Engine Controls - Tests W/Codes - 7.5L EEC-IV: Introduction

NOTE: This article covers 7.5L with Federal emissions. For testing on all other 7.5L van models, see the TESTS W/O CODES - 7.5L EEC-V article.

Perform all steps in the BASIC TESTING - 7.5L article. If no fault is found, proceed with self-diagnostics. If no diagnostic trouble codes or only pass codes (system functioning properly) are found during self-diagnostics, see TESTS W/O CODES - 7.5L EEC-IV article for diagnosis by symptom.