ASE A2 Automatic Transmission Practice Test

36. Technician A says a leaking transmission oil cooler causes pink milky transmission fluid. Technician B says heat and oxidation can cause pink milky transmission fluid. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

36.

Answer A is correct. Milky fluid is caused by contamination. Cross-fluid contamination occurs in the transmission cooler when ATF is mixed with engine coolant.

Answer B is wrong. Automatic transmission fluid is dyed translucent red for easy identification. Heat and time cause ATF breakdown and oxidation. This causes the transmission fluid to turn dark red, brown, or black colored.

Answer C is wrong. Technician A is correct.

Answer D is wrong. Technician A is correct.

37. Technician A says the EPC (electronic pressure control) system regulates line pressure according to engine speed and torque. Technician B says the EPC system may contain a variable force solenoid. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

37.

Answer A is wrong. The (EPC) or electronic pressure control solenoid regulates line pressure according to engine speed and torque.

Answer B is wrong. The EPC solenoid is considered a (VFS) or variable force solenoid.

Answer C is correct. Both technicians are correct.

Answer D is wrong. Both technicians are correct.

38. An automatic transaxle makes a low-pitched growling sound that increases with vehicle speed. Technician A says this could be caused by worn differential side bearings. Technician B says worn differential spider gears are the most likely cause of this noise. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

38.

Answer A is correct. Differential side bearings are rotating in all gears. They make a whining or rumbling sound that increases with vehicle speed.

Answer B is wrong. Damaged differential spider/pinion gears make noise while cornering.

Answer C is wrong. Manufacturers use shims or threaded adjusting nuts behind the bearings race to adjust side bearing preload. Proper preload keeps the case from wobbling inside the carrier and adjusts the backlash between the ring and pinion gear.

Answer D is wrong. Answer A is correct.

39. Technician A says the transmission control module uses the engine coolant temperature sensor's input for torque converter clutch control. Technician B says the throttle position sensor has replaced the hydraulic governor in electronic transmissions. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

39.

Answer A is correct. Transmission control modules use the ECT signal to delay TCC engagement until the engine reaches the required temperature.

Answer B is wrong. TCMs use information from both engine and transmission sensors. Many older mechanical components have been replaced with an electronic counterpart. The governor has been replaced with the VSS or vehicle speed sensor.

Answer C is wrong. Technician A is correct.

Answer D is wrong. Technician A is correct.

40. A vehicle with an electronic automatic transmission has problems with shift timing and is hunting for gears. A scan indicates several sensors and shift solenoids are faulty. Technician A says to replace the sensors and erase the fault codes. Technician B says to inspect the circuits leading to these components. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B

40.

Answer A is wrong. Inspect and test the sensor's circuit and wiring before replacing it.

Answer B is correct. With so many fault codes, it could be the controller or circuit, not faulty sensors or solenoids. Inspect and test the controller, wiring, plugs, and harness leading to the transmission case before replacing the parts.

Answer C is wrong. Technician B is correct.

Answer D is wrong. Technician B is correct.