Functional description

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The throttle valve opening angle in the electromotive throttle actuator is monitored by 2 hall effect sensors.

The throttle valve is moved by an electric actuator motor. This actuator motor is actuated by a pulse width modulated signal with a basic frequency of 1000 Hz.

Fig 1: Identifying Throttle Valve, Actuator And Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.

Item	Explanation
1	Throttle valve
2	Throttle actuator
3	six-pin plug connection

The throttle valve has a mechanical adjusting range of 0 to 90°. The maximum position that is actually moved to is 81° (corresponds to 100 % throttle valve opening).

In the de-energised state, the throttle valve is held in the emergency running position of approx. 5.2° by 2 throttle return springs. These two springs also ensure that the throttle valve is returned to this position in the event of a fault (actuation deactivated). The DME converts the required throttle opening setpoint value into an actuation command using the measured actual position. The diagnosis monitors both hall effect sensors for electrical functionality (short circuit to ground, short circuit to B+ and line disconnection) and for the plausibility of the sensor signal.

The diagnosis runs continuously as soon as the following preconditions are satisfied:

Terminal 15 on
No electrical fault detected