| 摘要 |
The invention relates to a diagnostic test device for motor vehicles which comprises a portable testing apparatus, whereby control units equipped with self-diagnosing means are installed in the motor vehicle. Said control units control and monitor the engine control and other systems of the motor vehicle, generate and store error codes, and can be connected to an external testing apparatus via a diagnostic/test plug located in the motor vehicle. According to the invention, the external portable testing apparatus is equipped with a modem and is connected to a mobile telephone, in order to carry out a diagnosis of errors and troubleshooting at locations away from stationary repair facilities over an appropriately constructed network.
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