12 13 Notes on checking ignition system

Troubleshooting

• Fault in fuel injection system.
• Spark plug faults.
• Ignition coil faults.
• Further fault patterns with evaluation.
• Additional fault notes for troubleshooting.
• Normal oscillogram. See 12 13... Normal oscillogram (M, S, W engines only) .
• Oscillograms of ignition coils from different manufacturers

  See 12 13 009 Checking rod-type ignition coils (M54, M56, N40, N42, N45, N46, N52, N62, N73) .

• Secondary signal for stationary ignition distribution. See 12 13... Checking secondary signal for stationary ignition distribution .