CAN COMMUNICATION SYSTEM(w/ Central Gateway ECU) Central Gateway ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Central Gateway ECU Communication Stop Mode When "BUS 2" is selected on the CAN Bus Check screen of the Techstream all ECUs and sensors except "CAN Gateway1" are not displayed.

  • Central gateway ECU branch line or connector

  • Power source circuit of central gateway ECU

  • Central gateway ECU

WIRING DIAGRAM

A01VZMWE04
A01W2IIE06

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 power 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 Click here.

  • 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 Click here.

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

  • DTC check procedure: Drive the vehicle at a speed of 36 km/h (22 mph) or more for 52 seconds or more.

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

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

Tech Tips


  • Operating the power 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 OPEN IN BUS 2 LINES (CENTRAL GATEWAY ECU BRANCH LINE)


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

    2. A01W0AOE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Central Gateway ECU)

      Disconnect the H193 central gateway ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Value
      H193-18 (CA4H) - H193-17 (CA4L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (CENTRAL GATEWAY ECU)

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A01VZ8RE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Central Gateway ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Value
      H193-10 (GND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω

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

    3. A01W4Y6E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Central Gateway ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Value
      H193-1 (BATT) - Body ground always 11 to 14 V
      H193-2 (ACC) - Body ground Engine switch on (ACC) 11 to 14 V
      H193-11 (IG1) - Body ground Engine switch on (IG) 11 to 14 V
      H193-12 (IG2) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Result Proceed to
      OK A
      NG (except 6AR-FSE) B
      NG (for 6AR-FSE) C

    A

    REPLACE CENTRAL GATEWAY ECU Click here

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    C

    CHECK FOR BACKUP BOOST CONVERTER CIRCUIT Click here