ELECTRIC PARKING BRAKE SYSTEM, Diagnostic DTC:C13A8

DTC Code DTC Name
C13A8 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 parking brake ECU assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory Note
C13A8 Tension Sensor Malfunction

Detection Condition 1:


  • Diagnosis Condition:

    Electric parking brake switch assembly is operated to lock side with power switch off or power switch is turned on (IG)

  • Malfunction Status:

    Tension1 Voltage or Tension2 Voltage voltage is 4.5 V or more

  • Malfunction Duration:

    Approximately 1 second

Detection Condition 2:


  • Diagnosis Condition:

    After performing tension sensor zero point calibration, electric parking brake switch assembly is operated to lock side with power switch off or power switch is turned on (IG)

  • Malfunction Status:

    Tension1 Voltage or Tension2 Voltage voltage is below 0.463 V

  • Malfunction Duration:

    Approximately 1 second

Detection Condition 3:


  • Diagnosis Condition:

    When performing tension sensor zero point calibration or power switch is turned on (IG) with parking brake forcibly released

  • Malfunction Status:

    Tension1 Voltage or Tension2 Voltage voltage is below 0.2 V

  • Malfunction Duration:

    Approximately 1 second

Detection Condition 4:


  • Diagnosis Condition:

    Electric parking brake switch assembly is operated to lock side with power switch off or power switch is turned on (IG)

  • Malfunction Status:

    The voltage of the tension sensor 1 zero point correction value or tension sensor 2 zero point correction value is abnormal

  • Malfunction Duration:

    The malfunction status repeats 3 times

  • Parking brake with bracket actuator assembly

  • Wire harness or connector

  • Parking brake ECU assembly

 Yes An electric parking brake system malfunction is displayed on the multi-information display.
DTC Detection Condition Combination Table: C13A8 (Pattern 1, Pattern 2, Pattern 3, Pattern 4, Pattern 5, Pattern 6)
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3 Pattern 4 Pattern 5 Pattern 6
Diagnosis Condition Electric parking brake switch assembly is operated to lock side with power switch off ○ ○ - - ○ ○
Power switch on (IG) - - ○ ○ - -
After performing tension sensor zero point calibration - - - - ○ ○
Malfunction Status Tension1 Voltage voltage is 4.5 V or more ○ - ○ - - -
Tension2 Voltage voltage is 4.5 V or more - ○ - ○ - -
Tension1 Voltage voltage is below 0.463 V - - - - ○ -
Tension2 Voltage voltage is below 0.463 V - - - - - ○
Detection Time Approximately 1 second Approximately 1 second Approximately 1 second Approximately 1 second Approximately 1 second Approximately 1 second
Trip Count 1 trip 1 trip 1 trip 1 trip 1 trip 1 trip
DTC Detection Condition Combination Table: C13A8 (Pattern 7, Pattern 8, Pattern 9, Pattern 10, Pattern 11)
Vehicle Condition
Pattern 7 Pattern 8 Pattern 9 Pattern 10 Pattern 11
Diagnosis Condition Power switch on (IG) ○ ○ - - ○
Tension sensor zero point calibration incomplete - - ○ ○ -
Parking brake is forcibly released - - - - ○
Malfunction Status Tension1 Voltage voltage is below 0.463 V ○ - - - -
Tension2 Voltage voltage is below 0.463 V - ○ - - -
Tension1 Voltage voltage is below 0.2 V - - ○ - ○
Tension2 Voltage voltage is below 0.2 V - - - ○ -
Detection Time Approximately 1 second Approximately 1 second Approximately 1 second Approximately 1 second Approximately 1 second
Trip Count 1 trip 1 trip 1 trip 1 trip 1 trip
DTC Detection Condition Combination Table: C13A8 (Pattern 12, Pattern 13, Pattern 14, Pattern 15, Pattern 16)
Vehicle Condition
Pattern 12 Pattern 13 Pattern 14 Pattern 15 Pattern 16
Diagnosis Condition Electric parking brake switch assembly is operated to lock side with power switch off - ○ ○ - -
Power switch on (IG) ○ - - ○ ○
Parking brake is forcibly released ○ - - - -
Malfunction Status Tension2 Voltage voltage is below 0.2 V ○ - - - -
The voltage of the tension sensor 1 zero point correction value is abnormal - ○ - ○ -
The voltage of the tension sensor 2 zero point correction value is abnormal - - ○ - ○
Detection Time Approximately 1 second Repeats 3 times Repeats 3 times Repeats 3 times Repeats 3 times
Trip Count 1 trip 1 trip 1 trip 1 trip 1 trip

Tech Tips

If the conditions match either of these patterns, a DTC will be output.

WIRING DIAGRAM

B004XL5E03

CAUTION / NOTICE / HINT

Note


  • This DTC may be stored when the parking brake is forcibly released, but this is not a malfunction.

