ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1381

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

DESCRIPTION

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

If a power source malfunction signal from the yaw rate and acceleration sensor (airbag sensor assembly) is detected by the skid control ECU (brake booster with master cylinder assembly), DTC C1381 is stored.

DTC C1381 may be stored due to an intermittent low power source voltage.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1381 Abnormal Power Supply Voltage in Yaw Rate and/or Deceleration Sensor 601 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.

  • Wire harness or connector

  • Acceleration sensor (airbag sensor assembly)

 ABS DTC

WIRING DIAGRAM

B006HHFE77
*a from IG2-NO. 2 Relay
*b CAN Communication Line
*c Yaw Rate and Acceleration Sensor (Airbag Sensor Assembly)
*d Skid Control ECU (Brake Booster with Master Cylinder Assembly)

CAUTION / NOTICE / HINT

Note


  • After replacing or reinstalling the yaw rate and acceleration sensor (airbag sensor assembly), perform yaw rate and acceleration sensor zero point calibration after clearing previously calibrated data.

    Click here

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (IG2 TERMINAL)


    1. B006ICWC29
      *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.

      OK
      The connector is securely connected.

    2. Disconnect the I59 yaw rate and acceleration sensor (airbag sensor assembly) connector.

    3. Check both the connector case and the terminals for deformation and corrosion.

      OK
      No deformation or corrosion.

    4. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I59-21 (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

  2. CHECK HARNESS AND CONNECTOR (GND TERMINAL)


    1. B006ICWC30
      *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
      I59-25 (E1) - Body ground Always Below 1 Ω
      I59-26 (E2) - 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 I59 yaw rate and acceleration sensor (airbag sensor assembly) connector.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the power switch off.

    4. Turn the power switch on (READY).

    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

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE AIRBAG SENSOR ASSEMBLY Click here