Secondary-Direct Ignition Analysis - Launch X-431 User Manual

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Fig. Ignition-2 below shows the valid and invalid ignition waveforms. Under the working status of valid
ignition, the breakdown voltage and spark voltage are higher because the cylinder is filled with fresh
combustible mixture gas, which has a lower ionization level and vice versa.

4.4.3 Secondary-direct ignition analysis

1. Power the Scopebox on: Power is provided to the Scopebox in either of the following ways:
• Power adapter: Insert one end of the power adapter into the Power interface of the Scopebox, and the
other end to the AC outlet.
• Battery clamps cable: Plug one end of the power adapter 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 data cable to the Scopebox Data I/O port, and the other end to the
Data I/O port of the USB hub.
3. When the high-voltage wire is exposed, plug the BNC end of secondary ignition pickup into CH1/CH2/
CH3/CH4 channel of Scopebox, then connect the high-voltage clip to high-voltage line, and crocodile
clips to ground.
4. If no high-voltage wire is exposed, dismantle ignition coil of tested cylinder. Connect one end of the COP
extension cord to the ignition coil which should be grounded via COP earth cord, and insert the other end
into the cylinder to joint with spark plug. Then plug the BNC end of secondary ignition pickup into CH1/
CH2/CH3/CH4 channel of Scopebox, and then connect the high-voltage clip to high-voltage line, and
crocodile clips to ground.
108
High-voltage clips to
high-voltage line
BNC Connectors
to Channels
Connection Method
Fig. Ignition-2
Station
User's Guide
Crocodile clips
to ground
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