P2127
DTC P2127
CIRCUIT DESCRIPTION
The accelerator pedal position (APP) sensors 1 and 2 are located within the accelerator pedal assembly. Each sensor has the following circuits:
- A 5-Volt reference circuit
- A low reference circuit
- A signal circuit
This provides the engine control module (ECM) with a signal voltage proportional to accelerator pedal movement. The APP sensor 2 signal voltage at the rest position is near the low reference and increases as the pedal is actuated. If the ECM detects that the signal voltage is less than 0.1465 volts, DTC P2127 will set.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P2127 Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage
CONDITIONS FOR RUNNING THE DTC
- The ignition is ON.
- DTC P2127 runs continuously once the above condition is met.
CONDITIONS FOR SETTING THE DTC
The APP sensor 2 voltage is less than 0.1465 volts for more than 300 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.
- A message center or an indicator displays Reduced Engine Power.
- Under certain conditions the control module commands the engine OFF.
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
