VEHICLE STABILITY CONTROL SYSTEM, 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 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 and the CAN communication system, DTCs U0123 (Lost Communication with Yaw Rate Sensor Module) and U0124 (Lost Communication with Lateral Acceleration Sensor Module) are set.

These DTCs are also output 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), an acceleration sensor power source malfunction signal is received for 10 seconds or more.
  • Yaw rate and acceleration sensor power source circuit

  • Yaw rate and acceleration sensor

WIRING DIAGRAM

Refer to DTCs C1232, C1243 and C1245 Click here.

INSPECTION PROCEDURE

Note

When replacing the yaw rate and acceleration sensor, perform zero point calibration Click here.

Tech Tips

When DTC U0123, U0124 and/or U0126 is output together with DTC C1381, inspect and repair the trouble areas indicated by DTC U0123, U0124 and/or U0126 first Click here.

PROCEDURE


  1. INSPECT YAW RATE AND ACCELERATION SENSOR (IG TERMINAL)


    1. A01616CE69
      Text in Illustration
      *1

      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 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 Switch Condition Specified Condition
      J115-4 (IG) - Body ground Engine switch on (IG) 11 to 14 V

    NG
    OK
  2. INSPECT YAW RATE AND ACCELERATION SENSOR (GND TERMINAL)


    1. A01616CE70
      Text in Illustration
      *1

      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
      J115-1 (GND) - Body ground Always Below 1 Ω

    NG
    OK
  3. RECONFIRM DTC


    1. Reconnect the yaw rate and acceleration sensor connector.

    2. Clear the DTCs Click here.

    3. Start the engine.

    4. Drive the vehicle at a speed of 3 km/h (2 mph) or more for at least 10 seconds.

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

      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 Click here.


    B
    A