Question 1

Tech A states that PCS solenoids should be cycled in clean automatic transmission fluid. Tech B states that there are pressure testing fixtures available for some transmissions. Who is correct?

Accepted Answer

The answer of Tech A states that PCS solenoids should...

Question 2

When measuring resistance across a normally closed pressure switch, the reading should go:

Accepted Answer

A normally closed pressure switch should show a low resistance (close to zero) when closed, and when it opens, the resistance should go to infinity, indicating an open circuit.

Question 3

Tech A sates that the pressure switches in a transmission should be tested with an ohmmeter. Tech B states that all pressure switches should be replaced during an overhaul. Who is correct?

Accepted Answer

Tech A is correct because pressure switches can be tested with an ohmmeter to check for continuity and proper function. Tech B is incorrect because not all pressure switches necessarily need to be replaced during an overhaul unless they are faulty.

Question 4

Tech A states that many shops will simply install a remanufactured valve body in every transmission they rebuild. Tech B states that the valve body will often require the majority of the service during the overhaul. Who is correct?

Accepted Answer

Both Tech A and Tech B are correct. Many shops do install remanufactured valve bodies during transmission rebuilds, and the valve body often requires significant service during an overhaul.

Question 5

Identify the component shown in the given figure.

Accepted Answer

The answer of Identify the component shown in the given...

Question 6

Identify the component shown in the given figure.

Accepted Answer

The answer of Identify the component shown in the given...

Question 7

________ is a coating that allows the valve to move more easily and helps prevent wear.

Accepted Answer

The answer of ________ is a coating that allows the...

Question 8

Tech A states that most aluminum valves can be anodized. Tech B states that only steel valves are anodized. Who is correct?

Accepted Answer

Anodizing is a process that is commonly used on aluminum to increase corrosion resistance and surface hardness. Steel is not typically anodized.

Question 9

Tech A states that valve bodies made of cast iron experienced little wear. Tech B states that valve bodies made of cast iron failed frequently. Who is correct?

Accepted Answer

Valve bodies made of cast iron are known for their durability and resistance to wear, supporting Tech A's statement.

Question 10

Tech A states that on modern transmissions, some of the valves are operated by pulse-width-modulated solenoids. Tech B states that pulse width modulation causes excessive wear in the soft aluminum of the valve body. Who is correct?

Accepted Answer

The answer of Tech A states that on modern transmissions,...

Question 11

Tech A states that valve bodies can be replaced with remanufactured units. Tech B states that valve bodies can be rebuilt in the shop using some specialized equipment. Who is correct?

Accepted Answer

Both Tech A and Tech B are correct. Valve bodies can be replaced with remanufactured units, and they can also be rebuilt in the shop using specialized equipment.

Question 12

Tech A states that it is sometimes not worth rebuilding a valve body if it is too worn. Tech B states all valve bodies can be rebuilt. Who is correct?

Accepted Answer

Tech A is correct because if a valve body is too worn, it may not be cost-effective or feasible to rebuild it, and replacement might be a better option.

Question 13

Identify the device shown in the given figure.

Accepted Answer

The answer of Identify the device shown in the given...

Question 14

Tech A states valve bores cannot be measured. Tech B states that valve bores can be measured, but it is very difficult to do so accurately. Who is correct?

Accepted Answer

Valve bores can indeed be measured, but it requires precision and the right tools, making it a challenging task to perform accurately.

Question 15

Tech A states that a soft rubber mat placed below the valve body will lead to inaccurate readings. Tech B states that a soft rubber mat placed below the valve body will help prevent the vacuum from leaking out. Who is correct?

Accepted Answer

A soft rubber mat placed below the valve body will help prevent the vacuum from leaking out.

Question 16

A vacuum tester is used to test the valve body of an engine. Tech A states that the valve body should be placed down onto the mat with the transmission case side of the valve body facing up. Tech B states that the transmission case side of the valve body should face down. Who is correct?

Accepted Answer

Tech A is correct because the valve body should be placed with the transmission case side facing up to properly test it with a vacuum tester.

