Electric Throttle Valve (EDK) Control

• The throttle valve assembly of the M62 TU is an electric throttle valve (EDK) controlled by an integral EML function of the ME 7.2.
• The throttle plate is positioned by a gear reduction DC motor drive.
• The motor is controlled by proportionately switched high/low PWM signals at a basic frequency of 2000 Hz.
• Engine idle speed control is a function of the EDK. Therefore, the M62 TU does not require a separate idle control valve.

Fig 1: Identifying Electric Throttle Valve (EDK) Schematic

Courtesy of BMW OF NORTH AMERICA, INC.

EDK ADAPTATION PROCEDURE: 

When a replacement EDK is installed the adaptation values of the previous EDK must be cleared from the ME 7.2 control module.

1. From the Service Function Menu of the DIS/MoDiC, clear adaptation values.
2. Switch the ignition OFF for 10 seconds.
3. Switch the ignition ON (KL 15). At approximately 30 seconds the EDK is briefly activated allowing the ME 7.2 to "electrically learn" the new component.

This procedure is also necessary after replacing an ME 7.2 control module. However, the adaptation values do not require clearing since they have not yet been established.

Fig 2: Identifying Electric Throttle Valve (EDK) Components

Courtesy of BMW OF NORTH AMERICA, INC.