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.
Code 33, Map Sensor Signal Volt Hi: Notes
If MAP sensor fails, ECM will substitute a fixed MAP value and use TPS sensor to control fuel delivery.
- This test confirms Code 33 and determines if the fault is the result of a hard failure and/or intermittent condition. Code 33 will set when MAP signal voltage is too high, TPS is less than 2 percent and these conditions have been met for more than 5 seconds.
- This step simulates conditions for a Code 34. If the ECM recognizes and sets Code 34 (low MAP signal), ECM and circuits No. 474 and 432 are not at fault.
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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.
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