Engine Controls - Tests W/Codes - 2.8L: Introduction

If no faults were found while performing basic diagnostic procedures, proceed with self-diagnostics. If no Diagnostic Trouble Codes (DTCs) or only pass DTCs are present after entering self-diagnostics, proceed to H - TESTS W/O CODES - 2.8L article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).