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 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. Proceed to the QUICK TEST in the appropriate TESTS W/CODES - EEC-IV article in this section. If service codes are present, refer to the appropriate CIRCUIT TEST in the TESTS W/CODES - EEC-IV article in this section.