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Home >> Chevrolet >> 2000 >> Venture Plus >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P0125: Engine Coolant Temperature Excessive Time To Enter Closed Loop Fuel Control >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Check if any ECT related DTCs are set. Diagnose affected DTC(s) 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 ECT 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 about 284°F (140°C), go to next step.
  4. Check ECT sensor circuit for high resistance, poor connections at ECT sensor and PCM connectors. Repair as necessary. After repairs, go to next step. If circuit or connections are okay, go to step  7.
  5. Replace faulty terminals or faulty wiring 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 down until ECT and IAT sensor parameters are within 5 degrees of each other. Using scan tool, clear DTCs. Start and operate engine at idle. Monitor ECT parameter. If ECT parameter increases to greater than 14°F (-10°C) within 9 minutes, system is okay. If ECT parameter does not increase to greater than 14°F (-10°C) within 9 minutes, go to step  2.
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