After a dealership service campaign reset my car’s ECU, I failed smog due to incomplete Catalyst and Evap cycles. While the Evap cycle isn’t required to pass in my state, the Catalyst cycle is. A long drive didn’t solve the issue, so I purchased an Autel AutoLink AL319 OBD2 scanner from Walmart. This article outlines the drive cycle I followed using the Autel 319, enabling me to successfully complete the Catalyst cycle and pass smog.
Understanding the OBD2 Drive Cycle
An OBD2 drive cycle prepares your vehicle’s On-Board Diagnostics system for emissions testing. It involves a specific sequence of driving conditions that allow the system to monitor and evaluate various components, including the catalytic converter. It’s important to note that these cycles are condition-based, not mileage-based. My initial 200-mile drive proved ineffective. Following a specific procedure using the Autel Scanner 319 Walmart proved to be the solution.
The Drive Cycle Procedure
The drive cycle I used, found online, required strict adherence to specific steps:
- Preparation: Turn the ignition on for 30 seconds, check for Diagnostic Trouble Codes (DTCs) with your Autel scanner 319 walmart, and ensure the engine coolant temperature is below 140°F (60°C).
- Idling: Start the engine and let it idle for 2 minutes.
- Acceleration: Perform two light accelerations from 0 to 35 mph, two medium accelerations from 0 to 45 mph, and two hard accelerations from 0 to 55 mph. Maintain light, moderate, and heavy pedal pressure, respectively.
- Cruising: Maintain a steady 60 mph for 5 minutes, followed by 50 mph for 5 minutes, and finally 35 mph for 5 minutes. Crucial Note: During the 35 mph cruise, maintaining a speed above 35 mph is critical for successful completion. I targeted 37 mph using the Autel 319’s live data display.
- Final Idle: Let the engine idle for 2 minutes.
- DTC Check: Finally, check for any DTCs with your Autel scanner 319 walmart.
Important Considerations:
- Consistency: Adhere to the sequence precisely. While minor speed variations between steps didn’t seem detrimental, maintaining the specified speeds during the cruising phases is crucial.
- Continuous Monitoring: I kept the Autel AL319 plugged in throughout the drive cycle, allowing me to monitor progress in real time. The scanner beeps regularly while checking cycles, which some might find distracting.
- No Interruptions: Avoid turning off the car or using the air conditioner during the drive cycle.
Results and Conclusion
By following this drive cycle using my Autel scanner 319 walmart, I successfully completed the Catalyst monitor cycle on the first attempt. Although the Evap cycle remained incomplete, this wasn’t required for passing smog in my case. The Autel AutoLink AL319, purchased from Walmart, proved invaluable in monitoring and ensuring the successful completion of the drive cycle, ultimately enabling my car to pass its emissions test. The clear instructions, easy-to-read display, and real-time feedback made the entire process manageable. If you’re facing similar issues, an Autel scanner 319 from Walmart might be the solution for you.
