LEMON Manuals: Even more car manuals for everyone
Home >> Pontiac >> 2000 >> Firebird Formula, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 5.7L >> 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 DTCs are set, go to applicable DTC test. If no ECT DTCs are set, go to next step.
  3. Turn ignition on. Disconnect ECT sensor. If scan tool indicates ECT value is less than -31°F (-35°C), go to next step. If scan tool does not indicate ECT value less than -31°F (-35°C), diagnose using test for DTC P0117. See DTC P0117: ECT SENSOR CIRCUIT LOW VOLTAGE .
  4. Using a fused jumper wire, jumper terminals of ECT sensor harness connector together. If scan tool indicates ECT value is greater than 282°F (139°C), go to next step. If scan tool does not indicate ECT value greater than 282°F (139°C), diagnose using test for DTC P0118. See DTC P0118: ECT SENSOR CIRCUIT HIGH VOLTAGE .
  5. Reconnect ECT sensor. Start engine and let idle for 5 minutes. If scan tool indicates ECT value is at least 93°F (34°C), check cooling system operation. If scan tool does not indicate ECT value is at least 93°F (34°C), go to next step.
  6. Check resistance of ECT sensor. See appropriate SENSOR OPERATING RANGE CHARTS article. If ECT sensor resistance is within specifications, go to next step. If ECT sensor is not within specifications, go to step  8.
  7. Check coolant condition, coolant level, thermostat operation and cooling fan operation. Repair as necessary. After repairs, go to step  9.
  8. Replace ECT sensor. After replacing sensor, go to next step.
  9. 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.
  10. 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.
scientia non olet · About LEMON Manuals