DTC P2123 Pedal Position Sensor 1 Circuit High Input (4JJ3 with DPD)

1. DTC P2123 description

The accelerator pedal position sensor is installed to the accelerator pedal. The sensor consists of 2 sensors in 1 housing. The ECM uses the accelerator pedal position sensor to calculate the desired acceleration and deceleration. Accelerator pedal position sensor 1 has the following circuits.

  • 5 V reference circuit
  • Low reference circuit
  • Accelerator pedal position sensor 1 signal circuit

Accelerator pedal position sensor 1 sends signals related to accelerator pedal angle changes to the ECM via the signal circuit. If the ECM detects an excessively high signal voltage, the DTC is set.

2. Condition for setting DTC P2123

Condition for running the DTC

  • The battery voltage is 9 to 16 V.
  • The ignition switch is ON.
  • DTCs P060B and P0641 are not set.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P060B Internal Control Module A/D Processing Performance".

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC P0641 Sensor Reference Voltage 1 Circuit".

Condition for setting the DTC

  • The ECM detects that the accelerator pedal position sensor 1 signal voltage is 4.8 V or more.

3. Action taken when DTC P2123 sets

  • The ECM illuminates the MIL. Refer to Action taken when DTC sets - Type A.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC type definitions".

  • The ECM inhibits the cruise control.

4. Condition for clearing DTC P2123

  • Refer to Conditions for clearing the MIL/DTC - Type A or Type B.

Refer to "51.Engine Control 1A.Troubleshooting(4JJ3 with DPD) DTC type definitions".

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