P0123
CIRCUIT DESCRIPTIONSchematic:
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 excessively high TP sensor signal, DTC P0123 will set.
CONDITIONS FOR RUNNING THE DTC
^ The engine is running.
^ AC valve position is between 10-110 counts.
CONDITIONS FOR SETTING THE DTC
^ The TP sensor signal voltage is more than 4.8 volts.
^ The condition exists for less than 1 second.
ACTION TAKEN WHEN THE DTC SETS
^ The PCM illuminates the Malfunction Indicator Lamp (MIL) during the second consecutive trip in which the diagnostic test runs and fails.
^ The PCM stores 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
NOTE: Refer to Connector Test Adapter Kit J 35616-A Notice in Service Precautions.
If the condition is intermittent, refer to DTC P1121 Throttle Position (TP) Sensor Circuit Intermittent High Voltage and/or Intermittent Conditions in Symptoms. P1121 Intermittent Conditions
TEST DESCRIPTION
