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 parking brake ECU assembly.

DTC Code Detection Condition Trouble Area
C13A8/44

All of following conditions are met:


  1. Power switch is on (IG), or when power switch is off, electric parking brake switch assembly lock control is operating

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

  3. Problem occurs for approx. 1 sec.

  • Parking brake with bracket actuator assembly

  • Wire harness or connector

  • Parking brake ECU assembly

WIRING DIAGRAM

A01FRD7E02

INSPECTION PROCEDURE

Note


  • 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.

  • Before disconnecting connectors or fuses, turn the power switch off and wait 20 seconds or more.

  • 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 GTS to the DLC3.

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

    4. Clear the DTC Click here.


    NEXT

  2. CHECK DTC


    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. Check for DTC Click here.

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

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

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


    1. Disconnect the U36 and U37 parking brake ECU assembly connectors.

    2. Disconnect the U40 parking brake with bracket actuator assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U36-3 (GND1) - Body ground Always Below 1 Ω
      U37-8 (TSEN) - U40-5 (TSEN) Always Below 1 Ω
      U37-8 (TSEN) - Body ground Always 10 kΩ or higher
      U37-6 (TSN2) - U40-10 (TSN2) Always Below 1 Ω
      U37-6 (TSN2) - Body ground Always 10 kΩ or higher
      U37-7 (VT) - U40-6 (VT) Always Below 1 Ω
      U37-7 (VT) - Body ground Always 10 kΩ or higher
      U37-14 (TGND) - U40-1 (TGND) Always Below 1 Ω
      U37-14 (TGND) - Body ground Always 10 kΩ or higher
      U37-10 (SG) - U40-2 (SG) Always Below 1 Ω
      U37-10 (SG) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK PARKING BRAKE ECU ASSEMBLY (VT VOLTAGE)


    1. Connect the parking brake ECU assembly connector.

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

    3. A01FTHFE05
      Text in Illustration
      *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
      U37-7 (VT) - U37-14 (TGND) Power switch on (IG) 4.75 to 5.25 V

    NG

    CHECK PARKING BRAKE ECU ASSEMBLY (VT VOLTAGE) Click here

    OK

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

    A01FTHFE07
    Text in Illustration
    *a

    Component with harness connected

    (Parking Brake ECU Assembly)

    1. Measure the voltage between the terminals below.

      Tester Connection Switch Condition
      (A) U37-6 (TSN2) - U37-14 (TGND) Power switch on (IG)
      (B) U37-8 (TSEN) - U37-14 (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
      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. Remove the parking brake ECU assembly Click here.

    2. A01FSKBE02
      Text in Illustration
      *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
      U37-8 (TSEN) - U36-3 (GND1) Always 4 to 6 kΩ
      U37-6 (TSN2) - U36-3 (GND1) Always 4 to 6 kΩ
      U37-14 (TGND) - U36-3 (GND1) Always Below 1 Ω
      U37-10 (SG) - U36-3 (GND1) Always Below 1 Ω

    NG

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

    OK

    REPLACE PARKING BRAKE WITH BRACKET ACTUATOR ASSEMBLY Click here

  7. CHECK PARKING BRAKE ECU ASSEMBLY (VT VOLTAGE)


    1. Disconnect the parking brake with bracket actuator assembly connector.

    2. Turn the power switch on (IG).

    3. A01FQNPE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Parking Brake with Bracket Actuator Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      U40-6 (VT) - U40-1 (TGND) Power switch on (IG) 4.75 to 5.25 V

    NG

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

    OK

    REPLACE PARKING BRAKE WITH BRACKET ACTUATOR 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.

      Electric Parking Brake
      Tester Display Measurement Item/Range Switch Condition Normal Condition
      +B Voltage Value

      Electric parking brake motor power source information display/

      Lo, Mid or Hi

      		 Power switch on (IG) Hi
      Invalid Tension Sensor Output

      Tension sensor output invalid display/

      Enable or Disable

      		 Power switch on (IG) Enable
      Invalid Tension Sensor PWR

      Tension sensor power source invalid display/

      Enable or Disable

      		 Power switch on (IG) Enable
      Invalid Tension Sensor Comp

      Tension sensor comparison invalid display/

      Enable or Disable

      		 Power switch on (IG) Enable
      OK
      Values are as shown in normal condition.

    NG

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here