System Components

The MS S52 engine control system incorporates two separate, equivalent processors. However, the functions of the two processors are different. The functions of the first processor include:

• Load acquisition control
• Electronic throttle control (EDR)
• Idle actuator control
• Ignition and Knock control

The functions of the second processor include:

• Fuel injection control
• Engine speed limitation
• Misfire detection
• OBD II monitoring
• DTML control (leak diagnosis)

Fig 1: Identifying Processors

Courtesy of BMW OF NORTH AMERICA, INC.