Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

HET 2nd Period > Electronic Fuel System Fundamentals > Flashcards

Electronic Fuel System Fundamentals Flashcards

1
Q

A waveform that has a continual change in amplitude is:

A

An analog system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Connecting computer controller systems and allowing them to communicate through a network is called:

A

Multiplexing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Sensor voltage high is an example of:

A

A system fault

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

An oil pressure sensor fault has a short between the 5v supply and the signal wire. What fault would the ecm display?

A

Sensor signal voltage high

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the most common type of DDL connector

A

6 or 9 pin Deutsch

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Actuators, diagnostic lights and diagnostic data link are all:

A

Outputs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

A coolant temperature sensor return wire is electrically open. What fault would the ecm display?

A

Sensor voltage high

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Pulse width modulation is:

A

A digital signal with variable on/off times

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

A signal that is on or off between two set voltages is:

A

A digital signal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are the 3 basic needs of an electronic control system?

A

Inputs, outputs and ecm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

An output device which recieves signals from an ecm is a:

A

Actuator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Speed of data transfer in a network is called:

A

Baud rate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Engine oil pressure low is an example of:

A

An engine protection fault

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Sensors , switches, and diagnostic data link are all:

A

Inputs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What are the three levels of engine protection programmed into an ecm?

A

Warning only, warning and de-rate, shut down

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

An analog signal must be__________before it can be read by the ecm?

A

Encoded

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Speed of data transfer in a network is called?

A

Baud rate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

When connecting or disconnecting the DDL connector:

A

The key should always be off

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

The common language in a network is called:

A

Protocol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

All engine manufacturers use what fault code system?

A

Their own system with a unique set of diagnostic codes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Speed sensors produce what type of signal?

A

Analog signal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

An electrical control module contains:

A

A central processing unit (CPU)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

