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Home >> BMW >> 1992 >> 325is Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Ignition Checks >> Servicing Precautions >> Direct Ignition System (DIS)
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Direct Ignition System (DIS)

  1. Ignition switch must ALWAYS be turned off before working on the ignition system. The engine may not be started without a connected secondary circuit. When checking compression, the DME master relay must be removed.
  2. 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.
  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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