Engine Controls - Tests W/Codes: Introduction

Perform all Basic Diagnostic Procedures in the BASIC TESTING article. If no faults were found while performing Basic Diagnostic Procedures, proceed with self-diagnostics. If no Diagnostic Trouble Codes (DTCs) are present after entering self-diagnostics, proceed to the TESTS W/O CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).