LAUNCH X431 PAD Scopebox User’s Manual
Fig. 4-5
4.4 Waveform analysis mode
The ignition secondary single-cylinder waveform test is mainly used to:
a. Analyze the ignition dwell angle of single cy
linder.(ignition coil charging
time)
b. Analyze the capability of ignition coil and secondary high tension circuit
(from ignition line
to ignition voltage line).
c. Find the improper mixture A/F ratio of single cylinder (from co
mbustion
line).
d. Analyze the capability of capacitance (platinum or ignition sy
stem).
e. Find the spark plug that causes misfire of the c
ylinder (from combustion
line).
This test can provide very meaningfu
l information about the combustion quality
for each cylinder. If necessary, this test can also be performed during driving.
Since the secondary ignition waveform is significantly affected by different
engines, fuel systems and ignition conditions, it is useful for detecting the faults
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