I can't find a decent picture of the sensor but it appears to be part of a larger black plastic housing on the side of the throttle body assembly. There should be three wires going to it.
Ground the black meter lead to the battery negative post or a paint-free spot on the engine. Poke the red probe through the rubber weather seal on the connector. You can use a stretched-out paper clip too if necessary. What you should find is one wire reads about 0.2 volts, one reads 5.0 volts, and the middle one will read from approximately 0.5 at idle to 4.5 volts at wide-open-throttle.
If that middle signal wire always reads close to 5 volts, the ground wire is open, (broken). If it always reads near 0 volts, the 5.0 volt feed wire is open. The signal wire is a little trickier. If it is open, the voltage swing will be correct at the sensor but at the computer it is designed to be "pulled up" to 5 volts or "pulled down" to 0 volts to force the computer to detect the problem and set a code.
The easiest way to check the sensor's operation is with a scanner that displays live data. You can simply sit in the car and work the gas pedal while watching the TPS voltage. If it swings normally from 0.5 to 4.5 volts, all of the wires and sensor are okay.
I just looked up the exact fault code description:
P1122 Throttle Position (TP) Sensor Inconsistent With MAF Sensor Low Voltage
That doesn't indicate a defective sensor, ... Exactly. It means the two sensors don't agree on some engine operating condition. The MAF sensor reports incoming air by weight which is low during idle. The throttle has to be closed and the TPS reading should be near 0.5 volts. The TPS is a relatively simple mechanical device that for the most part can develop an intermittent connection between its movable contact and the carbon strip it rides on, but the MAF sensor has a bunch of electronic circuitry inside so it is more likely to develop a problem like what the fault code is describing. Either sensor can cause an intermittent problem too. The fault code should always be recorded, as you did, then for intermittent problems, it should be erased after any repairs to see if it comes back. Codes will be set by unplugging any sensor while the ignition switch is in the "run" position too so do any work in checking connector pins with the switch off.
Given the code and the history of events, you might look closer at the tube between the mass air flow sensor and the throttle body. Any gap in that tube that lets fresh air in will cause a problem. The throttle blade will be open allowing more air in, but if any air goes in that doesn't go through the MAF, the computer won't know about it and won't command sufficient fuel to go with that air. Based on the throttle position sensor's voltage reading, the computer expects to see a corresponding air flow reading from the mass air flow sensor. THAT is the discrepancy the fault code is referring to.
Thursday, March 22nd, 2012 AT 5:02 PM