CH26 ONBOARD VEHICLE
NETWORKS QUESTIONS AND
ANSWERS
Onboard vehicle networks are formed by - ans- sd sd sd sd sd sd sdsd
Connecting vehicle electronic control modules to one another to communicate and exchan
sd sd sd sd sd sd sd sd sd sd sd
ge information.sd
Communication takes place between all the modules and devices connected to the networ sd sd sd sd sd sd sd sd sd sd sd sd
k using - ans-An electrical signal-processing strategy called multiplexing (MUX).
sd sd sdsd sd sd sd sd sd sd
Onboard networks can be categorized by - ans- sd sd sd sd sd sd sdsd
Typology, their physical layer, their network protocol, or by whether they have centralized o
sd sd sd sd sd sd sd sd sd sd sd sd sd
r distributed control.
sd sd
Networks are formed based on organizational priorities, with modules grouped by - ans-
sd sd sd sd sd sd sd sd sd sd sd sdsd
Area or function, such as those involved in engine, transmission, ABS, climate control, instr
sd sd sd sd sd sd sd sd sd sd sd sd sd
umentation, entertainment devices, or body electrical control. sd sd sd sd sd sd
The type of multiplexing used in onboard networks works by - ans-
sd sd sd sd sd sd sd sd sd sd sdsd
dividing the time available to each network module or device to transmit and listen to inform
sd sd sd sd sd sd sd sd sd sd sd sd sd sd sd
ation. Only one module is allowed to talk, and all other modules must listen until it is their tur
sd sd sd sd sd sd sd sd sd sd sd sd sd sd sd sd sd sd
n to talk.
sd sd
Advantages of multiplexing include - ans- sd sd sd sd sdsd
Simplified software control of the electrical system, to enable onboard diagnostics, ease of
sd sd sd sd sd sd sd sd sd sd sd sd sd
connecting electronically controlled accessories and features, and reduction in number of
sd sd sd sd sd sd sd sd sd sd sd
sensors.
Controlled area networks are the most - ans- sd sd sd sd sd sd sdsd
Widely used type of network for integrating power train operation (PTO) of all the latest vehi
sd sd sd sd sd sd sd sd sd sd sd sd sd sd sd
cles.
Two different types of CANs used by on-
sd sd sd sd sd sd sd
highway trucks, buses, and highway equipment are - ans- sd sd sd sd sd sd sd sdsd
The SAE network standards of J-1939 and j-1587/1708.
sd sd sd sd sd sd sd
In serial communication, one wire, called CAN-HI, has a more - ans-
sd sd sd sd sd sd sd sd sd sd sdsd
Positive voltage than the other, which is CAN- sd sd sd sd sd sd sd
LO. Each wire has a mirror opposite charge of the other when communication takes place.
sd sd sd sd sd sd sd sd sd sd sd sd sd sd
, Wires are twisted to - ans- sd sd sd sd sdsd
Minimize electromagnetic interference caused by magnetic fields and radio waves. To furt
sd sd sd sd sd sd sd sd sd sd sd
her minimize signal distortion, at each end of the J-1939 CANBus there is a 120-
sd sd sd sd sd sd sd sd sd sd sd sd sd sd
ohm resistor that extinguishes multiplex voltage signals to prevent their reflection through t
sd sd sd sd sd sd sd sd sd sd sd sd
he data bus.
sd sd
J-1939 CAN 1.0 transmitted data at 125 to 250 kbps, but is now replaced by - ans-CAN-
sd sd sd sd sd sd sd sd sd sd sd sd sd sd sd sdsd
FD or CAN 2.0 with more than 500 kbps data rate using much larger messages.
sd sd sd sd sd sd sd sd sd sd sd sd sd sd
Network signals are - ans- sd sd sd sdsd
Distorted or slowed if terminating resistors are missing or defective.
sd sd sd sd sd sd sd sd sd
Data carried on the CANBus has several distinct message formats: - ans-
sd sd sd sd sd sd sd sd sd sd sdsd
Data frame, remote frame, error frame, and overload frame. Messages sent and received o
sd sd sd sd sd sd sd sd sd sd sd sd sd
ver the network are constructed in frames with a maximum transmission rate of over 500 kb
sd sd sd sd sd sd sd sd sd sd sd sd sd sd sd
ps/sec.
