Question 1

What would be the performance consequence of failing to reprogram an EUI calibration code when an injector is changed out?

Accepted Answer

A)  rough engine operation 
B)  engine runaway 
C)  lower idle speed 
D)  higher idle speed 
A)  rough engine operation 
B)  engine runaway 
C)  lower idle speed 
D)  higher idle speed

Question 2

Which of the following types of throttle position sensors (TPS) would be used on most diesel engines fueled by single actuator EUIs?

Accepted Answer

A)  Potentiometer 
B)  Variable Capacitance 
C)  Hall-effect 
D)  Acoustic 
A)  Potentiometer 
B)  Variable Capacitance 
C)  Hall-effect 
D)  Acoustic

Question 3

Which of the following is NOT true of the signal voltage value returned by a potentiometer type TPS if it is functioning properly?

Accepted Answer

A)  varies proportionally with pedal travel 
B)  must be less than V-Ref value 
C)  lowest value is at zero pedal travel 
D)  digital PWM format 
A)  varies proportionally with pedal travel 
B)  must be less than V-Ref value 
C)  lowest value is at zero pedal travel 
D)  digital PWM format

Question 4

Which of the following values represents a typical charging pressure in EUI-fueled engines built before 2007?

Accepted Answer

A)  30 psi 
B)  60 psi 
C)  120 psi 
D)  5000 psi 
A)  30 psi 
B)  60 psi 
C)  120 psi 
D)  5000 psi

Question 5

What voltage are DDEC single actuator EUIs switched at?

Accepted Answer

A)  5 V-DC 
B)  12 V-DC 
C)  78 V-DC 
D)  over 100 V-DC 
A)  5 V-DC 
B)  12 V-DC 
C)  78 V-DC 
D)  over 100 V-DC

Question 6

What mechanical feature defines the limits within which EUI fuel pulse width (PW) must take place?

Accepted Answer

A)  injector cam profile 
B)  camshaft position signal 
C)  valve cam profiles 
D)  crankshaft position signal 
A)  injector cam profile 
B)  camshaft position signal 
C)  valve cam profiles 
D)  crankshaft position signal

Question 7

What is the acronym Caterpillar use to describe their EUIs?

Accepted Answer

A)  ADEM 
B)  ACERT 
C)  MEUI 
D)  HEUI 
A)  ADEM 
B)  ACERT 
C)  MEUI 
D)  HEUI

Question 8

What engine was the first generation of DDEC electronics (DDEC I) used on?

Accepted Answer

A)  Series 92 
B)  60 Series 
C)  55 Series 
D)  50 Series 
A)  Series 92 
B)  60 Series 
C)  55 Series 
D)  50 Series

Question 9

When a single-cylinder cutout test is being performed on a typical EUI-fueled engine with the objective of identifying a dead cylinder, what happens to mean (average) PW when the EUI over the dead cylinder is cut?

Accepted Answer

A)  mean PW increases 
B)  mean PW does not change 
C)  mean PW decreases 
D)  engine rpm drops by approximately 17 % 
A)  mean PW increases 
B)  mean PW does not change 
C)  mean PW decreases 
D)  engine rpm drops by approximately 17 %

Question 10

Identify the ACERT equipped engine in the list below:

Accepted Answer

A)  C15 
B)  C-15 
C)  3406E 
D)  C-10 
A)  C15 
B)  C-15 
C)  3406E 
D)  C-10

Question 11

Which of the following describes the role of fuel that enters the timing chamber in a CELECT Plus injector?

Accepted Answer

A)  keeps the metering checkball seated 
B)  hydraulic link between timing and metering plungers 
C)  keeps the spill passage sealed 
D)  loads the nozzle valve closed until the control solenoid is energized 
A)  keeps the metering checkball seated 
B)  hydraulic link between timing and metering plungers 
C)  keeps the spill passage sealed 
D)  loads the nozzle valve closed until the control solenoid is energized

Question 12

A Series 60 engine equipped with N2 injectors is being tuned up using the DDC service literature procedure. Technician A says that when the valves at cylinder #4 are at overlap, the EUI height may be set at cylinder #6. Technician B says that in this position, the valves at cylinder #3 may also be set. Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B 
A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B

Question 13

When an engine is key-on and engine-off (KOEO), the EUI solenoids can be heard to rhythmically click in sequence. Which of the following is likely to be true?

Accepted Answer

A)  a state of health (SOH) is being run 
B)  a failed EUI has been detected 
C)  system electrical failure 
D)  connect an EST to troubleshoot 
A)  a state of health (SOH) is being run 
B)  a failed EUI has been detected 
C)  system electrical failure 
D)  connect an EST to troubleshoot

Question 14

Which was the first computer controlled, truck diesel engine to be manufactured in North America?

Accepted Answer

A)  DDC Series 92 DDEC I 
B)  DDC Series 50 
C)  DDC Series 60 
D)  DDC Series 40 
A)  DDC Series 92 DDEC I 
B)  DDC Series 50 
C)  DDC Series 60 
D)  DDC Series 40

Question 15

Which of the following tests is executed by electronically cutting out EUIs in a sequence?

