Section 12 (Engine Controls - System/Component Tests - 4.2L): Introduction

WARNING: This page is about a different car, the 1997 Ford Econoline and 1997 Ford Club Wagon. However, it is still accessible from the selected car via links, so may be relevant.

Before testing separate components or systems, perform appropriate procedures in BASIC TESTING - 4.2L article. Since many computer-controlled and monitored components set a Diagnostic Trouble Code (DTC) if they malfunction, also perform procedures in TESTS W/CODES - 4.2L 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 - 4.2L article.

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