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DTC Diagnosis Procedure
1.CHECK ENGINE COOLANT TEMPERATURE SENSOR POWER SUPPLY
  1. Turn ignition switch OFF.
  2. Disconnect engine coolant temperature (ECT) sensor harness connector.
  3. Turn ignition switch ON.
  4. Check the voltage between ECT sensor harness connector and ground.
    +−Voltage
    (Approx.)
    ECT sensor
    ConnectorTerminal
    F611Ground5 V
Is the inspection result normal?
.
.
 
2.CHECK ENGINE COOLANT TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check the continuity between ECT sensor harness connector and ECM harness connector.
    +−Continuity
    ECT sensorECM
    ConnectorTerminalConnectorTerminal
    F611F52101Existed
  4. Also check harness for short to ground.
Is the inspection result normal?
Perform the trouble diagnosis for power supply circuit.
Repair or replace error-detected parts.
 
3.CHECK ENGINE COOLANT TEMPERATURE SENSOR GROUND CIRCUIT
  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check the continuity between ECT sensor harness connector and ECM harness connector.
    +−Continuity
    ECT sensorECM
    ConnectorTerminalConnectorTerminal
    F612F52102Existed
  4. Also check harness for short to ground to power.
Is the inspection result normal?
.
Repair or replace error-detected parts.
 
4.CHECK ENGINE COOLANT TEMPERATURE SENSOR
Check the engine coolant temperature sensor. Refer to Component Inspection.
Is the inspection result normal?
Check intermittent incident. Refer to Intermittent IncidentIntermittent Incident.
Replace engine coolant temperature sensor. Refer to Exploded View.