Question 1

​Technician A says a multimeter is a meter that combines the functions of a voltmeter, an ammeter, and an ohmmeter. Technician B says impedance is best defined as the operating resistance of an electrical device. Who is correct?

Accepted Answer

Technician A is correct because a multimeter indeed combines the functions of a voltmeter, an ammeter, and an ohmmeter, allowing it to measure voltage, current, and resistance, respectively. Technician B is also correct because impedance is a term used to describe the total opposition (including resistance and reactance) that a circuit presents to the flow of alternating current and can be considered the "operating resistance" of an electrical device in a broader sense.

Question 2

​Technician A says the fluid pressure switches used in today's transmissions either complete or open an electrical circuit to the computer. Technician B says that a fluid pressure switch can also be checked with air. Who is correct?

Accepted Answer

Technician A is correct in saying that modern fluid pressure switches can either complete or open an electrical circuit to the computer. Technician B is also correct in saying that a fluid pressure switch can be checked with air. In fact, one common method of testing a fluid pressure switch is to apply air pressure to the switch and observe whether it opens or closes the internal contacts. Therefore, both technicians are correct.

Question 3

While discussing magnetic pulse generators:  Technician A says magnetic pulse generators can be tested with a lab scope.  Technician B says the expected pattern is a DC signal.  Who is correct?

Accepted Answer

Magnetic pulse generators can be tested with a lab scope, which is what Technician A stated. However, the expected pattern for a magnetic pulse generator would not be a DC signal, which Technician B stated.

Question 4

​Technician A says the default gear is the normal gear selection. Technician B says the default gear is normally the gear selected by the TCM when the solenoids are off. Who is correct?

Accepted Answer

Technician B is correct. The default gear is the gear selected by the TCM when the solenoids are off. This is typically the third or fourth gear in automatic transmissions. Technician A's statement is incorrect as the default gear is not necessarily the normal gear selection, as it depends on the specific vehicle and transmission.

Question 5

Which is the name of the rules or operating parameters that allow for the exchange of information between on-board computers?

Accepted Answer

The name of the rules or operating parameters that allow for the exchange of information between on-board computers is protocols of communication. Serial communication and multiplexing are different methods or technologies that can be used to implement these protocols. Therefore, option B is the best choice. Option D is incorrect because it includes all the options, including serial communication and multiplexing, which are not the names of the protocols of communication but methods used to implement it.

Question 6

Technician A says an amplifying transistor is commonly referred to as a diode. Technician B says an IC is an incomplete circuit. Who is correct?

Accepted Answer

Neither technician A nor B is correct. An amplifying transistor is not commonly referred to as a diode, and an IC (integrated circuit) is a complete circuit, not an incomplete one.

Question 7

Technician A says the duty cycle of a solenoid is the length of time the solenoid is off during a cycle. Technician B says a PCS works with a VFS to control duty cycles of solenoids. Who is correct?

Accepted Answer

The answer of Technician A says the duty cycle of...

Question 8

Technician A says a normally vented solenoid allows fluid pressure to reach the shift valve until it is energized. Technician B says a normally applied solenoid does not allow fluid pressure to the shift valve until it is energized. Who is correct?

Accepted Answer

The answer of Technician A says a normally vented solenoid...

Question 9

Technician A says some manufacturers monitor clutch volume indexes. Technician B says this is part of an adaptive strategy. Who is correct?

Accepted Answer

Both technicians are correct. Some manufacturers do monitor clutch volume indexes as part of an adaptive strategy. The clutch volume indexes help the transmission control module (TCM) determine the correct amount of fluid pressure needed to engage the clutch efficiently. This information is used to improve shift quality and prolong the life of the transmission.

Question 10

Technician A says a DMM and a scan tool are two very important tools needed in diagnosing a computer controlled transmission. Technician B says circuits in a computer controlled transmission can be diagnosed using a simple test light. Who is correct?

Accepted Answer

Technician A is correct that a DMM (Digital Multimeter) and a scan tool are important tools needed to diagnose a computer-controlled transmission. These tools provide accurate readings and can help identify specific faults or codes stored in the transmission's control module.

Technician B is incorrect because a simple test light cannot provide the same level of accuracy as a DMM or scan tool when diagnosing circuits in a computer-controlled transmission. Using a test light alone can lead to misdiagnosis and may even cause further damage to the transmission's control module.

