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Home >> Chevrolet >> 2001 >> Chevy Express G3500, Van Cargo Extended, 6.5 F >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 6.5L >> Inspection/Maintenance Procedures >> Inspection/Maintenance Misfire Monitoring System Set Procedure >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform the I/M system check. See INSPECTION/MAINTENANCE SYSTEM CHECK . After performing I/M system check, go to next step.
  2. Ensure engine coolant temperature is 133-219°F (56-104°C). Set parking brake. Ensure transmission is in Park (A/T) or Neutral (M/T). Turn all of accessories off (e.g. A/C, blower fan, etc.). Start and operate engine at idle. Allow engine to idle for 2 minutes or until I/M System Status indicator updates to YES. If status updates to YES, go to step  5. If status does not update to YES, go to next step.
  3. Using scan tool, observe DTC information. If scan tool indicates any failed DTCs, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not indicate any failed DTCs, go to next step.
  4. Using scan tool, observe the NOT RAN SINCE CODE CLEARED display. Determine which of the DTCs required for a YES status has not run. Enter DTC number in the Specific DTC menu of scan tool. Ensure engine coolant temperature is 133-219°F (56-104°C). Repeat procedure until scan tool indicates that diagnostic test has run. Repeat this step or any additional required DTCs that have not run. Observe I/M System Status display on scan tool. If Misfire Monitoring System Status updates to YES, go to next step. If Misfire Monitoring System Status does not update to YES, see DIAGNOSTIC AIDS .
  5. Using scan tool, observe emission related DTC portion of I/M System Status display. If scan tool indicates any emission related DTCs, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not indicate emission related DTCs, system is okay.
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