LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Pontiac >> 2003 >> Aztek FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Drive Cycles >> Inspection/Maintenance Catalyst System Set Procedure >> Diagnostic Procedures
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Procedures

  1. Did you perform the Inspection/Maintenance (I/M) System Check? If yes, go to next step. If no, see INSPECTION/MAINTENANCE SYSTEM CHECK .
    2. WARNING: Road test a vehicle under safe conditions and while obeying all traffic laws. Do not attempt any maneuvers that could jeopardize vehicle control. Failure to adhere to these precautions could lead to serious personal injury and vehicle damage.
  2. Ensure the vehicle is within the Conditions for Running. See CONDITIONS FOR RUNNING . Turn OFF all of the accessories (e.g., A/C, blower fan, etc.). Start engine and allow to idle. For this test to run, vehicle must operate in the following conditions:
    • Accelerate at part throttle to 55 MPH with this speed maintained for 5 minutes.
    • Decelerate to zero MPH.
    • Engine idling for 2 minutes while the following criteria is maintained:
      1. Service brake depressed.
      2. Automatic transmission in Drive.

    With a scan tool, observe the I/M System Status display. Did the Catalyst System Status update to YES? If yes, go to step  5. If no, go to next step.

  3. With a scan tool, observe the DTC Information. Does the scan tool indicate any failed DTCs? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
  4. To determine which DTCs are required to run in order to complete this test, see INSPECTION/MAINTENANCE SYSTEM DTC TABLE . With scan tool, observe the Not Ran Since Code Cleared display. Determine which of the DTCs required for a YES status has not run. Enter the DTC number in the Specific DTC menu of the scan tool. Operate the vehicle within the Conditions for Running. See CONDITIONS FOR RUNNING . Repeat the procedure until the scan tool indicates the diagnostic test has run. Repeat procedure for any additional required DTCs that have not run. With a scan tool, observe the I/M System Status display. Did the Catalyst System Status update to YES? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  5. With a scan tool, observe the Emission Related DTC portion of the I/M System Status display. Does the scan tool indicate any Emission Related DTCs set? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
scientia non olet · About LEMON Manuals