AUTO-2220: Automatic Transmission Diagnosis & Repair

Having access to what would allow the technician to test drive the vehicle in the repair shop?

Chassis dynamometer

When using a scan tool to monitor electronic components inside and outside of the transmission during a road test, which of the following precautions has to be taken?

Do not drive with a scan tool in front of an airbag.

As part of general transmission maintenance, all of the following should be done EXCEPT:

disassembling and checking the transmission.

The device that varies incoming line pressure using centrifugal force is known as:

governor.

Technician A says that VDP CVT's use a steel belt made up of hundreds of transversely mounted steel plates. Technician B says that some VDP CVT's are programmed to give the feel of shift points. Who is correct?

Both A and B

What factors are used to control line pressure so that appropriate force is used to apply and hold the clutches and bands?

Both A and B

To check the pump operation, what test should the technician conduct?

Hydraulic pressure test

Which gear needs higher line pressure, and the modulator/throttle valve pressure are not used?

Reverse.

When a customer describes a slipping transmission as a complaint, what test is the best way to verify?

Road test

Which of the following is the maximum speed in mph a technician should operate a vehicle on a hoist for testing purposes?

45 mph

Which of these is likely to be used in a modern variable pulley continuously variable transmission (CVT)?

Steel belt

Technician A says that BAS vehicles use an alternator to help slow the vehicle as well as act as a starter. Technician B says that the BAS alternator can be used to propel the vehicle independent of the ICE. Who is correct?

Technician A

Technician A says that a vacuum modulator converts manifold vacuum into an engine load signal. Technician B says that the manual valve is moved by governor pressure to force a shift. Who is correct?

Technician A

Technician A says that when checking the fluid level on the dipstick, always read the highest level on either side. Technician B says that when reinstalling the pan, start all of the bolts before tightening any of them. Who is correct?

Technician B

Technician A says to check the operation of the throttle valve boost, you do not need to disconnect the vacuum hose on a vacuum modulator and attach a vacuum pump to vary the line pressure. Technician B says to check the operation of the throttle valve boost, you need to connect a pressure gauge to the transmission line pressure test port. Who is correct?

Technician B

Which of these functions makes it so that the overall displacement of the ICE can be reduced?

Torque assist

What is helpful on small three- and four-cylinder engines with respect to compression and power impulses?

Torque smoothing

Which system uses the combination of two electric motor/ generators and an ICE driven through a specially designed planetary gear set(s), which creates an infinite number of gear ratios?

Toyota and Lexus hybrids

Which of the following is the most common type of continuously variable transmission (CVT) commonly used in production, non-hybrid vehicles?

Variable-diameter pulley CVT

The Honda ____________system can be used with a conventional automatic transmission, a manual transmission, or a continuously variable transmission (CVT).

integrated motor assist

When diagnosing problems in the transmission:

use accurate service information.

Torque smoothing:

use an electric motor to help smooth out the power pulses of the ICE.

Harsh-shifting transmission could be caused:

when the line pressure is too high during normal cruising speeds.

When performing an automatic transmission fluid and filter change what should a technician look for in the bottom of the transmission pan that indicates potential transmission problems?

Sparkly metal flakes and dark residue

Which test stresses the drivetrain so much that many manufacturers do not recommend performing it?

Stall test

Technician A says that line pressure is reduced during light throttle conditions to improve fuel economy. Technician B says that as the engine speeds up in rpm, the transmission line pressure gradually reduces to maintain clutch pack pressure. Who is correct?

Technician A

Technician A says that when governor pressure on one side of a shift valve overcomes spring pressure and throttle pressure on the other side, an upshift occurs. Technician B says when reverse boost pressure on one side of the reverse valve overcomes governor pressure on the other side, shift into reverse occurs. Who is correct?

Technician A

Technician A says that reciprocating force controls governor pressure. Technician B says that centrifugal force controls governor pressure. Who is correct?

Technician B

Which of the following can be used in a hybrid vehicle to generate electricity to charge the high-voltage battery?

The vehicle's kinetic energy during braking

The vacuum modulator converts the engine vacuum signal into:

modulator pressure.

Technician A says that in reverse, governor pressure regulates line pressure. Technician B says that in reverse, modulator pressure regulates line pressure. Who is correct?

Neither A nor B

Technician A says that low line pressure can be caused by a plugged transmission vent. Technician B says that high line pressure is caused by a restricted filter. Who is correct?

Neither A nor B

All of the following statements are true EXCEPT:

regenerative brakes can develop great amount of stopping power.

All of the following statements are true EXCEPT:

As the throttle opening increases, throttle valve pressure decreases.

The variable-diameter pulley CVT:

As the vehicle gains speed, the input pulley diameter increases while the output pulley diameter decreases.

Technician A says that commanding shift solenoids on and off, one at a time, is an example of focused testing. Technician B says that test driving the vehicle is an example of verifying the customer's concern. Who is correct?

Both A and B

Technician A says that hybrid vehicles have two power sources such as an internal combustion engine and an electric motor. Technician B says that most hybrid vehicles utilize regenerative braking to help improve fuel economy. Who is correct?

Both A and B

Technician A says that modifying governor weights will alter transmission shifting. Technician B says that excessive modification of the governor weights may cause the transmission to not shift. Who is correct?

Both A and B

Technician A says that the fluid level in many automatic transmissions is checked with the engine idling and the transmission in park. Technician B says that some manufacturers don't provide a dipstick to check the automatic transmission fluid (ATF) level. Who is correct?

Both A and B

Which function uses a small, electric transmission hydraulic pump that prevents a delay in the engagement of the transmission?

Idle start

Technician A says that governor pressure is controlled by torque converter rpm. Technician B says that governor pressure is controlled by output shaft speed. Who is correct?

