P1122

CIRCUIT DESCRIPTION
The Throttle Position (TP) sensor is used by the PCM in order to determine the throttle plate angle for various engine management systems. The TP sensor is a potentiometer type sensor with 3 circuits:
^ a 5-volt reference circuit
^ a low reference circuit
^ a signal 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 volt to more than 4 volts through the TP sensor signal circuit. If the PCM detects an intermittent excessively low signal voltage, this DTC will set.

CONDITIONS FOR RUNNING THE DTC
^ The ignition is ON.
^ DTCs P1635 and P1639 are not set.

CONDITIONS FOR SETTING THE DTC
The TP sensor intermittently indicates a throttle position signal of less than 0.15 volts.

ACTION TAKEN WHEN THE DTC SETS
^ The control module stores the DTC information into memory when the diagnostic runs and fails.
^ The Malfunction Indicator Lamp (MIL) will not illuminate.
^ The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records.
^ The driver information center, if equipped, may display a message.

CONDITIONS FOR CLEARING THE DTC
^ A current DTC Last Test Failed clears when the diagnostic runs and passes.
^ A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
^ Use a scan tool in order to clear the DTC.

TEST DESCRIPTION

Steps 1-3:

Steps 4-9:

The number below refers to the step number on the diagnostic table:
6. This test will determine an intermittent faulty TP sensor.