Diagnostic Starting Point - Automatic Transmission: Notes

Begin the system diagnosis with DIAGNOSTIC SYSTEM CHECK -- ENGINE CONTROLS in Engine Controls. The Diagnostic System Check provides the following information:

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

The Use Of DIAGNOSTIC SYSTEM CHECK -- ENGINE CONTROLS in Engine Controls identifies the correct procedure for diagnosing the system and where the procedure is located.