Launch X431 Scopebox - Page 53

LAUNCH Android-based Scopebox User’s Manual
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l engine ignition sequence)
Four-stroke in-line four-cylinder: 1-2-4-3, or 1-3-4-2
Four-stroke in-line six-cylinder: 1-5-3-6-2-4, or 1-4-2-6-3-5
Four-stroke in-line eight-cylinder: 1-8-4-3-6-5-7-2
Five-cylinder: 1-2-4-5-3
V 6 engine: Generally speaking, based on the person sitting on the driver cab,
if the right side cylinder numbers on the right side, from the front to the back
are as follows: 1, 3, 5; and the cylinder numbers on the left side, from the front
to the back are as follows: 2, 4, 6; then the ignition sequence is: 1－4－5－2－
3－6. If the cylinder numbers on the right side, from the front to the back are as
follows: 2, 4, 6; and cylinder numbers on the left side, from the front to the back
are as follows:1, 3, 5; then the ignition sequence is: 1－6－5－4－3－2.
The Figure 4-1 below shows the normal ignition waveform of distributor ignition
system, the upper one is the secondary waveform, and the lower one is the
primary waveform.
The secondary waveform
A section is contact open period; B section is make contact period, which is the
magnetizing field of ignition coil.