9-5 Sport Wagon (9600) V6-3.0L Turbo (B308) (2003)
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Accelerator Pedal Position Sensor: Description and Operation
Pedal Position Sensor
The accelerator is connected by a standard cable to two pedal position sensors located in the throttle body.
The sensors are placed in the throttle body because the throttle cable can then easily be connected to the throttle valve spindle if a fault occurs in the
throttle control system.
The pedal position sensors consist of two potentiometers which are supplied with 5 V from control module pins 69 and 46, which are connected together
internally in the throttle body. The sensors are grounded via control module pins 22 and 70, which are also connected internally in the throttle body.
The voltage from sensor 1 is applied to control module pin 56 and decreases as the pedal is depressed.
The voltage from sensor 2 is applied to control module pin 9 and increases as the pedal is depressed.
The total voltage of the two sensors is always approximately 5 V. If the total differs too much from 5 V a fault has occurred in one of the potentiometers
or in their circuits.
The system enables the pedal position to be determined with a high degree of accuracy.
The control module uses the value from sensor 1 as an indicator of the driver's torque request. The value is converted into requested air
mass/consumption and constitutes the most important input signal for air mass control.
When the pedal is fully released, the control module adapts the voltage from sensor 1. When the accelerator is fully released, the air mass/consumption
required = 0 and if the car speed = 0 also, the idle speed control will be activated.
Diagnostics
