Question 1

In a nonelectronically controlled transmission, improper shift points are most commonly caused by a ______.

Accepted Answer

A faulty governor is the most common cause of improper shift points in a nonelectronically controlled transmission. The governor is responsible for sensing the vehicle's speed and sending a signal to the transmission to shift gears at the appropriate time. If the governor is faulty, it can send incorrect signals to the transmission, resulting in improper shift points.

Question 2

During a stall test, the engine speed was 50 rpm below the minimum stall speed. What is the most likely problem?

Accepted Answer

The most likely problem when the engine speed is 50 rpm below the minimum stall speed during a stall test is that the engine is not producing enough power. This condition indicates an issue with the engine's performance rather than a specific problem with the transmission components or the type of ATF used.

Question 3

Transmission rebuilding procedures are being discussed. Technician A says to always replace the internal drive chains. Technician B says to soak all friction material in clean ATF prior to installation. Who is correct?

Accepted Answer

Soaking all friction material in clean ATF prior to installation is a recommended practice to ensure proper lubrication and prevent burning out on initial startup. However, replacing internal drive chains is not always necessary unless they are worn or damaged.

Question 4

When should the ATF level be checked on most vehicles?

Accepted Answer

The correct procedure for checking the automatic transmission fluid (ATF) level in most vehicles is when the transmission is at operating temperature and the engine is running. This ensures accurate measurement since the fluid expands when warm and the pump, which operates only when the engine is running, affects the fluid level in the transmission.

Question 5

Two technicians are discussing transmission fluid. Technician A says transmission fluid is red in color and has no dark or metallic particles suspended in it. Technician B says synthetic ATF is normally a darker red than petroleum-based fluid and tends to look and smell burnt after normal use. Who is correct?

Accepted Answer

Both technicians are correct. Technician A is correct about the appearance of new transmission fluid, while Technician B is correct about the appearance of synthetic ATF after normal use.

Question 6

Incorrect pressure readings may reveal a possible problem in which of the following hydraulic circuits?

Accepted Answer

Incorrect pressure readings can indicate potential issues in any part of the hydraulic circuit, including the oil pump, governor, and servos, as they all play crucial roles in the system's pressure regulation and operation.

Question 7

Technician A says the only positive way to identify the exact design of the transmission is by the shape of its oil pan. Technician B says identification numbers only identify the manufacturer and assembly date of the transmission. Who is correct?

Accepted Answer

The shape of the oil pan can be a clue but is not the only way to identify a transmission's exact design; other factors such as identification numbers can provide detailed information about the model, manufacturer, and specifications, not just the manufacturer and assembly date.

Question 8

A low fluid level may be caused by a leak in all of the following EXCEPT:

Accepted Answer

The answer of A low fluid level may be caused...

Question 9

What tool is needed to perform a stall test?

Accepted Answer

A tachometer is needed to perform a stall test because it measures the engine's RPM (revolutions per minute), which is crucial for determining if the engine reaches the appropriate RPM level during the test.

Question 10

Technician A says delayed shifts may be caused by leaking hydraulic circuits. Technician B says poor engine performance can cause delayed shifts. Who is correct?

Accepted Answer

Both technicians are correct. Leaking hydraulic circuits can indeed cause delayed shifts in an automatic transmission by failing to build up sufficient pressure promptly. Poor engine performance can also lead to delayed shifts because the transmission's shift timing is often dependent on engine speed and load conditions.

Question 11

Swelling and bluing of the converter shell is a sign that the converter has been ______.

Accepted Answer

Swelling and bluing of the converter shell is a sign that the converter has been too hot. This is often due to excessive temperatures that can cause the metal to expand and change color.

Question 12

Technician A says driveline vibration that changes with engine speed can be caused by an unbalanced torque converter. Technician B says driveline vibration that changes with road speed can be caused by a bad universal joint. Who is correct?

Accepted Answer

Technician A is correct because an unbalanced torque converter, which is part of the vehicle's transmission system, can cause vibrations that vary with engine speed. Technician B is correct because a bad universal joint, which is part of the driveline, can cause vibrations that change with the vehicle's road speed.

Question 13

Installing the wrong transmission fluid can damage a transmission.

Accepted Answer

Using the incorrect type of transmission fluid can lead to lubrication issues, overheating, and increased friction, ultimately causing damage to the transmission.

Question 14

Technician A says a prerequisite to accurate road testing analysis includes knowing what bands and clutches are applied in a particular gear range. Technician B says slipping conditions can be caused by a leaking hydraulic circuit. Who is correct?

Accepted Answer

Both technicians are correct. Technician A is right because understanding which bands and clutches are applied in a specific gear range is essential for diagnosing transmission issues accurately during a road test. Technician B is correct because a leaking hydraulic circuit can lead to slipping conditions in the transmission, as it may not be able to build up sufficient pressure to engage the gears properly.

Question 15

Technician A says all automatic transmissions use the same type of fluid. Technician B says each manufacturer specifies the proper type of fluid that should be used in their transmissions. Who is correct?

Accepted Answer

Different manufacturers specify different types of fluid for their transmissions, making Technician B correct. Automatic transmission fluids are not universally the same across all makes and models.

Question 16

Technician A says that if the ATF has a dark brownish or blackish color and a burnt odor, the fluid has been overheated. Technician B says that if the fluid has a milky color, this indicates that engine coolant has been leaking into the transmission cooler. Who is correct?

Accepted Answer

The answer of Technician A says that if the ATF...

Question 17

Technician A says a low fluid level can cause fluid aeration. Technician B says a high fluid level can cause fluid aeration. Who is correct?

Accepted Answer

Both low and high fluid levels can cause fluid aeration. A low fluid level can introduce air into the system due to insufficient fluid to cover the intake, while a high fluid level can lead to churning of the fluid, which also introduces air.

Question 18

Technician A says thumps and grinding noises are often caused by bad thrust washers. Technician B says that noise that is related to engine speed and occurs in all gear ranges, including park and neutral, is likely caused by a bad planetary gearset. Who is correct?

Accepted Answer

The answer of Technician A says thumps and grinding noises...

Question 19

With the cooler return line disconnected, how much fluid should flow through the cooler during a 20-second test?

Accepted Answer

The answer of With the cooler return line disconnected, how...

Question 20

Two technicians are discussing band adjustment. Technician A says the band adjustment screws are located on the outside of the transmission case. Technician B says the band adjustment screws are located inside the transmission and the transmission pan must be removed to make the adjustments. Who is correct?

Accepted Answer

Band adjustment screws can be located both on the outside of the transmission case and inside, requiring the removal of the transmission pan for access. This means both Technician A and Technician B are correct, as the location can vary depending on the design of the transmission.

Quiz 43: Automatic Transmission and Transaxle Service