P2122
DTC P2122CIRCUIT DESCRIPTION
The accelerator pedal position (APP) sensor is made up of two sensors that are housed inside one assembly. The engine control module (ECM) supplies a separate 5-volt reference and the low reference circuit for each of the sensors. The 5-volt reference for APP sensor 1 is supplied from the same source in the ECM as the 5-volt reference for the mass air flow (MAF) sensor and the fuel tank pressure (FTP) sensor. The 5-volt reference voltage for all of the sensors is supplied on separate ECM terminals, but the terminals are connected internally to a voltage supply. The APP sensor 1 sends a signal from the sensor to the ECM indicating the accelerator pedal position. The ECM actuates the throttle plates based on this information. The APP sensor 1 signal voltage increases as the pedal is applied. If the ECM detects that the signal voltage is less than 0.84, DTC P2122 will set.
CONDITIONS FOR RUNNING THE DTC
- The battery voltage is more than 10 volts.
- The accelerator pedal is not in the rest position.
CONDITIONS FOR SETTING THE DTC
The APP sensor 1 voltage is less than 0.84 volt for more than 140 milliseconds.
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 and/or the Failure Records.
- The control module commands the TAC system to operate in the Reduced Engine Power mode.
OR
- Under certain conditions the control module commands the engine OFF.
- The message center displays Reduced Engine Power.
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.
DIAGNOSTIC AIDS
Use the J 35616-B Connector Test Adapter Kit for any test that requires probing the ECM harness connector or a component harness connector. For intermittent conditions, refer to Intermittent Conditions. Intermittent Conditions
TEST
