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Home >> BMW >> 1995 >> M3 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Ignition Checks >> Direct Ignition System >> Ignition Coil Primary Signal Check
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Ignition Coil Primary Signal Check

  1. Select 4-cylinder mode on BMW SERVICE TESTER (Sun 2013 Engine Analyzer). Connect universal adapter lead on tester. Connect Brown lead to known good engine ground. See Figure . Connect Black lead to terminal No. 1 on Adapter (12-7-020).
  2. Connect adapter to ignition coil of cylinder being tested. Red lead is not used as only one cylinder can be measured. Engine speed displayed will be reduced by a factor of 4. Produce stopped signal on oscilloscope by pressing "R" button on tester. Combustion voltage line will be very erratic on oscilloscope pattern (this is normal).
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