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
Power Circuits
- Disconnect DME control unit connector. Connect DVOM between terminal No. 24 (ground) and terminal No. 18 (battery voltage; keep-alive memory). See Figure . DVOM should indicate battery voltage. If battery voltage is not present, check Red wire back to fuse block and battery, or Brown ground wire. SeeWIRING DIAGRAMS article in the ENGINE PERFORMANCE Section.
- Connect DVOM between terminal No. 24 (ground) and terminal No. 37 (ignition signal from DME relay). See Figure
. Turn ignition on. DVOM should indicate battery voltage. If battery voltage is not present, check Gray/Brown wire back to DME relay, or Brown ground wire. See WIRING DIAGRAMS
article in the ENGINE PERFORMANCE Section.NOTE: On vehicles equipped with anti-theft system, check power supply from ignition lock to terminal No. 86 of DME relay via the anti-theft system control unit. See WIRING DIAGRAMS 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.