Exam 12: In-Vehicle Transmission Repairs

On electronically controlled transmissions, testing the transmission's hydraulic pressure may involve using a factory scan tool to actuate the Electronic Pressure Control (EPC) solenoid in order to check if the Powertrain Control Module (PCM) can vary the line pressure.

During the test-drive of a vehicle with a suspected automatic transmission concern, it is critical to place the transmission in the same operating conditions as the customer stated the problem occurred in.

Tech A says that commanding shift solenoids on and off, one at a time, is an example of focused testing. Tech B says that test driving the vehicle is an example of verifying the customer's concern. Who is correct?

Bidirectional control means the technician will be able to command different solenoids and actuators with a vehicle scan tool to check their operation.

Which of the following is a good first step in diagnosis of any transmission concern?

UV dye should never be used to locate the source of transmission leaks.

Technician A says that low line pressure can be caused by a plugged transmission vent. Technician B says that high line pressure is caused by a restricted filter. Who is correct?

Where are transmission in-vehicle diagnosis inspections and tests performed?

Technician A says that it is critical to have the proper safety equipment before working on a hybrid. Technician B says that hybrid vehicles use safety interlocks to prevent technician injury so it is not necessary to use protective gloves. Who is correct?

Which of the following is used when performing an in-vehicle diagnosis of a transmission?

Which of the following checks evaluates torque converter operation and also checks the transmission for slippage?

Transmission coolers can be cleaned by:

Scanning for computer codes and data will allow you to pinpoint the root cause of the transmission issue without further troubleshooting.

Technician A says whenever you are removing and installing a transmission, always wear safety glasses. Technician B says transmission fluid, rust, and dirt can drip down from a transmission and cause serious eye injury. Who is correct?

Tech A says that increasing the transmission fluid level from the add mark to the full mark typically requires a quart of fluid, just like with engine oil. Tech B says that when checking for automatic transmission fluid leaks, you should also remove the radiator cap and look for ATF in the radiator, Who is correct?

Technician A says to check the effect of throttle pressure on the boost valve, you do not need to disconnect the throttle cable or linkage. Technician B says to check the effect of throttle pressure on the boost valve, you need to connect a pressure gauge to the transmission line pressure test port. Who is correct?

Which of the following is NOT a method of testing an automatic transmission?

Which of the following is required when working on and around hybrid vehicles?

It is important to follow the strategy based diagnosis method as some transmission methods of testing may not need to be performed.

Tech A says that the fluid level in many automatic transmissions is checked with the engine idling and the transmission in park. Tech B says that some manufacturers don't provide a dipstick to check the automatic transmission fluid (ATF) level. Who is correct?