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

DTC Code DTC Name
C1243 Deceleration Sensor
C1245 Malfunction in Deceleration Sensor
C1279 Abnormal Output Voltage in Deceleration Sensor (Test Mode DTC)
C1418 Open or Short in Deceleration Sensor

DESCRIPTION

The skid control ECU (brake actuator assembly) receives signals from the deceleration sensor. If the sensor functions abnormally, the ABS warning light turns on.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1243 Deceleration Sensor While vehicle speed decreases from 30 km/h (19 mph) to 0 km/h (0 mph), sensor signal does not change 16 times or more.

  • Deceleration sensor

  • Deceleration sensor circuit

  • Skid control ECU (Brake actuator assembly)
C1245 Malfunction in Deceleration Sensor At vehicle speed of 30 km/h (19 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 installation

  • Deceleration sensor

  • Deceleration sensor circuit

  • Skid control ECU (Brake actuator assembly)
C1279 Abnormal Output Voltage in Deceleration Sensor (Test Mode DTC) Detected only during Test Mode.

  • Deceleration sensor installation

  • Deceleration sensor
C1418 Open or Short in Deceleration Sensor

One of the following conditions is met when the voltage at terminal IG1 is 9.5 V or higher:


  • The power supply voltage of the deceleration sensor is outside the range of 4.4 to 5.6 V for 1.2 seconds or more.

  • The value of GL1 is outside the range of -1.5 to 1.5 G for 1.2 seconds or more.

  • A deceleration sensor open circuit occurs 7 times or more.

  • Deceleration sensor installation

  • Deceleration sensor

  • Deceleration sensor circuit

  • Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM

B003P6YE27
*a Skid Control ECU (Brake Actuator Assembly)
*b Deceleration Sensor

CAUTION / NOTICE / HINT

Note

When replacing the skid control ECU (brake actuator assembly), perform Test Mode (Signal Check) to acquire the rear differential lock identification information.

Click here

PROCEDURE


  1. CHECK DECELERATION SENSOR INSTALLATION


    1. Check that the deceleration sensor is installed properly.

      Click here

      OK
      The sensor should be tightened to the specified torque.
      The sensor is not installed in a tilted position.
      Result
      Result Proceed to
      The sensor is tightened to the specified torque and the sensor is not tilted. A
      The sensor is not tightened to the specified torque or the sensor is tilted. B

    B

    DECELERATION SENSOR INSTALLATION Click here

    A

  2. READ VALUE USING GTS (DECELERATION SENSOR)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

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


      Chassis > ABS/VSC/TRC > Data List
      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

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      Deceleration Sensor

    6. Check that the deceleration value of the deceleration sensor displayed on the GTS changes when the vehicle is tilted.

      OK
      Deceleration value changes.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT DECELERATION SENSOR Click here

    OK

  3. RECONFIRM DTC


    1. Clear the DTC.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the ignition switch off.

    3. Drive the vehicle at a speed of 30 km/h (19 mph) or more for at least 60 seconds or more.

    4. Check if the same DTCs are recorded.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Proceed to
      DTC is output
      DTC is not output

    DTC is output

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    DTC is not output

    USE SIMULATION METHOD TO CHECK Click here

  4. INSPECT DECELERATION SENSOR


    1. Turn the ignition switch off.

    2. Remove the deceleration sensor.

      Click here

    3. Inspect the deceleration sensor.

      Click here

      OK
      The deceleration sensor is normal.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE DECELERATION SENSOR Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - DECELERATION SENSOR)


    1. Disconnect the A68 skid control ECU (brake actuator assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A68-3 (GL1) - N51-1 (GL1) Always Below 1 Ω
      A68-26 (VGS) - N51-3 (VGS) Always Below 1 Ω
      A68-15 (GGND) - N51-2 (GGND) Always Below 1 Ω
      A68-3 (GL1) or N51-1 (GL1) - Body ground Always 10 kΩ or higher
      A68-26 (VGS) or N51-3 (VGS) - Body ground Always 10 kΩ or higher
      A68-15 (GGND) or N51-2 (GGND) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR