Question 1

What electronic control module is used to control the shifting of an electronically controlled automatic transmission/ transaxle?

Accepted Answer

The electronic control module used to control the shifting of an electronically controlled automatic transmission/transaxle can be a Transmission Control Unit (TCU), Powertrain Control Module (PCM), or Transmission Control Module (TCM), depending on the specific application and design of the vehicle.

Question 2

A transmission control module (TCM) has just been replaced. Which parameters should be programmed into the TCM using a scan tool?

Accepted Answer

Tire size needs to be programmed into the TCM to ensure accurate transmission shift points and speedometer readings.

Question 3

What type of sensor measures speed?

Accepted Answer

Frequency generators, also known as tachometers, are designed specifically to measure the speed of an object or system. They generate electrical signals that are proportional to the speed of the system being measured, making them an ideal choice for speed measurement applications.

Question 4

The transmission range (TR) switch is used to ________.

Accepted Answer

The transmission range (TR) switch performs multiple functions. It prevents the engine from starting in any gear position except park or neutral, operates the backup lights in reverse, and limits upshifts in manual ranges. Therefore, all of the above choices are correct.

Question 5

The input speed sensor is also called a ________.

Accepted Answer

The input speed sensor is commonly referred to as the turbine speed sensor (TSS), which measures the speed of the transmission's input shaft.

Question 6

The output speed sensor is also called a ________.

Accepted Answer

The answer of The output speed sensor is also called...

Question 7

What type of sensor is the transmission fluid temperature (TFT) sensor?

Accepted Answer

The transmission fluid temperature (TFT) sensor is a type of Negative Temperature Coefficient (NTC) thermistor that changes resistance based on the temperature of the fluid it is monitoring.

Question 8

Linear solenoids are used for ________.

Accepted Answer

Linear solenoids can be used for various applications depending on the type of solenoid and the specific application requirements. Some of the common applications include torque converter clutch (TCC) solenoids for controlling the engagement and disengagement of the clutch, shifting solenoids for controlling the transmission gear changes, and pressure control solenoids for regulating pressure in hydraulic systems. Therefore, option D is the best choice as it encompasses all the above applications.

Question 9

What does the electronic pressure control (EPC) solenoid use to control mainline pressure?

Accepted Answer

The electronic pressure control (EPC) solenoid uses current to control the mainline pressure in a transmission. The amount of current supplied to the solenoid determines the position of the valve, which in turn regulates the hydraulic pressure.

Question 10

Adaptive control means ________.

Accepted Answer

Adaptive control refers to the ability of a system to adjust or adapt its behavior to changing conditions or external factors. In the case of automatic transmissions, adaptive control refers to the ability of the system to monitor and adjust the timing and pressure of the shift points in order to compensate for wear or other changes in the transmission components. This allows for smoother shifts and better overall performance over time. Therefore, the best choice is D - the change in the pressure or timing to keep the shift occurring at the same time to make up for wear.

Question 11

What type of sensor measures temperature?

Accepted Answer

A thermistor is a type of sensor that measures temperature by monitoring the change in resistance of a circuit as the temperature changes. Frequency generators, transducers, and potentiometers are not typically used for temperature measurement.

Question 12

Technician A says that the transmission control module may be located inside the transmission. Technician B says that in most electronically controlled transmissions, shifting is controlled by solenoids. Who is correct?

Accepted Answer

Technician A is correct that the transmission control module may be located inside the transmission. Technician B is also correct that in most electronically controlled transmissions, shifting is controlled by solenoids. Therefore, both technicians A and B are correct.

Question 13

The controlling unit for an electronically shifted transmission is the ________.

Accepted Answer

The TCM, or transmission control module, is the controlling unit for an electronically shifted transmission. It receives signals from various sensors, such as the vehicle speed sensor and throttle position sensor, to determine when and how to shift gears.

Question 14

A ________ is an electromagnetic device that can be used to control fluid pressure in a hydraulic circuit.

Accepted Answer

A solenoid is an electromagnetic device that can be used to control fluid pressure in a hydraulic circuit. The other options listed are not directly related to controlling fluid pressure in a hydraulic circuit.

Question 15

If the solenoids fail in a transmission with electronic shift controls, the transmission will ________.

Accepted Answer

If the solenoids fail in a transmission with electronic shift controls, the transmission will operate in only one gear. The solenoids are responsible for controlling the flow of transmission fluid to different clutch packs and bands, which allow the transmission to change gears. If a solenoid fails, it may not allow the transmission to shift properly, which can result in the transmission being stuck in one gear. However, the transmission itself should not be ruined if the car is driven.

Question 16

Technician A says that the transmission range switch is located in the shift console Technician B says that the transmission range switch is operated by the manual shift linkage. Who is correct?

Accepted Answer

The transmission range switch, also known as the neutral safety switch, is typically operated by the manual shift linkage or directly connected to the transmission, indicating Technician B's statement is correct. Technician A's statement is less accurate as the switch is usually not located in the shift console but rather on or inside the transmission.

Question 17

The vehicle speed sensor is located ________.

Accepted Answer

The vehicle speed sensor is usually located at the transmission output shaft because it senses the speed of the vehicle's wheels through the rotation of the output shaft.

Question 18

The transmission pressure switches are located at the ________.

Accepted Answer

The transmission pressure switches are located at the valve body of the transmission, which is responsible for controlling the flow of transmission fluid and shifting gears. They play a crucial role in measuring the pressure levels within the transmission system and relaying that information to the engine control module for proper transmission operation.

Question 19

Technician A says that the transmission control system can communicate with diagnostic test equipment. Technician B says that most late model control systems can run pre-programmed system diagnostics and generate trouble codes. Who is correct?

Accepted Answer

Both technicians are correct. The transmission control system can communicate with diagnostic test equipment, and most late model control systems can run pre-programmed system diagnostics and generate trouble codes.

Question 20

Technician A says that electronic transmissions may control shifts by applying shift solenoid output directly to the bands and clutches. Technician B says that electronic transmissions may control shifts by directing the shift solenoid output pressure to the shift valves. Who is correct?

Accepted Answer

Technician B is correct because electronic transmissions typically control shifts by directing the shift solenoid output pressure to the shift valves, which then control the application of bands and clutches. Technician A's statement is incorrect as solenoids do not apply pressure directly to bands and clutches.

Quiz 25: Electronic Transmission Controls