P0122

DTC P0122 Throttle Position Sensor (TPS) Circuit Low Voltage

DESCRIPTION

The throttle position sensor (TPS) mounts on the side of the throttle body and is connected to the throttle blade shaft. The TPS is a variable resistor (potentiometer) whose resistance changes according to the throttle blade shaft position. During acceleration, the TPS resistance decreases during deceleration, the TPS resistance increases. The TPS also includes an idle position switch. The switch is closed in the idle position. ECU applies a reference voltage to the TPS and then measures the voltage that is present on the TPS signal circuit. ECU uses the TPS signal to adjust the timing and injector pulse width. The TPS signal along with the MAP sensor signal is used by the ECU to calculate the engine load.

DTC Detection Condition:

Circuit Diagram:

Part 1:

Part 2:

Part 3:

TEST PROCEDURE