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
Diagnostic Circuit
- Locate 19-pin diagnostic connector underneath cover in front passenger's footwell. Use DVOM to check wiring harness (circuit) continuity between pin No. 7 (Orange/Blue wire) of 19-pin diagnostic connector and DME control unit terminal No. 13. See Figure .
- Use DVOM to check wiring harness (circuit) continuity between pin No. 8 (Orange/White wire) of 19-pin diagnostic connector and DME control unit terminal No. 55. If circuit continuity does not exist, check wiring harness for open circuits or circuits shorted to ground. If circuit continuity is okay, go to next step.
- Use DVOM to check voltage at pin No. 7 (Orange/Blue wire) of 19-pin diagnostic connector. Repeat voltage check at pin No. 8 (Orange/White wire) of 19-pin diagnostic connector. Voltage readings must be greater than 8 volts with ignition on. If voltage is not as specified, check wiring harness for open/short circuits. 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.