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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (2GR-FKS) - Diagnostic Codes (2 Of 6) >> SFI System >> DTC P0120-1C: Throttle / Pedal Position Sensor / Switch "A" Circuit Voltage Out of Range [12/2019 - 10/2022] >> Procedure

DTC P0120-1C: Throttle / Pedal Position Sensor / Switch "A" Circuit Voltage Out of Range [12/2019 - 10/2022]: Procedure

  1. CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM) 
    1. Disconnect the throttle body with motor 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
      C26-5 (VC) - C54-121 (VCTA) Always Below 1 Ω
      C26-6 (VTA) - C54-122 (VTA1) Always Below 1 Ω
      C26-4 (VTA2) - C54-89 (VTA2) Always Below 1 Ω
      C26-3 (E2) - C54-120 (ETA) Always Below 1 Ω
      C26-5 (VC) or C54-121 (VCTA) - Body ground and other terminals Always 10 kΩ or higher
      C26-6 (VTA) or C54-122 (VTA1) - Body ground and other terminals Always 10 kΩ or higher
      C26-4 (VTA2) or C54-89 (VTA2) - Body ground and other terminals Always 10 kΩ or higher
    4. Inspect the condition of the terminals of the connectors.

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [12/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    See step  5

    Result: 

    NG 

    See step  2

  2. REPAIR OR REPLACE HARNESS OR CONNECTOR 
    1. Repair or replace the wire harness or connector.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  3

  3. CLEAR DTC 
    1. Clear the DTCs.

      Powertrain > Engine > Clear DTCs 

    2. Turn the ignition switch off and wait for at least 30 seconds.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P0120-1C) 
    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    2. Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      DTC P0120-1C is output B

    Result: 

    A 

    END 

    Result: 

    B 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (RESISTANCE OF ECM) 
    1. Disconnect the throttle body with motor assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C26-5 (VC) - C26-6 (VTA) Ignition switch off 190 to 210 kΩ
      C26-5 (VC) - C26-4 (VTA2) Ignition switch off 190 to 210 kΩ

      HINT: 

      Perform "Inspection After Repair" after replacing the throttle body with motor assembly.

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

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022] 

    Result: 

    NG 

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

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