Engine Controls - System/Component Tests - Diesel: Introduction
Before testing separate components or systems, perform procedures in appropriate BASIC TESTING article in the ENGINE PERFORMANCE Section. Since many computer-controlled and monitored components set a trouble code if they malfunction, also perform procedures in appropriate TESTS W/CODES article in the ENGINE PERFORMANCE Section.
NOTE:
Testing individual components does not isolate shorts or opens. Perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless otherwise instructed in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.