ELECTRONICALLY CONTROLLED BRAKE SYSTEM(w/ Vacuum Brake Booster), Diagnostic DTC:C1381

DTC Code DTC Name
C1381 Acceleration Sensor Power Supply Voltage Malfunction

DESCRIPTION

This DTC is stored when the skid control ECU (brake actuator assembly) receives a sensor supply voltage malfunction signal from the acceleration sensor (yaw rate sensor).

DTC No. Detection Item DTC Detection Condition Trouble Area Note
C1381 Acceleration Sensor Power Supply Voltage Malfunction 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.

  • IG1 P NO. 3 fuse*2

  • Acceleration sensor (yaw rate sensor) power source circuit

  • Acceleration sensor (yaw rate sensor)

  • Backup boost converter circuit*1

  • Wire harness or connector

 -

WIRING DIAGRAM

B006C67E01

CAUTION / NOTICE / HINT

Note


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

    Click here

  • w/o Stop and Start System:

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (IG TERMINAL)


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

    2. Disconnect the G42 acceleration sensor (yaw rate sensor) connector.

    3. Turn the engine switch on (IG).

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

      Standard Voltage
      w/ Stop and Start System:
      Tester Connection Switch Condition Specified Condition
      G42-4 (IG) - Body ground Engine switch on (IG) 10.5 to 16 V
      w/o Stop and Start System:
      Tester Connection Switch Condition Specified Condition
      G42-4 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG (w/ Stop and Start System)
      NG (w/o Stop and Start System)

    NG (w/ Stop and Start System)

    INSPECT STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT) for 8GR-FKS: Click here
    INSPECT STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT) for V35A-FTS: Click here

    NG (w/o Stop and Start System)

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG CIRCUIT)

    OK

  2. CHECK HARNESS AND CONNECTOR (GND TERMINAL)


    1. 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
      G42-1 (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 G42 acceleration sensor (yaw rate 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 acceleration sensor (yaw rate sensor) signal after replacement.

      Click here


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE YAW RATE SENSOR Click here