Section 35 (Engine Control System - Basic Diagnostic Procedures): Summary
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If no faults were found while performing basic diagnostic procedures, or no trouble codes (or only intermittent ones) were found while performing powertrain diagnostic system check, and driveability problems still exist, proceed to appropriate TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO-START, etc.) or intermittent diagnostic procedures.