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.

DTC will set when following conditions are present:

• No MAP sensor DTCs set and no other TP sensor DTCs set.
• MAP less than 60 kPa.
• TP steady.
• Predicted throttle angle is less than actual throttle angle.
• Conditions met for 38 seconds.