Question 1

What does the transmission use to attain the different gear ratios?

Accepted Answer

C

Question 2

Choose the correct statement with respect to solenoids.

Accepted Answer

The shift solenoids do not directly act on the transmission clutches. Rather they move valves in the valve body.

Question 3

The resistance value of the torque converter clutch solenoid is:

Accepted Answer

The typical resistance value for a torque converter clutch solenoid is usually in the range of 8-15 ohms.

Question 4

All of the following statements with respect to the speed sensors are true except:

Accepted Answer

The answer of All of the following statements with respect...

Question 5

The internal filter needs to be changed:

Accepted Answer

The answer of The internal filter needs to be changed:
...

Question 6

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?

Accepted Answer

The answer of Tech A states that Allison transmissions use...

Question 7

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?

Accepted Answer

The answer of You test the line pressure on an...

Question 8

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?

Accepted Answer

The answer of Tech A states that the shift solenoids...

Question 9

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?

Accepted Answer

One trim solenoid is normally open, while the other is normally closed.

Question 10

A vehicle with an Allison transmission comes in to the shop with a code for a crankshaft speed sensor. Tech A states that the torque converter may be damaged. Tech B states that the code may indicate the transmission is slipping. Who is correct?

Accepted Answer

The crankshaft speed sensor is used to determine the engine speed. If the crankshaft speed sensor is not working properly, the transmission may not be able to shift gears correctly. This can lead to the torque converter being damaged.

Question 11

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?

Accepted Answer

The internal filter of an Allison transmission is typically not changed at every fluid service, and the external filter should be changed more than just during the first service.

Question 12

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?

Accepted Answer

The answer of A vehicle with an Allison transmission comes...

Question 13

You are testing the solenoids on an Allison transmission and find the resistance of the trim solenoids to be 12.3 ohms. Tech A states that the solenoids need to be replaced. Tech B states that the resistance should be higher than 12.3 ohms. Who is correct?

Accepted Answer

The resistance of the trim solenoids should be between 10-15 ohms. 12.3 ohms is within this range, so the solenoids do not need to be replaced.

Question 14

An Allison transmission comes in to the shop with ratio error codes for all gears. Tech A states that the transmission output shaft speed sensor could be faulty. Tech B states that the output shaft speed sensor can be checked with a DC voltmeter. Who is correct?

Accepted Answer

The transmission output shaft speed sensor could indeed be faulty, causing ratio error codes.

Question 15

A vehicle with an Allison transmission comes in with slipping 4th, 5th and 6th gears. Tech A states that the problem could be a burned C1 clutch. Tech B states that the problem could be a bad shift solenoid. Who is correct?

Accepted Answer

The answer of A vehicle with an Allison transmission comes...

Question 16

In order to remove the manual linkage from the transmission, the roll pin will need to be removed using a:

Accepted Answer

The answer of In order to remove the manual linkage...

Question 17

For how long should all frictions be soaked in the specified automatic transmission fluid before being installed into the transmission?

Accepted Answer

Friction materials should be soaked in automatic transmission fluid for at least 15 minutes to ensure proper lubrication and performance when installed.

Question 18

All of the following can be used in cleaning a valve except:

Accepted Answer

The answer of All of the following can be used...

Question 19

When installing the bell housing onto the pump, the bolts should be torqued to:

Accepted Answer

The answer of When installing the bell housing onto the...

Question 20

When installing the main shaft, if the shoulder of the main shaft sticks up more than 0.100 inches from the planet carrier shaft:

Accepted Answer

Rotating the main shaft can help it seat properly if it is not aligned correctly, which might be causing it to stick up.

Quiz 28: Allison 1000 and 2000 Series Transmissions