Ignition Coil Faults

Evaluation of Voltage Peaks and Dying-Out Process at Idling Speed





1 Beginning of dying-out processes with normal peaks upwards and downwards.
2 Beginning of dying-out processes strongly shortened. Ignition coil is defective!
3 Beginning of dying-out processes downwards missing. Ignition coil is defective!

NOTE: Higher ignition voltage peak is not always available.

Evaluation of Sparking Voltage Line at Idling Speed





1 Normal sparking period.
2 Normal dying-outs to sparking voltage line. Ignition coil is okay.





1 Shorter sparking period.
2 Dying-outs to sparking voltage line available only weakly. Ignition coil is defective!





1 Much shorter sparking period.
2 Dying-outs to sparking voltage line missing. Ignition coil is defective!





No sparking voltage line. Ignition coil is defective!

Evaluation of Sparking Voltage Line at Engine Speed Increased to Approx. 1500 Rpm





1 Normal sparking period.
2 Normal dying-outs to sparking voltage line. Ignition coil is okay.





1 Shorter sparking period.
2 Dying-outs to sparking voltage line available only weakly. Ignition coil is defective!





1 Normal sparking period.
2 Dying-outs to sparking voltage line missing. Ignition coil is defective!