P1121

CIRCUIT DESCRIPTION
The Throttle Position (TP) sensor is used by the Powertrain Control Module (PCM) to determine the throttle plate angle for various engine management systems. The TP sensor is a potentiometer type sensor with three circuits, a 5-volt reference, a low reference, and a signal. Rotation of the TP sensor rotor from the closed throttle position to the Wide Open Throttle (WOT) position provides the PCM with a signal voltage from below 1 volt to greater than 4 volts through the TP sensor signal circuit. If the PCM detects an intermittent excessively high signal voltage, this DTC will set.

CONDITIONS FOR RUNNING THE DTC
The ignition is ON.

CONDITIONS FOR SETTING THE DTC
The TP sensor intermittently indicates a throttle position signal more than 4.9 volts.

ACTION TAKEN WHEN THE DTC SETS
^ The MIL does not turn ON.
^ A DTC is stored in memory under history DTC.
^ The Failure Records are stored.
^ The Failure Records are updated after the first failure of each ignition cycle.
^ Some type C DTCs may also cause an auxiliary service lamp to be illuminated, and/or display a message to the vehicle operator.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The history DTC will clear if the fault conditions have not been detected for 40 warm-up cycles.
^ A scan tool can be used to clear DTC information.

TEST DESCRIPTION

Steps 1-3:

Steps 4-10:

The number below refers to the step number on the diagnostic table.
7. This test will determine an intermittent faulty TP sensor utilizing the DMMs MIN MAX, 100 millisecond capture mode.