Engine Controls - System/Component Tests - Non-Turbo: Introduction
NOTE:
In this article, Engine Control Module (ECM) may also be referred to as Engine Control Unit (ECU).
Before testing separate components or systems, perform procedures in the BASIC TESTING article. Since many computer-controlled and monitored components set a trouble code if they malfunction, also perform procedures in the TESTS W/CODES article.
NOTE:
Testing individual components does not isolate shorts or opens. Unless stated otherwise in test procedure, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance. Use ohmmeter to isolate wiring harness shorts or opens.