation and Fault Conditions
Refer to the DTC Fault Trigger Conditions.
Voltage values calculated for VREF equals 5 volts. These values may vary by 15% due to sensor and VREF variations.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| 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 correct range is 0.3 to 3.7 volts. The engine coolant temperature must be greater than 10 deg. C (50 deg. F) to pass the KOEO self-test and greater than 82 deg. C (180 deg. F) to pass the KOER self-test. |
| PCM P0117:00 | Engine Coolant Temperature Sensor 1 Circuit Low: No Sub Type Information | Sets when PCM detects the ECT sensor signal is less than the self-test minimum. The ECT sensor signal minimum is 121 deg. C (250 deg. F). A concern is present if the ECT (TEMP) PID reading is greater than 121 deg. C (250 deg. F) with the ignition ON engine OFF or during any engine operating mode. |
| PCM P0118:00 | Engine Coolant Temperature Sensor 1 Circuit High: No Sub Type Information | Sets when PCM detects the ECT sensor signal is greater than the self-test maximum. The ECT sensor signal maximum is -50 deg. C (-58 deg. F). A concern is present if the ECT (TEMP) PID reading is less than -50 deg. C (-58 deg. F) with the ignition ON engine OFF or during any engine operating mode. |
Possible Sources
- Low engine coolant
- Cooling system concern
- ECT or CHT sensor circuitry concern
- Coolant bypass valve
- Thermostat
- Ambient air temperature sensor
- CHT sensor
- ECT sensor (12A648)
- PCM (12A650)
PINPOINT TESTS DX: ENGINE COOLANT TEMPERATURE (ECT) SENSOR (Gas)