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Home >> Lexus >> 2022 >> LS 500h AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/O Advanced Park) - Diagnostic Codes (1 Of 3) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Advanced Park) >> DTC C1247: Stroke Sensor; DTC C1392: Zero Point Calibration of Stroke Sensor undone [10/2020 - 10/2023] >> Procedure

DTC C1247: Stroke Sensor; DTC C1392: Zero Point Calibration of Stroke Sensor undone [10/2020 - 10/2023]: Procedure

  1. CHECK BRAKE PEDAL 
    1. Check that the brake pedal and the brake pedal stroke sensor assembly are properly installed and that the pedal can be depressed normally.
    2. Check and adjust the brake pedal height.

      Refer to PROCEDURE - Step 1

    3. Adjust the brake pedal stroke sensor assembly.

      Refer to INSTALLATION [10/2020 - 11/2021] , or refer to INSTALLATION [11/2021 - 10/2023]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - BRAKE PEDAL STROKE SENSOR ASSEMBLY) 
    1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
    2. Disconnect the A12 skid control ECU assembly connector.
    3. Disconnect the A2 brake pedal stroke sensor assembly connector.
    4. Check both the connector case and the terminal for deformation and corrosion.

      OK

      No deformation or corrosion.

    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A12-8 (SKG) - A2-1 (SKG) Always Below 1 Ω
      A12-8 (SKG) or A2-1 (SKG) - Body ground Always 10 kΩ or higher
      A12-10 (VCSK) - A2-3 (VCSK) Always Below 1 Ω
      A12-10 (VCSK) or A2-3 (VCSK) - Body ground Always 10 kΩ or higher
      A12-20 (SKS) - A2-2 (SKS1) Always Below 1 Ω
      A12-20 (SKS) or A2-2 (SKS1) - Body ground Always 10 kΩ or higher
      A12-22 (SKS2) - A2-4 (SKS2) Always Below 1 Ω
      A12-22 (SKS2) or A2-4 (SKS2) - 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. PERFORM INITIALIZATION AND CALIBRATION OF LINEAR SOLENOID VALVE 
    1. Reconnect the A12 skid control ECU assembly connector.
    2. Reconnect the A2 brake pedal stroke sensor assembly connector.
    3. Perform initialization and calibration of the linear solenoid valve.

      Refer to INITIALIZATION [10/2020 - 10/2023]

      Chassis > ABS/VSC/TRAC > Utility 

      Tester Display
      ECB Utility

      ECB: Electronically Controlled Brake System

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. RECONFIRM DTC 
    1. Turn the power switch off.
    2. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [10/2020 - 10/2023]

      Chassis > ABS/VSC/TRAC > Clear DTCs 

    3. Turn the power switch off.
    4. Turn the power switch on (READY).
    5. Perform a road test.
    6. Check if the same DTC is output.

      Refer to DTC CHECK / CLEAR [10/2020 - 10/2023]

      Chassis > ABS/VSC/TRAC > Trouble Codes 

      Result

      Result Proceed to
      DTCs C1247 and/or C1392 are output. A
      DTCs C1247 and C1392 are not output. B

    Result: 

    B 

    END 

    Result: 

    A 

    See step  5

  5. INSPECT SKID CONTROL ECU ASSEMBLY (SENSOR POWER SUPPLY OUTPUT) 
    1. Turn the power switch on (IG).
      GTY788342Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Skid Control ECU Assembly)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A12-10 (VCSK) - Body ground Power switch on (IG) 4.5 to 5.5 V
    3. Turn the power switch off.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A12-8 (SKG) - Body ground Power switch off Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

    Result: 

    OK 

    See step  6

  6. READ VALUE USING TECHSTREAM (BRAKE PEDAL STROKE SENSOR ASSEMBLY) 
    1. Mount a pedal effort gauge.
    2. Connect the Techstream to the DLC3.
    3. Turn the power switch on (IG).
    4. Select the Data List on the Techstream.

      Refer to DATA LIST / ACTIVE TEST [10/2020 - 10/2023]

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stroke Sensor Brake pedal stroke sensor assembly 1 Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.80 to 1.20 V Reading increases when brake pedal is depressed
      Stroke Sensor2 Brake pedal stroke sensor assembly 2 Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 3.80 to 4.20 V Reading decreases when brake pedal is depressed

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      Stroke Sensor
      Stroke Sensor2
    5. When depressing the brake pedal with the amount of force listed in the table below, check that the output value displayed on the Techstream is within the standard voltage.

      HINT: 

      The brake pedal must be depressed gradually.

      Standard Voltage

      Brake Effort
      N (kgf, lbf)      		 Stroke Sensor
      (Tester Display)      		 Stroke Sensor2
      (Tester Display)
      50 (5, 11.2) 1.39 to 1.79 V 3.18 to 3.58 V
      100 (10, 22.5) 1.61 to 2.01 V 2.96 to 3.36 V
      150 (15, 33.7) 1.77 to 2.17 V 2.80 to 3.20 V
      200 (20, 45.0) 1.86 to 2.26 V 2.71 to 3.11 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE BRAKE PEDAL STROKE SENSOR ASSEMBLY. Refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) 
    1. Turn the power switch off.
    2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
    3. Disconnect the A13 and A10 skid control ECU assembly connectors.
    4. Disconnect the A8 brake actuator assembly connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A10-9 (VCM) - A8-10 (VCM) Always Below 1 Ω
      A10-9 (VCM) or A8-10 (VCM) - Body ground Always 10 kΩ or higher
      A10-21 (PAC1) - A8-15 (PAC1) Always Below 1 Ω
      A10-21 (PAC1) or A8-15 (PAC1) - Body ground Always 10 kΩ or higher
      A10-30 (PMC1) - A8-13 (PMC1) Always Below 1 Ω
      A10-30 (PMC1) or A8-13 (PMC1) - Body ground Always 10 kΩ or higher
      A10-8 (E) - A8-14 (E) Always Below 1 Ω
      A10-8 (E) or A8-14 (E) - Body ground Always 10 kΩ or higher
      A10-31 (PCK1) - A8-12 (PCK1) Always Below 1 Ω
      A10-31 (PCK1) or A8-12 (PCK1) - Body ground Always 10 kΩ or higher
      A13-16 (VCM2) - A8-5 (VCM2) Always Below 1 Ω
      A13-16 (VCM2) or A8-5 (VCM2) - Body ground Always 10 kΩ or higher
      A13-28 (PMC2) - A8-8 (PMC2) Always Below 1 Ω
      A13-28 (PMC2) or A8-8 (PMC2) - Body ground Always 10 kΩ or higher
      A13-15 (E2) - A8-16 (E2) Always Below 1 Ω
      A13-15 (E2) or A8-16 (E2) - Body ground Always 10 kΩ or higher
      A13-29 (PCK2) - A8-7 (PCK2) Always Below 1 Ω
      A13-29 (PCK2) or A8-7 (PCK2) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. INSPECT SKID CONTROL ECU ASSEMBLY (SENSOR POWER SUPPLY OUTPUT) 
    1. Reconnect the A13 and A10 skid control ECU assembly connectors.
      GTY830174Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Skid Control ECU Assembly)
    2. Reconnect the A8 brake actuator assembly connector.
    3. Turn the power switch on (IG).
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A10-9 (VCM) - Body ground Power switch on (IG) 4.75 to 5.25 V
      A13-16 (VCM2) - Body ground Power switch on (IG) 4.75 to 5.25 V
    5. Turn the power switch off.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A10-8 (E) - Body ground Power switch off Below 1 Ω
      A13-15 (E2) - Body ground Power switch off Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

    Result: 

    OK 

    See step  9

  9. READ VALUE USING TECHSTREAM (MASTER CYLINDER PRESSURE SENSOR) 
    1. Mount a pedal effort gauge.
    2. Connect the Techstream to the DLC3.
    3. Turn the power switch on (IG).
    4. Select the Data List on the Techstream.

      Refer to DATA LIST / ACTIVE TEST [10/2020 - 10/2023]

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Master Cylinder Sensor Master cylinder pressure sensor 1 Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.30 to 0.70 V Reading increases when brake pedal is depressed
      Master Cylinder Sensor2 Master cylinder pressure sensor 2 Min.: 0.00 V, Max.: 5.00 V Brake pedal released: 0.30 to 0.70 V Reading increases when brake pedal is depressed
      ECB Solenoid (SMC1) Master cut solenoid (SMC1) ON or OFF ON: Solenoid on (valve closed)
      OFF: Solenoid off (valve open)      		 ECB: Electronically Controlled Brake System
      ECB Solenoid (SMC2) Master cut solenoid (SMC2) ON or OFF ON: Solenoid on (valve closed)
      OFF: Solenoid off (valve open)      		 ECB: Electronically Controlled Brake System

      Chassis > ABS/VSC/TRAC > Data List 

      Tester Display
      Master Cylinder Sensor
      Master Cylinder Sensor2
      ECB Solenoid (SMC1)
      ECB Solenoid (SMC2)

      ECB: Electronically Controlled Brake System

    5. Check the output value of the master cylinder pressure sensor as the brake pedal is depressed.

      OK

      Output voltage is proportional to pedal stroke, and there is not a large difference in output between sensor 1 and sensor 2.

      HINT: 

      • If DTCs are stored due to the brake pedal being depressed, and electronically controlled brake system control is prohibited, check the Freeze Frame Data recorded at the time the DTCs were stored.
      • If the Freeze Frame Data shows that there are no abnormalities in the output of the master cylinder pressure sensors and difference in the output between sensor 1 and sensor 2, proceed to the next step.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

    Result: 

    NG 

    REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

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