Throttle Position

THROTTLE POSITION

Throttle Position Sensor
The Throttle Position Sensor in the MOTRONIC system consists 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 3 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 0.7 V (idling) and about 4.5 V (full throttle).

In the event of a break in the circuit, the CHECK ENGINE lamp (MIL) lights up and the control module starts to use a preprogrammed signal voltage corresponding to a throttle opening of 310, causing the idling speed to rise above 1500 rpm.

Throttle Angle
A signal containing information on the current throttle angle goes out from pin 52 of the control module. This information is used by the automatic transmission control module.

The signal is a 100 Hz PWM signal of approx.
^ 1.3 V at idling speed
^ 2.2 V at 2500 rpm (no load)
^ 12 V at full throttle.