Throttle Position Sensor - good or bad? - Alfa Romeo Forum
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Throttle Position Sensor - good or bad?

Hi guys, any one knows how to distinguish a good and faulty Throttle Position Sensor?

I own a GTV 916 series 1, and the sensor is behind the throttle body. Some time ago, i experienced engine hesitation and jerking, and the Injector Warning Light lighted up. Upon checks with the Examiner, it showed errors at the Throttle Position Sensor and Idle Actuator (sitting above the throttle body). I bought myself a new OEM Throttle Position Sensor, clean the Idle Actuator and erase the errors using Examiner. I reset the ECU by removing -ve battery lead as well. Problem still exist.

I borrowed another Throttle Position Sensor from another GTV and yet it worked for a few days with no problem. Curious, I measured the resistance of each and every one of the 3 sensors and the results as follow:

(i) Mine: 0.89 - 2.71k-Ohm
(ii) Brand-new OEM unit: 0.89 - 2.54k-Ohm
(iii) Friend's: 0.92 - 2.86k-Ohm

How to do the measurement?
Black-lead of multimeter to pin #3
Red-lead of multimeter to pin #2
flip the sensor over, turn the centre socket to the left-end (max reading), turn the socket to the right-end (min reading)

This sensor is basically a potentiometer. the ECU senses the readings and interpret it into the positions/opening of the throttle plate and control the fueling accordingly. I am not a technical expert but in a nutshell, i think this is how it works.

Any one has any similar experiences to share? Does the difference in readings of each sensor affects the ECU and engine?? Thanks.
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