Engine Controls - Tests W/Codes - 5.2L: Introduction

If no faults were found while performing F - 5.2L BASIC TESTING article, proceed with self-diagnostics. If no fault codes or only pass codes are present after entering self-diagnostics, proceed to TEST NF-1A  and TESTS W/O CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).