Self-Diagnostic System: Notes
CAUTION:
Accessing self-diagnostics for 30 minutes without running engine will discharge battery, resulting in a possible no-start condition. To ensure proper operation, attach battery charger to battery.
NOTE:
Diagnostic trouble code tests are written specifically for use with GM Tech I or Tech II scan tools. Generic scan tool can be used but may have limited functions. This article only covers the portion of those systems which relates to charging system diagnosis. For further information, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE or BODY CONTROL MODULES - CTS article in ACCESSORIES & EQUIPMENT.