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Home >> Chevrolet >> 2000 >> Blazer 2D Utility, 4WD, Part Time, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 4.3L >> Diagnostic Tests >> DTC P0125: Engine Coolant Temperature Excessive Time To Enter Closed Loop Fuel Control >> Diagnostic Procedures

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 cooling system coolant level. Repair as necessary. If cooling system is okay, go to next step.
  3. Allow vehicle to cool completely. Operate vehicle within the conditions for setting this DTC. If ECT value increases steadily to greater than 68°F (20°C) in 2-5 minutes, see DIAGNOSTIC AIDS . If ECT value does not increases steadily to greater than 68°F (20°C) in 2-5 minutes, go to next step.
  4. Using a thermometer, compare actual coolant temperature with ECT displayed on scan tool. If temperatures are close to same value, check for faulty thermostat. If temperatures are not close to same value, go to next step.
  5. Replace ECT sensor. After replacing sensor, go to next step.
  6. Using scan tool, clear DTCs. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, and then enter this DTC. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, go to step  2.
  7. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTCs are displayed, go to applicable DTC test. If no undiagnosed DTCs are displayed, system is okay.
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