Engine Controls - Self Diagnostics: Introduction

Perform all steps in appropriate BASIC DIAGNOSTICS PROCEDURES article. If no fault is found while performing basic diagnostic procedures, proceed with self-diagnostics. If no Diagnostic Trouble Codes (DTCs) are present after entering self-diagnostics, perform TEST NTC-1: NO TROUBLE CODE TEST MENU  located after DTC tests under DIAGNOSTIC TESTS for engine diagnosis. If after performing TEST NTC-1, problem is not identified and repaired, proceed to appropriate TROUBLE SHOOTING - NO CODES - EXCEPT DIESEL article for diagnosis by symptom.