CAN COMMUNICATION SYSTEM(for RHD) Steering Control ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Steering Control ECU Communication Stop Mode

Either condition is met:


  • Communication stop for "Vertical Acceleration Sensor" is indicated on the "Communication Bus Check" screen of the GTS.

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  • Communication system DTCs (DTCs that start with U) that are output correspond to "Steering Control ECU Communication Stop Mode" in "DTC Combination Table".

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  • Power source circuit of roll rate and vertical acceleration sensor (yaw rate sensor)

  • Roll rate and vertical acceleration sensor (yaw rate sensor) ground circuit

  • Roll rate and vertical acceleration sensor (yaw rate sensor) CAN branch wire or connector

  • Roll rate and vertical acceleration sensor (yaw rate sensor)

WIRING DIAGRAM

B002DYZE08
*a No. 8 CAN Junction Connector
*b from RH-IG1 RLY1 Relay
*c Roll Rate and Vertical Acceleration Sensor (Yaw Rate Sensor)

CAUTION / NOTICE / HINT

Note


  • Before measuring the resistance of the CAN bus, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

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  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

  • DTC check procedure: Turn the engine switch on (IG) and wait at least 60 seconds.

  • After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.

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

Tech Tips


  • Operating the engine switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. CHECK FOR OPEN IN CAN BUS WIRE (ROLL RATE AND VERTICAL ACCELERATION SENSOR (YAW RATE SENSOR) BRANCH WIRE)


    1. B002DCCC03
      *a

      Front view of wire harness connector

      (to Roll Rate and Vertical Acceleration Sensor (Yaw Rate Sensor))

      Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the roll rate and vertical acceleration sensor (yaw rate sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K79-3 (YAW1) - K79-2 (YAW2) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (ROLL RATE AND VERTICAL ACCELERATION SENSOR (YAW RATE SENSOR))

    OK

  2. CHECK HARNESS AND CONNECTOR (ROLL RATE AND VERTICAL ACCELERATION SENSOR (YAW RATE SENSOR) - BATTERY AND BODY GROUND)


    1. B002DCCC04
      *a

      Front view of wire harness connector

      (to Roll Rate and Vertical Acceleration Sensor (Yaw Rate Sensor))

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

      Note

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      K79-4 (IGA) - 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
      K79-1 (GNDA) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ROLL RATE AND VERTICAL ACCELERATION SENSOR (YAW RATE SENSOR) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR