Direct Ignition System (DIS)

WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 1997 BMW Z3, 1997 BMW M3, 1997 BMW 840Ci, 1997 BMW 740iL, and 1997 BMW 740i. However, it is still accessible from the selected car via links, so may be relevant.

Ensure ignition is turned off before working on the ignition system. The engine will not start without a connected secondary circuit. When checking compression, remove Digital Motor Electronics (DME) Electronic Control Unit (ECU) relay. See DME & FUEL PUMP RELAY LOCATION .
Shielded capacitors may not be connected to terminal No. 1 of the ignition coil. Terminal No. 1 of the ignition coil may not be connected to ground or battery positive terminal, as this will damage ignition stages in DME control unit.
DO NOT connect DVOM or test light to terminal No. 1 of ignition coil while engine is running. High tension (350 volts) is present at coil terminal No. 4, secondary ignition leads, spark plugs and ignition coil terminal No. 1 to DME Electronic Control Unit (ECU).

NOTE: For location of DME master and fuel pump relays, see DME & FUEL PUMP RELAY LOCATION under FUEL SYSTEM PRESSURE RELEASE under FUEL SYSTEM.