Exam 36: Multiplexing

What does the processor that receives data from ladder switches use to determine switch status?

If a voltmeter is connected between J1939 CAN-low (positive test lead) and ground (negative test lead), what is the lowest measurement you would read if the data bus is functioning properly?

What could result if an EST that is not auto-bus detect capable (ABDC) is connected to a post-2014 J1939 data bus??

Technician A says that a J1939 Hi-bus twisted pair is usually shielded. Technician B says that the tin foil wrap found in some data buses provides a EMI protective shield. Who is right?

Technician A says that J1939 node activity can be identified using a DMM set on V-DC min-max mode. Technician B says that the V-DC min-max readings taken while verifying J1939 bus activity should run between a low of 1 volt and a high of 5 volts. Who is correct?

Technician A says that commercial vehicles today are required to use multiple TPS to signal multiple controllers connected on the powertrain bus. Technician B says that TPS status is broadcast on the data bus to be picked up by any controller with a SA on the bus that may require the signal. Who is correct?

When a global PGN message is broadcast on J1939, which of the following is true??

Which field in a J1939 data packet is used to broadcast the size (data volume) of a message?

?What prevents a black 9-pin J1939 DLC from connecting to a green 9-pin J1939 receptacle?

Which of the following is another way of saying algorithm?

Which of the following is known as the dominant bit in a J1939 multiplexing transaction?

Which of the following is NOT an advantage of a J1939 multiplexed chassis bus ?

Technician A says that any J1939 data bus can be accessed by connecting through a green 9-pin Deutsch connector. Technician B says that a J1939 data bus backbone can be accessed through a 3-pin Deutsch connector. Who is correct?

Which of the following is true of the differential voltage used on a typical J1939 message packet?

Technician A says that the bus topology used in CAN 2.0/ J1939 ensures that no single module networked to the bus has more importance than any other. Technician B says that it is almost impossible to add controllers (SAs) to a J1939 data bus after it has been manufactured. Who is correct?

Technician A says that ladder switches can perform as a toggle switch. Technician B says that some smart switches are multi-function. Who is correct?

When a J1939 bus experiences a dead short to the power side of the circuit, what is the likely outcome?

Technician A says that truck electronic hardware specified to be J1939 compatible can be stub connected to a J1939 data bus without using transducer modules. Technician B says that multiplexing transducers and gateway modules enable communications between different chassis data buses using different protocols. Who is correct?

Which of the following best defines baud rate when applied to data signaling?

What critical data is contained in the arbitration field in a typical data packet?