Question 1

In a vehicle with a dual mode transmission, during normal driving under light loads, the vehicle is driven solely by the engine.

Accepted Answer

During normal driving under light loads, a vehicle with a dual mode transmission is driven solely by the engine. The electric motor only engages to assist the engine during acceleration or when extra power is needed.

Question 2

To test a solenoid with an ohmmeter, the transmission pan must be removed.

Accepted Answer

Testing a solenoid with an ohmmeter does not require the transmission pan to be removed. The ohmmeter can be used to measure the resistance of the solenoid coils at the electrical connector.

Question 3

The _____ is a voltage generating sensor that uses a Hall effect or PM generator to produce a signal.

Accepted Answer

All the sensors mentioned (VSS, OSS, TSS) can use the Hall effect or a PM generator to produce a signal, making all answers correct.

Question 4

On the Toyota/Lexus automatic transmissions with manual control, drivers must exercise caution when manually shifting to prevent engine or transmission failure.

Accepted Answer

The answer of On the Toyota/Lexus automatic transmissions with manual...

Question 5

The EPC (electronic pressure control) solenoid is duty-cycle-controlled by the TCM.

Accepted Answer

The EPC solenoid is a duty-cycle-controlled solenoid that is controlled by the TCM (transmission control module) in automatic transmissions.

Question 6

The Toyota/Lexus hybrid is driven by MG1 when running solely on electric power.

Accepted Answer

In a Toyota/Lexus hybrid system, MG2 (Motor Generator 2) is primarily responsible for driving the wheels when the vehicle is operating in electric-only mode, not MG1. MG1 mainly functions to start the engine and generate electricity.

Question 7

Which of the following is NOT an advantage of an electronically controlled transmission?

Accepted Answer

Higher torque capacity is actually an advantage of electronically controlled transmissions, as the computer can better manage the transmission of power to the wheels. B, C, and D are all advantages of electronically controlled transmissions.

Question 8

Shift, pressure control, and T/C clutch solenoids are usually located on the ______.

Accepted Answer

The valve body is typically the location where shift, pressure control, and T/C clutch solenoids are located.

Question 9

Which of the following statements concerning the operating characteristics of an EAT during limp-in mode is NOT true?

Accepted Answer

In limp-in mode, the transmission typically does not lock in fourth gear; it usually defaults to a lower gear like second or third to protect the transmission and allow the vehicle to be driven to a repair facility.

Question 10

A _____ contains the actual shift points to be used by the computer according to the input data it receives from the sensors.

Accepted Answer

A shift schedule contains the specific shift points that the computer should use based on the input it receives from sensors. The solenoid driver controls the transmission solenoids, the turbine speed sensor measures the speed of the transmission turbine, and a logic controller is a general term for any computer system that uses logical operations to control a process or system.

Question 11

If the crankshaft speed sensor reads 1,650 rpm and the TSS (turbine speed sensor) also reads 1,650 RPM, the torque converter is ______.

Accepted Answer

If both sensors are reading the same speed, it indicates that the torque converter is fully coupled, meaning that it is not slipping or in a stall condition. This is the desired operating condition for the torque converter. Therefore, option D is the best choice.

Question 12

The EPC solenoid provides changes in pressure in response to engine load.

Accepted Answer

The EPC (Electronic Pressure Control) solenoid is responsible for controlling the hydraulic pressure in the transmission. It responds to engine load by adjusting the pressure accordingly, which helps to ensure smooth shifting and optimal performance.

Question 13

Two technicians are discussing EPC solenoids. Technician A says the EPC solenoid is a PWW (pulse width modulated) solenoid and receives a duty cycle signal from the TCM. Technician B says the EPC solenoid is an on/off solenoid that is turned on when the TCM sees the 3-4 upshift. Who is correct?

Accepted Answer

The EPC (Electronic Pressure Control) solenoid is a pulse width modulated (PWM) solenoid that receives a duty cycle signal from the Transmission Control Module (TCM) to control hydraulic pressure in the transmission. Technician B's description of an on/off solenoid is incorrect for an EPC solenoid.

Question 14

TV-tuner cleaning spray is a good solvent to use for cleaning electrical terminals and connectors.

Accepted Answer

The answer of TV-tuner cleaning spray is a good solvent...

Question 15

Which of the following is NOT a TCM input signal?

Accepted Answer

All of the other options (TP, ECT, and MAP) are commonly used TCM input signals, while TCC-DC is not typically used as an input signal for the transmission control module.

Question 16

Transmission solenoids shift gears by mechanically coupling gears to the output shaft.

Accepted Answer

Transmission solenoids use electronically controlled valves to direct hydraulic fluid to shift gears, rather than mechanically coupling gears to the output shaft.

Question 17

When transmission fluid temperature is too high, the TCM will cause the transmission to ______.

Accepted Answer

The answer of When transmission fluid temperature is too high,...

Question 18

PCM input data such as MAP, TP, and engine speed cannot be transferred to the TCM through the vehicle CAN bus.

Accepted Answer

PCM input data such as MAP (Manifold Absolute Pressure), TP (Throttle Position), and engine speed can indeed be transferred to the TCM (Transmission Control Module) through the vehicle's CAN (Controller Area Network) bus, allowing for integrated control and communication between different vehicle systems.

Question 19

A DTC for an input signal that is too low or too high can be caused by an internal transmission mechanical or hydraulic failure.

Accepted Answer

A low or high input signal can be caused by internal mechanical or hydraulic failures within the transmission system.

Question 20

The TFT sensor is a _____ and its output signal varies with ATF temperature.

Accepted Answer

The TFT (Transmission Fluid Temperature) sensor is a thermistor which changes its resistance with a change in temperature. The output signal from the thermistor is used to measure the temperature of the ATF (automatic transmission fluid).

Quiz 42: Electronic Automatic Transmissions