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Home >> Pontiac >> 2001 >> Aztek Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Inspection/Maintenance Procedures >> Inspection/Maintenance Evaporative Emission System Set Procedure >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform I/M system check. See INSPECTION/MAINTENANCE SYSTEM CHECK . After performing I/M system check, go to next step.
  2. Using a scan tool, select SPECIAL FUNCTIONS. Determine if vehicle is equipped with a SERVICE BAY TEST for EVAP system. If vehicle equipped with EVAP SERVICE BAY TEST, go to next step. If vehicle is not equipped with EVAP SERVICE BAY TEST, go to step  5.
  3. Ensure vehicle is within enable criteria. Turn off all of accessories. Following directions on scan tool, perform EVAP SERVICE BAY TEST. If EVAP system passed SERVICE BAY TEST, go to step  8. If EVAP system did not pass SERVICE BAY TEST, go to next step.
  4. Observe scan tool SERVICE BAY TEST for an indication of why test did not pass (e.g., failed DTC, test aborted, etc.). Refer to appropriate service information for diagnosis and repair of condition as necessary. After repairs, perform INSPECTION/MAINTENANCE SYSTEM CHECK .
    5. NOTE: Once engine is started, DO NOT turn engine off for remainder of procedure until test is complete.
  5. Ensure vehicle is within enable criteria. Turn off all of accessories. Start and operate engine at idle. Operate vehicle in the following conditions:
    • Accelerate at part throttle to 45 MPH. Maintain this speed until engine reaches operating temperature. This may be up to 8-10 minutes depending on start-up coolant temperature.
    • Continue operating for an additional 3 minutes after engine reaches operating temperature, or until I/M SYSTEM STATUS indicator updates to YES.
    If EVAP SYSTEM STATUS updates to YES, go to step  8. If EVAP SYSTEM STATUS did not update to YES, go to next step.
  6. 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.
  7. Using scan tool, observe NOT RAN SINCE CODE CLEARED display to determine whether DTCs P0440, P0442, P0446 and P1441 have run. For those DTCs that have not run, see CODE ENABLE CRITERIA under appropriate DTC under DIAGNOSTIC TESTS. Operate vehicle to meet code enable criteria until DTCs runs. Using scan tool, observe I/M SYSTEM STATUS display. If EVAP SYSTEM STATUS updates to YES, go to next step. If EVAP SYSTEM STATUS does not update to YES, see DIAGNOSTIC AIDS .
  8. Using scan tool, check for DTCs. If scan tool indicates any DTCs are set, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are displayed, system is okay.
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