Engine Controls - System & Component Testing: Introduction

Before testing separate components or systems, perform procedures in BASIC DIAGNOSTIC PROCEDURES article. Since many computer-controlled and monitored components set a trouble code if they malfunction, also perform procedures in SELF-DIAGNOSTICS article.

NOTE: System and component testing of BMW 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. Diagnostic Trouble Codes (DTCs) can also be assessed using generic scan tool connected to Data Link Connector. See SELF-DIAGNOSTICS article. Resistance values can be measured directly on component. See WIRING DIAGRAMS article for additional information.