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 MANUALSBMW1992750ILREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SELF DIAGNOSTICS
1992 BMW 750iL
Engine Controls - Self Diagnostics
1992 BMW 750iLSECTION Engine Controls - Self Diagnostics
- Introduction
- Self-Diagnostic System
- Self-Diagnostics Feature
- Notes
- READ STATUS Diagnostic Function
- Injection Control
- Airflow Measurement
- Fuel Injection
- Catalytic Converter Protection Function (Ignition Circuit Monitoring)
- Overheating Protection Function
- Cold Start Control
- Fuel Evaporation Control For Models With Catalytic Converter
- Emission (Lambda) Control For Models With Catalytic Converter
- Adaptions
- Fuel Evaporation Control Adaption
- Idle Air Adaption
- Idle Mixture Adaption
- Part Load Mixture Adaption
- CO-Potentiometer
- Engine Speed Control
- EKP-Relay
- A/C Compressor Cut-Out
- Drlve-Away Protection
- Automatic Stability Control (ASC)
- Engine Drag Torque Control (MSR)
- Characteristics Map Changeover For EH Transmission
- EML Functions
- Self Diagnosis
- Testing Procedure
- Retrieving Diagnostic Trouble Codes
- Clearing Diagnostic Trouble Codes
- Control Unit Identification & Location
- Self-Diagnostics Feature
- Diagnostic Trouble Code Definitions
- Component Locations
- Connector Identification
- Diagnostic Tests
- Notes
- DTC 0: Undefined Fault
- DTC 1: Tr Signal/EKP Relay
- DTC 3: Fuel Injectors (Cylinders 2, 4, 6 & 8, 10, 12)
- DTC 8: Check Engine Light
- DTC 16: Ignition
- DTC 18: Final Stage Pin 18
- DTC 32: Fuel Injectors (Cylinders 1, 3, 5 & 7, 9, 11)
- DTC 36: Tank Venting Valve
- DTC 37: Sensor Heater Relay
- DTC 41: Air Mass Sensor (HLM)
- DTC 48: A/C Compressor Shutoff
- DTC 54: Control Unit Power Supply
- DTC 63: Converter Lockup Clutch
- DTC 64: Ignition Timing Tap
- DTC 70: Oxygen Sensor
- DTC 73: Road Speed Signal
- DTC 76: Idle Speed Co Potentiometer
- DTC 77: Intake Air Temperature Sensor
- DTC 78: Coolant Temperature Sensor
- DTC 82: Engine Drag Torque Control
- DTC 83: ASC
- DTC 100: Output Stage
- DTC 200: DME Control Unit
- DTC 201: Oxygen Control
- Component Tests
- Notes
- DME Control Unit
- Ignition Coil
- Tr Signal/EKP Relay
- Fuel Evaporation Valve
- Air Mass Sensor
- Pulse Generator/Engine Speed Position
- Pulse Generator - Cylinder Reference (Ignition)
- Check Engine Light
- Fuel Injector Valves
- Sensor Heating Relay
- Oxygen Sensor
- Emission Control
- Adaptions
- Co Potentiometer (Without Catalytic Converter)
- Road Speed Signal
- DME Main Relay
- Control Unit Supply Voltage
- Intake Air Temperature Sensor
- Engine Temperature Sensor
- Idle/Full Load Signal
- Component Resistance & Engine Performance Specifications
- Summary
- 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.