Deck 14: Can and Network Communications

Question 1

Technician A says that module communications networks are used to reduce the number of wires in a vehicle. Technician B says that a communications network is used to share data from sensors, which can be used by many different modules. 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

The vehicle has many essential modules for better performance of the electrical components. These modules have some common data to share for their application. The communication network decreases the complexity of connection and number of wires.
So, the technician A is correct.
The communication network reduces the complexity of installation and provides common data line for all the necessary. Common information on the network can be shared by the modules using data line.
So, the technician B is correct.
Hence, the correct option is
.
The remaining options do not satisfy the above condition. So, options 'a', 'b', and 'd' are incorrect.

Question 2

Why is a communication network used?

Answer 2

The vehicle has many essential modules for better performance of the electrical components. These modules have some common data to share for their application. The communication network decreases the complexity of connection and number of wires.
The communication network reduces the complexity of installation and provides common data line for all the necessary. Common information on the network can be shared by the modules using data line.
This is the reason why the communication network is needed.

Question 3

A module is also known as a ________.

A) BUS
B) Node
C) Terminator
D) Resistor pack

Answer 3

The vehicle has many essential modules for better performance of the electrical components. These modules have some common data to share for their application. The communication network decreases the complexity of connection and number of wires.
Each module in the communication network is known as node.
Hence, the correct option is
.
The remaining options do not satisfy the above condition. So, options 'a', 'c', and 'd' are incorrect.

Question 4

Why are the two wires twisted if used for network communications?

Question 5

A high-speed CAN BUS communicates with a scan tool through which terminal(s)?

A) 6 and 14
B) 2
C) 7 and 15
D) 4 and 16

Question 6

Why is a gateway module used?

Question 7

UART uses a _______ signal that toggles 0 V.

A) 5 V
B) 7 V
C) 8 V
D) 12 V

Question 8

What are U codes?

Question 9

GM Class 2 communication toggles between ________.

A) 5 and 7 V
B) 0 and 12 V
C) 7 and 12 V
D) 0 and 7 V

Question 10

Which terminal of the data link connector does General Motors use for Class 2 communication?

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

Question 11

GMLAN is the General Motors term for which type of module communication?

A) UART
B) Class 2
C) High-speed CAN
D) Keyword 2000

Question 12

CAN H and CAN L operate how?

A) CAN H is at 2.5 volts when not transmitting.
B) CAN L is at 2.5 volts when not transmitting.
C) CAN H goes to 3.5 volts when transmitting.
D) All of the above

Question 13

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

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

Question 14

Terminal 16 of the OBD-II data link connector is used for what?

A) Chassis ground
B) 12 V positive
C) Module (signal ground)
D) Manufacturer's discretion