Messages are prioritized to prevent - ans- sd sd sd sd sd sdsd
Data collision between positive and negative signals canceling one another.
sd sd sd sd sd sd sd sd sd
Cell phone and Bluetooth technology are - ans-
sd sd sd sd sd sd sdsd
Two levels of network communication using wireless network interface.
sd sd sd sd sd sd sd sd
Disconnecting module one by one can help identify a module that is - ans- sd sd sd sd sd sd sd sd sd sd sd sd sdsd
Shorting out the CANBus, but the best diagnostic routine to identify a network problem is to
sd sd sd sd sd sd sd sd sd sd sd sd sd sd sd sd
perform resistance and voltage checks of the CANBus at the DLC.
sd sd sd sd sd sd sd sd sd sd
RP-1210 is a recommended practice for - ans- sd sd sd sd sd sd sdsd
An application programming interface (API) to bridge an electronic service tool with an onb
sd sd sd sd sd sd sd sd sd sd sd sd sd
oard network. sd
Bit arbitration - ans-
sd sd sdsd
The process of deciding which messages have priority to transmit over the network to prev
sd sd sd sd sd sd sd sd sd sd sd sd sd sd
ent data collision between positive and negative signals canceling one another.
sd sd sd sd sd sd sd sd sd sd
Bidirectional communication - ans-Two- sd sd sdsd
way multiplex communication. A communication channel between an electronic service to
sd sd sd sd sd sd sd sd sd sd
ol and vehicle network where commands are sent and data received by the service tool.
sd sd sd sd sd sd sd sd sd sd sd sd sd sd
Bluetooth - ans-A short- sd sdsd sd
range wireless technology that can automatically connect a device into a network.
sd sd sd sd sd sd sd sd sd sd sd
Controlled area network (CAN) - ans- sd sd sd sd sdsd
A distributed network control system in which several control modules exert varying degree
sd sd sd sd sd sd sd sd sd sd sd sd
s of control over common chassis electrical components.
sd sd sd sd sd sd sd
NETWORKS QUESTIONS AND
ANSWERS
Onboard vehicle networks are formed by - ans- sd sd sd sd sd sd sdsd
Connecting vehicle electronic control modules to one another to communicate and exchan
sd sd sd sd sd sd sd sd sd sd sd
ge information.sd
Communication takes place between all the modules and devices connected to the networ sd sd sd sd sd sd sd sd sd sd sd sd
k using - ans-An electrical signal-processing strategy called multiplexing (MUX).
sd sd sdsd sd sd sd sd sd sd
Onboard networks can be categorized by - ans- sd sd sd sd sd sd sdsd
Typology, their physical layer, their network protocol, or by whether they have centralized o
sd sd sd sd sd sd sd sd sd sd sd sd sd
r distributed control.
sd sd
Networks are formed based on organizational priorities, with modules grouped by - ans-
sd sd sd sd sd sd sd sd sd sd sd sdsd
Area or function, such as those involved in engine, transmission, ABS, climate control, instr
sd sd sd sd sd sd sd sd sd sd sd sd sd
umentation, entertainment devices, or body electrical control. sd sd sd sd sd sd
The type of multiplexing used in onboard networks works by - ans-
sd sd sd sd sd sd sd sd sd sd sdsd
dividing the time available to each network module or device to transmit and listen to inform
sd sd sd sd sd sd sd sd sd sd sd sd sd sd sd
ation. Only one module is allowed to talk, and all other modules must listen until it is their tur
sd sd sd sd sd sd sd sd sd sd sd sd sd sd sd sd sd sd
n to talk.
sd sd
Advantages of multiplexing include - ans- sd sd sd sd sdsd
Simplified software control of the electrical system, to enable onboard diagnostics, ease of
sd sd sd sd sd sd sd sd sd sd sd sd sd
connecting electronically controlled accessories and features, and reduction in number of
sd sd sd sd sd sd sd sd sd sd sd
sensors.
Controlled area networks are the most - ans- sd sd sd sd sd sd sdsd
Widely used type of network for integrating power train operation (PTO) of all the latest vehi
sd sd sd sd sd sd sd sd sd sd sd sd sd sd sd
cles.
