911 Carrera 4S Coupe AWD F6-3600cc 3.6L SOHC (1997)
Throttle Position Sensor: Description and Operation
THROTTLE POTENTIOMETER
A throttle potentiometer on the shaft is used to determine the angular position of the throttle shaft. The "O" position (engine idle position) of the
potentiometer is determined in an adaptive process by the DME control unit.
If the battery has been disconnected or the control unit has been separated from the system, the engine must be restarted with the throttle valve fully
closed.
A self-adaptive unit always selects the smallest opening angle of the throttle as the engine idle position. If the throttle moves to 'open', the engine idle
settings are switched off by the control unit as soon as an opening angle of 1 is reached.
When a throttle opening angle of approx. 66° is reached, the control unit actuates the full-load feature. Using the "Actual values" menu on the system
tester, the current opening angle of the throttle can be read off in degrees. In this manner the accelerator cable setting can be checked.
When the throttle is in the zero position, the throttle angle display must be 0°. With the accelerator pedal fully depressed, i.e. with the throttle fully
open, the throttle angle display must read 84° ± 3°.
