P0122

CIRCUIT DESCRIPTION
The Throttle Position (TP) sensor is used by the PCM to determine the throttle plate angle for various engine management systems. The TP sensor is a potentiometer type sensor with three circuits; 5 volt reference, low reference, and signal. The PCM provides the TP sensor with a 5 volt reference circuit and a low reference circuit. 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 less than 1.0 volt to greater than 4.0 volts through the TP sensor signal circuit. If the PCM detects an excessively low signal voltage, this DTC will set.

CONDITIONS FOR RUNNING THE DTC
Ignition is ON.

CONDITIONS FOR SETTING THE DTC
^ TP sensor signal voltage is less than 0.16 volts.
^ The above condition is present for longer than 1 second.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM will illuminate the Malfunction Indicator Lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed.
^ The PCM will store conditions which were present when the DTC set as Freeze Frame/Failure Records data.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The PCM will turn OFF the Malfunction Indicator Lamp (MIL) during the third consecutive trip in which the diagnostic has run and passed.
^ The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using a scan tool.

TEST DESCRIPTION

Steps 1-5:

Steps 6-15:

The number below refers to the step number on the diagnostic table.
8. Malfunctioning components that share the TP sensor 5 volt reference circuit could cause a low voltage condition on this circuit.