Air Management: Notes

Fig 1: Identifying Air Management

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.

Fig 2: Identifying Throttle Valve

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

Fig 3: Identifying Throttle Assembly