Question 17

Tech A states that the same vacuum pump used for air conditioning service can be used for testing a valve body. Tech B states that a different vacuum pump should be used for testing a valve body. Who is correct?

Accepted Answer

A different vacuum pump should be used for testing a valve body to ensure that it is clean and free from contaminants that could affect the test results.

Question 18

The vacuum pump used for air conditioning service is used to test the valve body using a vacuum tester. Tech A states that the pump can become contaminated with the transmission fluid. Tech B states that addition of transmission fluid in the pump does not damage the pump. Who is correct?

Accepted Answer

The vacuum pump can become contaminated with transmission fluid if it is used improperly, which can lead to damage or reduced efficiency.

Question 19

Tech A states that the vacuum testing fixture does not need calibration. Tech B states that the vacuum testing fixture needs to be calibrated before testing the valve body. Who is correct?

Accepted Answer

Vacuum testing fixtures typically need calibration to ensure accurate and reliable test results, especially before testing components like a valve body.

Question 20

When calibrating the vacuum testing fixture, the valve on the pump inlet port should be adjusted so that the gauge indicates ________ of mercury.

Accepted Answer

The vacuum testing fixture should be calibrated to a specific vacuum level, often 5 inches of mercury, to ensure accurate testing conditions.

Quiz 17: Valve Body and Electric Service

Tech A states that PCS solenoids should be cycled in clean automatic transmission fluid. Tech B states that there are pressure testing fixtures available for some transmissions. Who is correct?

When measuring resistance across a normally closed pressure switch, the reading should go:

Tech A sates that the pressure switches in a transmission should be tested with an ohmmeter. Tech B states that all pressure switches should be replaced during an overhaul. Who is correct?

Tech A states that many shops will simply install a remanufactured valve body in every transmission they rebuild. Tech B states that the valve body will often require the majority of the service during the overhaul. Who is correct?

Identify the component shown in the given figure.

Identify the component shown in the given figure.

________ is a coating that allows the valve to move more easily and helps prevent wear.

Tech A states that most aluminum valves can be anodized. Tech B states that only steel valves are anodized. Who is correct?

Tech A states that valve bodies made of cast iron experienced little wear. Tech B states that valve bodies made of cast iron failed frequently. Who is correct?

Tech A states that on modern transmissions, some of the valves are operated by pulse-width-modulated solenoids. Tech B states that pulse width modulation causes excessive wear in the soft aluminum of the valve body. Who is correct?

Tech A states that valve bodies can be replaced with remanufactured units. Tech B states that valve bodies can be rebuilt in the shop using some specialized equipment. Who is correct?

Tech A states that it is sometimes not worth rebuilding a valve body if it is too worn. Tech B states all valve bodies can be rebuilt. Who is correct?

Identify the device shown in the given figure.

Tech A states valve bores cannot be measured. Tech B states that valve bores can be measured, but it is very difficult to do so accurately. Who is correct?

Tech A states that a soft rubber mat placed below the valve body will lead to inaccurate readings. Tech B states that a soft rubber mat placed below the valve body will help prevent the vacuum from leaking out. Who is correct?

A vacuum tester is used to test the valve body of an engine. Tech A states that the valve body should be placed down onto the mat with the transmission case side of the valve body facing up. Tech B states that the transmission case side of the valve body should face down. Who is correct?

Tech A states that the same vacuum pump used for air conditioning service can be used for testing a valve body. Tech B states that a different vacuum pump should be used for testing a valve body. Who is correct?

The vacuum pump used for air conditioning service is used to test the valve body using a vacuum tester. Tech A states that the pump can become contaminated with the transmission fluid. Tech B states that addition of transmission fluid in the pump does not damage the pump. Who is correct?

Tech A states that the vacuum testing fixture does not need calibration. Tech B states that the vacuum testing fixture needs to be calibrated before testing the valve body. Who is correct?

When calibrating the vacuum testing fixture, the valve on the pump inlet port should be adjusted so that the gauge indicates ________ of mercury.