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.
3.4L & 3.8L
1994 Chevrolet Lumina BaseSECTION 3.4L & 3.8L
- Perform self-diagnostic procedures first. See appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section below. Turn ignition off. Disconnect PCM connectors. Turn ignition on. If MIL did not come on, go to next step. If MIL came on, repair short to ground in circuit No. 419 (Brown/White wire). If circuit is okay, check for faulty instrument panel.
- Check PROM for proper installation. If PROM is okay, replace PCM using original PROM. Reconnect PCM connectors. Install Tech 1 scan tester. Turn ignition on. Using scan tester, turn MIL off. If MIL turns off, system is okay. If MIL does not turn on, replace faulty PROM.
- G - TESTS W/CODES - 3.1L
- G - TESTS W/CODES - 3.4L
- G - TESTS W/CODES - 3.8L
RENDER: 1.0x
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.