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.
2002 BMW M3 2D ConvertibleFACTORY OEM SERVICE PROCEDURE
Engine Electrical System - Repair
- Troubleshooting
- 12 00 Contents of Engine Electrical System General
- 12 00 ... Instructions For Disconnecting And Connecting Battery
- 12 13 Notes On Checking Ignition System
- 12 00 ... Information On Working On Ignition System
- 12 00 ... Instructions For Removing And Installing Electronic Control Units
- 12 00 ... Instructions For Welding Work (Overload Protection Of Control Units)
- 12 00 ... Instructions For Connecting And Disconnecting Test Units
- 12 00 ... Instructions On Component Inspection
- 12 00 ... Instructions On Starting Aid
- 12 13 ... Fault In Fuel Injection System
- 12 13 ... Spark-Plug Faults
- 12 13 ... Ignition Coil Faults
- 12 13 ... Further Fault Patterns With Evaluation
- 12 13 ... Additional Fault Notes For Troubleshooting
- 12 13 ... Normal Oscillogram (M, S, W Engines Only)
- 12 13 ... Oscillograms Of Ignition Coils From Different Manufacturers
- 12 13 ... Checking Secondary Signal For Stationary Ignition Distribution
- Ignition Wires, Spark Plugs
- Ignition Coil
- Electronic Switching Or Control Unit
- 12 14 511 Replacing Transmission Speed Sensor (SMG)
- 12 14 521 Replacing Pulse Generator On Crankshaft (S54)
- 12 14 523 Replacing Pulse Generator On Inlet Camshaft (S54)
- 12 14 524 Replacing Pulse Generator On Exhaust Camshaft (S54)
- 12 14 550 Replacing Control Module (DME)
- 12 14 600 Replacing Knock Sensor(s) (S54)
- 12 14 700 Coding Control Module (DME/DDE)
- 12 14 705 Programming Control Unit (DME/DDE)
- 12 63 520 Replacing Main Relay
- 12 72 010 Removing And Installing/Replacing Throttle Actuator (S54)
- 13 62 530 Replacing Transmission Fluid Temperature Sensor (SMG)
- 61 35 ... Note On Replacing Codable/Programmable Control Units
- Alternator With Drive And Mount
- Regulator
- Starter With Mounting
- Starter Lead
- Engine Wiring Loom
- Oil Pressure/Oil Temperature Gauge
- Switches And Relays
- Sensor For Control Unit
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.
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