Question 1

The PCM monitors the brake on/off switch to control TCC operation.

Accepted Answer

The Powertrain Control Module (PCM) uses the brake on/off switch signal to determine when to engage or disengage the Torque Converter Clutch (TCC) to ensure proper vehicle operation and safety.

Question 2

The brake light switch is a normally open switch that closes when the brake pedal is depressed.

Accepted Answer

A brake light switch is designed to close the circuit and activate the brake lights when the brake pedal is pressed, indicating that it is a normally open switch.

Question 3

Technician A says that the brake light switch may be a separate switch from the brake on/off switch. Technician B says that the brake switch may also be used to put the vehicle transmission in neutral. Who is correct?

Accepted Answer

Both technicians are correct. The brake light switch is often a separate switch from the brake on/off switch, and it may also be used to put the vehicle transmission in neutral.

Question 4

A brake on/off switch can be used to control transmission shifting when at a stop light.

Accepted Answer

A brake on/off switch can signal the vehicle's transmission control module to prevent shifting out of park or into gear unless the brake pedal is pressed, enhancing safety at stop lights.

Question 5

Technician A says that as soon as the brake pedal is depressed, the TCC is released to prevent drag and engine stalling. Technician B says that when the brake pedal is depressed, the PCM engages the TCC. Who is correct?

Accepted Answer

Technician A is correct because the Torque Converter Clutch (TCC) is typically released when the brake pedal is depressed to prevent drag and engine stalling.

Question 6

When the Powertrain Control Module (PCM) receives the brake switch input, what does the PCM do with the Torque Converter Clutch (TCC)?

Accepted Answer

The PCM disengages the Torque Converter Clutch (TCC) when it receives the brake switch input to ensure smooth deceleration and prevent stalling.

Question 7

Some transmissions shift into overdrive and engage the torque converter clutch when the brake input is received by the Powertrain Control Module (PCM).

Accepted Answer

The brake input typically signals the PCM to disengage the torque converter clutch, not engage it, to allow for smoother deceleration.

Question 8

If the transmission is designed to shift to neutral at a stop for fuel economy, the transmission will engage 1st gear as soon as the brake pedal is released.

Accepted Answer

The answer of If the transmission is designed to shift...

Question 9

Technician A says the brake switch is not used to control the Torque Converter Clutch (TC clutch disengagement). Technician B says the Powertrain Control Module (PCM) responds to the brake switch input by disengaging the TCC. Who is correct?

Accepted Answer

The Powertrain Control Module (PCM) uses the brake switch input to disengage the Torque Converter Clutch (TCC) when the brakes are applied, making Technician B correct.

Question 10

Technician A says the brake on/off switch is used to control the Torque Converter Clutch (TC disengagement). Technician B says on some newer vehicles, the brake switch is also used to put the transmission in neutral while idling at a stop light. Who is correct?

Accepted Answer

Technician A is correct because the brake on/off switch is indeed used to disengage the Torque Converter Clutch (TCC) when the brakes are applied. Technician B is also correct as some newer vehicles use the brake switch to engage a feature that puts the transmission in neutral while idling to improve fuel efficiency.

Question 11

The PCM uses the __________ to determine engine speed.

Accepted Answer

The CKP (Crankshaft Position Sensor) is used by the PCM (Powertrain Control Module) to determine engine speed by monitoring the position and rotational speed of the crankshaft.

Question 12

Which of the following is NOT a style of CKP sensor designs?

Accepted Answer

All of the above are styles of CKP sensor designs.

Question 13

The CKP sensor is used to determine torque converter slippage.

Accepted Answer

The answer of The CKP sensor is used to determine...

Question 14

Technician A says that the input shaft speed sensor is compared to the crankshaft position sensor to determine slippage between the turbine and the impeller. Technician B says that the CKP sensor is used to monitor engagement of the torque converter clutch. Who is correct?

Accepted Answer

The answer of Technician A says that the input shaft...

Question 15

Most torque converter clutches are pulsed slowly to avoid a harsh engagement.

Accepted Answer

Torque converter clutches are often pulsed slowly to ensure a smooth transition and avoid harsh engagement, which can lead to driveline shock and discomfort.

Question 16

Technician A says that the PCM monitors the speed of the input shaft and the crankshaft to slowly lock the converter clutch. Technician B says that the TCC is controlled only by the brake light switch. Who is correct?

Accepted Answer

The answer of Technician A says that the PCM monitors...

Question 17

Regardless of the design style of the CKP, its purpose is to send a signal to the PCM to determine camshaft speed.

Accepted Answer

The CKP (Crankshaft Position Sensor) is used to monitor the position and rotational speed of the crankshaft, not the camshaft. The PCM uses this information for engine timing and fuel injection.

Question 18

The main sensor that determines engine speed is the CMP.

Accepted Answer

The main sensor that determines engine speed is the Crankshaft Position Sensor (CKP), not the Camshaft Position Sensor (CMP).

Question 19

Technician A says crankshaft position sensors can be a magnetic pickup-style sensor. Technician B says crankshaft position sensors can be a Hall-effect sensor or an optical-style sensor. Who is correct?

Accepted Answer

Crankshaft position sensors can indeed be magnetic pickup-style sensors, Hall-effect sensors, or optical-style sensors, making both Technician A and Technician B correct.

Question 20

Technician A says that a CKP sensor sends a pulsed signal to the PCM to determine engine speed. Technician B says that the CKP speed signal is compared to the transmission input shaft speed sensor to determine torque converter slippage. Who is correct?

Accepted Answer

Technician A is correct because the CKP (Crankshaft Position) sensor does send a pulsed signal to the PCM (Powertrain Control Module) to determine engine speed. Technician B is also correct because the PCM can compare the CKP speed signal to the transmission input shaft speed sensor to determine torque converter slippage.

Quiz 11: Electronically Controlled Transmission