CAN H short circuit to ground
When a CAN H short-circuit to ground fault occurs, depending on the fault-tolerance characteristics of the CAN bus, the entire CAN network may be unable to communicate or a related fault code may be generated.
The voltage of CAN H is at 0V, and the voltage of CAN L is also at 0V, but a small voltage change can be seen on the CAN L wire. The bus waveform of CAN H short-circuited to ground is shown in the figure below.
When measuring the voltage, if both CAN H and CAN L voltages are about 0V and there is no open circuit problem, this type of fault has occurred. The CAN H voltage when CAN H is short-circuited to ground is shown in the figure below.
The CAN L voltage when CAN H is short-circuited to ground is shown in the figure below.
Cause of the fault: If the fault is not caused by the short circuit of the CAN H wire to the external ground wire, then this fault may be caused by the damage of the CAN transceiver inside the control module. The fault finding method is the same as above.
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