ASE A2 Automatic Transmission Practice Test
16. Technician A says the valve body separator plate contains the seat for ball-type check valves. Technician B says ball-type check valves are placed in valve body hydraulic circuits to allow fluid flow in only one direction. Who is correct?
- A. Technician A
- B. Technician B
- C. Both A and B
- D. Neither A or B
Answer A is wrong. The valve body consists of different types of valves. Check valves are placed in hydraulic circuits to prevent flow in one direction while allowing flow in the other.
Answer B is wrong. When assembled, the separator plate contains the seat for ball check valves; the size of the orifice determines its flow rate. Make sure the check balls return to their exact locations.
Answer C is correct. Check valves are placed in hydraulic circuits to allow flow in only one direction.
Answer D is wrong. Retrieve specifications; it's essential to use the correct torque and pattern when reinstalling a valve body to a transmission case. Most patterns start in the middle and spiral outwards.
17. A torque converter's stator:
- A. Should spin freely in both directions.
- B. Spins freely until the torque converter reaches its coupling phase.
- C. Is fastened to the impeller.
- D. Has a one-way clutch that allows the stator to spin freely in one direction but keeps it from rotating in the other.
Answer A is wrong. If the stator spins freely in both directions or if it's locked in both directions, it's bad and needs replacement.
Answer B is wrong. If the stator's one-way clutch spins freely at low speeds, there will be a loss of torque multiplication, resulting in poor low-speed performance.
Answer C is wrong. It is not fastened to the impeller.
Answer D is correct. A stator has a one-way clutch that allows it to spin freely in one direction but keeps it from rotating in the other.
18. Which of the following is at the center of the planetary gearset?
- A. The pinion gear.
- B. The ring gear.
- C. The spur gear.
- D. The sun gear.
Answer A is wrong. The pinion gear set has external teeth in mesh with both the sun and pinion gears. It consists of several pinion gears contained inside of a carrier called the planet carrier.
Answer B is wrong. The ring gear has internal teeth and remains in constant mesh with the pinion gears. This gear remains in constant mesh with the pinion gears at all times.
Answer C is wrong. A spur gear is a straight (not helical) gear used in older manual transmissions.
Answer D is correct. The sun gear is located at the center of the planetary gear set and remains in constant mesh with the pinion gears.
19. When removing a torque converter from an automatic transmission, the technician should:
- A. Measure the depth of the torque converter into the transmission's bell housing before removal.
- B. Inspect the torque converter's hub for discoloring, nicks, scratches, and burrs.
- C. Both A and B.
- D. Neither A or B.
Answer A is wrong. Measure the depth of the torque converter into the transmission's bell housing. Use this measurement to ensure that the converter is correctly aligned with the transmission oil pump when reinstalling. Use a straight edge and a tape measure, or a ruler.
Answer B is wrong. Small nicks, scratches, and burrs can be removed from the hub using fine crocus cloth.
Answer C is correct. Both answers are correct.
Answer D is wrong. Torque converters can also balloon from too much pressure resulting in a whining sound heard at the front of the transmission.
20. Which of the following sensors affect both the engine and the automatic transmission's performance?
- A. The Manifold Absolute Pressure Sensor.
- B. The Mass Air Flow Sensor.
- C. The Throttle Position Sensor.
- D. All of the above.
Answer A is wrong. The (MAP) manifold absolute pressure sensor senses engine load through pressure in the intake manifold. A faulty MAP sensor affects engine performance, but can also affect a transmission's shift timing.
Answer B is wrong. The MAF or Mass Air Flow sensor provides information about engine load to the ECM and the TCM.
Answer C is wrong. The TP sensor's output, shared by the ECM and the TCM, indicates the throttle plate's angle. If the throttle plate were to approach WOT (4.5 volts) suddenly, the transmission should downshift.
Answer D is correct. The transmission control module uses inputs from the ECT, MAF, MAP, VSS, TPI, and more.