Technician B

Technician A says that powertrain mounts hold the powertrain firmly in place and prevent the engine from moving at all. Technician B says that the life of rubber powertrain mounts is reduced by being saturated with oil from a leak. Who is correct?

Technician B

During idle-stop:

The engine stops while the vehicle is stopped.

When the manual valve is in park position, the line pressure:

is not able to flow past the valve to any other components of the transmission.

All of the following statements with respect to i-MMD are true EXCEPT:

it utilizes a four-speed gear box.

Technician A says that performing a stall test can reveal slippage within the torque converter or transmission. Technician B says that a stall test can damage some transmissions and should not be performed on all transmissions. Who is correct?

Both A and B

Technician A says that the throttle valve is controlled by a cable or linkage hooked to the engine throttle linkage. Technician B says that a misadjusted throttle valve cable can prevent wide-open throttle (WOT) on an engine. Who is correct?

Both A and B

Technician A says transmissions can prevent a downshift that would exceed the engine's maximum rpm. Technician B says reverse only uses one speed so line pressure is directly applied by the manual valve to the appropriate apply devices. Who is correct?

Both A and B

Two technicians are discussing the two-mode hybrid. Technician A says the system uses 300 volts to power the two electric motor/generators housed inside the transmission case. Technician B says the two-mode hybrid uses three or four planetary gear sets, depending on the application. Who is correct?

Both A and B

Which of the following best describes the appearance of clutch material in the bottom of an automatic transmission pan?

Dark residue

All of the following systems are considered as full hybrid that can be classified as a series-parallel hybrid EXCEPT:

Integrated motor assist (IMA).

If an automatic transmission only had a governor, and no throttle valve or vacuum modulator, what is the shift most likely to be like?

It would shift at the same point no matter what the engine load is.

Hydraulic-style power train mounts are _______ rubber mounts and may be available only through the manufacturer.

Much more expensive than

Technician A says that the converter and cooler operate at line pressure. Technician B says that line pressure causes the manual valve to move during upshifts and downshifts. Who is correct?

Neither A nor B

Technician A says that the transmission in a Toyota hybrid has a separate gear to provide reverse. Technician B says that Toyota hybrids use a VDP CVT transmission. Who is correct?

Neither A nor B

Which of the following has multiple lands designed to block or allow line pressure to pass to a band or clutch in order to apply the gear?

Shift valve

Which of the following governor designs uses two valves: a primary valve and a secondary valve?

Staged governor

Which of the following governor designs is most precise across a wide range of road speeds?

Staged governors

Technician A says on electronically controlled transmissions, the Torque Converter Clutch (TCC) solenoid is monitored by the Powertrain Control Module (PCM) and diagnostic trouble codes can be set when the TCC is not operating correctly. Technician B says on older hydraulically controlled transmissions, the PCM will set codes if the TCC solenoid is physically stuck closed. Who is correct?

Technician A

Technician A says that it is critical to have the proper safety equipment before working on a hybrid vehicle. Technician B says that hybrid vehicles use safety interlocks to prevent technician injury so it is no longer necessary to use protective gloves. Who is correct?

Technician A

Technician A says that on a vehicle with a VDP CVT, when the vehicle starts from a stop, the input pulley has a small diameter while the output pulley has large diameter. Technician B says that VDP CVT's typically use a separate electric motor for reverse. Who is correct?

Technician A

Technician A says that some CVT's require a heating system to warm the transmission fluid during cold weather operation. Technician B says that CVT's use conventional automatic transmission fluid. Who is correct?

Technician A

Technician A says that the Honda IMA system uses a thin electric motor in place of a conventional flywheel or flexplate. Technician B says that the Honda IMA system can operate on the electric motor only. Who is correct?

Technician A

Technician A says that two-mode hybrid vehicles uses two motor/generators along with an ICE to propel the vehicle. Technician B says that at low speeds, the two-mode hybrid vehicle can operate off one motor only. Who is correct?

Technician A

Technician A says that using a scan tool to momentarily activate the TCC, with the engine idling in drive and the brakes applied, is a typical troubleshooting task. Technician B says that diagnosis is a waste of time on a faulty transmission because it will be rebuilt anyway. Who is correct?

Technician A

Technician A says that when changing the fluid and filter, the presence of a small amount of clutch material in the pan is normal. Technician B says that if the pan gasket is leaking, you should tighten the pan bolts about a quarter turn at a time until the leak stops. Who is correct?

Technician A

Technician A says that hybrid vehicles do not need a transmission since they have two power sources. Technician B says that some hybrid transmissions have a small electric fluid pump for when the transmission is in idle/stop mode. Who is correct?

Technician B

Technician A says that increasing the transmission fluid level from the add mark to the full mark typically requires a quart of fluid, just like with engine oil. Technician B says that when checking for automatic transmission fluid leaks, you should also remove the radiator cap and look for ATF in the radiator, who is correct?

Technician B

Technician A says that line pressure in an automatic transmission is controlled by engine rpm. Technician B says that modulator pressure changes with engine vacuum. Who is correct?

Technician B

Technician A says that when checking line pressure, the engine should be off. Technician B says that low line pressure can be caused by a worn pump. Who is correct?

Technician B

All of the following are very critical while doing a test drive EXCEPT:

avoiding testing the transmission in different gear ranges.

All of the following can be replaced during in-vehicle transmission repairs EXCEPT:

sun gear.

In second gear with low governor pressure, the line pressure is allowed to flow from the 2-3 shift valve to:

the 2nd gear clutch or band.

When the governor pressure becomes great enough to overcome the spring pressure and the modulator/throttle valve pressure in the 2-3 shift valve, line pressure is allowed to flow to:

the 3rd gear clutch or band.