Throttle Position Sensor (TPS)

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