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Home >> Chevrolet >> 2003 >> Venture Base, Van Cargo Extended >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0125: Excessive Time To Enter Closed Loop Fuel Control >> Diagnostic Procedures

Diagnostic Procedures

  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
    2. NOTE: The cooling fans are commanded ON when certain engine coolant temperature DTCs are set.
  2. Is the cooling system low on coolant? If yes, locate and repair source of coolant loss and refill system. If no, go to next step.
  3. Test and verify the proper operation of the thermostat. Did you find and correct the condition? If yes, go to step  14. If no, go to next step.
  4. Disconnect the ECT sensor. Inspect for corrosion on the ECT sensor terminals. Inspect for improper or corroded terminals at the ECT harness connector. Inspect for loose terminals in the ECT harness connector. Did you find and correct the condition? If yes, go to step  14. If no, go to next step.
  5. Measure the voltage from the signal circuit of the ECT sensor to a good ground with a DVOM. Is voltage within 4.8-5.2 volts? If yes, go to next step. If no, go to step  8.
  6. Measure the voltage from the signal circuit of the ECT sensor to the low reference circuit of the ECT sensor with a DVOM. Is voltage within 4.8-5.2 volts? If yes, go to step  9. If no, go to next step.
  7. Test the ECT sensor low reference circuit for high resistance. Did you find and correct the condition? If yes, go to step  14. If no, go to step  11.
  8. Test the ECT sensor signal circuit for high resistance. Did you find and correct the condition? If yes, go to step  14. If no, go to step  11.
  9. Test the ECT sensor signal circuit for high resistance. Did you find and correct the condition? If yes, go to step  14. If no, go to step  11.
  10. Install ECT sensor. See REMOVAL & INSTALLATION - MONTANA, SILHOUETTE & VENTURE article. After installing sensor, check for an intermittent problem. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 3.4L MONTANA, SILHOUETTE & VENTURE article.
  11. Test for an intermittent and for a poor connection at the PCM. Did you find and correct the condition? If yes, go to step  14. If no, go to step  13.
  12. Replace ECT sensor. See REMOVAL & INSTALLATION - MONTANA, SILHOUETTE & VENTURE article. After repairs, go to next step.
  13. Replace PCM. See REMOVAL & INSTALLATION - MONTANA, SILHOUETTE & VENTURE article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  14. Clear the DTCs with a scan tool. Turn ignition off for 30 seconds. Start engine. Operate the vehicle within the Conditions for Running DTC. See CONDITIONS FOR SETTING DTC . Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  15. Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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