2002 BMW M3 2D ConvertibleFACTORY OEM SERVICE PROCEDURE

12 13 Notes On Checking Ignition System

NOTES ON CHECKING IGNITION SYSTEM

Troubleshooting:
  1. _>Fault in fuel injection system, refer to 12 13 ... FAULT IN FUEL INJECTION SYSTEM .
  2. _>Spark plug faults, refer to SPARK-PLUG FAULTS .
  3. _>Ignition coil faults, refer to IGNITION COIL FAULTS .
  4. _>Further fault patterns with evaluation, refer to FURTHER FAULT PATTERNS WITH EVALUATION .
  5. _>Additional fault notes for troubleshooting, refer to ADDITIONAL FAULT NOTES FOR TROUBLESHOOTING .
Oscillograms:
  1. _>Normal oscillogram, refer to NORMAL OSCILLOGRAM (M, S, W ENGINES ONLY) .
  2. _>Oscillograms of ignition coils from different manufacturers, refer to OSCILLOGRAMS OF IGNITION COILS FROM DIFFERENT MANUFACTURERS .
Check
  1. _>Secondary signal for stationary ignition distribution, refer to 12 13 ... CHECKING SECONDARY SIGNAL FOR STATIONARY IGNITION DISTRIBUTION .
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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.

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