CAN COMMUNICATION SYSTEM (for LHD), Diagnostic DTC:U0123

DTC Code DTC Name
U0123 Lost Communication with Yaw Rate Sensor Module

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U0123 There is no communication from the yaw rate sensor.

  • Power source or inside of yaw rate sensor

  • Yaw rate sensor CAN branch wire or connector

  • Yaw rate sensor

WIRING DIAGRAM

A01GJJAE01

INSPECTION PROCEDURE

Note

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

Tech Tips

Operating the engine switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE


  1. PRECAUTION

    Note

    After turning the engine 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.


    NEXT

  2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note

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


    NEXT

  3. CHECK FOR OPEN IN CAN BUS WIRE (YAW RATE SENSOR CAN BRANCH WIRE)


    1. A01GLYIE12
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Yaw Rate Sensor)

      Disconnect the yaw rate sensor connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      L71-3 (CANH) - L71-2 (CANL) Engine switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE YAW RATE SENSOR CAN BRANCH WIRE OR CONNECTOR (CANH, CANL)

    OK

  4. CHECK HARNESS AND CONNECTOR (YAW RATE SENSOR - BATTERY AND BODY GROUND)


    1. A01GLYIE13
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Yaw Rate Sensor)

      Connect the cable to the negative (-) battery terminal.

      Note

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      L71-4 (IG) - Body ground Engine switch on (IG) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L71-1 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE YAW RATE SENSOR Click here