Engine Controls - Tests W/Codes - 4-CYL: Introduction

NOTE: For MX-3 1.8L information, see TESTS W/CODES - 6-CYL article.

If no faults were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed with self-diagnostics. If no fault codes or only pass codes are present after entering self-diagnostics, proceed to TESTS W/O CODES article for diagnosis by symptom (i.e. ROUGH IDLE, NO START, etc.).