Engine Controls - System/Component Tests: Introduction: Notes
NOTE:
Testing individual components does not isolate wiring circuit shorts or opens. Perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) that has a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.
NOTE:
For wiring diagrams not shown in testing procedures, see WIRING DIAGRAMS at the end of this article.
Before testing separate components or systems, perform all procedures listed in BASIC TESTING article in the ENGINE PERFORMANCE section. Since many computer controlled and monitored components will set a service code if they malfunction, check EEC-IV system and retrieve service codes. See QUICK TEST in appropriate TESTS W/CODES - EEC-IV article in the ENGINE PERFORMANCE section. If service codes are present see appropriate CIRCUIT TEST in TESTS W/CODES - EEC-IV article in the ENGINE PERFORMANCE section.