Launch X-431 User Manual page 89

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Tap or click
D. Hand-painted waveform simulation
This option offers great convenience for users to simulate special waveform or fault wave. Users only draw
the shape of waveform which needs to be simulated in central drawing area, and then configure some
parameters on the top, namely high level, low level, and cycle of waveform, then tap
will output a waveform as desired.
in the drawing area as a periodic one). Users should draw as large as wave in drawing zone so that the system can
sample more points to reduce tolerance. While drawing, just pay attention to the shape of waveform, high level, low
level and period can be ignored, which can be set in the Configure option.
In Fig. Sensor-1, tap "Hand-painted waveform simulation", a screen similar to the following figure will
appear.
Button descriptions:
[ ]: Save the current waveform.
[ ]: Loads the previously saved hand-drawn waveform.
[ ]: Clear all hand-drawn waveform.
[ ]: Tap or click to call out the predefined waveform for reference.
[ ]: Continues the following operation.
3). Precautions on checking vehicle sensor
• Hold the connector when plugging or unplugging it. Do not pull the cable for unplugging.
• At first check the fuse, fusible line and terminals. Then check others after eliminating these faults.
• When measuring voltage, the ignition switch should be on and the battery voltage should not be less than
11V.
• When measuring voltage, please shake the lead lightly in the vertical and horizontal direction for more
precision.
• When checking whether there is open in the line, disconnect the CEU and the relevant sensor at first,
then measure the resistance among the ports of sensor in order to determine whether open-circuit /
contact fault exists or not.
• When checking if there is a short in the line, please disconnect the CEU and the relevant sensor, then
measure the resistance value of the ports between the connected port and the vehicle body. If the
resistance value is more than 1MΩ, no fault occurs.
• Before disassembling the engine electrical control system cable, cut off the power supply, that is, turn the
ignition switch OFF and disconnect the cables on the battery poles.
• Contact the test probe and the two terminals/ the two leads to be measured when measuring the voltage
between the two terminals or the two leads.
• Contact the red test probe to the terminal/ the cable to be measured, and the black probe to the ground
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button to perform simulation test.
Just draw a complete periodic waveform (when it is outputted, the system will regard the waveform
Fig. Sensor-7
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