Launch X431 Scopebox - Page 110

LAUNCH X431 GDS Scopebox Manual
Fig.4-16
A lot of clutter will be displayed on the horizontal section of primary
waveform if contact has poo
r grounding, as shown below figure
4-17.
Fig.4-17
Fig. 4-18 shows the fault of low-voltage waveform in electronic
ignition system
. The voltage does not rise during magnetizing, which
indicates that the effect of limitation of the circuit failed and no
components on distributorless ignition system can be adjusted.
When this waveform is abnormal, you can only replace the ignition
coils, igniter, ignition signal generator and cam position sensor, etc.,
one by one, to find out the faulty component or module.