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Home >> BMW >> 1995 >> 525iT >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Engine Controls - Basic Testing) >> Ignition Checks >> Servicing Precautions >> Direct Ignition System (DIS)
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Direct Ignition System (DIS)

WARNING: This page is about a different car, the 1995 BMW 530iT and 1995 BMW 530i. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure ignition is turned off before working on the ignition system. The engine may not be started without a connected secondary circuit. When checking compression, remove Digital Motor Electronics (DME) master relay.
  2. DO NOT connect shielded capacitors to terminal No. 1 of the ignition coil. DO NOT connect terminal No. 1 of the ignition coil to ground or battery positive terminal, as this will damage ignition stages in DME control unit.
  3. 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 control unit.
NOTE: For location of DME master and fuel pump relays, see DME & FUEL PUMP RELAY LOCATION table under PRELIMINARY INSPECTION & ADJUSTMENTS.
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