Flow of Diagnosis
DIAGNOSISINTRODUCTION
The systematic troubleshooting information covered by this Section offers a practical and systematic approach to diagnosing 4L30-E transmission, using information that can be obtained from road tests, electrical diagnosis, oil pressure checks or noise evaluation.
The key to correcting a complaint is to make use of all of the available symptoms and logically letting them direct you to the cause.
When dealing with automatic transmission complaints, it is best to gather as many symptoms as possible before making the decision to remove the transmission from the vehicle.
Frequently, the correction of the complaint does not require removal of the transmission from the vehicle.
DRIVER INFORMATION
To analyze the problem fill out a complete description of the owner's complaint. Please draw a circle around the right information and complete the following form. (The next page is an example of a completed form.) You can draw a circle around many numbers if you are not sure.
GENERAL DIAGNOSIS PROCEDURE
