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 DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANS1990-94 AUTOMATIC TRANSMISSION - ELECTRONIC CONTROLS - 8 SERIES
1992 BMW 850i Automatic
1990-94 Automatic Transmission - Electronic Controls - 8 Series
1992 BMW 850i AutomaticSECTION 1990-94 Automatic Transmission - Electronic Controls - 8 Series
- Description & Operation
- Component Locations
- Self-Diagnostic System
- Diagnostic Tests
- Notes
- DTC 1: Transmission Relay
- DTC 2: Check Sum EPROM
- DTC 3: KICKDOWN Switch
- DTC 4: Program Switch
- DTC 5: Throttle Valve Signal, Accelerator Pedal Signal
- DTC 6: Solenoid Valve MV1
- DTC 7: Solenoid Valve MV2
- DTC 8: Solenoid Valve MV1, Solenoid Valve MV2
- DTC 9: Lifting Magnet P/N Lock
- DTC 10: Solenoid Valve MV1, Lifting Magnet P/N Lock
- DTC 11: Solenoid Valve MV2, Lifting Magnet P/N Lock
- DTC 12: Solenoid Valve MV1, Solenoid Valve MV2, Lifting Magnet P/N Lock
- DTC 13: Converter Lockup Clutch Solenoid
- DTC 14: Solenoid Valve MV1 Or MV-Wk
- DTC 15: Solenoid Valve MV2 Or MV-Wk
- DTC 16: Solenoid Valve MV1, Solenoid Valve MV2, Solenoid Valve MV-Wk
- DTC 17: Lifting Magnet P/N Lock, MV-Wk
- DTC 18: Solenoid Valve MV1, Lifting Magnet P/N Lock, MV-Wk
- DTC 19: Solenoid Valve MV2, Lifting Magnet P/N Lock, MV-Wk
- DTC 20: Power Supply For MV & Dr
- DTC 21: Engine Speed Signal Tr
- DTC 22: Pressure Regulator Dr
- DTC 23: Ignition Timing Tap
- DTC 24: Speed Sensor N-Ab, Downshift Protection
- DTC 25: OVERREV Guard
- DTC 26: Injection Signal Ti
- DTC 27: Speed Sensor Or Torque Converter
- DTC 28: Fault Display
- DTC 29: Check Sum Program Island
- DTC 30: Battery Voltage
- DTC 31: Selector Lever
- DTC 200: No Kick-Down Shifts Are Performed
- DTC 201: Only Kick-Down Shifts Are Performed
- DTC 202: S-Program Cannot Be Switched
- DTC 203: M-Program Cannot Be Switched
- DTC 204: No Program Switchover
- DTC 205: No Engine Intervention
- DTC 206: Incorrect Fault Display
- DTC 300: Diagnostic Link Defective
- DTC 301: Voltage Supply To Control Unit Defective
- DTC 302: Selector Lever Position
- DTC 303: Selector Lever Position Not Detected
- Component Tests
- Connector Identification
- Pin Voltage Tests
- Wiring Diagrams
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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.