Engine Controls - Tests W/Codes - 2.5L: Introduction

If no faults were found while performing procedures in BASIC TESTING - 2.5L article, proceed with self-diagnostics. If no fault codes or only pass codes are present after entering self-diagnostics, proceed to H - TESTS W/O CODES - 2.5L article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).