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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 111 (Electronically Controlled Brake System (Hybrid) - Diagnostic Codes (5 Of 5) & Symptom Tests) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model) >> Abnormal Noise is Heard from the Engine Compartment when Depressing the Brake Pedal [06/2018 - ] >> Procedure

Abnormal Noise is Heard from the Engine Compartment when Depressing the Brake Pedal [06/2018 - ]: Procedure

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  1. CHECK DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [06/2018 - ]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

    2. Turn the power switch off.
    3. Turn the power switch on (IG).
    4. Check the DTCs that are output.

      Refer to DTC CHECK / CLEAR [06/2018 - ]

      Chassis > ABS/VSC/TRAC > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output. A
      DTCs are output. B

    Result: 

    B 

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS. Refer to  DIAGNOSTIC TROUBLE CODE CHART [06/2018 - 07/2019]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [07/2019 - 08/2020]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2020 - 08/2021]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2021 - ] 

    Result: 

    A 

    See step  2

  2. PERFORM AIR BLEEDING 
    1. Perform the air bleeding procedure in Bleed Brake System.

      Refer to BLEEDING [06/2018 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  3

  3. RECHECK SYMPTOM 
    1. Depress the brake pedal and check if the symptom disappeared.

      Result

      Result Proceed to
      The symptom disappeared (abnormal sound does not occur). A
      The symptom does not disappear (abnormal sound occurs). B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  4

  4. CLEAR DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [06/2018 - ]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    END 

  5. PERFORM FORCED ACTUATOR REFRESH 
    1. Check that the following conditions required to perform "forced actuator refresh" are met and perform "forced actuator refresh" using the Techstream.
      1. The shift state indicator shows that the shift lever is in P.
      2. The parking brake is applied.
      3. Vehicle speed is 0 km/h (0 mph).
      4. The brake pedal is not depressed.
      5. The READY light in the combination meter assembly is illuminated (or the power switch is on (IG) while the auxiliary battery is being backed up with a power supply).

      Chassis > ABS/VSC/TRAC > Utility 

      Tester Display
      Forced Actuator Refresh
      NOTE:

      As brake fluid pressure is being generated while performing "forced actuator refresh", do not depress the brake pedal or perform a brake system related procedure.

      HINT: 

      While performing "forced actuator refresh", the accumulator pressure may decrease and the meter buzzer may sound.

    2. After "forced actuator refresh" has completed, check the time taken to perform the "forced actuator refresh" displayed on the Techstream.

      OK

      The time taken to perform "forced actuator refresh" is 10 minutes and 50 seconds or more.

      Result

      Proceed to
      OK
      NG
      NOTE:

      If the time taken to perform "forced actuator refresh" is less than 10 minutes and 50 seconds, "forced actuator refresh" may have canceled without completing properly. In this case, check the conditions required to perform "forced actuator refresh" are met and perform "forced actuator refresh" again.

    Result: 

    NG 

    PERFORM FORCED ACTUATOR REFRESH AGAIN 

    Result: 

    OK 

    See step  6

  6. RECHECK SYMPTOM 
    1. Depress the brake pedal and check if the symptom disappeared.

      Result

      Result Proceed to
      The symptom disappeared (abnormal sound does not occur). A
      The symptom does not disappear (abnormal sound occurs). B

    Result: 

    B 

    See step  8

    Result: 

    A 

    See step  7

  7. CLEAR DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [06/2018 - ]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

      HINT: 

      As DTC C1256 (Accumulator Low Pressure) may be stored by performing "forced actuator refresh", clear the DTCs after performing "forced actuator refresh".

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    END 

  8. PERFORM FORCED ACTUATOR REFRESH 
    1. Check that the following conditions required to perform "forced actuator refresh" are met and perform "forced actuator refresh" using the Techstream.
      1. The shift state indicator shows that the shift lever is in P.
      2. The parking brake is applied.
      3. Vehicle speed is 0 km/h (0 mph).
      4. The brake pedal is not depressed.
      5. The READY light in the combination meter assembly is illuminated (or the power switch is on (IG) while the auxiliary battery is being backed up with a power supply).

