An electronic throttle actuator (EDR) is used to adjust engine load based on throttle position requests received by the EMS2000 from the accelerator pedal position sensor. A DC-Motor electrically positions the throttle plate from idle to full load. The feedback of the position of the throttle plate and the position of the DC-Motor is achieved via 2 potentiometers, which are integrated in the throttle body.

The MINI COOPER throttle body is 52 mm internal diameter.
The MINI COOPER S throttle body is 57 mm internal diameter.

Fig 1: EDR Throttle Actuators

Courtesy of BMW OF NORTH AMERICA, INC.

The EDR is operated by the EMS2000 for opening and closing of the throttle based on accelerator pedal position, DSC intervention and Cruise Control function. The EDR is a DC motor operating a gear driven throttle plate.

A variable duty cycle fixed frequency signal is sent to the EDR motor by the EMS2000. The EMS2000 switches polarity on the signal to the EDR motor at the rate of 600 Hz (600 times per second) to maintain throttle position. Position and movement of the throttle plates is confirmed through the dual feedback potentiometers control functions.

The EMS2000 also provides power and ground for the feed back potentiometers.

Fig 2: Electric Throttle Valve Circuit Diagram

Courtesy of BMW OF NORTH AMERICA, INC.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

System Outputs: EDR: Notes

Use the Manual With the Right Hardware

When to See a Mechanic

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