CAN COMMUNICATION SYSTEM(w/ Central Gateway ECU) 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:

  • Communication stop for "CAN Gateway1" and/or "CAN Gateway2" is indicated on the "Communication Bus Check" screen of the GTS.

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

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  • Central gateway ECU (network gateway ECU) main line or connector

  • Central gateway ECU (network gateway ECU) branch line or connector

  • Power source circuit of central gateway ECU (network gateway ECU)

  • Central gateway ECU (network gateway ECU) ground circuit

  • Central gateway ECU (network gateway ECU)

WIRING DIAGRAM

C355799E03
C355800E04
C355801E03

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.

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

    DTC check procedure: Turn the ignition switch to ON and wait at least 20 seconds, and then drive the vehicle at a speed of 5 km/h (3 mph) or more for 83 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.

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

Tip:

  • Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.

  • When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

PROCEDURE

  1. CHECK FOR OPEN IN CAN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) MAIN OR BRANCH LINE)

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

    2. Disconnect the E139 central gateway ECU (network gateway ECU) connector.

    3. C334701C78

      *a

      Front view of wire harness connector

      (to Central Gateway ECU (Network Gateway ECU))

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

      Standard Resistance

      Table 1. Bus 2 Branch Lines

      Tester Connection

      Condition

      Specified Condition

      E139-18 (CA4H) - E139-17 (CA4L)

      Cable disconnected from negative (-) battery terminal

      54 to 69 Ω
      Table 2. Bus 3 Main Lines

      Tester Connection

      Condition

      Specified Condition

      E139-6 (CA3H) - E139-19 (CAYH)

      Cable disconnected from negative (-) battery terminal

      Below 1 Ω

      E139-21 (CA3L) - E139-20 (CAYL)
      Table 3. Bus 5 Main Lines

      Tester Connection

      Condition

      Specified Condition

      E139-15 (CA5H) - E139-9 (CAXH)

      Cable disconnected from negative (-) battery terminal

      Below 1 Ω

      E139-16 (CA5L) - E139-24 (CAXL)

    Result

    Result

    Proceed to

    OK

    A

    NG (Bus 2 branch lines)

    B

    NG (Bus 3 main lines)

    C

    NG (Bus 5 main lines)

    D
    B

    REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

    C

    REPAIR OR REPLACE CAN MAIN LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

    D

    REPAIR OR REPLACE CAN MAIN LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

    A

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

    1. C334701C79

      *a

      Front view of wire harness connector

      (to Central Gateway ECU (Network Gateway ECU))

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E139-10 (GND) - Body ground

      Cable disconnected from negative (-) battery terminal

      Below 1 Ω

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

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      E139-1 (BATT) - Body ground

      Always

      11 to 14 V

      E139-2 (ACC) - Body ground

      Ignition switch ACC

      11 to 14 V

      E139-11 (IG1) - Body ground

      Ignition switch ON

      11 to 14 V

      E139-12 (IG2) - Body ground

      Ignition switch ON

      11 to 14 V

    Result

    Result

    OK

    NG
    OK

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

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    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)