DTC P2138 Pedal Position Sensor 1 - 2 Voltage Correlation (4JJ3 with DPD)

1. DTC P2138 description

The accelerator pedal position sensor is installed to the accelerator pedal. The sensor consists of 2 sensors in 1 housing. Accelerator pedal position sensor 1 and accelerator pedal position sensor 2 are Hall element type sensors and each has the following circuits.

  • 5 V reference circuit
  • Low reference circuit
  • Signal circuit

The ECM supplies 5 V to the accelerator pedal position sensor via the 5 V reference circuit and grounds to the low reference circuit. The accelerator pedal position sensor sends signals related to accelerator pedal angle changes to the ECM via the signal circuit. The signal voltage of accelerator pedal position sensor 1 and accelerator pedal position sensor 2 is kept low at first and increases as the pedal is depressed. If the ECM detects that the accelerator pedal position sensor 1 signal voltage and the accelerator pedal position sensor 2 signal voltage do not correlate, the DTC is set.

2. Condition for setting DTC P2138

Condition for running the DTC

  • The battery voltage is 9 to 16 V.
  • The ignition switch is ON.
  • The accelerator pedal position sensor 1 signal voltage is 0.4 to 4.8 V.
  • The accelerator pedal position sensor 2 signal voltage is 0.4 to 4.8 V.
  • 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 accelerator pedal position sensors 1 and 2 deviate from the range by 30% or more.

3. Action taken when DTC P2138 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.
  • The ECM assumes a default accelerator pedal position sensor value.

4. Condition for clearing DTC P2138

  • 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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