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Detector With A Diagnosis Of Automotive Can Bus System Failure (figure)

LAN on the vehicle diagnostic tests, has been for many small and medium Service Enterprises are difficult issues. The reason, in addition to technical strength reasons, more important is not equipped with the relevant testing equipment. As the vehicle CAN system fault detection Diagnostic Engines are generally high Analyzer Or the original special fault diagnostic apparatus, high prices restricted the maintenance of these small and medium enterprises access to testing equipment. In recent years, domestic Market CAN bus vehicles appear Detector To easily resolve this problem. It is similar to ordinary multimeter host, accompanied by the appropriate diagnosis-specific lines, with the corresponding data interface connected, you can quickly and easily detect LAN failure. This inexpensive device, maintenance personnel by SMEs in general.

Vehicle CAN Bus Analyzer for the rapid detection and testing of a complete assembly with VAN, CAN (H) and CAN (L) features vehicle network system, which is mainly used for the following test items.

(1) detect the existence of bus physical problems, such as wiring harness, plug Connector Connection status. Detection of such cases for the static test, need to turn off the power.

(2) the accuracy of detection of network communications, confirmed that the measured parameters are consistent with the standard parameters, this dynamic test, need to turn on the ignition switch to be tested.

(3) detection of the direction the network is normal, by observing the LED light display on the instrument display, analyze cause of the malfunction. As the test results can be displayed very intuitively. Although the device can not fault diagnostic apparatus as special as the contents of a text display detection, but the maintenance personnel according to the flashing LED lights, and combined with the description of the meaning of the code 64 can also be very convenient access to diagnostic help.

(4) Poor Ground (-) and power (+), VAN or the current voltage status.

Detector with a diagnosis of automotive CAN bus system failure (Figure)

Use during the test instrument with the vehicle battery connection (Figure). The user through the button to select the network you want to control their own categories, such as CAN (H), CAN (L) or VAN, then the vehicle CAN (H) / DATA, or CAN (L) / DATA B or C to connect to the jack , then read the data device on the network. Test will test the document into the jack A, and test test pen needles and connectors, wire contacts for testing. In this example

vehicle CAN Bus Analyzer application in fault diagnosis. An annual output of Jaguar cars in 1999, the user reflect on the dashboard ABS, suspension and drive-slip fault system warning light alarm simultaneously. According to failure analysis of phenomena, I believe that this failure should be the public part of these lines is a problem, then decided to use the vehicle CAN Bus Analyzer to be checked. First on the ABS to the PCM data line between the static test, the results line normal; then the author has measured the PCM to the suspension of data lines between the control unit is also no problem. Demolition of the left front door of the plaque, found at the bottom of the door DDM module, and found the four data lines, not measurements, I suddenly found that DDM plug loose. Then forced to bear the plug inserted, turn on the ignition switch, this time through the self-test vehicle, the display on the dashboard warning lights all off, road test found troubleshooting.

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