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Home >> Lexus >> 2021 >> LC 500 2D Coupe >> Repair and Diagnosis >> Brakes >> Parking Brake System >> Electric Parking Brake System - Diagnostic Codes & Symptom Tests (Coupe) >> Electric Parking Brake System >> DTC C13A8/44: Tension Sensor Malfunction [03/2017 - 09/2018] >> Procedure

DTC C13A8/44: Tension Sensor Malfunction [03/2017 - 09/2018]: Procedure

  1. CLEAR DTC 
    1. Clear the DTC.

      Refer to DTC CHECK / CLEAR [03/2017 - 09/2018]

      Chassis > Electric Parking Brake > Clear DTCs 

    2. Turn the engine switch off.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. CHECK DTC 
    1. Turn the engine switch on (IG).
    2. Operate the electric parking brake.
    3. Check for DTC.

      Refer to DTC CHECK / CLEAR [03/2017 - 09/2018]

      Chassis > Electric Parking Brake > Trouble Codes 

      Result

      Result Proceed to
      DTC C13A8/44 is output A
      DTC C13A8/44 is not output B

    Result: 

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - 04/2020] 

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU ASSEMBLY - PARKING BRAKE WITH BRACKET ACTUATOR ASSEMBLY) 
    1. Turn the engine switch off.
    2. Disconnect the X66 and X67 parking brake ECU assembly connectors.
    3. Disconnect the X68 parking brake with bracket actuator assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      X66-3 (GND1) - Body ground Always Below 1 Ω
      X67-8 (TSEN) - X68-5 (TSEN) Always Below 1 Ω
      X67-8 (TSEN) or X68-5 (TSEN) - Body ground Always 10 kΩ or higher
      X67-6 (TSN2) - X68-10 (TSN2) Always Below 1 Ω
      X67-6 (TSN2) or X68-10 (TSN2) - Body ground Always 10 kΩ or higher
      X67-7 (VT) - X68-6 (VT) Always Below 1 Ω
      X67-7 (VT) or X68-6 (VT) - Body ground Always 10 kΩ or higher
      X67-14 (TGND) - X68-1 (TGND) Always Below 1 Ω
      X67-14 (TGND) or X68-1 (TGND) - Body ground Always 10 kΩ or higher
      X67-10 (SG) - X68-2 (SG) Always Below 1 Ω
      X67-10 (SG) or X68-2 (SG) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK PARKING BRAKE ECU ASSEMBLY (VT VOLTAGE) 
    1. Turn the engine switch off.
    2. Connect the parking brake ECU assembly connector.
    3. Connect the parking brake with bracket actuator assembly connector.
    4. Turn the engine switch on (IG).
    5. Measure the voltage according to the value(s) in the table below.
      GTY819707Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Parking Brake ECU Assembly)

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      X67-7 (VT) - X67-14 (TGND) Engine switch on (IG) 4.75 to 5.25 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  5

  5. CHECK PARKING BRAKE ECU ASSEMBLY (TSEN, TSN2 - TGND) 
    1. Measure the voltage between the terminals below.
      GTY819706Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Parking Brake ECU Assembly)
        Tester Connection Switch Condition
      (A) X67-6 (TSN2) - X67-14 (TGND) Engine switch on (IG)
      (B) X67-8 (TSEN) - X67-14 (TGND) Engine switch on (IG)

      HINT: 

      Take a note of the measurements.

    2. Turn the engine switch off.
    3. Connect the Techstream to the DLC3.
    4. Turn the engine switch on (IG) and the Techstream on.
    5. Enter the following menus: Chassis / Electric Parking Brake / Data List.
    6. Check the values by referring to the table below.

      HINT: 

      This procedure is performed to compare the difference between the actual voltage and the voltage recognized by the ECU.

      Electric Parking Brake

        Tester Display Measurement Item Range Switch Condition Normal Condition
      (1) Tension1 Voltage Tension sensor 1 voltage display min.: 0.000 V
      max.: 5.000 V      		 Engine switch on (IG) Voltage (A) +/- 0.2 V is 0.3 to 4.7 V
      (2) Tension2 Voltage Tension sensor 2 voltage display min.: 0.000 V
      max.: 5.000 V      		 Engine switch on (IG) Voltage (B) +/- 0.2 V is 0.3 to 4.7 V
      (3) Invalid Tension Sensor Comp Tension sensor comparison invalid display Enable or Disable Engine switch on (IG) Enable

      Chassis > Electric Parking Brake > Data List 

      Tester Display
      Tension1 Voltage
      Tension2 Voltage
      Invalid Tension Sensor Comp

      OK

      Values are as shown in normal condition.

      Result

      Result Proceed to
      (1), (2) or (3) are NG A
      (1), (2) and (3) are OK B

    Result: 

    B 

    See step  8

    Result: 

    A 

    See step  6

  6. INSPECT PARKING BRAKE ECU ASSEMBLY 
    1. Turn the engine switch off.
    2. Remove the parking brake ECU assembly.

      Refer to REMOVAL [03/2017 - 05/2023]

    3. Measure the resistance according to the value(s) in the table below.
      GTY792208Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Parking Brake ECU Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      X67-8 (TSEN) - X66-3 (GND1) Always 4 to 6 kΩ
      X67-6 (TSN2) - X66-3 (GND1) Always 4 to 6 kΩ
      X67-14 (TGND) - X66-3 (GND1) Always Below 1 Ω
      X67-10 (SG) - X66-3 (GND1) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE PARKING BRAKE WITH BRACKET ACTUATOR ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    NG 

    REPLACE PARKING BRAKE ECU ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023] 

  7. CHECK PARKING BRAKE ECU ASSEMBLY (VT VOLTAGE) 
    1. Turn the engine switch off.
    2. Disconnect the parking brake with bracket actuator assembly connector.
    3. Turn the engine switch on (IG).
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      X68-6 (VT) - X68-1 (TGND) Engine switch on (IG) 4.75 to 5.25 V
      GTY838665Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Parking Brake with Bracket Actuator Assembly)

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE PARKING BRAKE WITH BRACKET ACTUATOR ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    NG 

    REPLACE PARKING BRAKE ECU ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023] 

  8. READ VALUE USING TECHSTREAM (DATA LIST) 
    1. Turn the engine switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the engine switch on (IG) and the Techstream on.
    4. Enter the following menus: Chassis / Electric Parking Brake / Data List.
    5. Check the values by referring to the table below.

      Chassis > Electric Parking Brake > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      +B Voltage Value Electric parking brake motor power source information display Lo, Mid or Hi Hi -
      Invalid Tension Sensor Output Tension sensor output invalid display Enable or Disable Enable -
      Invalid Tension Sensor PWR Tension sensor power source invalid display Enable or Disable Enable -
      Invalid Tension Sensor Comp Tension sensor comparison invalid display Enable or Disable Enable -

      Chassis > Electric Parking Brake > Data List 

      Tester Display
      +B Voltage Value
      Invalid Tension Sensor Output
      Invalid Tension Sensor PWR
      Invalid Tension Sensor Comp

      OK

      Values are as shown in normal condition.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - 04/2020] 

    Result: 

    NG 

    REPLACE PARKING BRAKE ECU ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023] 

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