Air Management: Notes

Throttle Valve:  The throttle valve plate is electronically operated to regulate intake air flow by the ECM. The purpose is for precision throttle operation, OBD II compliant for fault monitoring, ASC/DSC and cruise control. This integrated electronic throttle reduces extra control modules, wiring, and sensors. Adjusting electronic throttles is not permitted, the throttle assembly must be replaced as a unit. The adaptation values must be cleared and adaptation procedure must be performed using the DISplus/MoDIC. 

The throttle assembly for the MS42  system is referred to as the MDK (Motor Driven Throttle Valve). The MDK  is distinguished by:

• The accelerator position potentiometers (PWG = driver's wish) are integrated in the MDK housing. 
• A throttle cable is used to actuate the accelerator pedal position potentiometers and also serves as a backup to open the throttle plate (full control) if the MDK system is in failsafe. 

The throttle assembly for the MS43  system is referred to as the EDK.  The EDK is distinguished by:

• EDK does not contain a PWG, It is remotely mounted (integrated in the accelerator pedal assembly). 
• The accelerator pedal is not mechanically "linked" to the EDK