12 13 Notes on checking ignition system

Troubleshooting

• Fault in fuel injection system 
• Spark plug faults 
• Ignition coil faults 

Oscillograms

• Normal oscillogram  (See 12 13 ... NORMAL OSCILLOGRAM (M, S, W ENGINES ONLY) )
• Oscillograms of ignition coils from different manufacturers 

Check

• Secondary signal for stationary ignition distribution  (See 12 13 ... CHECKING SECONDARY SIGNAL FOR STATIONARY IGNITION DISTRIBUTION )