Section 131 (Engine Controls - System & Component Tests - EEC-V): Introduction

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Before testing separate components or systems, perform basic diagnostic procedures in appropriate F - BASIC TESTING article. Since many computer-controlled and monitored components set a Diagnostic Trouble Code (DTC) if they malfunction, also perform self-diagnostics in appropriate G - TEST W/CODES 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 DVOM to isolate shorted or open wiring harness.

NOTE: For identification of circuits and terminals referenced in test procedures, see appropriate WIRING DIAGRAMS article.