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

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

  • 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

B005Y61E13
B005Y20E05
B005ZMWE04

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

Note


  • Before measuring the resistance of the CAN bus, turn the power 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 (-) auxiliary 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 (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary 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: Turn the power switch on (IG) and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes 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 as normal Click here.

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

Tech Tips


  • 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 HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


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

    2. Disconnect the L192 central gateway ECU (network gateway ECU) connector.

    3. B005Y4AE02
      Text in Illustration
      *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
      L192-10 (GND) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L192-1 (BATT) - Body ground Power switch off 11 to 14 V
      L192-2 (ACC) - Body ground Power switch on (ACC) 11 to 14 V
      L192-11 (IG1) - Body ground Power switch on (IG) 11 to 14 V
      L192-12 (IG2) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  2. CHECK FOR OPEN IN CAN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))


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

    2. B005Z2DE02
      Text in Illustration
      *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
      Bus 2 Branch Line
      Tester Connection Condition Specified Condition
      L192-18 (CA4H) - L192-17 (CA4L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Bus 3 Main Line
      Tester Connection Condition Specified Condition
      L192-6 (CA3H) - L192-19 (CAYH) Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      L192-21 (CA3L) - L192-20 (CAYL) Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      Bus 5 Main Line
      Tester Connection Condition Specified Condition
      L192-15 (CA5H) - L192-9 (CAXH) Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      L192-16 (CA5L) - L192-24 (CAXL) Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      Result
      Result Proceed to
      OK A
      NG (Bus 2 Branch line) B
      NG (Bus 3 Main line) C
      NG (Bus 5 Main line) D

    A

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) Click here

    B

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

    C

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

    D

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