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electrical and steering > electrical circuit part B > Flashcards

electrical circuit part B Flashcards

1
Q

what are the two main advantages to multiplexing

A

40% less wires connectors and fuses . allows technicians to view and record data streams

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2
Q

what is multiplexing

A

the ability to send and receive digital and electronic signals over a pair of wires at high speed

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3
Q

what are the three multiplexing protocols

A

J1587/J1708
J1939 / CAN
ISO 11783 /CAN

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4
Q

who controls the protocol and rules that a device must follow in order to communicate with other modules

A

SAE

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5
Q

what determines the priority of a massage

A

a priority code embedded in each message

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6
Q

when removing a bulkhead connector you must remove

A

both locks primary and secondary locks

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7
Q

what does the ISO stand for and what do they do

A

International Organization Standardization . implement international proprietary , industrial and commercial standards

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8
Q

baud rate

A

the speed of data transfer over a network measured in kilo bytes per second

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9
Q

back bone

A

is a networks method of connection . ( fiber optics ,wires twisted pairs )

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10
Q

what is another name for the backbone

A

data bus

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11
Q

stub

A

is a section of data link that branches off the back bone and connects each node

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12
Q

what is the maximum length a stub can be

A

one meter

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13
Q

another name for a stub

A

a branch

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14
Q

node

A

is a computer or other device that has a unique address

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15
Q

terminating resistor

A

a resistor placed at each end of a data link to eliminate electrical interference ( 120 ohms resistor )

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16
Q

standing waves

A

are electrical reflections or waves that can cause major problems with module communication

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17
Q

vehicle communication data bus

A

is the communication network that connects all of the multiplexed components on a piece of mobile equipment

18
Q

protocol

A

is a common language for data communication between control modules

19
Q

controller area network (CAN)

A

is a communication protocol used on highway trucks

20
Q

what is the baud rate of J1939

A

250 kb/s

21
Q

where is the drain wire in shielded twisted pair connected

A

to ground

22
Q

why are conductors twisted

A

helps provide immunity to magnetic fields . allows conductors to maintain a constant capacitance

23
Q

what is the twist rate per foot in a twisted pair to provide sufficient resistance to electromagnetic force

A

12 twists per foot

24
Q

most modern data bus configuration use

A

linear topology . ( main backbone with stubs )

25
Q

why does the J1587 / J1708 not need terminating resistor

A

because of the slow communication rate 9600 baud or 9.6 kb/s

26
Q

why are messages used over J1587 / J1708 used only for diagnostic purposes

A

because of the slow communication speed limits the amount of nodes on the datalink and the information contained in each message to a maximum of 21 bytes

27
Q

message identifier

A

MID is one byte long ( 8 bits ) and indicates the source address of the transmitting node

28
Q

parameter identifier

A

PID is usually one byte long ( 8 bits ) and indicates what parameter the following data corresponds

29
Q

FMI

A

fault mode indicator . indicates the type of fault the system is having

30
Q

checksum

A

the checksum follows the final byte of data . it is one byte long and completes the message . if the message checksum value is zero then the message is valid

31
Q

why must the interconnector pins of J1587 be gold plated

A

to reduce the possibility of resistance

32
Q

what color are the J1587 / J1708 twisted pair

A

orange and white

33
Q

on most OEM 9 pin connectors what pin is the ground pin

A

the center pin

34
Q

what is one of the first test preformed with all multiplexing systems

A

see if the system is receiving power

35
Q

if you obtain a low voltage or no voltage reading on a data wire test

A

one of the circuits may be shorted out corrupting the entire data bus

36
Q

SAE J1939 PGN

A

parameter group number . is usually 8 bytes long and its purpose is to identify the message and its data

37
Q

SAE J1939 SPN

A

suspect parameter number . identifies and reports where a failure has occurred

38
Q

SAE J1939 FMI

A

is a five bit number and defines 0 to 31 types of failure

39
Q

SAE J1939 twisted pair wires

A

are green and yellow

40
Q

what is the non insulated copper wire on the shielded twisted pair

A

drain wire used to prevent signals from radiating out and blocks outside electromagnetic interference from corrupting the signal

41
Q

in a J1939 system a total loss of communication usually indicates

A

a voltage or hardware porblem

42
Q

in a J1939 system a partial loss of communication usually indicates

A

a data bus device failure

electrical and steering (8 decks)

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