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Home >> Chevrolet >> 2001 >> Metro >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 1.3L >> Diagnostic Tests >> DTC P0116: ECT Sensor Performance >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing powertrain diagnostic system check, go to next step.
  2. Using scan tool, check if DTC P0117 or P0118 is set. If DTC P0117 is set, diagnose DTC. See DTC P0117 . If DTC P0118 is set, diagnose DTC. See DTC P0118 . If DTC P0117 or P0118 is not set, go to next step.
  3. Measure actual engine coolant temperature. Using scan tool, monitor ECT sensor parameter. If scan tool display value is near actual engine coolant temperature, go to step  11. If scan tool display value is not near actual engine coolant temperature, go to next step.
  4. Disconnect ECT sensor harness connector. Using scan tool, monitor ECT sensor parameter. If ECT sensor value is -40°F (-40°C), go to next step. If ECT sensor value is not -40°F (-40°C), go to step  8.
  5. Using a fused jumper wire, jumper ECT sensor harness connector terminals. Using scan tool, monitor ECT sensor parameter. If ECT sensor value is 246°F (119°C), go to step  13. If ECT sensor value is not 246°F (119°C), go to next step.
  6. Using fused jumper wire, connect ECT sensor harness connector terminal No. 2 (Gray wire) to ground. Using scan tool, monitor ECT sensor parameter. If ECT sensor value is 246°F (119°C), go to next step. If ECT sensor value is not 246°F (119°C), go to step  8.
  7. Turn ignition off. Repair open or high resistance in Green/Black wire between ECT sensor harness connector terminal No. 3 and PCM harness connector C2 terminal No. 9. See Figure. After repairs, go to step  14. If circuit is okay, go to step  9.
  8. Turn ignition off. Disconnect PCM harness connector C2. Check for short or high resistance in Gray/White wire between ECT sensor harness connector terminal No. 1 and PCM harness connector C2 terminal No. 10. Repair as necessary. After repairs, go to step  14. If circuit is okay, go to next step.
  9. Check for poor connections at PCM and ECT sensor harness connectors. Repair as necessary. After repairs, go to step  14. If circuit is okay, go to next step.
  10. Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After replacing PCM, go to step  14.
  11. Turn ignition off. Inspect engine cooling system for a faulty thermostat, low coolant level, incorrect coolant, or faulty cooling system operation. Repair as necessary. After repairs, go to step  14. If cooling system is okay, go to next step.
  12. Turn ignition on, with engine off. Using scan tool, clear DTC information. Using scan tool, place vehicle into check mode. Operate vehicle within FREEZE FRAME/FAILURE RECORDS data conditions to set DTC P0116. If DTC resets, go to next step. If DTC does not reset, see DIAGNOSTIC AIDS .
  13. Turn ignition off. Replace ECT sensor. After replacing sensor, go to next step.
  14. Turn ignition on, with engine off. Using scan tool, clear DTC information. Operate vehicle within FREEZE FRAME/FAILURE RECORDS data conditions that set DTC. Check for DTCs. If no DTCs are stored, repair is complete. If any DTCs are stored, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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