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Re: TPS Sensor Location
What size engine in your Alero?
The throttle position sensor (TPS) is located on the throttle body. It is located on the opposite side of the throttle linkage. There are two Torx T20 screws that hold it on and replacement can be done DIY. The TPS has an electrical connector where you can check the reference voltage from the PCM module (approximately 5 volts) and an output feeding back to the PCM. Idle is around .4 volts and WOT is 4.0 volts. In between the voltage should be progressive from .4v to 4.0v and linear from idle to WOT.
To get a P0122 DTC error code the low voltage side is bad which means it is under a certain threshold which is well below .4 volts.
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