Begin the system diagnosis with Diagnostic System Check - Vehicle . The Diagnostic System Check - Vehicle provides the following information:
| • | The identification of the control modules which commands 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 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 that no DTCs are present, begin symptom diagnosis by reviewing Transmission Component and System Description . Reviewing 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 provides common diagnostic categories which relate directly to diagnostic information or procedures.
