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 P034, Map Sensor Signal Too High: Action
PCM turns on MIL. PCM uses a substitute MAP sensor value based on engine RPM and throttle position switch status. PCM disables long term fuel trim. PCM disables EVAP canister solenoid. PCM disables torque management and transaxle shift adapts are maintained at current levels.
- MAP at idle should be 30-50 kPa, depending on engine load. BARO pressure should be 85-105 kPa, depending upon altitude.
- Check for vacuum at fuel pressure regulator hose. At idle, typical vacuum reading should be 14-20 in. Hg, depending on engine load.
- PCM data PD02 should read 10-16 kPa MAP sensor connector disconnected. If PD02 reads greater than 16 kPa, check circuit No. 432 for short to voltage.
- Checks for short to voltage inside intake manifold.
- Checks for short to voltage on circuit No. 452 or 474. Also checks for high resistance on circuit No. 452. Ensure transaxle temperature sensor connector is disconnected to eliminate voltage.
NO RELATED
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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.