Chapter 42 study

Two technicians are discussing EPC solenoids. Technician A says the EPC solenoid is a pulse width modulated solenoid and receives a duty cycle from the transmission control module. Technician B says the EPC solenoid is an on/off solenoid that is turned on when the PCM sees the three to four up shift. Who is correct?

A only

_____________ converts analog AC signals into DC square waves.

A to D converter

The TCM is programmed to adjust its operating parameters in response to changes within the system such as component wear. As component wear and shift overlap times increase the TCM adjust line pressure to maintain proper shift timing calibrations. This system is called ______________.

Adaptive Learning

A computer controlled transmission that starts out in the wrong gear could be caused by?

All Answers

The ____________ is a voltage generating sensor that uses a Hall Effect or pm generator to produce a signal.

All answers

When a Lexus/Toyota hybrid vehicle is operating under heavy loads ___________.

All answers

Which of the following tools is not used check the throttle position sensor?

Ammeter

On the Toyota/Lexus hybrid transaxle the engine output is coupled to what component of the planetary gearset?

B

Which of the following statements concerning the operating characteristics of an EAT during limping mode is not true?

B

Technician A measures sensors only when they are cold. Technician B uses dielectric grease on electrical connections to prevent corrosion. Who is correct?

B only

Two technicians are discussing CVT transmissions. Technician A says that when a CVT equipped car is accelerating, the engine RPM remains constant as the mile per hour increases. Technician B says that some CVT vehicles do not have port converters, they use a multiple disc start clutch for idling and starting from a dead stop. Who is correct?

Both

Two technicians are discussing the operation of the Toyota Lexus hybrid. Technician A says that the vehicle is driven electrically by MG2 when the transmission selector is in reverse. Technician B says that whenever the car is powered by mg2 the engine may start if the battery state of charge is low. Who is correct?

Both

Two technicians are testing a transmission that has a DTC for a shift solenoid. The coil resistance is within specifications and the solenoid clicks on when the coil is energized with jumper wires. Technician A says the solenoid could be leaking internally or externally. Technician B says the valve within the solenoid could be sticking or binding. Who is correct?

Both

The MAP sensor is connected to the PCM the TCM gets manifold pressure information from the PCM through the ____________.

CAN Bus

The first step in diagnosing an EAT transmission problem is.

Connect scan tool and read DTC's

The crankshaft speed sensor reads 1650 rpm and the turbine speed sensor also reads 1650 RPM the torque converter is?

Coupled

The customer complains of shutter that occurs at light throttle just when the vehicle reaches 45 miles an hour. The shutter lasts for a few seconds and stops until the vehicle slows down and then speeds back up to 45 miles per hour. The problem could be _______________.

Defective TCC solenoid

Input split and compound split are two modes of operation in a _________________ type transmission.

Dual mode hybrid

Which of the following is not a TCM input signal?

Duty Cycle

Toyota, Ford and Nissan hybrid systems rely on _______ to determine the overall gear ratio their CVT's.

Electric motors

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

False

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

False

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

False

To test the solenoid with an ohm meter the transmission pan must be removed.

False

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

False

Hydraulically controlled transmissions rely on signals from the __________ and _____________ to force a shift in gears.

Governor, Throttle valve

If the TCM loses source voltage the transmission will enter into _____________ mode

Limp mode

When a Toyota/Lexus hybrid is driving on electric power if more torque is needed, _______________ is activated to start the engine.

MG1

The dual motor hybrid transmission contains all the following components except

Metal drive belt and multiple pulleys

Which of these is a component of a Toyota/Lexus transaxle?

Multiple disc clutch

When testing a solenoid with an ohm meter an infinite reading across a solenoid coil indicates that the coil is?

Open

Normally the shift solenoids receive voltage to the ignition switch are grounded through the _____________

PCM or TCM

Toyota/Lexus hybrid transaxle uses a ___________ that combines the power from the gas engine with the power from the electric motors.

Planetary Gearset

Air pressure can be used to test _________________

Pressure switches

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

Shift Schedule

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

Shift sooner than normal

A home made tester for checking the operation of the __________ can easily be made from an old wiring harness and a few simple switches.

Solenoids

A Magnetic pulse generator type sensor is commonly used to measure ____________ on an EAT transmission.

Speed

The Honda CVT transmission does not have a torque converter instead uses a _____________ to get the car moving without stalling or straining the engine.

Start clutch

The application of the torque converter clutch is controlled by the

TCC solenoid

The transmission fluid temperature sensor is a ____________ and its output signal varies with ATF temperature.

Thermistor

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

True

The EPC solenoid is duty cycle controlled by the TCM

True

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

True

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

True

Tuner? Cleaning spray is a good solvent used for cleaning electrical terminals and connectors.

True

Shift pressure control And torque converter clutch solenoids are usually located on the.......

Valve Body

The ________ sensor on an EAT replaces the governor used on a hydraulic controlled transmission.

Vehicle Speed Sensor or VSS

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

higher torque capacity

What type of sensor listed here is a potentiometer?

throttle position sensor