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Home › Chevrolet › 2001 › Metro › Repair and Diagnosis › Engine Performance › System › Engine Controls Self-Diagnostics - 1.3L › Diagnostic Tests › DTC P0125: ECT Excessive Time To Enter Closed Loop › 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. Turn ignition off. Allow engine to cool to ambient temperature. Turn ignition on, with engine off. Using scan tool, compare ECT sensor temperature to IAT sensor temperature parameter. If temperature readings are close, go to next step. If temperature readings are not close, see DIAGNOSTIC AIDS .
  3. Start engine and allow to idle. Using scan tool, monitor ECT sensor parameter. If ECT sensor value increases to greater than 104°F (40°C) within 10 minutes, see DIAGNOSTIC AIDS . If ECT sensor value does not increase as specified, go to next step.
  4. If any ECT sensor DTCs are set, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If ECT sensor DTCs are not set, go to next step.
  5. Check coolant level and fill as necessary. If coolant was added to cooling system, go to step  10. If coolant level was okay, go to next step.
  6. Using scan tool, compare ECT temperature parameter with actual coolant temperature measured with a thermometer. If temperature readings are close, go to step  8. If temperature readings are not close, go to next step.
  7. Check for high resistance in ECT sensor wiring. Check for poor connections at ECT sensor and PCM harness connectors. Repair as necessary. After repairs, go to step  10. If circuits and connections are okay, go to step  9.
  8. Turn ignition off. Check cooling system. Repair as necessary. After repairs, go to step  10.
  9. Turn ignition off. Replace ECT sensor. Using scan tool, recheck ECT display. After repairs, go to next step.
  10. 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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