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 P031, Shorted Map Sensor Circuit: Action
PCM turns on MIL, disables long term fuel trim and uses a substitute MAP sensor value based on engine RPM and throttle switch status (open or closed). PCM disables torque management and transaxle shift adapts are maintained at current levels.
- If Code P038 is set, check circuit No. 452 for open or short to voltage. MAP and IAT sensors share this same circuit.
- PD02 will read 103-105 kPa if MAP sensor or circuit is shorted.
- If PCM data PD02 goes to 10-16 kPa with connector unplugged, check for faulty sensor or circuit.
- Checks circuit No. 432 for short to battery. If circuit is okay, replace PCM.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.