Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2001 Pontiac Aztek Base, AWDFACTORY OEM SERVICE PROCEDURE
Diagnostic Procedure
- Perform I/M system check. See INSPECTION/MAINTENANCE SYSTEM CHECK . After performing I/M system check, go to next step.
- Ensure vehicle is within the conditions for running this test. Turn off all accessories (e.g. A/C, blower fan, etc.). Start and operate engine at idle. In order for this test to run, vehicle must operate in the following conditions:
- Accelerate at part throttle to 45 MPH and maintain this speed for one minute.
- Make 4 decelerations of 25 seconds each from 45 MPH with throttle closed, no brake application, no manual downshift, with vehicle speed remaining at more than 25 MPH.
- After each deceleration period, return vehicle speed to 45 MPH under part throttle acceleration and maintain speed for 15 seconds.
- 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 other DTCs, go to next step.
- Using scan tool, observe Not Ran Since Code Cleared display. Determine if DTC P0401, P0404, P0405 or P1404 has not run. Enter DTC number in the Specific DTC menu of scan tool. Operate vehicle within the conditions for running the DTC. Repeat procedure until scan tool indicates that diagnostic test has run. Repeat for any additional DTCs that have not run. Observe I/M System Status display. If EGR system status updates to YES, go to next step. If EGR system status does not update to YES, see DIAGNOSTIC AIDS .
- Using scan tool, observe emission related DTC portion of I/M system status display. If scan tool indicates any emission related DTCs, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are set, system is okay.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.