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Electrical, Failure & CVIP > Electrical Fundamentals - B > Flashcards

Electrical Fundamentals - B Flashcards

1
Q

What must be done with malfunctioning audible warning devices?

A

Replaced

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2
Q

When multiple warning lights uses same buzzer, how is it wired?

A

In parallel to lights with a isolating diode to prevent the other lights from activating.

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3
Q

The warning light control device may control what?

A

Either the lights battery voltage supply circuit or the lights ground circuit

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4
Q

Instrument and gauges

A

Also called meters, can be either direct or indirect

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5
Q

Direct acting gauges

A

Do not use sending units. The gauge is connected directly to source of what they are measuring.

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6
Q

Indirect acting gauges

A

Require sending units and can receive analog or digital signals

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7
Q

Analog gauge

A

Is a electromechanical device with needles or pointers that swing across a calibrated scale.

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8
Q

What are the 3 most common types of analog gauges

A

Balancing coil
Stepper motor
Air core

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9
Q

Directly proportional gauge

A

As resistance increases, level on gauge increases

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10
Q

Indirectly proportional gauge

A

As resistance increases, level on gauge decreases

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11
Q

Thermistor

A

A variable resistor whose resistance changes significantly with changes in temperature.

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12
Q

Digital ammeter

A

Uses a hall effect sensor and an integrated circuit amplifier (similar to amp clamp)

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13
Q

Pulses per mile (PPM)

A

=M x Ra x N. Where M is tire rev’s per mile, Ra is rear axle ratio, and N is number of teeth on tone ring.

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14
Q

How does a digital gauge receive its signal?

A

Over the vehicles data link

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15
Q

A Hall effect sensor sends an amperage signal to the ammeter by:

A

Using a integrated circuit amplifier

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16
Q

Baud rate

A

Is the speed of the data transfer over the network, commonly measured in kilobits per second (kb/s). One baud is the transfer of one digital signal, or bit per second

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17
Q

The Backbone

A

In most vehicles is a twisted pair of wires that are often shielded with a copper wire to prevent electromagnetic interference (EMI). Is also referred to as the data bus

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18
Q

Stub

A

Is a segment of data link that branches off the backbone and connects to each node. Can be up to 1 meter in length

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19
Q

Node

A

Is a computer or other device that has a unique network address. Each ECM is considered a node on the data link

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20
Q

Vehicle communication data bus

A

The communication network that connects to all of the multiplexed components of a vehicle system (J1708, J1939)

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21
Q

Protocol

A

Is a common language for data communication between control modules. J1587 and CAN are the common protocols in heavy duty vehicles.

22
Q

(CAN) Controller Area Network

A

Is a communication protocol used in on-highway trucks. Provides a serial communications protocol, meaning that all of the information sent on the network is in sequence.

23
Q

Data Links

A

Provide for the transmission of input and output signals between nodes and diagnostic scan tools

24
Q

Multiplexing

A

Is the ability to send and receive digital electronic signals over a pair of wires (data link) at high speed

25
Q

What are the advantages of using a data link over point to point wires? (4)

A

Minimizes the amount of electrical wiring the vehicle uses.
Provides an easy way to add electrically controlled components
Reductions to size and cost of wiring harness
Fewer wire and connectors means more reliability

26
Q

What is the most popular type of multiplexing?

A

Time division multiplexing

27
Q

The J1587/J1708 has what system limitations?

A

Number of nodes is limited to 20, communication speed is slow (9.6 kb/s), messages limited to maximum of 21 bytes (168 bits)

28
Q

J1587 MID

A

Message identifier, is 1 byte long and indicates the source of the address of the transmitting node. Each node may be assigned a number between 1 and 255, most common are 128-255

29
Q

J1587 PID

A

Parameter identifier, usually 1 byte long and indicates to what parameter the following data corresponds. Can be 0-255

30
Q

J1587 Parameter data bytes

A

All PID’s must be followed by a least one data value. Can not exceed 18 bytes.
PID 0-127 - 1 data byte
PID 128-191 - 2 data byte
PID 192-255 - 1 to 18 data byte

31
Q

J1587 Checksum

A

Follows the final byte of data. it is 1 byte long and completes the message

32
Q

J1587 bus

A

Is an unshielded twisted pair cable, usually orange and white in colour, does not require termination resistors

33
Q

What connector was standard between 1996 and 2001?

A

6 pin deutsch HD10-6-12P

34
Q

What connector did most OEMs convert to in 2001?

A

9 pin deutsch HD10-9-1939P

35
Q

J1939 PGN

A

Parameter group number, usually 8 bytes long and its purpose is to identify the message and its data

36
Q

J1939 SPN

A

Suspect parameter number 19 bits, is used to identify and report where the failure has occurred

37
Q

J1939 FMI

A

Failure mode identifier, 5 bits, identifies the type of failure

38
Q

What is the order of the fields in the Can message frame?

A 
Arbitration - Identifies priority and sender
Control - Additional info
Data - Additional info
CRC- Checks for errors
ACK - acknowledges receipt 
End - terminates message
39
Q

J 1939 data bus cables

A

Yellow - the CAN high (+)
Green - the CAN low (-)
1939-11 is shielded or heavy
1939-15 is unshielded or lite

40
Q

J1939 cable should have how many twists?

A

12 twists per foot

41
Q

What does the j1939 cable have on the ends of each wire?

A

A 120 ohm resistor

42
Q

Messages on the J1939 need to be terminated in order to minimize what?

A

Standing waves, which are when old messages are bounced into new messages corrupting the data in the new message.

43
Q

What happens when the terminating resistors fail?

A

If 1 fails is missing, communication glitches will occur.

If both are missing, communication will fail all together.

44
Q

What is the expected idle voltage on the J1587.

A

High - 3.2 - 3.9 VDC that is constantly changing

Low - 0.7 -2.0 VDC that is constantly changing

45
Q

What is the expected idle voltage on the J1939

A

2.0 - 4.0 VDC for both the High and Low

46
Q

What is the expected resistance when testing between CAN high/Can low and ground?

A

1 - 4 M ohms or OL

47
Q

What is the expected resistance between the J1939 shield wire and a chassis ground?

A

0 Ohms

48
Q

Control Logic

A

Is the ability to program certain features to automatically respond once certain conditions are met (EX. headlights automatically turn on when wipers are turned on)

49
Q

Bulkhead control module

A

BHM, known as the brains of the system, also known as the input module

50
Q

Chassis control module

A

CHM, also known as output module, works with the BHM to communicate input and output signals from the components connected to it.

Electrical, Failure & CVIP (5 decks)

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