This relearning is done using a bidirectional scan tool that can program the new values into the ECU.
![throttle position sensor throttle position sensor](https://i5.walmartimages.com/asr/cd5ad872-0c70-4add-b19c-2b51b6d431ac_1.a2c2297875f45565c35f6c72789cf7ff.jpeg)
The ECU will have to relearn the position of closed to wide-open.
![throttle position sensor throttle position sensor](https://www.mgfcar.de/sensor/tps_sc02189.jpg)
In this case the throttle body should be cleaned, however be aware that most modern cars will throw new error codes, with a freshly cleaned throttle body as the ECU will be adapted to a completely different range of voltage. TPS error codes can also be due to a dirty throttle body, where the accumulated dirt/carbon particles do not allow the throttle plate to close fully allowing air flow through, when it should be closed. Dead spots will be displayed as a sudden drop/increase of voltage instead of being proportionate to the throttle plate angle. Dead spots in the TPS sensor can more easily be identified using a volt meter with a graphing capability or an oscilloscope.
#THROTTLE POSITION SENSOR DRIVER#
The last wire is used for ground.ĭead spots will in the TPS sensor, will result in engine hesitation when pressing on the gas pedal, as the ECU will think that the driver got of the gas pedal and therefore reduce fuel delivery. One wire is used for the output, which is the reference signal going through a variable resistance, decreasing to a new voltage and being sent back to the ECU (so the ECU can identify the throttle position). One wire is used for a +5V reference signal (sent by the ECU – Engine Control Unit) entering the TPS sensor. The TPS sensor is usually a 3 wire configuration. Designed by engineers with a background in Formula 1 and LMP racing, the ACUITY hall effect sensor uses a contactless design that is highly resistant to. So the more open the throttle is, the less resistance is applied in the potentiometer. The TPS sensor is a potentiometer, a variable resistance that decreases in proportion to the throttle plate position. On drive-by-wire cars, the TPS sensor is fitted to one end of the shaft, and an electrical motor is fitted to the other end of the shaft. The TPS sensor is usually fitted on the shaft of the throttle plate.
![throttle position sensor throttle position sensor](https://www.supercheapauto.com.au/dw/image/v2/BBRV_PRD/on/demandware.static/-/Sites-srg-external-master-catalog/default/dw579cc981/images/SPO3308247/SCA_SPO3308247_hi-res.jpg)
The ECU combines the data from these sensors to get a very accurate measurement as well as used the data from these sensors to validate the sensor functionality. The TPS sensor overlaps with the MAF, MAP and IAT sensor, in the sense that they all measure the amount of air (and air density) that is entering the engine.