Technician A says that CAN L (-)and (chassis)ground are of equal voltage potential.Technician B says that modules networked to a J1939 bus are designed to identify the difference between CAN H (+)and CAN L (-)in message packet without reference to chassis ground.Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question

Quizplus · Accepted Answer

Technician B is correct because in a J1939 bus (and other CAN bus systems), the modules indeed identify messages based on the voltage difference between CAN H (High) and CAN L (Low) without needing a reference to the chassis ground. This differential signaling allows for more reliable communication in the presence of electrical noise.

Technician a Says That CAN L (-)And (Chassis)ground Are of Equal