P2122

DTC P2122

CIRCUIT DESCRIPTION




The accelerator pedal assembly contains two accelerator pedal position (APP) sensors. The APP sensors are mounted in the pedal assembly and are not serviceable. The APP sensors provide a signal voltage that changes relative to the position of the accelerator pedal. The powertrain control module (PCM) supplies a separate 5-volt reference and low reference circuit for each of the APP sensors.

The APP sensor 1 signal voltage increases as the pedal is depressed, from approximately 1.0 volt at rest to above 4 volts when fully depressed. The APP sensor 2 signal voltage increases as the pedal is depressed, from approximately 0.5 volts at rest to more than 2 volts with the accelerator pedal fully depressed.

If the PCM detects that the APP sensor 1 signal voltage is too low, this DTC sets.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC.
DTC P2122 Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage

CONDITIONS FOR RUNNING THE DTC
- The ignition is ON.
- DTC P2122 runs continuously.

CONDITIONS FOR SETTING THE DTC
The APP sensor 1 voltage is less than 0.20 volts for less than 1 second.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- 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 emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.

TEST DESCRIPTION

Steps 1-12:

Steps 13-14:

The number below refers to the step number on the diagnostic table.
5. This step tests signal and 5-volt reference circuits.
12. After replacing the PCM, a new minimum throttle position and idle speed must be established.