Engine Controls - Tests W/Codes - Engine Performance: Introduction: Notes

Perform all steps in appropriate BASIC DIAGNOSTIC PROCEDURES article. If no fault is found while performing checks in BASIC DIAGNOSTIC PROCEDURES article, proceed with self-diagnostics. If no Diagnostic Trouble Codes (DTCs) or only pass codes (system functioning properly) are found during self-diagnostics, proceed to appropriate NTC test under SELF-DIAGNOSTIC TESTS , or see appropriate TROUBLE SHOOTING - NO CODES article for diagnosis by symptom.