Diagnostic Starting Point - Automatic Transmission: Notes

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

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

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