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Diagnose Automatic Transmission Problems Part 1


What you can do to diagnose an automatic transmission problem.
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» Engine/Transmission Relation
» Transmission or Transaxle?
» Transmission Testing
» Transmission Leak Tests
» Diagnosis By Symptom
 

Engine/Transmission Relations

An important part of transmission diagnosis is to make certain the engine operates properly. If the engine performance is incorrect, the transmission will receive the wrong information. Many times what is perceived as a transmission problem is in actuality an engine problem. So before you make any attempt to diagnose a transmission problem, be sure engine systems are operating properly.

Keep in mind that this article deals with automatic transmissions in general. You should always check the proper service and repair manual for your vehicle for specific information.

What Is An Automatic Transmission?

There are two basic types of automatic transmission; the front wheel drive version called a Transaxle because it incorporates a differential and a rear wheel drive version called a Transmission that does not. Most people refer to the transaxle as a transmission and it is close enough. I just wanted to point out the major difference between the two.

Just like that of a manual transmission, the automatic transmission's primary job is to allow the engine to operate in its narrow range of speeds while providing a wide range of output speeds. An automatic transmission locks and unlocks different sets of gears to the output shaft to achieve the various gear ratios. In an automatic transmission; the same set of gears produces all of the different gear ratios. The planetary gearset is the device that makes this possible in an automatic transmission.

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» Part 1       » Part 2       » Part 3       » Part 4
» Part 5
Additional Information provided courtesy of
ALLDATAdiy.com and Warranty Direct
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