Throttle Position (TP) Sensor

TP sensor is a variable mechanical resistor connected directly to throttle shaft linkage. TP sensor has 3 wires connected to it. One is connected to a 5-volt reference voltage supply from PCM, another is connected to PCM ground and third is signal return which is monitored by PCM. Voltage signal from TP varies from closed throttle (0.5-1.0 volt) to wide open throttle (4.5-5 volts). PCM uses this signal to determine control of fuel, idle speed, spark timing and converter clutch. A problem in TP sensor circuit may set a related trouble code.