Circuit Description

The Throttle Position (TP) sensor is a potentiometer mounted on side of throttle body. TP sensor voltage signal changes relative to throttle blade angle. TP sensor uses a 5-volt reference, a ground and a signal circuit. TP sensor signal voltage should be about 0.6 volt at idle and 4 volts or more at wide open throttle. PCM compares actual throttle position from TP sensor to a predicted throttle position value. The predicted value is calculated from engine speed and other inputs. If PCM detects predicted throttle position is less than actual TP sensor value, DTC will set.

For duplication of DTC, ensure no MAP or TP sensor DTCs are set, engine is running, engine coolant temperature is greater than 32°F (0°C), IAC is between 0-255 counts, MAP is less than 55 kPa or greater than 65 kPa, and MAP is steady.