ELECTRIC PARKING BRAKE SYSTEM, Diagnostic DTC:C13A8/44

DTC Code DTC Name
C13A8/44 Tension Sensor Malfunction

DESCRIPTION

The tension sensor is built into the parking brake with bracket actuator assembly. It detects the tension value of the parking brake cable and outputs the value to the electric parking brake ECU.

DTC Code Detection Condition Trouble Area
C13A8/44

All of following conditions are met:


  1. Electric parking brake ECU is ON (power switch is ON (IG), or 15 seconds after power switch is OFF and electric parking brake switch lock control is operating)

  2. Tension sensor output value is abnormal; difference between output values of 2 tension sensors is 0.287 kN or more; or tension sensor power supply voltage is abnormal

  3. Problem occurs for approx. 1 second


  • Parking brake with bracket actuator assembly

  • Harness or connector

  • Electric parking brake ECU

WIRING DIAGRAM

A01GXA2E02

INSPECTION PROCEDURE

Note


  • If the electric parking brake ECU or parking brake with bracket actuator assembly is replaced, perform the "RESET MEMORY" and "ACQUIRE TENSION SENSOR ZERO POINT" procedures Click here.

  • Even after the power switch is turned OFF, the electric parking brake ECU may store a DTC as a result of removing a connector or fuse, as the ECU is still operating. Therefore, during inspection or replacement, turn the power switch OFF and wait for 20 seconds before removing the following: 1) connectors of the electric parking brake ECU, and 2) fuses of the electric parking brake system circuit.

  • This DTC may be output if a manual release cable is used. There is no malfunction. Perform the "RESET MEMORY" and "ACQUIRE TENSION SENSOR ZERO POINT" procedures Click here.

PROCEDURE


  1. CLEAR DTC


    1. Turn the power switch OFF.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch ON (IG) and the tester ON.

    4. Clear the DTC Click here.


    NEXT
  2. CHECK DTC


    1. Turn the power switch OFF.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch ON (IG) and the tester ON.

    4. Check for DTC Click here.

      Result
      Result Proceed to
      DTC is output A
      DTC is not output B

    B
    A
  3. CHECK HARNESS AND CONNECTOR (ECU - ACTUATOR)


    1. Disconnect the S48 ECU connector.

    2. Disconnect the S32 actuator connector.

    3. A01H0SDE04

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S48-8 (TSEN) - S32-5 (TSEN) Always Below 1 Ω
      S48-8 (TSEN) - Body ground Always 10 kΩ or higher
      S48-6 (TSN2) - S32-10 (TSN2) Always Below 1 Ω
      S48-6 (TSN2) - Body ground Always 10 kΩ or higher
      S48-7 (VT) - S32-6 (VT) Always Below 1 Ω
      S48-7 (VT) - Body ground Always 10 kΩ or higher
      S48-14 (TGND) - S32-1 (TGND) Always Below 1 Ω
      S48-14 (TGND) - Body ground Always 10 kΩ or higher
      S48-10 (SG) - S32-2 (SG) Always Below 1 Ω
      S48-10 (SG) - Body ground Always 10 kΩ or higher

    NG
    OK
  4. CHECK ELECTRIC PARKING BRAKE ECU (VT VOLTAGE)


    1. A01H0Z7E06

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      S48-7 (VT) - S48-14 (TGND) Power switch ON (IG) 4.75 to 5.25 V
      Result
      Result Proceed to
      Outside of the specified condition A
      Within the specified condition B

    B
    A
  5. CHECK ELECTRIC PARKING BRAKE ECU (VT VOLTAGE)


    1. Disconnect the S32 actuator connector.

    2. A01GZCXE05

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

      Standard voltage
      Tester Connection Condition Specified Condition
      S32-6 (VT) - S32-1 (TGND) Power switch ON (IG) 4.75 to 5.25 V

    NG
    OK
  6. CHECK ELECTRIC PARKING BRAKE ECU (TSEN, TSN2, TGND)


    1. Connect the S48 ECU connector.

    2. Connect the S32 actuator connector.

    3. A01H0Z7E08

      Measure the voltage between the terminals below.

      Measurement condition
      Tester Connection Switch Condition
      (A) S48-6 (TSN2) - S48-14 (TGND) Power switch ON (IG)
      (B) S48-8 (TSEN) - S48-14 (TGND) Power switch ON (IG)

      Tech Tips

      Take a note of the measurements.

    4. Turn the power switch OFF.

    5. Connect the intelligent tester to the DLC3.

    6. Turn the power switch ON (IG) and the tester ON.

    7. Enter the following menus: Chassis / Electric Parking Brake / Data List.

    8. Check the values by referring to the table below.

      Tech Tips

      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 Normal Condition Diagnostic Note
      (1) Tension1 Voltage

      Tension sensor 1 voltage display/

      min.: 0.000 V

      max.: 5.000 V

      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

      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

      Enable -
      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

    B
    A
  7. INSPECT ELECTRIC PARKING BRAKE ECU


    1. Remove the electric parking brake ECU Click here.

    2. A01GYF6E02

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

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

    NG
    OK
  8. CHECK ELECTRIC PARKING BRAKE ECU (DATA LIST)


    1. Turn the power switch OFF.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch ON (IG) and the tester ON.

    4. Enter the following menus: Chassis / Electric Parking Brake / Data List.

    5. Check the values by referring to the table below.

      Electric Parking Brake
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      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 -
      +B Voltage Value

      +B power source information display/

      Lo / Mid / Hi

      Hi -
      OK
      Values are as shown in normal condition.

    NG
    OK