P1121

CIRCUIT DESCRIPTION

Schematic:

The Throttle Position (TP) sensor is potentiometer used to indicate the amount of throttle opening. The PCM supplies the TP sensor with a 5 volt reference and a ground. The TP sensor provides a signal voltage to the PCM relative to throttle blade angle. With the throttle closed, the signal voltage is low. However, the signal voltage increases as the throttle opens. During normal operation, TP signal voltage will vary from below 1 volt at idle to above 4 volts at Wide Open Throttle (WOT). The TP signal is one of the most important sensor inputs used by the PCM for controlling fuel and most of the PCM-controlled outputs. If the PCM detects an intermittently high TP sensor signal, DTC P1121 will set.

CONDITIONS FOR RUNNING THE DTC
^ The engine is running.
^ The IAC valve position is between 10-130 counts.

CONDITIONS FOR SETTING THE DTC
^ The TP sensor signal voltage is intermittently more than 4.7 volts.
^ The condition exists for less than 1 second.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM will illuminate the Malfunction Indicator Lamp (MIL) the first time the malfunction is detected.
^ The PCM will store the conditions present when the DTC set as Freeze Frame and Fail Records data.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The PCM will turn the MIL OFF after the third consecutive trip in which the diagnostic runs and passes.
^ The History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using the scan tool Clear DTC Information function.

DIAGNOSTIC AIDS
If the condition is intermittent, refer to Intermittent Conditions in Symptoms. Intermittent Conditions

TEST DESCRIPTION

Steps 1 - 6: