When a voltage of value of 12 volts is measured off the CAN high line of a properly functioning J1939 data backbone, what is happening?
A) bus wake-up
B) message packet stop bit
C) ack field alert
D) dead short to insulated circuit

Question

Quizplus · Accepted Answer

When a voltage of 12 volts is measured off the CAN high line of a properly functioning J1939 data backbone, it typically indicates a bus wake-up. This is because the J1939 standard, used in heavy-duty vehicles, operates with a nominal voltage of 24 volts, and a 12-volt measurement on the CAN high line can signal that the bus is transitioning from a dormant state to an active state, initiating communication among connected devices.

When a Voltage of Value of 12 Volts Is Measured