Question 11

Technician A says the PCI data bus system is a single wire multiplex system. Technician B says the CAN data system is a twisted-wire multiplex system. Who is correct?

Accepted Answer

Both statements are correct. The PCI (Peripheral Component Interconnect) data bus system indeed uses a single wire for its multiplex system, allowing multiple signals to share the same communication line, which is characteristic of a multiplex system. On the other hand, the CAN (Controller Area Network) data system utilizes a twisted-pair wire design for its multiplex system, which helps in reducing electromagnetic interference, making both statements accurate.

Question 12

Technician A says the flywheel/alternator/starter assembly may be positioned between the engine and the transmission and it does not require the very high voltage of the IMA. Technician B says the flywheel/alternator/starter assembly assists the engine when additional power is needed. Who is correct?

Accepted Answer

The answer of Technician A says the flywheel/alternator/starter assembly may...

Question 13

Technician A says when extra power is needed, Honda's IMA uses a 144-volt synchronous AC motor to assist the gasoline engine. Technician B says the electric motor in Honda's IMA is located where the torque converter would normally be found. Who is correct?

Accepted Answer

Both technicians are correct. Honda's Integrated Motor Assist (IMA) system uses a 144-volt synchronous AC motor to assist the gasoline engine when extra power is needed. The electric motor is located where the torque converter would normally be found in a conventional automatic transmission.

Question 14

​Technician A says high current is caused by high resistance. Technician B says a short to ground can occur internally within a component. Who is correct?

Accepted Answer

Technician B is correct. A short to ground can occur internally within a component, causing high current to flow. Technician A is incorrect because high current is caused by low resistance, not high resistance.

Question 15

Technician A says the diode check function of an ohmmeter is used to test semiconductors. Technician B says voltmeters are used to test semiconductors. Who is correct?

Accepted Answer

Technician A is correct. The diode check function of an ohmmeter can be used to test the forward and reverse bias of a semiconductor diode. Technician B is incorrect because voltmeters are not specifically designed to test semiconductors and would not provide accurate and detailed information about their behavior.

Question 16

Technician A says that by monitoring the MAP values, the TCM can change the shift schedule of the vehicle. Technician B says the TP sensor voltage signal is sent to the PCM as an indication of engine temperature. Who is correct?

Accepted Answer

Technician A is correct. The TCM (Transmission Control Module) uses the MAP (Manifold Absolute Pressure) sensor values to determine the engine load and change the shift schedule accordingly.

Technician B is incorrect. The TP (Throttle Position) sensor voltage signal is not an indication of engine temperature, but rather an indication of the position of the throttle valve. The PCM (Powertrain Control Module) uses this signal to adjust the fuel delivery and ignition timing accordingly.

Question 17

​While testing temperature sensors: Technician A says typically the PCM supplies a reference voltage of 5 volts to the sensor.
Technician B says if the sensor is at its highest value on the scan tool, the sensor or its circuit is shorted.
Who is correct?

Accepted Answer

Technician A is correct because the Powertrain Control Module (PCM) commonly supplies a 5-volt reference to various sensors, including temperature sensors, for them to function properly. Technician B is also correct because if a sensor displays its highest possible value on a scan tool, it often indicates that the sensor or its circuit is shorted to ground, causing it to read at the extreme end of its range.

Question 18

Technician A says the waveform created by AC voltage is typically called a sine wave. Technician B says one complete sine wave is a cycle. Who is correct?​

Accepted Answer

Both technicians are correct. A sine wave is the most common waveform produced by AC voltage, and one complete waveform is referred to as a cycle.

Question 19

Technician A says a VSS is a sensor that transmits high voltage pulses. Technician B says a VSS measures electronic wear in the TCM. Who is correct?

Accepted Answer

Neither A nor B. A VSS (Vehicle Speed Sensor) is a sensor that measures the speed of the vehicle and sends that information to the engine control module (ECM) or transmission control module (TCM). It does not transmit high voltage pulses nor does it measure electronic wear in the TCM.

Question 20

​While discussing a lab scope waveform: Technician A says the horizontal movement of the waveform represents voltage. Technician B says the horizontal voltage scale must be adjusted in relation to the expected voltage signal. Who is correct?

Accepted Answer

The horizontal movement of a waveform on a lab scope actually represents time, not voltage. The vertical movement represents voltage. Therefore, Technician A's statement is incorrect. Technician B's statement is also incorrect as it confuses the concepts; it's the vertical scale that is adjusted for voltage, not the horizontal scale. The horizontal scale is adjusted to view the waveform over a specific time period.

