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 GSE, AutomaticFACTORY OEM SERVICE PROCEDURE
Power Circuit
- With ignition off, disconnect ECM connectors. With ignition switch in the ON position, check for battery voltage between ECM terminal connector A6 (Red/White/Black wire) and ground.
- If battery voltage is not present, check fuse No. F10 (20-Amp) in fuse panel. See Fig 1 . If fuse is okay, check for an open in Red/White/Black wire between fuse panel and ECM terminal connector A6. If wire okay, check for defective ignition switch.
Factory Service Tools
Use the Manual With the Right Hardware
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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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