ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1243, C1245, C1279, C1418

DTC Code DTC Name
C1243 Acceleration Sensor Stuck Malfunction
C1245 Acceleration Sensor Output Malfunction
C1279 Acceleration Sensor Output Voltage Malfunction (Test Mode DTC)
C1418 Open or Short in Acceleration Sensor Circuit

DESCRIPTION

DTC No. DTC Detection Condition Trouble Area
C1243 When vehicle speed decreases from 30 km/h (18 mph) to 0 km/h (0 mph), deceleration sensor signal does not change 16 times or more..

  • Deceleration sensor

  • Deceleration sensor circuit

  • Brake actuator assembly (Skid control ECU)
C1245 At vehicle speed of 30 km/h (18 mph) or more, difference between back and forth G value calculated using G sensor signals and back and forth G value calculated using vehicle speed, exceeds 0.35 G for 60 seconds or more.

  • Deceleration sensor

  • Deceleration sensor circuit

  • Brake actuator assembly (Skid control ECU)
C1418

When any of following 1 through 3 detected:


  1. ECU terminal GL1 value of -1.5 G or less or 1.5 G or more continues for 1.2 seconds or more.

  2. Deceleration sensor terminal VGS voltage of 4.4 V or less or 5.6 V or more continues for 1.2 seconds or more.

  3. Deceleration sensor signal momentary open occurs 7 times or more.

  • Deceleration sensor

  • Deceleration sensor circuit

  • Brake actuator assembly (Skid control ECU)
C1279 Detected only during Test Mode.

  • Deceleration sensor

  • Sensor installation

WIRING DIAGRAM

A005GNUE18

CAUTION / NOTICE / HINT

Note


  • When replacing the brake actuator assembly (skid control ECU) or deceleration sensor, be sure to perform deceleration sensor 0 point calibration and CVT oil pressure calibration after performing AT/CVT learned values initialization.

    for K310 Click here

    for K411 Click here

  • Perform the test mode procedure after the initialization (perform the test mode start only after the brake actuator assembly (skid control ECU) is replaced).

    Tech Tips

    By performing the test mode start, the identification code of the brake actuator assembly (skid control ECU) is re-registered.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (DECELERATION SENSOR)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Chassis / ABS/VSC/TRC / Data List Click here.

    5. According to the display on the tester, read the Data List.

      ABS/VSC/TRC
      Tester Display Measurement Item / Range Normal Condition Diagnostic Note
      Deceleration sensor

      Deceleration sensor reading / Min.: -18.525 m/s2, Max.: 18.387 m/s2

      		-

      During deceleration/acceleration

      Changes continuously

    NG

    INSPECT DECELERATION SENSOR Click here

    OK

  2. CHECK DTC


    1. Clear the DTC Click here.

    2. Turn the ignition switch to ON again and check if the same DTCs are recorded Click here.

      Result
      Result Proceed to
      DTC not output A
      DTC output (for LHD) B
      DTC output (for RHD) C

    A

    CHECK INTERMITTENT PROBLEMS Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

  3. INSPECT DECELERATION SENSOR


    1. Remove the deceleration sensor Click here.

    2. A005IV9E01
      Text in Illustration
      *a Backward
      *b Forward

      Connect 3 dry cell batteries of 1.5 V in series.

    3. Connect the VGS terminal to the batteries' positive (+) terminal and the GGND terminal to the batteries' negative (-) terminal.

    4. Apply about 4.5 V between the VGS and GGND terminals.

      Note

      Do not apply voltage of 6 V or more to terminals VGS and GGND.

    5. Check the output voltage of the GL1 terminal when the sensor is tilted forward and backward.

      Standard Voltage:
      Tester Connection Sensor Condition Specified Condition
      1 (GL1) - Batteries' negative (-) terminal Horizontal About 2.3 V
      1 (GL1) - Batteries' negative (-) terminal Lean forward 0.4 to 2.3 V
      1 (GL1) - Batteries' negative (-) terminal Lean backward 2.3 to 4.0 V

      Tech Tips


      • If the sensor is tilted too much it may show the wrong value.

      • If dropped, the sensor should be replaced with a new one.

      • Check and ensure the correct installation direction of the deceleration sensor.


    NG

    REPLACE DECELERATION SENSOR Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU-DECELERATION SENSOR)


    1. Disconnect the A55 or A57 brake actuator assembly (skid control ECU) connector.

    2. Disconnect the F58 deceleration sensor connector.

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

      Standard Voltage (Check for Open)
      except LHD with CVT
      Tester Connection Condition Specified Condition
      A55- 26(VGS) - F58-3(VGS) Always Below 1 Ω
      A55-15 (GGND) - F58-2(GGND) Always Below 1 Ω
      A55-3 (GL1) - F58-1(GL1) Always Below 1 Ω
      for LHD with CVT
      Tester Connection Condition Specified Condition
      A57- 26(VGS) - F58-3(VGS) Always Below 1 Ω
      A57-15 (GGND) - F58-2(GGND) Always Below 1 Ω
      A57-3 (GL1) - F58-1(GL1) Always Below 1 Ω

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

      Standard Voltage (Check for Short)
      except LHD with CVT
      Tester Connection Condition Specified Condition
      A55- 26(VGS) - Body ground Always 10 kΩ or higher
      A55-15 (GGND) - Body ground Always 10 kΩ or higher
      A55-3 (GL1) - Body ground Always 10 kΩ or higher
      for LHD with CVT
      Tester Connection Condition Specified Condition
      A57- 26(VGS) - Body ground Always 10 kΩ or higher
      A57-15 (GGND) - Body ground Always 10 kΩ or higher
      A57-3 (GL1) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here