Deck 20: Electronically Automated Standard Transmissions

Question 1

Eaton AMT electronics are protected against which of the following circuit malfunctions?

A) voltage spikes
B) current overloads
C) reverse voltage
D) all of the above

Answer 1

D

Question 2

Which of the following is NOT classified as an automated manual transmission (AMT)?

A) Allison WT
B) RoadRanger AutoShift
C) Arvin Meritor FreedomLine
D) Mercedes Benz AGS

Answer 2

A

Question 3

Which of the following AutoShift components are interchangeable?

A) rail-select and gear-select ball screws
B) rail-select and gear-select motors
C) both A and B
D) neither A nor B

Answer 3

D

Question 4

Technician A says current versions of the AutoShift AMTs use a single-module controller.Technician B says that a disadvantage of current AutoShift AMTs is that the controller cannot be networked to a J1939 data bus.Who is correct?

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

Question 5

What is an inductive pulse generator used for in an AutoShift AMT?

A) shaft speed signaling
B) rail position sensing
C) moving shift fingers
D) shift shaft positioning

Question 6

Technician A says that a function of the power management electronics used with Eaton AMTs is to protect the ECU from voltage spikes that exceed 32 V-DC.Technician B says that the transmission ECU is located on the left side of current versions of RoadRanger AMTs.Who is correct?

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

Question 7

What is used to signal rail position in current versions of AutoShift transmissions?

A) Hall-effect sensors
B) potentiometers
C) variable capacitance sensors
D) inductive pulse generators

Question 8

When a one-speed fallback failure occurs,which of the following is usually true?

A) the fault is in the auxiliary section
B) all shifting is inhibited
C) only downshifts are possible
D) a covert code is logged

Question 9

How often is an Eaton AMT electric shifter assembly calibrated?

A) each time the ignition key is turned off
B) each time the ignition key is turned on
C) whenever a fault code is logged
D) whenever a technician accesses the data bus

Question 10

Which of the following best describes the function of the gear select sensor in an Eaton AMT?

A) shifts the rail shaft
B) signals the rail select motor
C) monitors shift finger position
D) positions the shift finger

Question 11

When an AMT is J1939 multiplexed to the chassis data bus,which of the following is true?

A) transmission electronics are networked to the chassis data backbone
B) input hardware can be shared with other electronic systems on data bus
C) transmission can both broadcast and receive information from other chassis systems
D) all of the above

Question 12

When are both sides of the Eaton AMT range cylinder exhausted to atmosphere?

A) low range
B) all off phase
C) high range
D) all on phase

Question 13

Where would you find inductive pulse generators in Eaton AMTs?

A) input shaft speed sensor
B) output shaft speed sensor
C) mainshaft speed sensor
D) all of the above

Question 14

What electrical principle is used in an Eaton RoadRanger AMT gear shift selector?

A) smart switch
B) Hall-effect
C) potentiometer
D) rheostat

Question 15

Technician A says that fault codes can be numerically blinked using the transmission wait light on current versions of AutoShift.Technician B says that when the transmission service light flashes,the system has logged a fault code.Who is correct?

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

Question 16

Which of the following is true of the main box used on an Eaton AMT?

A) single-countershaft
B) twin-countershaft
C) triple-countershaft
D) compound planetary gearset

Question 17

Which of the following AutoShift components replaces the Hi-Lo flipper switch used on non-automated,RoadRanger transmissions?

A) slave valve
B) master valve
C) range valve
D) detente valve

Question 18

Which of the following is true of the function of an Eaton RoadRanger AMT electric shifter assembly?

A) moves the shift finger transversely into one of the three rails
B) moves the ball screw block on the gear select yoke
C) actuates the shift shaft to move forward or rearward
D) all of the above

Question 19

Which of the following AMT components must be calibrated before a truck is placed in service?

A) input shaft speed sensor
B) inertia
C) tailshaft speed sensor
D) shifter module

Question 20

What is the nominal torque rating of an AutoShift transmission with a RTAO-14710B-AS serial number?

