Section 20 (Engine Controls - System/Component Tests): Introduction

WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 1997 BMW Z3, 1997 BMW 840Ci, 1997 BMW 740iL, 1997 BMW 740i, and 1997 BMW 540i. However, it is still accessible from the selected car via links, so may be relevant.

Before testing separate components or systems, perform procedures in BASIC TESTING article. Since many computer-controlled and monitored components set a trouble code if they malfunction, also perform procedures in TESTS W/CODES 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 TESTS W/CODES article. Resistance values can be measured directly on component. See WIRING DIAGRAMS article for additional information.