The Throttle Position (TP) sensor is a potentiometer which gives a signal to the PCM based on the throttle plate position, and is installed on the throttle body and attached to the throttle plate shaft. It measures the throttle plate motion and sends an electrical signal to the PCM which modulates air/fuel mixture, the timing of ignition spark, and EGR activity according to the engine load. To test Navajo models, disconnect the negative battery cable and the wiring harness on the TP sensor and with a Digital Volt-Ohmmeter (DVOM) probe designated points on sensor to ensure a constant variation in resistance as throttle shaft is rotated. Again connect the battery, set the DVOM to voltmeter, and measure the voltage at the breakout box with connections to the PCM, when the voltage does not match the value in standard, check the circuit or replace the sensor. In Pick-up and MPV models, make sure that throttle valve is shut, unplug the wiring harness and probe TP sensor terminals. Check continuity with a feeler gauge and correct the TPS. To remove it, disconnect the battery and the wiring harness, unscrew and remove the TP sensor. Installation requires attaching the sensor to the throttle body housing, screwing, reconnecting of the wiring harness, and connecting it to the negative battery cable.