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Home >> BMW >> 1998 >> 528i Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Diagnostic Procedures >> Ignition Checks >> Servicing Precautions >> Direct Ignition System (DIS)
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Direct Ignition System (DIS)

NOTE: For location of DME and fuel pump relays, see DME & FUEL PUMP RELAY LOCATION  table under PRELIMINARY INSPECTION & ADJUSTMENTS.
  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.
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