P0117

DTC P0117, P0118 ECT SENSOR




Component Description
The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.






On Board Diagnosis Logic






FAIL-SAFE MODE






DTC Confirmation Procedure

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

1. Turn ignition switch ON and wait at least 5 seconds.
2. Check DTC.
3. If DTC is detected, go to "Diagnostic Procedure" below.

Wiring Diagram

EC-ECTS-01:

Diagnostic Procedure

Step 1:

Step 1 (Continued)-3:

Step 4-5:

Component Inspection

ENGINE COOLANT TEMPERATURE SENSOR




1. Check resistance between engine coolant temperature sensor terminals 1 and 2 as shown in the figure.






2. If NG, replace engine coolant temperature sensor.