Throttle Position Sensor Description

The throttle position sensor interface consists of 2 analogue signals from which Driver Demand is determined. See Fig 1 .

There are three Throttle Position Sensor diagnostic checks, a fault is detected if:

1. The enabling conditions have been meet and the signal voltage from potentiometer number 1 is less than 0.25 volts or the signal voltage from potentiometer number 2 is less than 0.19 volts.
2. The enabling conditions have been meet and the signal voltage from either of the potentiometers exceeds 4.75 volts.
3. The engine speed is greater than 1320 RPM and the difference between the two potentiometer signals is greater than 6.3%.
4. The engine speed is greater than 1320 RPM, the difference between the 2 potentiometer signals is greater than 6.3% and the difference between the potentiometer signal and substitute throttle position is greater than 10.2%.

Fig 1: Throttle Position Sensor Monitoring & Enabling Conditions

Courtesy of LAND ROVER NORTH AMERICA, INC.