ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1234/34, C1243/43, C1244/44, C1245/45, C1279/79, C1381/97

DTC Code DTC Name
C1234/34 Yaw Rate Sensor Malfunction
C1243/43 Acceleration Sensor Stuck Malfunction
C1244/44 Open or Short in Acceleration Sensor Circuit
C1245/45 Acceleration Sensor Output Malfunction
C1279/79 Acceleration Sensor Output Voltage Malfunction (Test Mode DTC)
C1381/97 Acceleration Sensor Power Supply Voltage Malfunction

DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via CAN communication.

The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition using 2 circuits (GL1, GL2).

If there are malfunctions in the bus lines between the yaw rate and acceleration sensor (airbag sensor assembly) and the CAN communication system, DTC U0124/95 (Lost Communication with Lateral Acceleration Sensor Module) will be stored.

These DTCs are also output when zero point calibration has not been completed.

DTC C1279/79 will be cleared when the yaw rate and acceleration sensor (airbag sensor assembly) sends a yaw rate and/or acceleration signal or when Test Mode ends. DTC C1279/79 is output only in Test Mode.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1234/34 Yaw Rate Sensor Malfunction

711

712

713

714

  • INF Code: 711


    • While yaw rate sensor communication is enabled, a malfunction signal is received during the sensor self-check (Sensor 1 (GL1) malfunction).

  • INF Code: 712


    • While yaw rate sensor communication is enabled, a malfunction signal is received during the sensor self-check (Sensor 2 (GL2) malfunction).

  • INF Code: 713


    • While yaw rate sensor communication is enabled, a malfunction signal is received during the sensor self-check (Zero point calibration malfunction).

  • INF Code: 714


    • While yaw rate sensor communication is enabled, a malfunction signal is received during the sensor self-check (Two-value comparison malfunction).

 Yaw rate sensor (Airbag sensor assembly) internal malfunction VSC DTC
C1243/43 Acceleration Sensor Stuck Malfunction

561

562

563

564

565

  • INF Code: 561


    • An acceleration sensor malfunction occurs 16 times or more when the vehicle speed drops from above 30 km/h (19 mph) to 0 km/h (0 mph).

  • INF Code: 562, 563, 564, 565


    • A stuck acceleration sensor value is determined.

 Acceleration sensor (Airbag sensor assembly) internal stuck malfunction ABS DTC
C1244/44 Open or Short in Acceleration Sensor Circuit 571

Either of the following is detected:


  1. Difference between GL1 and GL2 does not become less than 0.4 G for 60 seconds or more after reaching 0.6 G when the vehicle is stopped.

  2. A malfunction signal from the acceleration sensor is received.

  • Acceleration sensor (Airbag sensor assembly) installed improperly

  • Acceleration sensor (Airbag sensor assembly)

 ABS DTC
C1245/45 Acceleration Sensor Output Malfunction 581 Difference between longitudinal G calculated from the acceleration sensor value and that calculated from the vehicle speed exceeds 0.35 G for 60 seconds or more.

  • Acceleration sensor (Airbag sensor assembly) installed improperly

  • Acceleration sensor (Airbag sensor assembly)

 ABS DTC
C1279/79 Acceleration Sensor Output Voltage Malfunction (Test Mode DTC) - Detected only during Test Mode.

  • Sensor installation

  • Acceleration sensor (Airbag sensor assembly)

 ABS Test Mode DTC
C1381/97 Acceleration Sensor Power Supply Voltage Malfunction 601 While acceleration sensor communication is enabled, a supply voltage malfunction signal is received from the sensor for 10 seconds.

  • Acceleration sensor (Airbag sensor assembly) supply voltage shut down

  • Acceleration sensor (Airbag sensor assembly)

  • Skid control ECU (Brake booster with master cylinder assembly)

 ABS DTC

WIRING DIAGRAM

A01KTHJE09

CAUTION / NOTICE / HINT

Note


  • When replacing the yaw rate and acceleration sensor (airbag sensor assembly), perform zero point calibration.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

Tech Tips

When U0124/95 is output together with C1234/34, C1243/43, C1244/44, C1245/45, and/or C1381/97, inspect and repair the trouble areas indicated by U0124/95 first.

Click here

PROCEDURE


  1. CHECK DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the power switch off.

    3. Turn the power switch on (READY).

    4. Drive the vehicle at a speed of 30 km/h (19 mph) or more, turn the steering wheel, and decelerate (depress the brake pedal) the vehicle.

    5. Turn the power switch on (IG) again and check that no CAN communication system DTCs are output.

      Click here

    6. Check if DTC C1210/36 (Zero Point Calibration of Yaw Rate Sensor Undone) or C1336/98 (Zero Point Calibration of Acceleration Sensor Undone) is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs (C1210/36, C1336/98 and CAN communication system DTCs) are not output. A
      CAN communication system DTCs are output. B
      DTCs C1210/36 and/or C1336/98 are output. C

    B

    INSPECT CAN COMMUNICATION SYSTEM Click here

    C

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  2. CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION


    1. Turn the power switch off.

    2. Check that the yaw rate and acceleration sensor (airbag sensor assembly) has been installed properly.

      Click here

      OK
      The airbag sensor assembly is tightened to the specified torque.
      The airbag sensor assembly is not tilted.
      Result
      Proceed to
      OK
      NG

    NG

    INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (IG2 TERMINAL)


    1. A01KSF0C20
      *a

      Front view of wire harness connector

      (to Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly))

      Make sure that there is no looseness at the locking part and the connecting part of the connector.

    2. Disconnect the E14 yaw rate and acceleration sensor (airbag sensor 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 Condition Specified Condition
      E14-21 (IG2) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 CIRCUIT)

    OK

  4. CHECK HARNESS AND CONNECTOR (E TERMINAL)


    1. A01KSF0C21
      *a

      Front view of wire harness connector

      (to Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly))

      Turn the power switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E14-25 (E1) - Body ground Always Below 1 Ω
      E14-26 (E2) - Body ground Always Below 1 Ω

      Note

      Check the yaw rate and acceleration sensor signal after replacement.

      Click here

      Tech Tips

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (E CIRCUIT)