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Exam 28: Allison 1000 and 2000 Series Transmissions

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Question 31

Multiple Choice

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Tech A states that the two trim solenoids on an Allison transmission are both normally closed. Tech B states that one trim solenoid is normally open, while the other is normally closed. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

E) None of the above
F) B) and C)

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Question 32

Multiple Choice

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You test the line pressure on an Allison transmission and find that the pressure is only 90 psi (621 kPa) in all gears. Tech A states that solenoid A could be in fail safe. Tech B states that solenoid B may not be energized. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

E) A) and D)
F) All of the above

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Question 33

Multiple Choice

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Technician A says that the diesel engine equipped Allison 1000 transmission uses an engine speed sensor. Technician B says the engine speed sensor is not used on gasoline powered engines. Who is correct?

What is the resistance value of trim A solenoid?

Choose the correct statement with respect to solenoids.

Technician A says that the Allison 1000 transmission contains four shift solenoids. Technician B says that the Allison 1000 contains two trim solenoids. Who is correct?

Technician A says that the Allison 1000 transmission contains four shift solenoids. Technician B says that the Allison 1000 contains two trim solenoids. Who is correct?

Two technicians are discussing transmission service on an Allison transmission. Tech A states that the internal filter should be changed every fluid service. Tech B states that the external filter is only changed during the first service. Who is correct?

The trim solenoids were renamed pressure control solenoids after a few years.

How many return springs are located behind the C4 clutch apply plate of an Allison 1000/2000 transmission?

The torque converter clutch solenoid of an Allison transmission operates on a frequency of ________

How many sealing rings need to be replaced on the back of an Allison transmission pump?

Tech A states that the two trim solenoids on an Allison transmission are both normally closed. Tech B states that one trim solenoid is normally open, while the other is normally closed. Who is correct?

Tech A states that Allison transmissions use two trim solenoids to control pressure. Tech B states that the transmission uses two pressure control solenoids. Who is correct?

The internal filter needs to be changed:

A vehicle with an Allison transmission comes in to the shop with poor acceleration and no reverse. You test drive the vehicle and determine that there is no 1st or reverse gear. Tech A states that the problem could be a bad C3 clutch. Tech B states that the problem could be a bad C5 clutch. Who is correct?

What is the resistance value of trim A solenoid?

The output pressure of trim solenoid A of an Allison transmission is at 0 psi. Tech A states that the solenoid could be in failsafe mode. Tech B states that solenoid may have full current. Who is correct?

Tech A states that the solenoids of an Allison transmission use pulse width modulation. Tech B states that the solenoids do not use pulse width modulation. Who is correct?

Tech A states that the shift solenoids in an Allison transmission are pulse width modulated to control the shift feel. Tech B states that the trim solenoids are proportional current solenoids. Who is correct?