Ignition Coil Fault

IGNITION COIL FAULT:

Evaluation of ignition voltage spikes and the attenuation process at idle speed.




1. Start of attenuation processes - normal size upwards and downwards.
2. Start of attenuation processes severely abbreviated. Ignition coil defective!
3. Start of downwards attenuation processes missing. Ignition coil defective!

NOTE: Increased ignition voltage peak no longer present.

Evaluation of combustion voltage curve at idle speed.




1. Normal combustion period.
2. Normal attenuations after combustion voltage curve. Ignition coil OK.




1. Shortened combustion period.
2. Only slight attenuations present after combustion voltage curve. Ignition coil defective!




1. Severely abbreviated combustion period.
2. Attenuations after combustion voltage curve absent. Ignition coil defective!




- No combustion voltage curve. Ignition coil defective!

Evaluation of combustion voltage curve at raised engine speed of approx. 1500 RPM.




1. Normal combustion period.
2. Normal attenuations after combustion voltage curve. Ignition coil OK




1. Shortened combustion period.
2. Only slight attenuations present after combustion voltage curve. Ignition coil defective!




1. Normal combustion period.
2. Attenuations after combustion voltage curve absent. Ignition coil defective!