Working On Ignition System
WARNING: This page is about a different car, the 2002 BMW M Roadster, 2002 BMW M Coupe, 2001 BMW M Roadster, and 2001 BMW M Coupe. However, it is still accessible from the selected car via links, so may be relevant.
Safety instructions:
- Always switch off ignition before working on ignition system.
- Use only test leads which have been approved and belong to the testing instruments (e.g. DIS Tester).
- Comply with operating instructions of the respective testing instrument used.
- Comply with the country-specific safety regulations.
- Never touch components conducting current with engine running!
- Comply with instructions of DIS tester.
- Do not connect any suppression capacitors or inspection lamps to terminal 1 on the ignition coil.
- Terminal 1 of ignition coil must not be connected to ground or battery positive lead.
- If an alarm system is subsequently installed, lead of terminal 1 must not be used for start prevention.
- When working on ignition system, always disconnect supply leads to ignition coils.
CAUTION:
High voltage! - Mortal danger! Caution! Hazardous voltages occur at:
- Ignition lead
- Spark-plug connector
- Spark plug
- Ignition coil (high voltage at terminal 4 is approx. 40 kV)
- Lead of terminal 1 from ignition coil to DME control unit (high voltage approx. 350 V)