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 Porsche 911 AmericaFACTORY OEM SERVICE PROCEDURE
CHECK ENGINE Light Control Circuit (1991 Models)
- Disconnect DME control unit connector. See Figure . Check the CHECK ENGINE light control circuit by grounding DME control unit wiring harness connector terminal No. 22 and turning ignition on.
- If CHECK ENGINE light fails to come on, check bulb and wiring harness (circuit) between DME control and instrument cluster. See WIRING DIAGRAMS
article in the ENGINE PERFORMANCE Section.NOTE: If CHECK ENGINE light control circuit is faulty, a fault code may be stored in memory. See G - TESTS W/ CODES article in the ENGINE PERFORMANCE Section.
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.