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.
2011 Toyota Avalon BaseFACTORY OEM SERVICE PROCEDURE
Check Mode Procedure
- DESCRIPTION
- Check mode has a higher sensitivity to malfunctions and can detect malfunctions that normal mode cannot detect. Check mode can also detect all the malfunctions that normal mode can detect. In check mode, DTCs are detected with 1-trip detection logic.
- CHECK MODE PROCEDURE
- Make sure that the items below are satisfied:
- Battery positive voltage is 11 V or more
- Throttle valve is fully closed
- Transaxle is in the P or N position
- A/C is switched OFF
- Turn the ignition switch off.
- Connect Techstream to the DLC3.
- Turn the ignition switch on (IG).
- Enter the following menus: Powertrain / ECT / Utility / Check Mode.
- Change the TCM to check mode. Make sure that the MIL flashes as shown in the illustration.
- Make sure that the items below are satisfied:
Factory Service Tools
Use the Manual With the Right Hardware
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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.