Technician Safety Information

INSTRUCTIONS FOR WORKING ON TRANSISTORIZED COIL-TYPE IGNITION (TCI) AND DIGITAL MOTOR ELECTRONICS (DME)

- Always disconnect battery or interrupt power supply to ignition control unit and ignition coil when working on the electrical system (charging battery or welding. etc.) - dangerous primary and secondary voltage as well as danger of destroying the ignition system.
- Never start the engine after removal of distributor cap and/or disconnection of wire on ignition coil term. 4 - pull off plug on ignition control unit.
- Never disconnect the battery or leads on the alternator and starter while engine is running.
- Only install specified original BMW parts.
- Never connect a shielded capacitor or test lamp on term. 1 of the ignition coil.
- Never connect wire of ignition coil term. 1 on ground or B + Consequently the ignition coil term. 1 wire must not be used to prevent engine starting when service installing a burglar alarm system.
- When checking the compression, pull off plug on control unit for TCI or master relay for fuel injection (relay no. 2) for DME.
- The secondary side (high voltage side) of the ignition system must be shielded with at least 4 k-ohms, whereby the original distributor rotor with 1 k-ohm shielded resistor must be installed. Do not use a 5 k-ohm distributor rotor for the shielding of radio and/or communication equipment.