Engine Controls - Tests W/Codes - EEC: Introduction

Before proceeding with this article, ensure steps in BASIC TESTING article have been performed. If no faults were found while performing procedures in the BASIC TESTING article, proceed with self-diagnostics. If no fault 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.).