RAM memory is sometimes referred to as a type of read/write memory? T or F

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

A thermistor is a type of variable resistor used in a temperature sensor. T or F

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Pressur sensors are typically wired to the ecm using a two wire circuit. T or F
False. Pressure sensors are typically wired to the ecm with a 3 wire circuit
26
BOI
Beginning of injection
27
CPU
Central processing unit
28
CTS
Coolant temperature sensor
29
DDT
Digital diagnostic tool
30
ECM
Electronic control module
31
ECU
Electronic control unit
32
EUI
Electronic unit injector
33
EMI
Electromagnetic interference
34
EPS
Engine position sensor
35
Hz
Measurement in frequency in cycles per second (hertz)
36
IC
Integrated circuit
37
IVS
Idle validation switch
38
OEM
Original equipment manufacturer
39
PWM
Pulse width modulation
40
RFI
Radio frequency interference
41
TBS
Turbo boost sensor
42
TPS
Throttle position sensor
43
VSS
Vehicle speed sensor
44
RAM
Random access memory
45
ROM
Read-only memory
46
PROM
Programmable read-only memory
47
EPROM
Electrically programmable read-only memory
48
EEPROM
Electrically erasable programmable read-only memory
49
Vehicle speed sensors and engine rpm sensors provide a variable frequency signal to the ecm. These signals can be used to operate a speedometer or a tachometer. T or F
True
50
Fault codes can only be generated to indicate engine protection problems. T or F
False. Fault codes can be generated to indicate engine protection problems and electronic system problems
51
Service and troubleshooting manuals are generally in an electronic format as part of the engine manufacturers diagnostic software package T or F
True
52
An electrical open in a temperature sensor circuit would produce a trouble code indicating that the sensor circuit voltage is:
Higher than the normal range of sensor values
53
Diagnostic information is generated by the ecm in the form of:
Fault codes, flash codes, diagnostic trouble codes
54
If an electrical short developed in a temperature sensor circuit, what would the ecm provide for fault information?
Sensor circuit voltage low
55
56
Temperature sensors have hiw many wires?
2 wires
57
Pressure sensors have how many wires?
3 wires
58
3 wire open supply is:
Low voltage
59
3 wire open signal is:
Low voltage
60
3 wire open return is:
High voltage
61
3 wire supply short to signal is:
High voltage
62
3 wire supply short to return is:
Low voltage
63
3 wire signal short to return is:
Low voltage
64
2 wire sensor an open is:
High voltage
65
2 wire sensor short is:
Low voltage
66
What does IAPCV stand for?
Injection actuation pressure control valve
67
What is the purpose of the cartridge valve on a EUI
Control fuel into and out of the injector
68
In an EUI system the poppet valve must__________for infection to begin
Close
69
HPCR is
Very commonly used
70
How is the BOI controlled on a EUP system?
The ECM energizes the EUP solenoid to close the poppet valve
71
EUI stands for?
Electronic unit injector
72
What is the purpose of an ecm cooling plate?
Uses supply fuel to cool the ecm
73
The 5 stages of injection are?
Pre injection, pilot injection, delay period, main injection, end of injection
74
The rail pressure sensor is monitored by the ecm so it can control the high pressure fuel by?
Adjusting the high pressure fuel pump inlet
75
HEUI stands for?
Hydraulically actuated electronically controlled unit injector
76
In a EUI injection system, what actuates the plunger to create high fuel pressure for injection?
Injector rocker arm operated by a lobe on the camshaft
77
What company was first in introducing the EUI
Detroit diesel
78
How many stages of injection does an EUI system have
4
79
How is the BOI controlled in a EUI system?
BOI occurs when the ECM energizes the solenoid
80
HPCR used what style injector?
Multi-hole
81
How does the injection actuation pressure control valve regulate the high pressure oil?
By controlling a bypass port (drain port)
82
What is the purpose of the Pressure Limiting Valve
To protect the system from excess pressure
83
In a HEUI Injection System how is the plunger actuated?
High pressure engine oil
84
EUP stamds for?
Electronic Unit Pump
85
In a HEUI what controls the high pressure oil acting on the injectors
IAPCV (Injection Actuation Pressure Control Valve)
86
In a HPCR system when can the injector inject fiel
Any time on any stroke
87
What action in the HPCR injector controls the BOI
ECM energizes the solenoid to open the control valve
88
HPCR stamds for?
High Pressure Common Rail
89
How in the BOI controlled in a HEUI system?
BOI occurrs when the ECM energizes the solenoid to open the poppet valve
90
What is the purpose of the fuel transfer system in an electronic fuel injection system?
To supply the injection system with clean, cool, air free fuel at the correct pressure and volume
91
What component does the high pressure oil act on inside the injector?
The intensifier piston
92
In a EUP system, what type of fuel injectors are used?
Inward opening hydraulic injection nozzles
93
How is the high pressure needed for injection created in a EUP system?
The unit pump plunger is actuated by the injection lobe on the engine camshaft
94
How do you troubleshoot a misfire in a HPCR system
Using an electronic service cut out each injector in turn till the miss is detected
95
In a HPCR system, what component creates the high pressure fuel for injection?
The high pressure fuel pump
96
HPCR will have ________psi in lines even when engine is shut off.
1000 psi
97
Most common type of throttle position sensor (TPS) is a ___________.
Potentiometer
98
The poppet valve in a HEUI must _______ to begin injection
Open
99
If there is 3000 psi of oil pressure in the oil rail what would you expect the injection pressure to be? (Multiplied by 6 to 7 times)
19,000 psi
100
How is the plunger moved back up after injection ends in EUI system?
Plunger spring
101
Which component in a HEUI injector controls the pilot injection?
The plunger
102
EGR
Exhaust Gas Recirculation
103
When was DEF first used?
2010
104
DOC
Diesel Oxidation Cataylist
105
DPF
Diesel particulate Filter
106
What is DEF injected into the Beginning of before the SCR?
Decomposition Chamber
107
What does SCR stand for
Selective Catalyst Reduction
108
EUP injection sequence is
1. Fill 2. pre-injection 3. Injection 4. Spill
109
EUI injection sequence is?
1. Pre-injection 2. Injection 3. End of injection 4. Fill

HET 2nd Period (2 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions