P0118

DTC 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.

CAUTION: Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.




On Board Diagnosis Logic




FAIL-SAFE MODE
When this malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.

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.

WITH CONSULT-II
1. Turn ignition switch ON.




2. Select DATA MONITOR mode with CONSULT-II.
3. Wait at least 5 seconds.
4. If DTC is detected, go to "Diagnostic Procedure"

WITH GST
Follow the procedure WITH CONSULT-II above.

EC-ECTS-01:

Wiring Diagram

Diagnostic Procedure (Steps 1 - 2):

Diagnostic Procedure (Steps 3 - 6):

Diagnostic Procedure

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.