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Fault diagnosis of volkswagen network system based on waveform analysis

Published:2015-04-08 author:WEI Qiu-lan，YAO Xin，DAI Xin-lei Browse: 3063 Check PDF documents

Fault diagnosis of volkswagen network system

based on waveform analysis

WEI Qiu-lan，YAO Xin，DAI Xin-lei

（Department of Automotive Engineering，Shaanxi College of Communication Technology，Xi'an 710018，China）

Abstract：Aiming at complexity in fault diagnosis of automobile network system，open circuit，short circuit，and line crossing fault

waveforms of power CAN-bus and comfortable CAN-bus，for the network system of Volkswagen Passat B5 vehicle，were studied. Methods

of fault diagnosis of network system CAN-bus were summarized，and the mechanism of fault waveforms were explained in detail. While，

the selection in appropriate diagnostic measuring point for detection of network system fault using oscillograph and diagnosis instrument

was proposed. Online transmission signals for Volkswagen Passat vehicle were tested by VAS6356 oscilloscope and VAS6150 diagnostic

apparatus. The results indicate that the measuring position has significant effect on both the waveforms of open circuit and high resistance

faults of power CAN-bus and the waveforms of short circuit fault of comfortable CAN-bus. Proper measuring position makes it easy for

obtaining the fault waveform and rapidly finding the fault site. This is important for fault diagnosis of automotive network transmission

system.

Key words：waveform analysis；automobile network system；fault diagnosis

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