Engine Controls - System/Component Tests - EEC-IV (4.0L): Introduction

Before testing separate components or systems, perform procedures in BASIC TESTING - 4.0L article. Since many computer-controlled and monitored components set a trouble code if they malfunction, perform procedures in TESTS W/CODES - EEC-IV (4.0L) article.

NOTE: Testing individual components does not isolate short or open circuits. 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 shorted or open wiring harness.

NOTE: For WIRING DIAGRAMS not shown in testing procedures, see WIRING DIAGRAMS .

NOTE: In following tests, circuit diagrams and illustrations are courtesy of Ford Motor Co.