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.
1992 Cadillac Seville STSFACTORY OEM SERVICE PROCEDURE
Pcm Code E031, Shorted Map Sensor Circuit: Action
PCM turns on SERVICE ENGINE SOON light, sets BARO equal to 92 kPa and uses a substitute MAP sensor value based on engine RPM and throttle switch status (open or closed).
NOTE:
Test numbers refer to numbers on diagnostic chart.
- If PCM parameter ED02 goes to 14-16 kPa with sensor unplugged, fault is at MAP sensor or sensor connector.
- This checks for an open circuit from terminal "A" of sensor connector to PCM terminal A5 (ground). If ground is open, sensor cannot divide reference voltage to make signal voltage vary. Signal voltage is always high.
Factory Service Tools
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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.