Engine Controls - Tests W/Codes - EEC-IV (5.8L): Introduction

Perform all steps in BASIC TESTING article in the ENGINE PERFORMANCE section. If no fault is found while performing BASIC TESTING , proceed with self-diagnostics. If no diagnostic trouble codes or only pass codes (system functioning properly) are found during self-diagnostics, proceed to TESTS W/O CODES (EEC-IV) article in the ENGINE PERFORMANCE section for diagnosis by symptom.