P0118

Tests 1 - 3:

Tests 4 - 8:

Test 9:

SYMPTOM
P0118 - ENGINE COOLANT TEMPERATURE (ECT) SENSOR VOLTAGE TOO HIGH

WHEN MONITORED
With the ignition ON and battery voltage greater than 10.4 volts.

SET CONDITION
The Engine Coolant Temperature Sensor circuit voltage at the ECM goes above 4.98 volts for more than 2 seconds.

POSSIBLE CAUSES
- ECT sensor ground circuit open
- ECT sensor signal circuit open
- Engine coolant temperature sensor
- ECT sensor wiring harness intermittent defect
- ECT sensor wiring harness observable defect
- ECM (engine coolant temperature sensor)
- ECT sensor signal circuit shorted to voltage