BMW 1999-2005 M3 Service Manual page 130

Engine-General
16 of 19
http://ebahn.bentleypublishers.com/BMW/3/E46/Repair%20Manuals/1...
If the fault causes increased air flow
(actuator failed open), VANOS and
knock control are deactivated. This
reduces engine performance
noticeably.
Throttle control: The throttle valve plate
is electronically operated for precise
throttle operation, OBD II compliant for
fault monitoring, and ASC/DSC and
cruise control. This integrated electronic
throttle reduces additional control
modules, wiring and sensors. Adjusting
electronic throttles is not permitted and
the throttle assembly must be replaced
as a unit if found to be faulty.
The throttle assembly for the MS 42.0
system is referred to as the MDK (Motor
Driven Throttle Valve). The MDK is
identified as follows:
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) when the MDK system
is in the failsafe mode.
The throttle assembly for the MS 43.0
system is referred to as the EDK
(Electronic Throttle Valve). The EDK is
identified as follows:
The accelerator position
potentiometers (PWG) are located
in the accelerator pedal assembly.
The EDK is fully electronic. The
accelerator pedal is not
mechanically linked to the EDK.
2/25/2009 9:58 PM