Circuit Description
WARNING: This page is about a different car, the 2006 Suzuki Verona. However, it is still accessible from the selected car via links, so may be relevant.
The throttle body assembly contains 2 Throttle Position (TP) sensors. The TP sensors are mounted to the throttle body assembly and are not serviceable. The TP sensors provide a signal voltage that changes relative to throttle plate angle. The Engine Control Module (ECM) supplies the TP sensors with a common 5 volt reference circuit, a common low reference circuit, and 2 independent signal circuits.
The TP sensors have opposite functionality. TP sensor 1 signal voltage increases from below 1 V at idle to above 4 V at Wide Open Throttle (WOT). TP sensor 2 signal voltage decreases from above 4 V at idle to below 1 V at WOT.