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.
Monitor Scan Tool Data
- Connect scan tool to data link connector (DLC).
- Engine "ON"
- Monitor the "Driver Air Mix Potentiometer" Parameter on the Scan Tool while operating temp, switch.
- Is the DTC B2406 present and is parameter of "Driver Air Mix Potentiometer" fixed?
* There is any fault in Driver Air Mix Motor. If the parameter of "Driver Air Mix Door" is 30% or less when the actuator operates to the hot position, or If the parameter is 60% and more when the actuator operates to the cold position.
YES
- Go to "INSPECTION " procedure.
NO
- The electrical systems are made up of many harness and connectors. Many kinds of fault are caused by poor connection of sensors and terminals. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.