Engine Controls - System/Component Tests 3.0L: Introduction

NOTE: Testing individual components does not isolate wiring circuit shorts or opens. Perform all voltage tests using 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 at the end of this article.

Before testing separate components or systems, perform all procedures listed in BASIC TESTING - 3.0L article. Since many computer controlled and monitored components will set a service code if they malfunction, check EEC system and retrieve service codes (DTCs). See QUICK TEST in TESTS W/CODES article. If service codes are present, see appropriate CIRCUIT TEST in TESTS W/CODES article.