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.
1990 Pontiac LeMans BaseFACTORY OEM SERVICE PROCEDURE
Park/Neutral (P/N) Switch
- Disconnect P/N switch connector which is located near the battery. Check continuity between terminals "A" (Black/White wire) and "B" (Red/Yellow/Black wire). See Fig 1 .
- There should be continuity between the terminals in Park and Neutral. Switch should be open in all other selector positions. Perform wiggle test on selector lever when in "D" position to ensure switch is adjusted properly and a short does not exist.
CAUTION:
If vehicle is operated with P/N switch disconnected, idle quality will be affected and a false diagnostic Code 24 may be set in ECM memory.
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.