Electronic Throttle Body Throttle Position Sensor

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There is one reference voltage and one signal return circuit between the PCM and the electronic throttle body throttle position sensor. The reference voltage and the signal return circuits are shared with the reference voltage and signal return circuits used by the accelerator pedal position (APP) sensor. On some vehicles, there is one digital throttle position signal circuit. For all others, there are 2 analog throttle position (TP) signal circuits for redundancy. The redundant analog TP signals are required for increased monitoring reasons. The first analog TP signal (TP1) has a negative slope (increasing angle, decreasing voltage) and the second TP signal (TP2) has a positive slope (increasing angle, increasing voltage). The TP2 signal reaches a limit of approximately 4.5 volts at approximately 45 degrees of throttle angle.

For additional information on the electronic throttle body throttle position sensor, refer to Engine Control Components.