Engine Controls - Tests W/Codes: Introduction
If no trouble codes were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed with self-diagnostics. If no trouble codes or only pass codes are present after entering self-diagnostics, proceed to TESTS W/O CODES article in this Section for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).
NOTE:
All figures in this article are a courtesy of General Motors. Corp.