Toyota
Nissan Versa
 Sedan Service Manual
Engine » Engine control system (EC) » P0117, P0118 ECT sensor
Diagnosis Procedure

1.CHECK GROUND CONNECTION

  1. Turn ignition switch OFF.
  2. Check ground connection E. Refer to Ground Inspection in GI, "Circuit Inspection".

Is the inspection result normal?

YES >> GO TO 2.

NO >> Repair or replace ground connection.

2.CHECK ECT SENSOR POWER SUPPLY CIRCUIT

  1. Disconnect engine coolant temperature (ECT) sensor harness connector.
  2. Turn ignition switch ON.
  3. Check the voltage between ECT sensor harness connector and ground.

CHECK ECT SENSOR POWER SUPPLY CIRCUIT

Is the inspection result normal?

YES >> GO TO 3.

NO >> Repair open circuit or short to ground or short to power in harness or connectors.

3.CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check the continuity between ECT sensor harness connector and ECM harness connector.

CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

    4.   Also check harness for short to ground and short to power.

Is the inspection result normal?

YES >> GO TO 4.

NO >> Repair open circuit or short to ground or short to power in harness or connectors.

4.CHECK ENGINE COOLANT TEMPERATURE SENSOR

Refer to GI, "Circuit Inspection".

Is the inspection result normal?

YES >> GO TO 5.

NO >> Replace engine coolant temperature sensor. Refer to CO, "Exploded View".

5.CHECK INTERMITTENT INCIDENT

Refer to GI, "Intermittent Incident".

>> INSPECTION END

Component Inspection

1.CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR

  1. Turn ignition switch OFF.
  2. Disconnect ECT sensor harness connector.
  3. Remove ECT sensor.
  4. Check resistance between ECT sensor terminals by heating with hot water as shown in the figure.

CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR

CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR

Is the inspection result normal?

YES >> INSPECTION END

NO >> Replace engine coolant temperature sensor. Refer to CO, "Exploded View".

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