Diagnostic Starting Point - Automatic Transmission: Notes
WARNING: This page is about a different car, the 2003 GMC Safari and 2003 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
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.