LAUNCH X-431 PAD III User Manual
119
Seen from the waveform, the amplitudes of breaker contact closed angle, break
angle and breakdown voltage and spark voltage are very clear, besides, the
spark delay period and two oscillations can also be tested. For the ignition
system without faults, compared with the whole cycle, the contact closed angle
just 45%-50% (four-cylinder), 63%-70% (six-cylinder), or 64%-71%
(eight-cyliner); the breakdown voltage is over 15kv; the spark voltage is about
9kV, the spark period is greater than 0.8ms. If these values or waveform are
abnormal, it means there is fault or the system needs to be adjusted.
13.2 Secondary-simultaneous ignition analysis
The following connection should be made before performing it:
1. Power the Scopebox on: Power is provided to the Scopebox in either of the
following ways:
• Power adaptor: Insert one end of the power adaptor into the Power
interface of the Scopebox, and the other end to the AC outlet.
• Battery clamps cable: Plug one end of the power adaptor into the Power
interface of the Scopebox, and then clamp the other two terminals to the
vehicle's battery (Red to +, and Black to -) respectively.
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. Connect the BNC connector of the secondary ignition pick-up to any channel
of the Scopebox, and clamp the crocodile clips and high-voltage clips onto
the vehicle ground and high-voltage line respectively.
The connection is as follows:
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