      Chassis > ABS/VSC/TRAC > Utility 

      Tester Display
      Forced Actuator Refresh
      NOTE:

      As brake fluid pressure is being generated while performing "forced actuator refresh", do not depress the brake pedal or perform a brake system related procedure.

      HINT: 

      While performing "forced actuator refresh", the accumulator pressure may decrease and the meter buzzer may sound.

    2. After "forced actuator refresh" has completed, check the time taken to perform the "forced actuator refresh" displayed on the Techstream.

      OK

      The time taken to perform "forced actuator refresh" is 10 minutes and 50 seconds or more.

      Result

      Proceed to
      OK
      NG
      NOTE:

      If the time taken to perform "forced actuator refresh" is less than 10 minutes and 50 seconds, "forced actuator refresh" may have canceled without completing properly. In this case, check the conditions required to perform "forced actuator refresh" are met and perform "forced actuator refresh" again.

    Result: 

    NG 

    PERFORM FORCED ACTUATOR REFRESH AGAIN 

    Result: 

    OK 

    See step  9

  9. RECHECK SYMPTOM 
    1. Depress the brake pedal and check if the symptom disappeared.

      Result

      Result Proceed to
      The symptom disappeared (abnormal sound does not occur). A
      The symptom does not disappear (abnormal sound occurs). B

    Result: 

    B 

    See step  11

    Result: 

    A 

    See step  10

  10. CLEAR DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [06/2018 - ]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

      HINT: 

      As DTC C1256 (Accumulator Low Pressure) may be stored by performing "forced actuator refresh", clear the DTCs after performing "forced actuator refresh".

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    END 

  11. PERFORM FORCED ACTUATOR REFRESH 
    1. Check that the following conditions required to perform "forced actuator refresh" are met and perform "forced actuator refresh" using the Techstream.
      1. The shift state indicator shows that the shift lever is in P.
      2. The parking brake is applied.
      3. Vehicle speed is 0 km/h (0 mph).
      4. The brake pedal is not depressed.
      5. The READY light in the combination meter assembly is illuminated (or the power switch is on (IG) while the auxiliary battery is being backed up with a power supply).

      Chassis > ABS/VSC/TRAC > Utility 

      Tester Display
      Forced Actuator Refresh
      NOTE:

      As brake fluid pressure is being generated while performing "forced actuator refresh", do not depress the brake pedal or perform a brake system related procedure.

      HINT: 

      While performing "forced actuator refresh", the accumulator pressure may decrease and the meter buzzer may sound.

    2. After "forced actuator refresh" has completed, check the time taken to perform the "forced actuator refresh" displayed on the Techstream.

      OK

      The time taken to perform "forced actuator refresh" is 10 minutes and 50 seconds or more.

      Result

      Proceed to
      OK
      NG
      NOTE:

      If the time taken to perform "forced actuator refresh" is less than 10 minutes and 50 seconds, "forced actuator refresh" may have canceled without completing properly. In this case, check the conditions required to perform "forced actuator refresh" are met and perform "forced actuator refresh" again.

    Result: 

    NG 

    PERFORM FORCED ACTUATOR REFRESH AGAIN 

    Result: 

    OK 

    See step  12

  12. RECHECK SYMPTOM 
    1. Depress the brake pedal and check if the symptom disappeared.

      Result

      Result Proceed to
      The symptom disappeared (abnormal sound does not occur). A
      The symptom does not disappear (abnormal sound occurs). B

      HINT: 

      If the symptom does not disappear even after "forced actuator refresh" has completed properly 3 times, replace the brake booster with master cylinder assembly.

    Result: 

    B 

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    A 

    See step  13

  13. CLEAR DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [06/2018 - ]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

      HINT: 

      As DTC C1256 (Accumulator Low Pressure) may be stored by performing "forced actuator refresh", clear the DTCs after performing "forced actuator refresh".

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    END 

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