Section 12 (Engine Controls - Tests W/Codes - 4.9L): Introduction
WARNING: This page is about a different car, the 1995 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
If no diagnostic trouble codes were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed with self-diagnostics. If no diagnostic trouble codes are present after entering self-diagnostics, proceed to TESTS W/O CODES article in the ENGINE PERFORMANCE section for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).