Engine Controls - System/Component Tests: Introduction

Before testing separate components or systems, perform basic diagnostic procedures in the BASIC TESTING article. Since many computer-controlled and monitored components set a trouble code if they malfunction, also perform self-diagnostic procedures in the BMW SELF DIAGNOSIS article.

NOTE: System and component testing of BMW DME/Motronic engine management system is best accomplished using the BMW MoDIC (hand-held scan tester), BMW Service Tester (Sun 2013 Engine Analyzer) and applicable BMW diagnostic software. Tester permits technician to activate components and monitor "status" inquiries. System and component testing information not available at time of publication; only resistance values of individual components are included in this article. Resistance values can be measured directly on component. See WIRING DIAGRAMS article for additional information.