DTC P2135: TP Sensor Correlation: Description
WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The Throttle Actuator Control (TAC) module contains 2 throttle position sensors with a common 5-volt supply, a common ground, and 2 independent signal circuits that vary resistance according to changes in throttle plate position. The ECM measures the signal voltage from each TP sensor, which is a reduced value of the ECM 5-volt reference. As the throttle plate opens from 0 percent throttle to wide open throttle, the voltage on TP sensor 1 signal increases from 0.40-0.60 volt to 4.15-4.35 volts, while the voltage on the TP sensor 2 signal decreases from 4.35-4.55 volts to 0.60-0.80 volt. DTC P2135 will set if TP sensor 1 and TP sensor 2 signals are out of correlation with each other.