Question 1

Technician A says that delayed shifts could be caused by a malfunctioning Throttle Position Sensor (TPS). Technician B says that TPS data can be used to determine clutch slippage. Who is correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Accepted Answer

A malfunctioning Throttle Position Sensor (TPS) can indeed cause delayed shifts because it provides critical input to the transmission control module for shift timing. However, TPS data is not typically used to determine clutch slippage, making Technician B incorrect.

Question 2

Throttle Position Sensors (TPS) typically return around 0.5V when the throttle is closed, and approximately 4.5V when the throttle is wide open.

Accepted Answer

Throttle Position Sensors (TPS) are designed to output a voltage range from about 0.5V at closed throttle to approximately 4.5V at wide open throttle, allowing the engine control unit to determine the throttle position.

Question 3

Where is the Throttle Position Sensor (TPS) mounted?
A) Transmission range shaft
B) Engine throttle body assembly
C) On the accelerator pedal assembly
D) None of the above

Accepted Answer

The Throttle Position Sensor (TPS) is typically mounted on the engine throttle body assembly to monitor the position of the throttle valve.

Question 4

Two technicians are discussing electronically controlled automatic transmissions. Technician A says a Throttle Position Sensor (TPS) is supplied a steady 5V reference voltage from the Powertrain Control Module (PCM). Technician B says most Throttle Position Sensors (TPS) have high resistance at closed throttle, dropping most of the 5V reference voltage to near zero volts. Who is correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Accepted Answer

The answer of Two technicians are discussing electronically controlled automatic...

Question 5

Where are Throttle Position Sensors (TPS) mounted?
A) Transmission range shaft
B) Engine throttle body assembly
C) Manual valve assembly
D) Accelerator pedal assembly

Accepted Answer

Throttle Position Sensors (TPS) are mounted on the engine throttle body assembly to monitor the position of the throttle valve.

Question 6

The ________ is a type of variable resistor called a potentiometer.
A) Throttle position sensor
B) Vehicle speed sensor
C) Wheel speed sensor
D) Input shaft speed sensor

Accepted Answer

A throttle position sensor is a type of variable resistor known as a potentiometer, which measures the position of the throttle in an internal combustion engine.

Question 7

Two technicians are discussing electronically controlled automatic transmissions. Technician A says a Throttle Position Sensor (TPS) is supplied a reference voltage from the Powertrain Control Module (PCM). Technician B says most TPS's have a relatively high resistance at closed throttle, reducing the reference voltage. Who is correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Accepted Answer

The answer of Two technicians are discussing electronically controlled automatic...

Question 8

Technician A says that a faulty TPS can cause a transmission to have erratic shifting. Technician B says that a TPS operation should be verified with a DSO. Who is correct?
A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Accepted Answer

A faulty Throttle Position Sensor (TPS) can indeed cause erratic shifting in a transmission because it provides critical input for shift timing. Additionally, a Digital Storage Oscilloscope (DSO) is an effective tool for verifying the operation of a TPS by displaying its voltage signal over time.

Question 9

Technician A says that a TPS signal is an important input used by the PCM to determine transmission operation. Technician B says that scan tool data is the best way to verify TPS operation. Who is correct?
A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Accepted Answer

The answer of Technician A says that a TPS signal...

Question 10

The TPS is an input that measures the angle of the throttle assembly.

Accepted Answer

The Throttle Position Sensor (TPS) is a device that measures the angle of the throttle valve in an internal combustion engine, providing input to the engine control unit.

Question 11

Technician A says that a TPS sensor input is used by either the PCM or the TCM. Technician B says that in a modern fly by wire vehicle, there are at least two, possibly three, TPS sensors that report throttle position. Who is correct?
A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Accepted Answer

Technician A is correct because the Throttle Position Sensor (TPS) input is used by both the Powertrain Control Module (PCM) and the Transmission Control Module (TCM) to manage engine and transmission functions. Technician B is also correct because modern fly-by-wire systems often use multiple TPS sensors for redundancy and accuracy in reporting throttle position.

Question 12

Which of the following is the type of sensor used to measure transmission line pressure?
A) Pressure transformer
B) Pressure transducer
C) Photoresistor
D) Potentiometer

Accepted Answer

A pressure transducer is a device that converts pressure into an electrical signal, making it suitable for measuring transmission line pressure.

Question 13

The line pressure sensor in an automatic transmission is supplied with reference voltage from the PCM.

