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.
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HOMESERVICE MANUALSBMW1992850I AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SELF DIAGNOSTICSCOMPONENT TESTSDME MAIN RELAYPOSSIBLE CAUSES
1992 BMW 850i Automatic
Possible Causes
1992 BMW 850i AutomaticSECTION Possible Causes
- Wire to DME control unit pin No. 27 defective.
- Relay or voltage supply not okay.
- Voltage supply for DME control unit not okay.
- Control unit is defective if no ground potential is output at control unit pin No. 27 (display: OFF) although the above points are okay.
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.