Computerized Engine Controls: Notes

Powertrain Control Module (PCM) receives and processes sensor input and sends output signals to adjust injector pulse widths and ignition timing. Systems can be diagnosed using generic scan tool or, for more complete diagnosis, using BMW Mobile Diagnostic Information Center (MoDiC). See Fig 1. See BMW MODIC DIAGNOSTIC TESTER . Engine management system, which operates in conjunction with other computer-controlled systems, controls fuel injection and ignition under variable operating conditions. Engine management system controls air/fuel mixture and exhaust emissions by adjusting fuel injection and ignition timing. See ENGINE MANAGEMENT SYSTEM  table.