If your OBDII scan shows “not ready” for Catalyst and Evap systems, a specific drive cycle might solve the problem. Here’s a potential solution for a Toyota MR2 with a 2AZ-FE engine:
Toyota MR2 (2AZ-FE) Drive Cycle for OBDII Readiness
This drive cycle aims to reset the OBDII monitors. Follow these steps carefully:
Preparation:
- Ensure your fuel tank is between ¼ and ¾ full.
- Clear any existing diagnostic trouble codes (DTCs).
- Start with a cold engine.
Drive Cycle Steps:
-
Idle: Start the engine and let it idle for at least 10 minutes.
-
Highway Driving: Drive at a consistent speed between 43-56 mph for 3-5 minutes, maintaining engine speed between 900-3200 RPM.
-
Idle: Stop and let the engine idle for 3-5 minutes.
-
Repeat: Repeat steps 2 and 3 once.
-
Moderate Driving: Drive at 40-55 mph for 3 minutes.
-
City Driving: Drive at 35-45 mph for 7 minutes.
-
Engine Off and Fuel Cap Release: Stop the vehicle, turn off the engine, and release fuel tank pressure by removing and reinstalling the fuel cap.
-
Steady Driving: Restart the engine and immediately drive at approximately 45 mph for 5 minutes.
-
Stop-and-Go Driving: Drive at approximately 25 mph for 15 minutes, incorporating at least two 30-second stops.
-
Idle: Stop and let the engine idle for 2 minutes.
-
Short Drive and Idle (Repeated): Drive at 25 mph or more for at least 50 seconds, ensuring engine speed stays above 900 RPM. Then, stop and idle for at least 40 seconds. Repeat this process ten times.
Important Notes:
- If the monitors still aren’t ready after completing the cycle, ensure all preconditions are met (no DTCs, proper fuel level). Turn the ignition off, then repeat the entire drive cycle.
- Consult your vehicle’s repair manual for the most accurate drive cycle information specific to your year and model. This generic cycle may not work for all Toyota MR2s.
- This process can help prepare your vehicle for a smog inspection by allowing the onboard diagnostic system to complete its self-tests.
Conclusion
Completing the correct drive cycle is crucial for setting your OBDII monitors to “ready.” While this guide provides a potential solution for a Toyota MR2 (2AZ-FE), always refer to your vehicle’s specific repair manual for the most accurate information. If you continue to experience issues, consult a qualified automotive technician.
