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Home >> Pontiac >> 2000 >> Firebird Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0125: ECT Excessive Time To Enter Closed Loop Fuel Control >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. If any ECT related DTCs are set, diagnose affected DTC before proceeding. If no ECT related DTCs are set, go to next step.
  3. Turn ignition off. Disconnect ECT sensor harness connector. Using a fused jumper wire, jumper sensor harness connector terminals. Turn ignition on, with engine off. Using scan tool, observe ECT parameter. If ECT parameter is about 284°F (140°C), go to step  6. If ECT parameter is not 284°F (140°C), go to next step.
  4. Check for high resistance in wiring related to ECT sensor. Check for poor connections at ECT sensor and PCM. If problem is found, go to next step. If no problem is found, go to step  7.
  5. Repair as necessary. After repairs, go to step  8.
  6. Replace ECT sensor. After replacing sensor, go to next step.
  7. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  8. Allow engine to cool completely until ECT and IAT sensor parameters are within 5 degrees of each other. Using scan tool, clear DTCs. Start and operate engine at idle. Using scan tool, monitor ECT parameter. If temperature increases to greater than 14°F (-10°C) within 9 minutes, system is okay. If specified temperature is not reached within 9 minutes, go to step  2.
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