ASE Automatic Transmission/Transaxle 3 — Questions and Answers
Question 1: A stall test that produces RPM well above specification indicates which problem?
- Engine performance fault
- Clutch or band slippage (Correct answer)
- Locked torque converter stator
- Restricted exhaust
Correct answer: Clutch or band slippage
Higher-than-spec stall RPM means the apply components are slipping and not transmitting full torque.
Question 2: A stall test RPM that is far below specification most likely points to which condition?
- Slipping forward clutch
- Engine not producing full power (Correct answer)
- Worn governor
- Low line pressure
Correct answer: Engine not producing full power
Below-spec stall RPM usually means the engine cannot reach full torque output, not a transmission fault.
Question 3: What is the primary purpose of the torque converter stator?
- Engage the lockup clutch
- Multiply torque at low speed (Correct answer)
- Drive the oil pump
- Sense fluid temperature
Correct answer: Multiply torque at low speed
The stator redirects fluid back to the impeller, multiplying torque during acceleration.
Question 4: Delayed engagement when shifting from Park to Drive after the car sits overnight most likely indicates what?
- Worn TPS
- Leaking pump or valve body allowing fluid drainback (Correct answer)
- Faulty speed sensor
- Broken band
Correct answer: Leaking pump or valve body allowing fluid drainback
Internal leakage drains pressure overnight, so it takes time to refill and engage when started.
Question 5: Which device on older transmissions senses vehicle speed hydraulically to help control upshifts?
- Governor (Correct answer)
- Modulator
- Servo
- Accumulator
Correct answer: Governor
The hydraulic governor develops pressure proportional to output shaft speed to signal upshifts.
Question 6: A vacuum modulator with a ruptured diaphragm will most likely cause which symptom?
- No reverse
- Transmission drawing fluid into the intake / smoking exhaust (Correct answer)
- Harsh park engagement
- No forward gears
Correct answer: Transmission drawing fluid into the intake / smoking exhaust
A torn modulator diaphragm lets engine vacuum pull ATF into the intake manifold, causing smoke.
Question 7: What is the function of an accumulator in an automatic transmission?
- Increase line pressure
- Cushion clutch and band apply for smooth shifts (Correct answer)
- Cool the fluid
- Lock the converter
Correct answer: Cushion clutch and band apply for smooth shifts
The accumulator absorbs a portion of apply pressure to soften the shift feel.
ASE Automatic Transmission/Transaxle 3
A stall test that produces RPM well above specification indicates which problem?