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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (2GR-FKS) - Diagnostic Codes (6 Of 6) & Circuit Tests (1 Of 2) >> SFI System >> DTC P2120-12: Throttle/Pedal Position Sensor/Switch "D" Circuit Short to Battery; DTC P2120-14: Throttle/Pedal Position Sensor/Switch "D" Circuit Short to Ground or Open; DTC P2120-1C: Throttle/Pedal Position Sensor/Switch "D" Circuit Voltage Out of Range; DTC P2120-1F: Throttle/Pedal Position Sensor/Switch "D" Circuit Intermittent; DTC P2120-99: Throttle/Pedal Position Sensor/Switch "D" Exceeded Learning Limit; DTC P2125-12: Throttle/Pedal Position Sensor/Switch "E" Circuit Short to Battery; DTC P2125-14: Throttle/Pedal Position Sensor/Switch "E" Circuit Short to Ground or Open; DTC P2125-1F: Throttle/Pedal Position Sensor/Switch "E" Circuit Intermittent; DTC P2138-2B: Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation Signal Cross Coupled [12/2019 - 10/2022] >> Procedure

DTC P2120-12: Throttle/Pedal Position Sensor/Switch "D" Circuit Short to Battery; DTC P2120-14: Throttle/Pedal Position Sensor/Switch "D" Circuit Short to Ground or Open; DTC P2120-1C: Throttle/Pedal Position Sensor/Switch "D" Circuit Voltage Out of Range; DTC P2120-1F: Throttle/Pedal Position Sensor/Switch "D" Circuit Intermittent; DTC P2120-99: Throttle/Pedal Position Sensor/Switch "D" Exceeded Learning Limit; DTC P2125-12: Throttle/Pedal Position Sensor/Switch "E" Circuit Short to Battery; DTC P2125-14: Throttle/Pedal Position Sensor/Switch "E" Circuit Short to Ground or Open; DTC P2125-1F: Throttle/Pedal Position Sensor/Switch "E" Circuit Intermittent; DTC P2138-2B: Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation Signal Cross Coupled [12/2019 - 10/2022]: Procedure

  1. READ VALUE USING GTS (ACCELERATOR PEDAL POSITION SENSOR) 
    GTY361850Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Fully Depressed
    *b Fully Released
    1. Read the value displayed on the GTS.

      Powertrain > Engine > Data List 

      Tester Display
      Accelerator Position Sensor No. 1 Voltage
      Accelerator Position Sensor No. 2 Voltage

      Standard Voltage

      Accelerator Pedal Operation Accelerator Position Sensor No. 1 Voltage Accelerator Position Sensor No. 2 Voltage Difference between Accelerator Position Sensor No. 1 Voltage and Accelerator Position Sensor No. 2 Voltage
      Fully Released 0.5 to 1.1 V 1.2 to 2.0 V More than 0.02 V
      Fully Depressed 2.6 to 4.5 V 3.4 to 4.75 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    CHECK FOR INTERMITTENT PROBLEMS 

    Refer to CHECK FOR INTERMITTENT PROBLEMS [12/2019 - 10/2022]

    Result: 

    NG 

    See step  2

  2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF ACCELERATOR PEDAL SENSOR ASSEMBLY) 
    GTY844578Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Accelerator Pedal Sensor Assembly)

    HINT: 

    Make sure that the connector is properly connected. If it is not, securely connect it and check for DTCs again.

    1. Disconnect the accelerator pedal sensor assembly connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A26-4 (VCPA) - A26-5 (EPA) Ignition switch ON 4.5 to 5.5 V
      A26-1 (VCP2) - A26-2 (EPA2) Ignition switch ON 4.5 to 5.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (RESISTANCE OF ECM) 
    GTY844579Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Accelerator Pedal Sensor Assembly)
    1. Disconnect the accelerator pedal sensor assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A26-6 (VPA) - A26-5 (EPA) Ignition switch off 37.05 to 40.95 kΩ
      A26-3 (VPA2) - A26-2 (EPA2) Ignition switch off 37.05 to 40.95 kΩ

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ACCELERATOR PEDAL (W/SENSOR) ROD ASSEMBLY 

    Refer to REMOVAL [12/2019 - 10/2022]

    Result: 

    NG 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL SENSOR ASSEMBLY - ECM) 
    1. Disconnect the accelerator pedal sensor assembly connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A26-6 (VPA) - A28-47 (VPA) Always Below 1 Ω
      A26-5 (EPA) - A28-48 (EPA) Always Below 1 Ω
      A26-3 (VPA2) - A28-50 (VPA2) Always Below 1 Ω
      A26-2 (EPA2) - A28-51 (EPA2) Always Below 1 Ω
      A26-6 (VPA) or A28-47 (VPA) - Body ground and other terminals Always 10 kΩ or higher
      A26-5 (EPA) or A28-48 (EPA) - Body ground and other terminals Always 10 kΩ or higher
      A26-3 (VPA2) or A28-50 (VPA2) - Body ground and other terminals Always 10 kΩ or higher
      A26-2 (EPA2) or A28-51 (EPA2) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM 

    Refer to REMOVAL [12/2019 - 09/2020] , or refer to REMOVAL [09/2020 - 10/2022]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL SENSOR ASSEMBLY - ECM) 
    1. Disconnect the accelerator pedal sensor assembly connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A26-4 (VCPA) - A28-49 (VCPA) Always Below 1 Ω
      A26-5 (EPA) - A28-48 (EPA) Always Below 1 Ω
      A26-1 (VCP2) - A28-52 (VCP2) Always Below 1 Ω
      A26-2 (EPA2) - A28-51 (EPA2) Always Below 1 Ω
      A26-4 (VCPA) or A28-49 (VCPA) - Body ground and other terminals Always 10 kΩ or higher
      A26-5 (EPA) or A28-48 (EPA) - Body ground and other terminals Always 10 kΩ or higher
      A26-1 (VCP2) or A28-52 (VCP2) - Body ground and other terminals Always 10 kΩ or higher
      A26-2 (EPA2) or A28-51 (EPA2) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM 

    Refer to REMOVAL [12/2019 - 09/2020] , or refer to REMOVAL [09/2020 - 10/2022]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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