Exam 42: Electronic Automatic Transmissions

Toyota, Ford, and Nissan hybrid systems rely on ____________________ to determine the overall gear ratio of their CVTs.

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

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 adjusts line pressure to maintain proper shift timing calibrations. This is called ____________________.

Two technicians are testing a transmission that has a DTC for a shift solenoid. The coil resistance is within specifications and the solenoid clicks 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?

Which of the following is NOT a TCM input signal?

Name four input sensors that supply information to the TCM [transmission control module] through the network bus.

Two technicians are discussing the operation of the Toyota/Lexus hybrid transaxle. 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 SOC is low. Who is correct?

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

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

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

Describe what happens when the transmission goes into limp-in mode.

When testing a solenoid with an ohmmeter, an infinite reading across the solenoid coil indicates that ______.

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

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

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

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

Two technicians are discussing CVT transmissions. Technician A says that when a CVT-equipped car is accelerating, the engine RPM remains constant as the mph increases. Technician B says that some CVT vehicles do not have torque converters. They use a multiple disc starting clutch for idling and starting from a dead stop.

Air pressure can be used to test _____.

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

Name three input sensors that connect directly to the TCM. These sensors are generally mounted on or inside the transmission.