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Engine Controls Self-Diagnostics - Introduction: Introduction

NOTE: For self-diagnostics information on Passport, refer to Rodeo in Isuzu SELF-DIAGNOSTICS - INTRODUCTION article.
NOTE: Engine Control Module (ECM) is used on vehicles equipped with manual transmissions. Powertrain Control Module (PCM) is used on vehicles equipped with automatic transmissions. ECM will be referred to as PCM.

If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES , proceed with self-diagnostics. If no Diagnostic Trouble Codes (DTCs) or only pass codes exist after entering self-diagnostics, proceed to TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).

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