Engine Controls - System/Component Tests - Gasoline: Introduction

Prior to testing separate components or systems, it is recommended that all procedures listed in BASIC TESTING article in the ENGINE PERFORMANCE Section be performed. Since many computer controlled and monitored components will set a service code if they malfunction, check EEC-IV system and retrieve service codes. See Quick Test procedure in TESTS W/CODES article in the ENGINE PERFORMANCE Section. If service codes are present see appropriate CIRCUIT TEST in TESTS W/CODES article in the ENGINE PERFORMANCE Section.

NOTE: Testing individual components does not isolate wiring circuit shorts or opens. Perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) that has a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.

NOTE: For wiring diagrams not shown in testing procedures, see WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section.