Deck 9: Can and Network Communications

Question 1

Network diagnosis is being discussed. Technician A says that a test light can be used at the DLC to determine if the CAN bus has activity. Technician B says that a break-out box can be used to determine if there is activity on the CAN bus. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Answer 1

B

Question 2

Technician A says that a break-out box (BOB) can be used to access the BUS terminals while using a scan tool to activate the modules. Technician B says that a typical 38-cavity diagnostic connector as found on many BMW and Mercedes vehicles under the hood. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Answer 2

C

Question 3

The process of sending multiple signals of information at the same time over a signal wire and then separating the signals at the receiving end is which of these?

A) Multiplexing
B) Controller Area Network
C) Modulating
D) Rectifying

Answer 3

A

Question 4

Low-speed networks operate at less than ________ bits per second.

A) 2,000
B) 8,000
C) 10,000
D) 5,000

Question 5

The UART data BUS operates at a baud rate of ________ bps.

A) 8192
B) 8211
C) 8182
D) 5543

Question 6

Which terminal of the OBD-II data link connector is the chassis ground for all vehicles?

A) 1
B) 3
C) 4
D) 5

Question 7

Which of these, commonly designated D2B, is an optical BUS system connecting audio, video, computer and telephone components in a single-ring structure with a speed of up to 5,600,000 bps?

A) Flexray BUS
B) GMLAN
C) CAN Network
D) Domestic Digital BUS

Question 8

An OBD-I Ford is able to provide engine serial data if there are terminals in which cavities of the DLC?

A) 2 and 6
B) 1 and 2
C) 2 and 4
D) 1 and 3

Question 9

Which of these is a version of Byteflight and is a high-speed serial communication system for in-vehicle networks?

A) Flexray BUS
B) Domestic Digital BUS
C) CAN Network
D) GMLAN

Question 10

Which of these is a single-wire serial communications protocol, using one master control module and many slave modules?

A) Media Oriented System Transport (MOST)
B) Flexray BUS
C) GMLAN
D) Motorola Interconnect (MI)

Question 11

Technician A says a CANDi module will flash the RED LED rapidly if communication is detected. Technician B says A twisted pair is where two wires are twisted to prevent electromagnetic radiation from affecting the signals passing through the wires. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question 12

Technician A says Chrysler OBD-I (1981-1995) vehicles were equipped with a BUS system called Serial Communications Interface (SCI). Technician B says The Chrysler Programmable Controller Interface (PCI) is a three-wire communication protocol that connects at the OBD-II DLC at terminal 2. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question 13

A DMM set to read DC volts is connected across terminals 6 and 14 of the DLC. The meter reads zero volts at all times, key on or key off. This indicates ________.

A) a low temperature condition
B) a CAN BUS shorted to ground
C) bad UART output
D) headlights are OFF

Question 14

The MOST BUS is currently used for ________ data communications.

A) engine PCM
B) theft deterrent
C) entertainment
D) engine starting