Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW2011M3 2D CONVERTIBLE, AUTOMATIC DCTREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 18 (ENGINE CONTROLS - BASIC TESTING)IGNITION CHECKSDIRECT IGNITION SYSTEMIGNITION COIL PRIMARY SIGNAL CHECK
2011 BMW M3 2D Convertible, Automatic DCT
Ignition Coil Primary Signal Check
2011 BMW M3 2D Convertible, Automatic DCTSECTION Ignition Coil Primary Signal Check
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.
- Select 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 (127020).
- 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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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.