Engine Controls - System/Component Tests - EEC-IV: Introduction

Before testing separate components or systems, perform basic diagnostic procedures in BASIC TESTING article in the ENGINE PERFORMANCE section. Since many computer-controlled and monitored components set a trouble code if they malfunction, also perform self-diagnostic procedures in TESTS W/CODES - EEC-IV article in the ENGINE PERFORMANCE section.

NOTE: Testing individual components does not isolate shorts or opens. Perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with 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.

NOTE: In the following tests, illustrations are courtesy of Ford Motor Co.