DTC P0120: TP Sensor Circuit: Description

The Throttle Position (TP) sensor 1 is a potentiometer type sensor with 3 circuits:

• A 5-volt reference circuit.
• A low reference circuit.
• A signal circuit.

The TP sensor is used to determine the throttle plate angle for various engine management systems. The control module provides the TP sensor a 5-volt reference circuit and a low reference circuit. The TP sensor then provides the control module a signal and increases as the throttle opens. When the control module detects that the TP sensor 1 signal or TP sensor 5-volt reference voltage is outside the predetermined range, this DTC sets.