Introduction

Schematic View - MS41.1 Inputs/Outputs:

The Siemens engine management system is introduced on US production vehicles for the first time with the M52 engine. The MS40.x system has been used by BMW in other markets for several years. Operation of the New Siemens MS41.1 System is similar to the Bosch DME M5.x versions currently in use. It complies with the 1996 Federal OBD II requirements for emission control and monitoring.

The MS41.1 system includes the following output control functions:
- Ignition Control
- Fuel Injection Control
- Idle Speed Control
- Oxygen Sensor Heating
- Purge Control
- Main Relay/Fuel Pump Relay Control
- VANOS Control
- Exhaust Flap Control
- ASC Control (ignition/injection)
- A/C Compressor Control
- EWS II Drive Away Protection
- OBD II Fault Monitoring

The following components of the engine management system are manufactured by Siemens along with the engine control module:
- Hot Film Air Mass Meter
- Dual Engine Coolant Temperature Sensor
- Intake Air Temperature Sensor
- Crankshaft Position Sensor
- Camshaft Position Sensor
- Oxygen Sensors
- Knock Sensors

The following components of the engine management system are supplied as BMW parts:
- Ignition Coils
- Pressure Regulator
- Fuel Injectors
- Throttle Potentiometer
- Purge Valve
- Idle Control Valve