ASE A2 Automatic Transmission Practice Test
21. A vibration occurs while driving a vehicle with an automatic transmission at normal speeds. This vibration does not occur during a stall test. Which of the following is causing this vibration.
- A. The torque converter.
- B. The driveshaft.
- C. Worn crankshaft main bearings.
- D. The EPC solenoid.
Answer A is wrong. An out of balance torque converter will cause a vibration during a stall test.
Answer B is correct. The vehicle's driveshaft is held stationary during a stall test.
Answer C is wrong. A worn main crankshaft bearing would make a rapping noise during acceleration.
Answer D is wrong. The Electronic Pressure Control (EPC) replaces the conventional non-electric throttle cable/modulator system to provide pressure changes in response to engine load. This would affect pressures but would not cause a vibration.
22. There is a whining noise coming from the front of the transmission that increases with engine speed. This noise is present in all gears including park and neutral. The MOST likely cause of this is the:
- A. Planetary gear set.
- B. Oil pump.
- C. Output shaft.
- D. Torque converter.
Answer A is wrong. The most likely answer is the transmission pump.
Answer B is correct. A worn transmission pump makes a whining noise that increases with engine speed in all gears, including park and neutral.
Answer C is wrong. A bad output shaft makes noise only when the transmission is in gear.
Answer D is wrong. The most likely cause is the transmission oil pump.
23. An automatic transmission slips only when cold. As the vehicle warms to operating temperature, the transmission's performance returns to normal. Which of these is causing this condition?
- A. The oil pump.
- B. Hardened seals.
- C. The torque converter.
- D. Input shaft end-play.
Answer A is wrong. The pump will usually make a whining or whirling noise.
Answer B is correct. Hardened seals allow fluid past when cold, but as the vehicle warms the seals begin to function again. This transmission will need an overhaul to fix this problem.
Answer C is wrong. Perform a stall test to check the torque converter's performance. Always check to see if it is recommended by the vehicle manufacturer before proceeding.
Answer D is wrong. Input shaft end play would not cause this condition.
24. Technician A says to clean the valve body with solvent and a lint free cloth. Technician B says if a spool valve is bent it can be straightened and reused. Who is correct?
- A. Technician A
- B. Technician B
- C. Both A and B
- D. Neither A or B
Answer A is correct. The part should be cleaned in solvent and then air dried and wiped only with a lint free cloth or towel.
Answer B is wrong. A bent spool valve can not be repaired and must be replaced.
Answer C is wrong. Technician A is correct.
Answer D is wrong. Technician A is correct, always use lint free cloth on a valve body.
25. During a transmission fluid check the technician notices the ATF is milky in appearance. The is caused by which of the following?
- A. Overheating
- B. A slipping band.
- C. Oxidation
- D. An oil cooler leak.
Answer A is wrong. Overheating transmission fluid reduces its effectiveness dramatically.
Answer B is wrong. Slipping bands and clutches overheat the fluid causing it to turn brown colored.
Answer C is wrong. Oxidation turns the fluid a brown color.
Answer D is correct. Transmission fluid mixes with coolant in the radiator well producing a milky color similar to a strawberry milkshake.