2003 Saturn L300 V6-3.0L VIN R P2119-Throttle Closed Position Performance

The throttle actuator control (TAC) module contains a direct current actuator motor
controlled by the ECM used to move the throttle plate (in either direction) and two throttle
position sensors to determine throttle plate position. The throttle plate is held at a 7% rest
position to a mechanical stop by a constant force return spring. This spring will hold the
throttle plate to the stop when there is no current flowing to the actuator motor. There is
another return spring, which creates constant force on the throttle plate only when the
throttle plate is moved towards the full closed position. The ECM will monitor both the
actuator motor and TP sensors for circuit faults, as well as check to make sure both
springs can return the throttle to the 7% position no matter where the throttle plate
remains.

The ECM will go through a throttle relearn procedure 29 seconds after the ignition is
turned On with the engine Off as long as certain conditions have been met. During this
learn procedure, the ECM will move the throttle from the rest to full closed position, then
to around 14%. During this period, the TP sensors lower limits, rest position of the TP
sensors, the actuator motor force to overcome both spring pressures as well as the
return rates of both springs are learned. If any of these parameters are out of range, a
DTC will be set DTC P2119 will set if the throttle plate does not return within a certain
amount of time to the 7% idle air position during a throttle relearn procedure or during
the keyup closed throttle test indicating the throttle plate is sticking or the throttle plate
return springs have weakened.

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