Failure Of The Can Bus Cables

The following faults can occur to the CAN bus wiring:

• CAN-H/L interrupted.
• CAN-H/L shorted to battery voltage.
• CAN-H/L shorted to ground.
• CAN-H shorted to CAN-L.
• Defective plug connections (damaged, corroded, or improperly crimped).

In each instance, the connected control units will store a fault due to the lack of information received over the CAN bus.

The voltage of the CAN bus is divided between the two data lines: CAN-High and CAN-Low for an average of 2.5V per line. The voltage measurement is taken from each data line to ground. Each module on the CAN contributes to this voltage. The fact that 2.5V are present does not mean that the CAN bus is fault free, it just means that the voltage level is sufficient to support communication.