Accepted Answer

The Powertrain Control Module (PCM) typically supplies a reference voltage to sensors, including the line pressure sensor, to ensure accurate readings for transmission control.

Question 14

In an electronically controlled automatic transmission, which of the following sensors changes resistance based upon the regulated hydraulic pressure output from the front pump?
A) Transmission pressure switch
B) Transmission fluid temperature switch
C) Line pressure sensor
D) None of the above

Accepted Answer

The line pressure sensor changes resistance based on the regulated hydraulic pressure output from the front pump, providing feedback to the transmission control module.

Question 15

A line pressure sensor is a transducer that varies resistance with the pressure applied to the sensor element.

Accepted Answer

A line pressure sensor is a type of transducer that changes its electrical resistance in response to pressure changes, allowing it to measure and transmit pressure data.

Question 16

Automatic transmission line pressure that is sent to the governor is allowed to be exhausted back to the transmission pan when the vehicle is not moving and the governor is not creating any pressure.

Accepted Answer

When the vehicle is not moving, the governor is not spinning, and thus not creating pressure, allowing the line pressure to be exhausted back to the transmission pan.

Question 17

Which of the following is a pressure transducer?
A) Electric-only propulsion
B) Manual lever position (MLP) switch
C) Overdrive switch
D) Line pressure sensor

Accepted Answer

A line pressure sensor is a type of pressure transducer that measures the pressure within a fluid line, converting it into an electrical signal for monitoring or control purposes.

Question 18

Technician A says that the EPC solenoid controls line pressure. Technician B says that if an EPC fails, it will default to minimum line pressure. Who is correct?
A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Accepted Answer

The answer of Technician A says that the EPC solenoid...

Question 19

The __________ sends a signal to the PCM so that the line pressure can be adapted to change shift timing based on current pressure readings.
A) Line pressure sensor
B) Clutch pressure sensor
C) Transmission fluid temperature sensor
D) Transmission pressure switch assembly

Accepted Answer

The line pressure sensor sends a signal to the Powertrain Control Module (PCM) to adapt line pressure and change shift timing based on current pressure readings.

Question 20

Line pressure sensors are being discussed. Technician A says the line pressure sensor is a pressure transducer. Technician B says the sensor is a potentiometer. Who is correct?
A) Technician A
B) Technician B
C) Both Technicians A and B
D) Neither Technician A nor B

Accepted Answer

Technician A is correct because a line pressure sensor is typically a pressure transducer, which converts pressure into an electrical signal. A potentiometer is not used for measuring pressure.

Quiz 11: Electronically Controlled Transmission

Technician A says that delayed shifts could be caused by a malfunctioning Throttle Position Sensor (TPS) . Technician B says that TPS data can be used to determine clutch slippage. Who is correct?

Throttle Position Sensors (TPS) typically return around 0.5V when the throttle is closed, and approximately 4.5V when the throttle is wide open.

Where is the Throttle Position Sensor (TPS) mounted?

Where are Throttle Position Sensors (TPS) mounted?

The ________ is a type of variable resistor called a potentiometer.

Technician A says that a faulty TPS can cause a transmission to have erratic shifting. Technician B says that a TPS operation should be verified with a DSO. Who is correct?

Technician A says that a TPS signal is an important input used by the PCM to determine transmission operation. Technician B says that scan tool data is the best way to verify TPS operation. Who is correct?

The TPS is an input that measures the angle of the throttle assembly.

Technician A says that a TPS sensor input is used by either the PCM or the TCM. Technician B says that in a modern fly by wire vehicle, there are at least two, possibly three, TPS sensors that report throttle position. Who is correct?

Which of the following is the type of sensor used to measure transmission line pressure?

The line pressure sensor in an automatic transmission is supplied with reference voltage from the PCM.

In an electronically controlled automatic transmission, which of the following sensors changes resistance based upon the regulated hydraulic pressure output from the front pump?

A line pressure sensor is a transducer that varies resistance with the pressure applied to the sensor element.

Automatic transmission line pressure that is sent to the governor is allowed to be exhausted back to the transmission pan when the vehicle is not moving and the governor is not creating any pressure.

Which of the following is a pressure transducer?

Technician A says that the EPC solenoid controls line pressure. Technician B says that if an EPC fails, it will default to minimum line pressure. Who is correct?

The __________ sends a signal to the PCM so that the line pressure can be adapted to change shift timing based on current pressure readings.

Line pressure sensors are being discussed. Technician A says the line pressure sensor is a pressure transducer. Technician B says the sensor is a potentiometer. Who is correct?