LAUNCH X-431 PAD III User Manual
117
2. Connect the B-shaped terminal of the USB cable to the Scopebox USB port,
and the other end to the USB port of the diagnostic tool.
3. Plug the BNC end of secondary ignition pickup into CH1/CH2/CH3/CH4
channel of the Scopebox, and connect the high-voltage clip to high-voltage
line, and crocodile clips to ground.
*Tips: Common ignition sequence (the specific sequence is subject to the actual
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.
Figure 13-1 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.
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