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

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)

DESCRIPTION

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

The airbag ECU 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 ECU assembly) and the CAN communication system, DTCs U0123/62 (Lost Communication with Yaw Rate Sensor Module) and 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 ECU 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 ECU 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 ECU 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 ECU assembly) installed improperly

  • Acceleration sensor (Airbag ECU assembly)

ABS DTC

C1245/45

Acceleration Sensor Output Malfunction

581

At a vehicle speed of 30 km/h (19 mph) or more, 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 ECU assembly) installed improperly

  • Acceleration sensor (Airbag ECU assembly)

ABS DTC

C1279/79

Acceleration Sensor Output Voltage Malfunction (Test Mode DTC)

-

Detected only during Test Mode.

  • Sensor installation

  • Acceleration sensor (Airbag ECU assembly)

ABS Test Mode DTC

CAUTION / NOTICE / HINT

Note:

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

Click here

Tip:

When U0123/62 and/or U0124/95 is output together with C1234/34, C1243/43, C1244/44, and/or C1245/45, inspect and repair the trouble areas indicated by U0123/62 and/or 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.

      for LHD:Click hereClick hereClick here

      for RHD:Click hereClick hereClick 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

    for LHD:Click here

    for RHD:Click here

    C

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

    Click here

    A

  2. CHECK AIRBAG ECU ASSEMBLY INSTALLATION

    1. Turn the power switch off.

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

      Click here

      OK

      The airbag ECU assembly is tightened to the specified torque.

      The airbag ECU assembly is not tilted.

      Note:

      Check the yaw rate and acceleration sensor (airbag ECU assembly) signal after replacement.

      Click here

      Tip:

      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 ECU ASSEMBLY

    Click here

    NG

    INSTALL AIRBAG ECU ASSEMBLY CORRECTLY

    Click here