A) 1450 lb-ft
B) 147 lb-ft
C) 710 lb-ft
D) 4710 lb-ft

Question 21

When removing an inertia brake from an Eaton AMT,which of the following must be done first?

A) remove the transmission from the chassis
B) disconnect the vehicle battery bank
C) remove the transmission air/filter regulator
D) remove the transmission ECU

Question 22

Technician A says that a self-adjusting,system-actuated clutch is used with a ZF Meritor FreedomLine transmission.Technician B says that Mercedes AGS troubleshooting is performed using Freightliner ServicePro software.Who is correct?

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

Question 23

Technician A says that the first step in troubleshooting Eaton AMT complaints should always be to identify any logged fault codes.Technician B says that an AutoShift pretest requires that the technician check the electrical and pneumatic inputs to the transmission before progressing to more detailed troubleshooting.Who is correct?

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

Question 24

Which of the following AMTs are two-pedal systems?

A) UltraShift
B) Mercedes AGS
C) FreedomLine
D) all of the above

Question 25

What is used to change the direction that rail select or gear select motors turn at in an Eaton AMT?

A) DC polarity
B) AC frequency
C) pulse width modulation on-off time
D) motor turning direction is CW only

Question 26

Which SA on a J1939 chassis data bus is assigned to the transmission electronics?

A) 00
B) 03
C) 01
D) 08

Question 27

Technician A says that an in-place fallback could mean the transmission remains stuck in neutral.Technician B says that an in-place fallback could mean the transmission remains stuck in a specific gear ratio.Who is correct?

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

Question 28

Technician A says that Eaton electronics power up all transmission sensors at V-Bat.Technician B says that the Hall-effect sensors used to signal shift rail position require a 5-volt V-Ref input.Who is correct?

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

Question 29

What servo force is used to engage an Eaton AMT inertia brake?

A) electrical force
B) air pressure
C) hydraulic force
D) mechanical force

Question 30

What is used to signal rail position in early versions of AutoShift AMTs?

A) Potentiometers
B) Hall-effect sensors
C) Variable capacitance sensors
D) Inductive pulse generators

Question 31

Technician A says that the inertia brake used on RoadRanger AMTs is located on the underside of the transmission.Technician B says that the inertia brake is hydraulically actuated.Who is correct?

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

Question 32

When a five-speed fallback condition has occurred which of the following is true?

A) fault is in auxiliary section
B) main section is fully operational
C) shifting is limited to 5-speeds
D) all of the above

Question 33

Technician A says that multiplexing enables the transmission and engine to precisely synchronize engine and transmission shaft speeds for shift events.Technician B says that multiplexing communication betwen the engine and transmission makes the clutch unnecessary in AMTs.Who is correct?

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

Question 34

Technician A says that in downshift fallback mode,AutoShift only permits downshifts.Technician B says that when a transmission is in downshift fallback mode,it cannot be shifted out of neutral.Who is correct?

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

Question 35

Technician A says that in the event of a loss of chassis electricity,an Eaton AMT will default to mechanical operation.Technician B says that so long as the engine continues to run,the output shaft on an Eaton AMT must rotate.Who is correct?

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

Question 36

What is used to stop the countershafts for a shift in a RoadRanger AMT if the clutch is either defective or out of adjustment?

A) nothing,gear clash will result
B) inertia brake
C) clutch brake
D) snubber valve

Question 37

What is the creep feature used on an Eaton wet clutch known as?

A) Urge-to-Move
B) auto-creep
C) converter stall
D) driveline stall

Question 38

Technician A says that Eaton GEN III electronics will prevent a driver from making a shift that could result in transmission damage.Technician B says that when an Eaton AMT service light flashes a code 25,the transmission should be immediately pulled from service.Who is correct?

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

Question 39

What gear oil is recommended by Eaton for use in their AMTs?

A) 40W Military spec mineral oil
B) synthetic E-500
C) Dexron II
D) 5W-40 engine oil

Question 40

Technician A says that the first generation of Eaton AMTs used a two module transmisson control system.Technician B says that current versions of Eaton AMTs use a single ECU to manage all transmission functions.Who is correct?

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