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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Electrical >> Starter >> Stop And Start System - Diagnostic Codes (1 Of 3) >> Stop And Start System >> DTC P0555-11: Brake Booster Pressure Sensor Circuit Short to Ground; DTC P0555-15: Brake Booster Pressure Sensor Circuit Short to Battery or Open [10/2022 - ] >> Procedure

DTC P0555-11: Brake Booster Pressure Sensor Circuit Short to Ground; DTC P0555-15: Brake Booster Pressure Sensor Circuit Short to Battery or Open [10/2022 - ]: Procedure

  1. CHECK VACUUM SENSOR ASSEMBLY (PB TERMINAL VOLTAGE) 
    GTY1108641Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Engine Stop and Start ECU)    		 - -
    1. Turn the ignition switch to ON.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A34-13 (PB) - A34-3 (BRE2) Ignition switch ON Higher than 0.6 V or below 4.7 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

    Result: 

    NG 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - VACUUM SENSOR ASSEMBLY) 
    1. Disconnect the engine stop and start ECU connector.
    2. Disconnect the vacuum sensor assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A34-13 (PB) - A84-2 (PBA) Always Below 1 Ω
      A34-14 (BRVC) - A84-3 (VCA) Always Below 1 Ω
      A34-3 (BRE2) - A84-1 (E2A) Always Below 1 Ω
      A34-13 (PB) - Body ground Always 10 kΩ or higher
      A34-14 (BRVC) - Body ground Always 10 kΩ or higher
      A34-3 (BRE2) - Body ground Always 10 kΩ or higher
      A84-2 (PBA) - Body ground Always 10 kΩ or higher
      A84-3 (VCA) - Body ground Always 10 kΩ or higher
      A84-1 (E2A) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. CHECK ENGINE STOP AND START ECU (BRVC TERMINAL VOLTAGE) 
    GTY1104567Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Engine Stop and Start ECU)    		 - -
    1. Turn the ignition switch to ON.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A34-14 (BRVC) - A34-3 (BRE2) Ignition switch ON 4.75 to 5.25 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

    Result: 

    OK 

    See step  4

  4. REPLACE VACUUM SENSOR ASSEMBLY 
    1. Replace the vacuum sensor assembly.

      Refer to REMOVAL [10/2022 - 11/2023] , or refer to REMOVAL [11/2023 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  5

  5. CLEAR DTC 
    1. Clear the DTCs.

      Powertrain > Stop and Start > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  6

  6. CHECK DTC OUTPUT 
    1. Check that no DTCs are output.

      Powertrain > Stop and Start > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      DTC P0555-11 or P0555-15 is output B

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

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