Engine Controls - Self-Diagnostics: Introduction

CAUTION: DO NOT crank engine before replacement PCM is programmed to immobilizer system, or PCM will be severely damaged. If test procedures require replacement of PCM on a vehicle equipped with immobilizer system, vehicle must be sent to authorized Mazda dealer to have replacement PCM programmed.

NOTE: Vehicle with immobilizer system can be identified by a solid urethane ignition key head.

Perform all basic diagnostic procedures in BASIC DIAGNOSTIC PROCEDURES article. If no fault is found while performing basic diagnostic procedures, proceed with self-diagnostics. If no diagnostic trouble codes or only pass codes (system functioning properly) are found during self-diagnostics, proceed to TROUBLE SHOOTING - NO CODES article for diagnosis by symptom.