LAUNCH X-431 PAD III User Manual
123
Fig. 13-5
13.4 Waveform analysis mode
The ignition secondary single-cylinder waveform test is mainly used to:
a. Analyze the ignition dwell angle of single cylinder.(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 combustion line).
d. Analyze the capability of capacitance (platinum or ignition system).
e. Find the spark plug that causes misfire of the cylinder (from combustion line).
This test can provide very meaningful 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
of engine mechanical parts, fuel system components, and ignition system
components. Different parts of the waveform can specify that some components
and systems on the specific cylinder have faults. Refer to the instructions for
various parts of waveform for the related component working status of specific
waveform section.
Test methods and conditions:
Start the engine or drive the vehicle according to the driving performance fault or
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