  • The electric parking brake may still operate up to 20 seconds after the power switch is turned off. Before disconnecting connectors or fuses, turn the power switch off and wait 20 seconds or more.

  • Cable tension may fall below the prescribed value and C13A8 may be stored when the parking brake is forcibly released, but this is not a malfunction.

  • If the parking brake ECU assembly or parking brake with bracket actuator assembly is replaced, perform the "Reset Memory" and "Acquire Tension Sensor Zero Point" procedures.

    Click here

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTC.

      Click here


      Chassis > Electric Parking Brake > Clear DTCs

    2. Turn the power switch off.

      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK DTC


    1. Turn the power switch on (IG).

    2. Operate the electric parking brake.

    3. Check for DTC.

      Click here


      Chassis > Electric Parking Brake > Trouble Codes
      Result
      Result Proceed to
      DTC C13A8 is output A
      DTC C13A8 is not output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU ASSEMBLY - PARKING BRAKE WITH BRACKET ACTUATOR ASSEMBLY)


    1. Turn the power switch off.

    2. Disconnect the L76 and L77 parking brake ECU assembly connectors.

    3. Disconnect the L78 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
      L76-3 (GND1) - Body ground Always Below 1 Ω
      L77-8 (TSEN) - L78-5 (TSEN) Always Below 1 Ω
      L77-8 (TSEN) or L78-5 (TSEN) - Body ground Always 10 kΩ or higher
      L77-6 (TSN2) - L78-10 (TSN2) Always Below 1 Ω
      L77-6 (TSN2) or L78-10 (TSN2) - Body ground Always 10 kΩ or higher
      L77-7 (VT) - L78-6 (VT) Always Below 1 Ω
      L77-7 (VT) or L78-6 (VT) - Body ground Always 10 kΩ or higher
      L77-14 (TGND) - L78-1 (TGND) Always Below 1 Ω
      L77-14 (TGND) or L78-1 (TGND) - Body ground Always 10 kΩ or higher
      L77-10 (SG) - L78-2 (SG) Always Below 1 Ω
      L77-10 (SG) or L78-2 (SG) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK PARKING BRAKE ECU ASSEMBLY (VT VOLTAGE)


    1. Turn the power switch off.

    2. Connect the parking brake ECU assembly connector.

    3. Connect the parking brake with bracket actuator assembly connector.

    4. Turn the power switch on (IG).

    5. B004URQC16
      *a

      Component with harness connected

      (Parking Brake ECU Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      L77-7 (VT) - L77-14 (TGND) Power switch on (IG) 4.75 to 5.25 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK PARKING BRAKE ECU ASSEMBLY (VT VOLTAGE) Click here

    OK

  5. CHECK PARKING BRAKE ECU ASSEMBLY (TSEN, TSN2 - TGND)


    1. B004URQC17
      *a

      Component with harness connected

      (Parking Brake ECU Assembly)

      Measure the voltage between the terminals below.

      Tester Connection Switch Condition
      (A) L77-6 (TSN2) - L77-14 (TGND) Power switch on (IG)
      (B) L77-8 (TSEN) - L77-14 (TGND) Power switch on (IG)

      Tech Tips

      Take a note of the measurements.

    2. Turn the power switch off.

    3. Connect the GTS to the DLC3.

    4. Turn the power switch on (IG) and the GTS on.

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

    6. 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 Switch Condition Normal Condition
      (1) Tension1 Voltage Tension sensor 1 voltage display

      min.: 0.000 V

      max.: 5.000 V

      		 Power 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

      		 Power 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 Power 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

    B

    READ VALUE USING GTS (DATA LIST) Click here

    A

  6. INSPECT PARKING BRAKE ECU ASSEMBLY


    1. Turn the power switch off.

    2. Remove the parking brake ECU assembly.

      Click here

    3. B004VX1C11
      *a

      Component without harness connected

      (Parking Brake ECU Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L77-8 (TSEN) - L76-3 (GND1) Always 4 to 6 kΩ
      L77-6 (TSN2) - L76-3 (GND1) Always 4 to 6 kΩ
      L77-14 (TGND) - L76-3 (GND1) Always Below 1 Ω
      L77-10 (SG) - L76-3 (GND1) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE PARKING BRAKE WITH BRACKET ACTUATOR ASSEMBLY Click here

    NG

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

  7. CHECK PARKING BRAKE ECU ASSEMBLY (VT VOLTAGE)


    1. Turn the power switch off.

    2. Disconnect the parking brake with bracket 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 Switch Condition Specified Condition
      L78-6 (VT) - L78-1 (TGND) Power switch on (IG) 4.75 to 5.25 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE PARKING BRAKE WITH BRACKET ACTUATOR ASSEMBLY Click here

    NG

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

  8. READ VALUE USING GTS (DATA LIST)


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG) and the GTS 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

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here