Throttle Position Sensor
The TP sensor is a variable mechanical resistor connected directly to throttle shaft linkage. See Fig 1 . 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 a signal return which is monitored by PCM. Voltage signal from TP sensor varies from closed throttle (0.5-1.0 volt) to wide open throttle (4.5-5.0 volts). PCM uses this signal to determine control of fuel, idle speed, spark timing and Torque Converter Clutch (TCC). A problem in TP sensor circuit may set a related DTC.