Throttle position sensor malfunctions. Free Technical Library article

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Throttle position sensor malfunctions

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Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic fuel injection

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Photo 1 shows the TPS (2112-1148200) with the cover removed. Being installed on the car "VAZ 2110" (which is equipped with the injection system "BOSCH M1.5.4"), this sensor served for about 4500 km. vehicle mileage and led to idling problems.

While the car was moving, when the gear was turned off, the engine sometimes stopped. When accelerating, jerks appeared, idle speed did not stabilize in almost all engine operating modes. The "CHECK ENGINE" light came on intermittently. Because the symptoms clearly indicated a malfunction of the TPS, reading error codes was not required. The faulty sensor was simply replaced with a new one and all problems were solved.

The cause of the sensor failure was simple. The design of this TPS includes a substrate (see photo 2), a resistive layer is deposited on it. At the very beginning of the potentiometer slider stroke, this coating was rubbed to the base (in photo 3 it is shown by white arrows). As a result, the sensor did not provide a linear increase in the output signal voltage, which led to the problems discussed above. Unfortunately, this is not the only reason that can lead to similar symptoms of a TPS malfunction. A slider may also be a possible cause of the sensor's inoperability.

Photo-4 shows the movable core of the TPS with the contacts of the potentiometer slider.

This sensor lasted about 12000 km. mileage of the car "VAZ-2109" equipped with the fuel injection system "JANUARY-4". The failure of the sensor is due to the lack of contact between the slider and the resistive layer. Because Initially, one of the tips broke, a scuff formed on the substrate, due to which the remaining two also broke (shown in photo 4 with a black arrow). However, since the contacts themselves are made of spring metal, the sensor worked somehow, but the substrate was subjected to significant and rapid wear. Accordingly, this faulty TPS led to the appearance of the above symptoms of a sensor malfunction. As in the first case, all problems were solved by replacing the faulty TPS with a new one (in this case, a new "GM" sensor was used).

Publication: cxem.net

See other articles Section Automobile. Electronic fuel injection

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