Chapter 3 Automotive Test
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3.5.4 K line
The K line is a special line for data transmission between the car control unit and the diagnostic instrument, and the
transmission rate is low. In general, K-Line is very different from CAN Bus and most communication networks. For
example, the CAN Bus network does not have a central or master ECM: all ECMs are equal because they can send
and receive information along the network. The K line has only one line, and the information is transmitted in
binary format and the pulse voltage signal is transmitted. Divided into 0 and 1, 0 is high level, 12V or above, 1 is
low level, voltage is 0V.
Use the SATO oscilloscope to test the K line, the specific operation is shown in Figure 3-49 below:
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