EML Systems - Function Description

Siemens:
Siemens MS42.0 is a completely new development in engine management systems. MS42.0 meets the needs of Low Emission Vehicle (LEV) compliancy and continuing with present systems is also OBD II compliant.

The MS42.0 control module also includes control of the Motor- Driven Throttle Valve (MDK).

MS42.0 is currently used in E46 323i & 328i vehicles equipped with the M52 TU engine.

The concept of MS42.0 greatly differs from previous EML systems for the MDK operation.

The ECM uses a pc-board single- processor control unit in the new SKE housing. Mounted in new E-Box location (next to brake master cylinder). The MS 42.0 ECM is flash programmable.

ECM hardware includes:
Modular plug connectors featuring 5 connectors in the SKE housing with 134 pins.
- Connector 1 = Supply voltages and grounds
- Connector 2 = Peripheral signals (oxygen sensors, CAN, etc.)
- Connector 3 = Engine signals
- Connector 4 = Vehicle signals
- Connector 5 = Ignition signals

Special features:
- Flash EPROM which is adaptable to several M52 LEV engines and has the capability to be programmed up to 13 times.
- Once a control unit is installed and coded to a vehicle it cannot be swapped with another vehicle for diagnosing or replacement (because of EWS 3.3). A new ECM must be installed if necessary.