VEHICLE STABILITY CONTROL SYSTEM(for Hydraulic Brake Booster), Diagnostic DTC:C1381

DTC Code DTC Name
C1381 Acceleration Sensor Power Supply Voltage Malfunction

DESCRIPTION

The skid control ECU receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via the CAN communication system.

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

If there is trouble in the bus lines between the yaw rate and acceleration sensor (airbag sensor assembly) and the CAN communication system, DTCs U0123 (malfunction in CAN communication with the yaw rate sensor) and U0124 (malfunction in CAN communication with the acceleration sensor) are stored.

These DTCs are also stored when calibration has not been completed.

DTC Code DTC Detection Condition Trouble Area
C1381 At a vehicle speed of more than 3 km/h (2 mph), the acceleration sensor power source malfunction signal is received for 10 seconds or more.

  • A/BAG-IG2 fuse

  • Yaw rate and acceleration sensor (Airbag sensor assembly)

  • Yaw rate and acceleration sensor (Airbag sensor assembly) power source circuit

WIRING DIAGRAM

B001CP9E23
*1 Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly)
*2 Skid Control ECU (Master Cylinder Solenoid)
*3 CAN Communication line

CAUTION / NOTICE / HINT

Note


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

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

PROCEDURE


  1. CHECK DTC (CAN COMMUNICATION SYSTEM)


    1. w/ Central Gateway ECU:

      Check for DTCs Click here.

    2. w/o Central Gateway ECU:

      Check for DTCs Click here.

      Result
      Result Proceed to
      CAN DTC is not output A
      CAN DTC is output (w/ Central Gateway ECU) B
      CAN DTC is output (w/o Central Gateway ECU) C

    B

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    C

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    A

  2. CHECK TERMINAL VOLTAGE (IG2 TERMINAL)

    Note


    • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.

    • When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.


    1. Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    3. Disconnect the G1 yaw rate and acceleration sensor (airbag sensor assembly) connector.

    4. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    5. Turn the ignition switch ON.

    6. Operate all the components of the electrical system (defogger, wipers, headlights, heater blower, etc.).

    7. B001DZWE05
      Text in Illustration
      *a

      Front view of wire harness connector

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G1-21 (IG2) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG CIRCUIT)

    OK

  3. CHECK HARNESS AND CONNECTOR (GND TERMINAL)


    1. Disconnect the G1 yaw rate and acceleration sensor (airbag sensor assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G1-25 (E1) - Body ground Always Below 1 Ω
      G1-26 (E2) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

  4. RECONFIRM DTC


    1. Reconnect the yaw rate and acceleration sensor (airbag sensor assembly) connector.

    2. Clear the DTCs Click here.

    3. Start the engine.

    4. Perform a road test.

    5. Check if the same DTC is output Click here.

      Result
      Result Proceed to
      DTC C1381 is not output A
      DTC C1381 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE AIRBAG SENSOR ASSEMBLY Click here