CAN COMMUNICATION SYSTEM Central Gateway ECU Communication Stop Mode

DTC Code DTC Name
Central Gateway ECU Communication Stop Mode

DESCRIPTION

Detection Item

Symptom

Trouble Area

Central Gateway ECU Communication Stop Mode

Either condition is met:

  • "CAN Gateway" is not displayed on the "CAN Bus Check" screen (Click here).

  • Communication system DTCs (DTCs that start with U) that are output correspond to "Central Gateway ECU Communication Stop Mode" in "DTC Combination Table" (Click here).

  • Network gateway ECU CAN main wire or connector

  • Network gateway ECU CAN branch wire or connector

  • Power source or inside of network gateway ECU

  • Network gateway ECU ground circuit

  • Network gateway ECU

WIRING DIAGRAM

C350773E02

CAUTION / NOTICE / HINT

Note:

  • 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).

  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key, 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 ignition 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).

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

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

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

Tip:

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

  • 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 (NETWORK GATEWAY ECU CAN MAIN OR BRANCH WIRE)

    1. U184740E01

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

    2. Disconnect the network gateway ECU connector.

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

      Standard Resistance

      Table 1. Bus 2

      Tester Connection

      Condition

      Specified Condition

      H131-18 (CA4H) - H131-17 (CA4L)

      Cable disconnected from negative (-) battery terminal

      54 to 69 Ω
      Table 2. Bus 3

      Tester Connection

      Condition

      Specified Condition

      H131-6 (CA3H) - H131-21 (CA3L)

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher

      H131-19 (CAYH) - H131-20 (CAYL)

      Cable disconnected from negative (-) battery terminal

      200 Ω or higher
      Table 3. Text in Illustration

      *A

      Bus 2

      *B

      Bus 3

      *a

      Front view of wire harness connector

      (to Network Gateway ECU)

    REPAIR OR REPLACE CAN MAIN OR BRANCH WIRE CONNECTED TO NETWORK GATEWAY ECU (CA3H, CA3L, CA4H, CA4L, CAYH, CAYL)

  2. CHECK HARNESS AND CONNECTOR (NETWORK GATEWAY ECU - BATTERY AND BODY GROUND)

    1. U184739E01

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H131-10 (GND) - Body ground

      Always

      Below 1 Ω

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

      Standard Voltage

      Tester Condition

      Condition

      Specified Condition

      H131-1 (BATT) - Body ground

      Always

      11 to 14 V

      H131-2 (ACC) - Body ground

      Ignition switch ACC

      11 to 14 V

      H131-11 (IG1) - Body ground

      Ignition switch ON

      11 to 14 V

      H131-12 (IG2) - Body ground

      Ignition switch ON

      11 to 14 V
    Table 4. Text in Illustration

    *a

    Front view of wire harness connector

    (to Network Gateway ECU)
    Table 5. Result

    Result

    Proceed to

    OK (for LHD)

    A

    OK (for LHD)

    B

    NG

    C

    REPLACE NETWORK GATEWAY ECU

    (Click here)

    REPLACE NETWORK GATEWAY ECU

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR