This procedure involves attaching a small diagnostic computer to a terminal in your vehicle if your transmission is computer controlled. This device is then used to address your computer to determine if any trouble codes are present and to “read” the output from numerous electrical sensors that feed information to the computer. All of this information is useful in determining the integrity of the electrical control system for the transmission. Scanners have become very important in the diagnostic process.
Note: Expect a nominal charge for this service.
Also note: When the computer “sees” any parameter from various sensors that do not fit established criteria, the computer will set a code for each error. However, there are some errors that will be present that the computer will not sense because they are within the normal range but are not necessarily valid. In that case, the system has to be diagnosed to determine if applicable sensors or other electrical components are performing incorrectly and creating an abnormal transmission operational response.
