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Throttle position

Throttle position



Throttle position sensor

The throttle position sensor in the MOTRONIC system consists quite simply of a variable resistor controlled by the position of the throttle butterfly which regulates the signal level and so supplies the control module with information on the current throttle opening.

Pin 1 of the throttle position sensor receives power (5 V) from pin 12 of the control module. Pin 2 is grounded through pin 30 of the control module.

Information on the current angle of the throttle is sent from pin 3 of the sensor to pin 53 of the control module. Signal voltage varies between about 0.5 V (idling) and about 4.5 V (full throttle).

In the event of a break or short circuit in the circuit, the CHECK ENGINE lamp (MIL) lights up.

Throttle angle

A signal containing information on the current throttle angle goes out from pin 54 of the control module. This information is used by the automatic transmission control module and the TCS control module.

The signal is a 100 Hz PWM signal of approx.


• 1.2 V at idling speed

• 2.0 V at 2500 rpm (no load)

• 12 V at full throttle.

With only the ignition switch in the Drive position, or at an engine speed below 500 rpm, the MOTRONIC control module puts out a temperature signal (coolant) on pin 54.

This temperature signal is utilized by the AF22 control module for selecting the right shifting pattern when driving off and by the TCS control module as a test signal which is returned to pin 38 of the MOTRONIC control module. See for further information on this test signal (TCS active).