Two different types of CANs used by on-
sd sd sd sd sd sd sd
highway trucks, buses, and highway equipment are - ans- sd sd sd sd sd sd sd sdsd
The SAE network standards of J-1939 and j-1587/1708.
sd sd sd sd sd sd sd
In serial communication, one wire, called CAN-HI, has a more - ans-
sd sd sd sd sd sd sd sd sd sd sdsd
Positive voltage than the other, which is CAN- sd sd sd sd sd sd sd
LO. Each wire has a mirror opposite charge of the other when communication takes place.
sd sd sd sd sd sd sd sd sd sd sd sd sd sd
, Wires are twisted to - ans- sd sd sd sd sdsd
Minimize electromagnetic interference caused by magnetic fields and radio waves. To furt
sd sd sd sd sd sd sd sd sd sd sd
her minimize signal distortion, at each end of the J-1939 CANBus there is a 120-
sd sd sd sd sd sd sd sd sd sd sd sd sd sd
ohm resistor that extinguishes multiplex voltage signals to prevent their reflection through t
sd sd sd sd sd sd sd sd sd sd sd sd
he data bus.
sd sd
J-1939 CAN 1.0 transmitted data at 125 to 250 kbps, but is now replaced by - ans-CAN-
sd sd sd sd sd sd sd sd sd sd sd sd sd sd sd sdsd
FD or CAN 2.0 with more than 500 kbps data rate using much larger messages.
sd sd sd sd sd sd sd sd sd sd sd sd sd sd
Network signals are - ans- sd sd sd sdsd
Distorted or slowed if terminating resistors are missing or defective.
sd sd sd sd sd sd sd sd sd
Data carried on the CANBus has several distinct message formats: - ans-
sd sd sd sd sd sd sd sd sd sd sdsd
Data frame, remote frame, error frame, and overload frame. Messages sent and received o
sd sd sd sd sd sd sd sd sd sd sd sd sd
ver the network are constructed in frames with a maximum transmission rate of over 500 kb
sd sd sd sd sd sd sd sd sd sd sd sd sd sd sd
ps/sec.
Messages are prioritized to prevent - ans- sd sd sd sd sd sdsd
Data collision between positive and negative signals canceling one another.
sd sd sd sd sd sd sd sd sd
Cell phone and Bluetooth technology are - ans-
sd sd sd sd sd sd sdsd
Two levels of network communication using wireless network interface.
sd sd sd sd sd sd sd sd
Disconnecting module one by one can help identify a module that is - ans- sd sd sd sd sd sd sd sd sd sd sd sd sdsd
Shorting out the CANBus, but the best diagnostic routine to identify a network problem is to
sd sd sd sd sd sd sd sd sd sd sd sd sd sd sd sd
perform resistance and voltage checks of the CANBus at the DLC.
sd sd sd sd sd sd sd sd sd sd
RP-1210 is a recommended practice for - ans- sd sd sd sd sd sd sdsd
An application programming interface (API) to bridge an electronic service tool with an onb
sd sd sd sd sd sd sd sd sd sd sd sd sd
oard network. sd
Bit arbitration - ans-
sd sd sdsd
The process of deciding which messages have priority to transmit over the network to prev
sd sd sd sd sd sd sd sd sd sd sd sd sd sd
ent data collision between positive and negative signals canceling one another.
sd sd sd sd sd sd sd sd sd sd
Bidirectional communication - ans-Two- sd sd sdsd
way multiplex communication. A communication channel between an electronic service to
sd sd sd sd sd sd sd sd sd sd
ol and vehicle network where commands are sent and data received by the service tool.
sd sd sd sd sd sd sd sd sd sd sd sd sd sd
Bluetooth - ans-A short- sd sdsd sd
range wireless technology that can automatically connect a device into a network.
sd sd sd sd sd sd sd sd sd sd sd
Controlled area network (CAN) - ans- sd sd sd sd sdsd
A distributed network control system in which several control modules exert varying degree
sd sd sd sd sd sd sd sd sd sd sd sd
s of control over common chassis electrical components.
sd sd sd sd sd sd sd
