Transmission Control Systems: Testing and Inspection

Diagnostic Starting Point - Automatic Transmission

Begin the system diagnosis with Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle. Diagnostic System Check - Vehicle provides the following information:

* The identification of the control modules which command the system
* The ability of the control modules to communicate through the serial data circuit
* The identification and status of stored diagnostic trouble codes (DTCs)

The use of Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle identifies the correct procedure for diagnosing the system and where the procedure is located.

Symptoms

When it has been determined through Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle that no DTCs are present, begin symptom diagnosis by reviewing Transmission Component and System Description Transmission Component and System Description. Reviewing Transmission Component and System Description Transmission Component and System Description enables you to understand the operation of the system. This helps you determine if the condition described by the customer is normal or if a condition exists. If it is determined that a condition exists, identify the concern by referring to Symptoms - Automatic Transmission Symptoms - Automatic Transmission. Symptoms - Automatic Transmission Symptoms - Automatic Transmission provides common diagnostic categories which relate directly to diagnostic information or procedures.