VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1381

DTC Code DTC Name
C1381 Abnormal Power Supply Voltage in Yaw Rate and/or Deceleration Sensor

DESCRIPTION

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

If there is a malfunction in the bus lines between the yaw rate and acceleration sensor and the CAN communication system, DTC U0124 (Lost Communication with Lateral Acceleration Sensor Module) are set.

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

DTC No. Detection Item DTC Detection Condition Trouble Area
C1381 Abnormal Power Supply Voltage in Yaw Rate and/or Deceleration Sensor At a vehicle speed of more than 3 km/h (2 mph), an acceleration sensor power source malfunction signal is received for 10 seconds or more.

  • Acceleration sensor power source circuit

  • Acceleration sensor (yaw rate and acceleration sensor)

  • Backup boost converter circuit (w/ stop and start system)

WIRING DIAGRAM

B003U3DE13

CAUTION / NOTICE / HINT

Note


  • When replacing the yaw rate and acceleration sensor, perform zero point calibration and store system information.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure (w/o Stop and Start System).

Tech Tips

When U0124 is output together with C1381, inspect and repair the trouble areas indicated by U0124 first.

Click here

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (IG TERMINAL)


    1. B003VBTC16
      *a

      Front view of wire harness connector

      (to Yaw Rate and Acceleration Sensor)

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

    2. Disconnect the K85 yaw rate and acceleration sensor connector.

    3. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K85-4 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Result Proceed to
      OK A
      NG (w/o Stop and Start System) B
      NG (w/ Stop and Start System) C

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG TERMINAL)

    C

    INSPECT STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (GND TERMINAL)


    1. B003VBTC18
      *a

      Front view of wire harness connector

      (to Yaw Rate and Acceleration Sensor)

      Turn the engine switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K85-1 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

  3. RECONFIRM DTC


    1. Reconnect the K85 yaw rate and acceleration sensor connector.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the engine switch off.

    4. Start the engine.

    5. Perform a road test.

    6. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTC C1381 is not output. A
      DTC C1381 is output B

      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 before replacing parts.

      Click here


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE YAW RATE AND ACCELERATION SENSOR Click here