Week #3 - RoadRanger: Theory of Operation (Chapter 20)

Question 1

True or False: AMT fault codes can be accessed by connecting to the chassis data bus.

Answer 1

True

Question 2

Which of the following components is responsible for effecting shifts in the transmission auxiliary box?
a. the reverse switch
b. the range valve solenoid
c, the rail select motor
d. the power module

Answer 2

b. the range valve solenoid

Question 3

True or False: The UltraShift AMT uses a pneumatic clutch actuator.

Answer 3

False

Question 4

What component on an Eaton AMT performs the mechanical function of the shift lever on the standard Roadranger transmission?

Answer 4

The shift finger

Question 5

True or False: The motor-generator used in an Eton hybrid-electric transmission can be driven by AC.

Answer 5

True

Question 6

True or False: The Detroit DT-12 AMT uses a pneumatic clutch actuator.

Answer 6

True

Question 7

True or Falses: An Eton AMT will not shift out of second gear, therefore when the AMT is in downshift fallback, only downshifts can be made until the vehicle is brought to a standstill.

Answer 7

True

Question 8

What component in the AutoShift system protects the circuit electrical and electronic systems from voltage spikes by acting as an electronic voltage regulator?

Answer 8

A reverse voltage zener diode

Question 9

True or False: When an AMT is described as three-pedal, the clutch pedal is eliminated.

Answer 9

False

Question 10

What AMT identification letters indicate that an UltraShift transmission uses a wet clutch?

Answer 10

AW

Question 11

What component does a three-pedal AMT have that is not used on a two-pedal system?

Answer 11

A clutch pedal

Question 12

When a five-speed fallback fault is displayed by Eaton AMT electronics, where is the source of the fault?

Answer 12

Auxiliary section

Question 13

True or False: AMT faults can only be read by the OEM software.

Answer 13

False

Question 14

True or False: The motor-generator used in an Eton hybrid electric transmission generates AC.

Answer 14

True

Question 15

True or Falses: An Eton AMT will not shift out of second gear, therefore an in-place (logged) fallback failure strategy could be the cause.

Answer 15

True

Question 16

What letters in the suffix of the Eaton Roadranger transmission serial number indicate that the transmission is an UltraShift AMT?

Answer 16

DM

Question 17

What is the usual location of an Eaton AMT ECU?

Answer 17

On the left side of the transmission

Question 18

What type of sensor is used to signal shift finger position to the transmission ECU in a current Eaton AMT?

Answer 18

A Hall effect sensor

Question 19

Which of the following correctly describes the gear select motor used on an AutoShift transmission?

a. an unidirectional AC motor
b. a reversing AC motor
c. a reversing DC motor
d. an unidirectional DC motor

Answer 19

c. a reversing DC motor

Question 20

To what Eaton AMT component is the driver shift lever signal command directed?

Answer 20

The transmission ECU

Question 21

What is the function of the inertia brake used in the AutoShift transmission?

Answer 21

It slows the countershaft during initial engagement.

Question 22

True or False: When an AMT is described as a two-pedal system, the clutch is eliminated.

Answer 22

False

Question 23

What AMT identification letters indicate that an UltraShift is equipped with a centrifugal clutch?

Answer 23

DM

Question 24

What is the energy storage device used in an Eaton HLA transmission?

Answer 24

Nitrogen gas loaded accumulator

Question 25

What would be the performance outcome if an Eaton AMT defaults to one-speed fallback mode?

Answer 25

All shifting is inhibited