ASE A2 Automatic Transmission Practice Test
1. A three-speed automatic transmission has a whining noise in first and second gear that goes away when it shifts into third. This condition is MOST likely caused by:
- A. A worn clutch.
- B. A worn band.
- C. The input shaft bearing.
- D. The planetary gear set.
Answer A is wrong. A slipping clutch results in slip while in gear and possible engine flare.
Answer B is wrong. As a band wears, a gap forms between the band and the drum. This gap will cause a transmission to slip.
Answer C is wrong. A worn input shaft bearing will make a constant noise in all gears.
Answer D is correct. The gear sets internal gears are not rotating but held stationary in direct drive. If a component like the pinion gears are not moving or rotating, then their not making the whining noise.
2. There are metal shavings at the bottom of a transmission's oil pan. Which of the following is causing this debris?
- A. This is normal.
- B. A worn band.
- C. A worn clutch.
- D. Chipped gear teeth.
Answer A is wrong. This is not a normal condition.
Answer B is wrong. As a band wears, a gap forms between the band and the drum. This gap will cause a transmission to slip. Black pieces in the pan indicate worn clutch or band friction material.
Answer C is wrong. Black pieces found in the bottom of the pan indicate worn clutch and band friction material.
Answer D is correct. It is normal to find fine particles, especially around the magnet. Metal flakes and shavings found in the bottom of the oil pan indicate chipped or worn gearset teeth.
3. A vehicle with an automatic transmission creeps forward in neutral. Which of the following is MOST likely causing this condition?
- A. The pressure regulator valve.
- B. The manual valve.
- C. A shift valve.
- D. The throttle valve.
Answer A is wrong. The pressure regulator valve controls mainline pressure. Mainline pressure is the source pressure for the torque converter, the valve body, and the clutches and bands in an automatic transmission.
Answer B is correct. The valve body contains the manual valve. A detent holds it in position, and it is connected to the shift lever by a cable. Movement of the shift lever moves the valve in it's bore. As the driver selects different gear selections, the manual valve directs fluid to different band and clutch circuits.
Answer C is wrong. Shift valves control the reactionary devices (clutches and bands) that drive and hold members of the planetary gearset.
Answer D is wrong. This is not normal. A worn or misadjusted manual valve can lead to pressure bleed between hydraulic circuits.
4. In drive, a vehicle with an automatic three-speed synchronous transmission slips when it shifts from first to second gear. Technician A says that synchronous transmissions rely on precise shift timing; inaccurate timing will result in slipping and engine flare. Technician B says that early application of the intermediate band is causing this condition. Who is correct?
- A. Technician A
- B. Technician B
- C. Both A and B
- D. Neither A or B
Answer A is correct. Synchronous transmissions rely on precise shift timing. Non-synchronous transmissions have overrunning clutches that lock and drive the output shaft in the first gear and the release and spin freely when the next gear engages and takes over.
Answer B is wrong. Early application of the intermediate band would result in a bind, not a slip.
Answer C is wrong. A non-synchronous automatic transmission uses a one-way driving clutch that overruns as the next gear engages.
Answer D is wrong. Technician A is correct.
5. A vehicle's automatic transmission is not downshifting correctly. A vacuum hose is detached and hanging down by the transmission pan. This vacuum hose should be connected to which of the following?
- A. The Governor.
- B. The Throttle Position Sensor.
- C. The Modulator.
- D. The Vehicle Speed Sensor.
Answer A is wrong. Governors are used in hydraulically controlled transmissions to indicate vehicle speed.
Answer B is wrong. A throttle position sensor is used in today's electronically controlled transmissions to indicate load. They replace the modulators used in older transmissions.
Answer C is correct. A modulator is a vacuum controlled device that controls throttle pressure.
Answer D is wrong. Vehicle speed sensors replace the governor in older hydraulic transmissions.