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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 224 (Engine Control System (A25A-FXS) - Diagnostic Codes (04 Of 20)) >> SFI System >> DTC P0120-15: Throttle / Pedal Position Sensor / Switch "A" Circuit Short to Battery or Open [06/2018 - 08/2020] >> Procedure

DTC P0120-15: Throttle / Pedal Position Sensor / Switch "A" Circuit Short to Battery or Open [06/2018 - 08/2020]: Procedure

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  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
      C57-1 (VTA) - C88-108 (VTA1) Always Below 1 Ω
      C57-4 (E2) - C88-110 (ETA) Always Below 1 Ω
      C57-2 (VC) or C88-109 (VCTA) - Body ground and other terminals Always 10 kΩ or higher
      C57-1 (VTA) or C88-108 (VTA1) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  2

  2. CHECK TERMINAL VOLTAGE (POWER SOURCE OF THROTTLE POSITION SENSOR) 
    GTY778642Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Throttle Body with Motor Assembly)
    1. Disconnect the throttle body with motor assembly connector.
    2. Turn the power switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      C57-2 (VC) - C57-4 (E2) Power switch on (IG) 4.5 to 5.5 V
      C57-1 (VTA) - C57-4 (E2) Power switch on (IG) 3.0 to 5.0 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE ECM. Refer to  REMOVAL [06/2018 - 08/2020] 

    Result: 

    OK 

    See step  3

  3. 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
      C57-2 (VC) - C57-1 (VTA) Power switch off 190 to 210 kΩ

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE ECM. Refer to  REMOVAL [06/2018 - 08/2020] 

    Result: 

    OK 

    See step  4

  4. READ VALUE USING TECHSTREAM (THROTTLE POSITION SENSOR NO. 1 VOLTAGE) 
    GTY778628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Throttle Body with Motor Assembly)
    1. Disconnect the throttle body with motor assembly connector.
    2. Connect the Techstream to the DLC3.
    3. Turn the power switch on (IG).
    4. Turn the Techstream on.
    5. Enter the following menus: Powertrain / Engine / Data List / Throttle Position Sensor No. 1 Voltage.

      Powertrain > Engine > Data List 

      Tester Display
      Throttle Position Sensor No. 1 Voltage
    6. According to the display on the Techstream, read the Data List.

      HINT: 

      Use the snapshot function to record the value displayed or make a note of it.

    7. Turn the power switch off.
    8. Turn the Techstream off.
    9. Connect terminals 4 (E2) and 1 (VTA) of the throttle body with motor assembly connector on the wire harness side.
      NOTE:

      If the VTA terminal voltage or the resistance between VTA and E2 is abnormal and terminals 1 (VTA) and 4 (E2) of the throttle body with motor assembly connector are connected, excessive current may flow through the circuit. In this case, do not connect the terminals.

    10. Turn the power switch on (IG).
    11. Turn the Techstream on.
    12. Enter the following menus: Powertrain / Engine / Data List / Throttle Position Sensor No. 1 Voltage.

      Powertrain > Engine > Data List 

      Tester Display
      Throttle Position Sensor No. 1 Voltage
    13. Compare the vehicle of the Data List item Throttle Position Sensor No. 1 Voltage after the circuit is shorted to the value when the throttle body with motor assembly connector was connected.

      Result

      Result Proceed to
      Changes from higher than 4.535 V to less than 0.56 V A
      Does not change from higher than 4.535 V B

      HINT: 

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

      Refer to INITIALIZATION [06/2018 - 07/2019] , or refer to INITIALIZATION [07/2019 - 08/2020]

    Result: 

    A 

    REPLACE THROTTLE BODY WITH MOTOR ASSEMBLY. Refer to  REMOVAL [06/2018 - ] 

    Result: 

    B 

    REPLACE ECM. Refer to  REMOVAL [06/2018 - 08/2020] 

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