Section 4 (Engine Controls - Tests W/Codes): Introduction

WARNING: This page is about a different car, the 1990 Cadillac Fleetwood and 1990 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: If no trouble codes were found while performing BASIC DIAGNOSTIC PROCEDURES in BASIC TESTING article, proceed with ENTERING SELF-DIAGNOSTICS. If no trouble codes or only pass codes are present after entering self-diagnostics, proceed to TESTS W/O CODES article for diagnosis by symptom (i.e. ROUGH IDLE, NO START, etc.).