LAUNCH X431 PAD Scopebox User’s Manual
rich. Too long combustion line (usually greater than 2ms) represents the mixing
ratio is rich, whereas too short of combustion line (usually less than 0.75ms)
represents the mixing ratio is lean.
Ignition coil oscillation:
Observe at least two oscillation waveforms after the combustion line, which will
be better if more than three oscillation w
aveforms, as it represents the ignition
coil and capacitor (on Platinum or ignition system) are normal.
Primary voltage analysis
According to the faulty primary voltage waveform collected by the ignition
analysis, the rel
ated components and mechanical equipment status of ignition
system electrical circuit can be analyzed, which provides a reliable basis for
the adjustment and maintenance of power circuit to avoid the blind demolition.
The waveform shown on Fig. 4-6, appears a lot of clutter on the contact break
point, which is obviou
sly caused by the serious erosion on contact break point.
It can be verified via burnishing the contact or changing the circuit breaker.
Fig. 4-6
For the primary voltage waveform shown on Fig
. 4-7, the damped attenuation
cycles obviously reduced on the spark period, the amplitude became lower,
which is evidently caused by capacitor leakage.
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