LAUNCH X431 GDS Scopebox Manual
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 qu
ality 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 accroding to the driving
performance fa
ult or poor ignition, etc. Confirm the consistence of
judgement standard (the amplitude, frequency, shape and pulse
width, etc., for each cylinder), check the fault of the waveform for
corresponding components.
Waveform results: observe the ignition coil at the beginning of
charging, the relative con
sistent falling edge represents the dwell
angle and ignition timing of each cylinder are precise.
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