Throttle Valves

Throttle Valves MSS65

Functional description, see BMW Service Technology:
TIS -> Document -> SI Technology -> Enter SBT Number
SBT number:
- 11 04 04 097

Overview of functions
The throttle valves are operated for each bank via a throttle-valve actuator. Communication between the DME and throttle-valve actuator runs across a separate Local CAN. In addition, there is a so-called Enable line (S_DK1/S_DK2) between the DME and throttle-valve actuator. Across this Enable line, the DME can switch off the throttle-valve actuator if there are communication faults on the Local CAN.

Pin 4 on the throttle-valve actuator of bank 1 is switched to ground. This makes it possible to detect which throttle-valve actuator is fitted on which bank.

Throttle-valve sensors
A throttle-valve sensor is fitted to the throttle valve bearing shaft of each bank. Two Hall sensors are integrated in each sensor. One Hall sensor is directly connected to the throttle-valve actuator; the other Hall sensor is directly connected to the DME.

The position control of the throttle valves runs at each throttle-valve actuator as follows:
- The DME sends the position nominal value across Local CAN to the throttle-valve actuator.
- The throttle-valve sensor helps the throttle-valve actuator to set the position of the throttle valves. The Hall sensor connected to the throttle-valve actuator returns the measured position value to the throttle-valve actuator.
- The throttle-valve actuator returns the measured position value via Local CAN to the DME.
- The second Hall sensor also returns the measured position value across a separate cable to the DME.
- The DME can now compare the two position values and it stores a fault in the event of excessive deviations.