Throttle Position Sensor: Description and Operation

The throttle valve assembly consists of the DK housing with the throttle valve plate, return spring, drive motor and two feedback potentiometers.

The dual feedback potentiometers signal the movement and position of the throttle plate to each processor. The two potentiometers have separate power and ground circuits to ensure the reliability of their operation.

The dual redundancy system allows the EML IIIs to continue operation, without driver inconvenience, if one potentiometer fails. If the self diagnosis of the EML IIIs detects a fault with one of the potentiometers, it will switch off the affected circuit and continue operation. The fault will be logged in memory and the EML fault warning will be displayed in the instrument cluster.