Engine Controls - Tests W/Codes - EEC: Introduction

Before proceeding with this article, ensure BASIC DIAGNOSTIC PROCEDURES in BASIC TESTING article have been performed. If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed with self-diagnostics. If no fault codes are present after entering self-diagnostics, proceed to H - EEC TESTS W/O CODES article in the ENGINE PERFORMANCE Section for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).