BMW X3 Service & Repair Manual: Instructions for working on the ignition system

BMW X3 Service & Repair Manual / Electrical / Troubleshooting / Instructions for working on the ignition system

CAUTION: Always switch off ignition before working on ignition system.

Use only test leads which have been approved and belong to these 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 under 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.

High tension! - High tension!

IMPORTANT: Hazardous voltages occur at:

  • Ignition lead
  • spark-plug connectors
  • spark plugs
  • 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)
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