Circuit Description

The throttle position (TP) sensor 1 and the TP sensor 2 are potentiometer type sensors. Both sensor types have the following circuits:

• A 5-volt reference circuit
• A low reference circuit
• A signal circuit

The TP sensor provides the engine control module (ECM) with a signal voltage proportional to the throttle plate movement. The TP sensor 1 signal voltage at closed throttle is near the 5-volt reference and decreases as the throttle plate is opened. The TP sensor 2 signal voltage at closed throttle is near the low reference and increases as the throttle plate is opened. When the control module detects that the TP sensor 1 and the TP sensor 2 signal circuits are out of correlation with each other, DTC P2135 will set.