ASE Practice Test #3

Question 1

You will conduct all of the tests listed below while conducting preliminary diagnostics on an electronically controlled automatic transmission, EXCEPT:

Accepted Answer

Flex plate check

Answer

Preliminary diagnostics for an electronically controlled automatic transmission typically focus on assessing the transmission's basic operational health and fluid condition. This includes checking fluid levels, performing a line pressure test to evaluate hydraulic integrity, and conducting a stall test to check torque converter and clutch engagement. A flex plate check, while important for the engine-to-transmission connection, is generally not part of routine preliminary transmission diagnostics and is usually performed if specific symptoms indicate an issue with that component.

Question 2

Which of the following diagnostic techniques, which doesn't require manufacturing electrical standards, is the best for figuring out whether you have a bad fuel injector?

Accepted Answer

Determine if all injectors have the same electrical resistance

Answer

Fuel injectors are electromagnetic solenoids, and their internal electrical resistance is a key indicator of their health. By measuring the electrical resistance across the terminals of each injector and comparing it to specifications or other injectors, a technician can quickly identify an open circuit, a short circuit, or significant internal wear. This method is effective for diagnosing electrical faults without needing to operate the engine or use specialized electrical standards.

Question 3

These claims about an air conditioning performance test are all accurate EXCEPT for:

Accepted Answer

To avoid evaporator odor, you want to operate the AC in RECIRC instead of FRESH

Answer

Operating the AC continuously in RECIRC mode can actually contribute to evaporator odor. This mode recirculates stale cabin air and moisture, creating a damp environment on the evaporator fins that promotes the growth of mold and mildew. To help prevent odors, it's often recommended to periodically use FRESH air mode, especially before shutting off the vehicle, to introduce drier outside air and help dry out the evaporator.

Question 4

Someone expresses concern about their car's harsh shifting. First gear is when it's most noticeable. The first speed-blocking ring, according to technician A, is the most likely culprit. Technician B decides that the clutch needs an adjustment. Who is accurate?

Accepted Answer

Technician B

Answer

Technician B is accurate. Harsh shifting, particularly noticeable in first gear of a manual transmission, is a common symptom of an improperly adjusted clutch. If the clutch does not fully disengage, it can cause grinding or difficulty in selecting gears. While a worn blocking ring can cause shifting issues, a clutch adjustment is a more fundamental and frequently overlooked cause of harsh shifting.

Question 5

What is the most likely reason if you hear a flapping noise towards the front of an engine?

Accepted Answer

Timing belt tension is too loose

Answer

A flapping noise originating from the front of the engine is often indicative of a loose timing belt. If the timing belt tensioner is faulty or the belt itself is stretched, it can lose proper tension, causing it to vibrate excessively and create a distinct flapping sound. This condition is critical as a loose timing belt can jump teeth, leading to severe engine damage.