Quiz 4: Transmission Electronics

​Technician A says a multimeter is a meter that combines the functions of a voltmeter, an ammeter, and an ohmmeter. Technician B says impedance is best defined as the operating resistance of an electrical device. Who is correct?

​Technician A says the fluid pressure switches used in today's transmissions either complete or open an electrical circuit to the computer. Technician B says that a fluid pressure switch can also be checked with air. Who is correct?

While discussing magnetic pulse generators: Technician A says magnetic pulse generators can be tested with a lab scope. Technician B says the expected pattern is a DC signal. Who is correct?

​Technician A says the default gear is the normal gear selection. Technician B says the default gear is normally the gear selected by the TCM when the solenoids are off. Who is correct?

Which is the name of the rules or operating parameters that allow for the exchange of information between on-board computers?

Technician A says an amplifying transistor is commonly referred to as a diode. Technician B says an IC is an incomplete circuit. Who is correct?

Technician A says the duty cycle of a solenoid is the length of time the solenoid is off during a cycle. Technician B says a PCS works with a VFS to control duty cycles of solenoids. Who is correct?

Technician A says a normally vented solenoid allows fluid pressure to reach the shift valve until it is energized. Technician B says a normally applied solenoid does not allow fluid pressure to the shift valve until it is energized. Who is correct?

Technician A says some manufacturers monitor clutch volume indexes. Technician B says this is part of an adaptive strategy. Who is correct?

Technician A says a DMM and a scan tool are two very important tools needed in diagnosing a computer controlled transmission. Technician B says circuits in a computer controlled transmission can be diagnosed using a simple test light. Who is correct?

Technician A says the PCI data bus system is a single wire multiplex system. Technician B says the CAN data system is a twisted-wire multiplex system. Who is correct?

Technician A says when extra power is needed, Honda's IMA uses a 144-volt synchronous AC motor to assist the gasoline engine. Technician B says the electric motor in Honda's IMA is located where the torque converter would normally be found. Who is correct?

​Technician A says high current is caused by high resistance. Technician B says a short to ground can occur internally within a component. Who is correct?

Technician A says the diode check function of an ohmmeter is used to test semiconductors. Technician B says voltmeters are used to test semiconductors. Who is correct?

Technician A says that by monitoring the MAP values, the TCM can change the shift schedule of the vehicle. Technician B says the TP sensor voltage signal is sent to the PCM as an indication of engine temperature. Who is correct?

​While testing temperature sensors: Technician A says typically the PCM supplies a reference voltage of 5 volts to the sensor. Technician B says if the sensor is at its highest value on the scan tool, the sensor or its circuit is shorted. Who is correct?

Technician A says the waveform created by AC voltage is typically called a sine wave. Technician B says one complete sine wave is a cycle. Who is correct?​

Technician A says a VSS is a sensor that transmits high voltage pulses. Technician B says a VSS measures electronic wear in the TCM. Who is correct?

​While discussing a lab scope waveform: Technician A says the horizontal movement of the waveform represents voltage. Technician B says the horizontal voltage scale must be adjusted in relation to the expected voltage signal. Who is correct?

Technician A says a multimeter is a meter that combines the functions of a voltmeter, an ammeter, and an ohmmeter. Technician B says impedance is best defined as the operating resistance of an electrical device. Who is correct?

Technician A says the fluid pressure switches used in today's transmissions either complete or open an electrical circuit to the computer. Technician B says that a fluid pressure switch can also be checked with air. Who is correct?

Technician A says the default gear is the normal gear selection. Technician B says the default gear is normally the gear selected by the TCM when the solenoids are off. Who is correct?

Technician A says high current is caused by high resistance. Technician B says a short to ground can occur internally within a component. Who is correct?

While testing temperature sensors: Technician A says typically the PCM supplies a reference voltage of 5 volts to the sensor. Technician B says if the sensor is at its highest value on the scan tool, the sensor or its circuit is shorted. Who is correct?

Technician A says the waveform created by AC voltage is typically called a sine wave. Technician B says one complete sine wave is a cycle. Who is correct?

While discussing a lab scope waveform: Technician A says the horizontal movement of the waveform represents voltage. Technician B says the horizontal voltage scale must be adjusted in relation to the expected voltage signal. Who is correct?