Accepted Answer

A)  Cylinder contribution test 
B)  Engine balance test 
C)  Injector cutout test 
D)  All of the above 
A)  Cylinder contribution test 
B)  Engine balance test 
C)  Injector cutout test 
D)  All of the above

Question 16

Where does return fuel exit a CELECT Plus injector after the injection pulse?

Accepted Answer

A)  metering spill port 
B)  fuel drain in upper annulus 
C)  cup 
D)  inlet in the lower annulus 
A)  metering spill port 
B)  fuel drain in upper annulus 
C)  cup 
D)  inlet in the lower annulus

Question 17

Technician A says that failure to reprogram injector calibration codes to the ECM after an EUI change-out result in unbalanced fueling. Technician B says that most OEMs require EUI calibration codes to be reprogrammed each time an injector is changed out. Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B 
A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B

Question 18

Which of the following is NOT an advantage of pilot injection?

Accepted Answer

A)  reduced engine wear 
B)  lower cold-start emissions 
C)  detonation avoidance 
D)  extended EUI service life 
A)  reduced engine wear 
B)  lower cold-start emissions 
C)  detonation avoidance 
D)  extended EUI service life

Question 19

What what you be looking for when attempting to identify a Caterpillar E-Trim code?

Accepted Answer

A)  single digit alpha 
B)  two digit numeric 
C)  four digit alpha 
D)  four digit numeric 
A)  single digit alpha 
B)  two digit numeric 
C)  four digit alpha 
D)  four digit numeric

Question 20

Which of the following determines the length of a plunger effective stroke in a single actuator EUI?

Accepted Answer

A)  length of plunger downstroke 
B)  cam lift 
C)  time EUI control solenoid is energized 
D)  the duration of the TPS signal 
A)  length of plunger downstroke 
B)  cam lift 
C)  time EUI control solenoid is energized 
D)  the duration of the TPS signal

Exam 25: Single-Actuator Eui Systems

What would be the performance consequence of failing to reprogram an EUI calibration code when an injector is changed out?

Which of the following types of throttle position sensors (TPS) would be used on most diesel engines fueled by single actuator EUIs?

Which of the following is NOT true of the signal voltage value returned by a potentiometer type TPS if it is functioning properly?

Which of the following values represents a typical charging pressure in EUI-fueled engines built before 2007?

What voltage are DDEC single actuator EUIs switched at?

What mechanical feature defines the limits within which EUI fuel pulse width (PW) must take place?

What is the acronym Caterpillar use to describe their EUIs?

What engine was the first generation of DDEC electronics (DDEC I) used on?

When a single-cylinder cutout test is being performed on a typical EUI-fueled engine with the objective of identifying a dead cylinder, what happens to mean (average) PW when the EUI over the dead cylinder is cut?

Identify the ACERT equipped engine in the list below:

Which of the following describes the role of fuel that enters the timing chamber in a CELECT Plus injector?

When an engine is key-on and engine-off (KOEO), the EUI solenoids can be heard to rhythmically click in sequence. Which of the following is likely to be true?

Which was the first computer controlled, truck diesel engine to be manufactured in North America?

Which of the following tests is executed by electronically cutting out EUIs in a sequence?

Where does return fuel exit a CELECT Plus injector after the injection pulse?

Technician A says that failure to reprogram injector calibration codes to the ECM after an EUI change-out result in unbalanced fueling. Technician B says that most OEMs require EUI calibration codes to be reprogrammed each time an injector is changed out. Who is correct?

Which of the following is NOT an advantage of pilot injection?

What what you be looking for when attempting to identify a Caterpillar E-Trim code?

Which of the following determines the length of a plunger effective stroke in a single actuator EUI?

Introduction

Hand and Shop Tools, Precision Tools, and Units of Measurement

Personal and Safety Awareness

Engine Basics

History of the Heat Engine

Power

Engine Powertrain Components

Engine Feedback Assembly

Engine Housing Components

Engine Lubrication Systems

Engine Cooling Systems

Engine Breathing

Engine Retarders

Servicing and Maintenance

Engine Removal, Disassembly, Cleaning,

Diesel Engine Run- in and Performance Testing

Chemistry and Combustion

Diesel Fuel Characteristics

Fuel Subsystems

Fuel Injection Basics and Governor Principles

Injector Nozzles

Port-Helix Metering Injection Pumps

Inlet-Metering Rotary Distributor Pumps

Sleeve-Metering Rotary Distributor Pumps

Dual-Actuator Eui Systems

Heui Fuel Systems

Electronic Unit Pump Eup Systems

Cummins Hpi-Tp

Common Rail Systems

Amplified Common Rail Systems

Review of Electrical and Electronics Fundamentals

Vehicle Computer Systems

Ests and Siss

Electrical Wiring, Connector Terminal Repair

Multiplexing

The Connected Vehicle

Natural Gas, Propane, and Biodiesel Fuels

High Voltage Electricity

Hybrid and Hydrogen Fuel Cell Drivetrains

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Caterpillar Engine Management Systems

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Detroit Diesel Electronic Controls Ddec

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