Self-Diagnostic System: Notes

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: The following test is written specifically for Tech 2 scan tool. A generic scan tool may not be capable of performing all necessary test functions.

Begin system diagnosis with engine electrical diagnostic system check. Diagnostic system check will provide following information:

Identification of control module(s) which command system.
Ability of control module(s) to communicate through serial data circuit.
Identification of any stored DTCs and their current status.

Using diagnostic system check will identify correct procedure for diagnosing system and where procedure is located. This article only covers the portion of those systems which relates to charging system diagnosis. For further information, see appropriate SELF-DIAGNOSTICS - 4.3L CHEVY EXPRESS & SAVANA article in ENGINE PERFORMANCE or BODY CONTROL MODULES - CHEVY EXPRESS & SAVANNA article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.