*CHECKING THE ENGINE COOLANT TEMPERATURE SENSOR CALIBRATION

For a complete wiring diagram Refer to Section 8W



Possible Causes
  
ECT SENSOR - COLD
  
ECT SENSOR - HOT
  



Diagnostic Test

1.ECT SENSOR - COLD

NOTE: The thermostat must be operating correctly for this test to be valid.




NOTE: The engine temperature should be below 50°C (120°F).



Are the readings within 7°C (13°F) of each other?

Yes
  • Go To2


No
  • Check the wiring and connectors associated with the ECT Sensor for corrosion, damage or other problems. Repair as necessary. If wiring and connectors are o.k., replace the Engine Coolant Temperature Sensor.
  • Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

2.ECT SENSOR - HOT

NOTE: The thermostat must be operating correctly for this test to be valid.







Are the readings within 7°C (13°F) of each other?

Yes
  • Test Complete.


No
  • Check the wiring and connectors associated with the ECT Sensor for corrosion, damage or other problems. Repair as necessary. If wiring and connectors are o.k., replace the Engine Coolant Temperature Sensor.
  • Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)