Engine Controls - Self-Diagnostics - 2.5: Introduction

NOTE: Electronic Concentrated Control System (ECCS) control module is referred to as Engine Control Module (ECM).

If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES , proceed with self-diagnostics. Using scan tool, review and record all DTC and freeze-frame information available. If no DTCs are present after entering self-diagnostics, proceed to TROUBLESHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).