System Components

MS45 Engine Control Module  : The Engine Control Module (ECM) features a single printed circuit board with two 32-bit microprocessors.

The task of the first processor is to control:

• Engine Load
• Electronic Throttle
• Idle Actuator
• Ignition
• Knock Control

Fig 1: Identifying Control Module

Courtesy of BMW OF NORTH AMERICA, INC.

The task of the second processor is to control:

• Air/ Fuel Mixture
• Emission Control
• Misfire Detection
• Evaporative Leak Detection

Fig 2: Identifying Control Module Connector Locations

Courtesy of BMW OF NORTH AMERICA, INC.

The 134 pin ECM is manufactured by Siemens to BMW specifications. The ECM is the SKE (standard shell construction) housing and uses 5 modular connectors. For testing, use the Universal Adapter Set (break-out box) Special Tool # 90 88 6 121 300. 

System Components: Inputs - Processing - Outputs 

Fig 3: Identifying Control Unit Inputs & Outputs

Courtesy of BMW OF NORTH AMERICA, INC.