Engine Control System & Engine Component Tests - 2.5L Engine: Introduction
Before testing separate components or systems, perform procedures in BASIC TESTING - 2.5L 4-CYL article. Since many computer-controlled and monitored components set a trouble code if they malfunction, also perform procedures in appropriate TESTS W/CODES - 2.5L 4-CYL article.
NOTE:
Testing individual components does not isolate possible short or open circuits. Unless stated otherwise in test procedure, perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) having a minimum 10-megohm input impedance. Use ohmmeter to isolate wiring harness short or open circuits.