Circuit Description

The throttle position (TP) sensors 1 and 2 are potentiometer type sensors, each with the following three circuits:

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

The TP sensors are used to determine the throttle plate angle for various engine management systems. The control module provides each TP sensor a 5-volt reference circuit and a low reference circuit. The TP sensors then provide the control module with signal voltage proportional to throttle plate movement. Both TP sensor signal voltages are low at closed throttle and increase as the throttle opens. When the control module detects that TP sensor 1 signal and the TP sensor 2 signals disagree, or signal voltages are outside the predetermined range, this DTC sets.