Exam 43: Automatic Transmission and Transaxle Service

Air pressure tests are performed during disassembly to locate leaking seals and during reassembly to check the operation of the clutches and servos.

Technician A says transmission fluid overheating can be caused by a defect in the engine cooling system. Technician B says transmission cooler leaks can be diagnosed by removing and plugging the radiator hose inlet and outlet, then pressurizing the radiator with 50 to 70 psi of shop air while checking for bubbles in the transmission fluid. Who is correct?

With the cooler return line disconnected, how much fluid should flow through the cooler during a 20-second test?

Most transmission shops rebuild the torque converter when overhauling the transmission.

A leaking transmission pump seal can be replaced without removing the transmission.

Some manufacturers do not recommend pressure testing automatic transmissions.

A faulty wiring connector will not affect shift timing.

Technician A says thumps and grinding noises are often caused by bad thrust washers. Technician B says that noise that is related to engine speed and occurs in all gear ranges, including park and neutral, is likely caused by a bad planetary gearset. Who is correct?

The shape of the transmission's ____________________ can sometimes be used to identify the model of the transmission.

During a stall test, the engine speed was 50 rpm below the minimum stall speed. What is the most likely problem?

A normal vacuum gauge reading while the engine is idling is steady at about _____.

Technician A says driveline vibration that changes with engine speed can be caused by an unbalanced torque converter. Technician B says driveline vibration that changes with road speed can be caused by a bad universal joint. Who is correct?

The gear range selector linkage must be adjusted properly to prevent fluid line pressure loss from the manual valve.

During a road test, the engine's speed flares up during acceleration in drive. What could be the problem?

On all automatic transmissions, the fluid level is always checked with the engine running and the transmission in park.

What tool is needed to adjust the bands?

What do varnish deposits on the dipstick indicate?

A low fluid level may be caused by a leak in all of the following EXCEPT:

Incorrect pressure readings may reveal a possible problem in which of the following hydraulic circuits?

What is the most probable cause of low fluid levels?