CAN COMMUNICATION SYSTEM 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.

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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

Figure 1. Bus 2:

B003WQNE01

Figure 2. Bus 3:

B003U5ZE02

Figure 3. Bus 4 (w/ VGRS System):

B003T9AE02

Figure 4. Bus 5:

B003TLME02

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 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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  • 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 31 seconds, turn the lane departure alert system on using the LDA main switch, turn the dynamic radar cruise control system on using the cruise control main switch, and then drive the vehicle at a speed of 40 km/h (25 mph) or more for 14 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 as normal.

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  • 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 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 K141 central gateway ECU (network gateway ECU) connector.

      B003T5CC11
      *a

      Front view of wire harness connector

      (to Central Gateway ECU (Network Gateway ECU))

      		 - -

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

      Standard Resistance
      Bus 2 Branch Lines
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      K141-18 (CA4H) - K141-17 (CA4L) BE - B HIGH-level CAN bus line - LOW-level CAN bus line Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Bus 3 Main Lines
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      K141-6 (CA3H) - K141-19 (CAYH) V - R HIGH-level CAN bus line - HIGH-level CAN bus line Cable disconnected from negative (-) battery terminal Below 1 Ω
      K141-21 (CA3L) - K141-20 (CAYL) B - B LOW-level CAN bus line - LOW-level CAN bus line Cable disconnected from negative (-) battery terminal Below 1 Ω
      Bus 4 Branch Lines (w/ VGRS System)
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      K141-22 (CA2H) - K141-7 (CA2L) W - B HIGH-level CAN bus line - LOW-level CAN bus line Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Bus 5 Main Lines
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      K141-15 (CA5H) - K141-16 (CA5L) GR - B HIGH-level CAN bus line - LOW-level CAN bus line Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK (w/o Stop and Start System) A
      OK (w/ Stop and Start System) B
      NG (Bus 2 or Bus 4 Branch Lines) C
      NG (Bus 3 or Bus 5 Main Lines) D

    B

    CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) Click here

    C

    REPAIR OR REPLACE CAN BRANCH 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))

    A

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. B003SX6C06
      *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
      K141-10 (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
      K141-1 (BATT) - Body ground Always 11 to 14 V
      K141-2 (ACC) - Body ground Engine switch on (ACC) 11 to 14 V
      K141-11 (IG1) - Body ground Engine switch on (IG) 11 to 14 V
      K141-12 (IG2) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Result
      OK
      NG

    OK

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. B003SX6C06
      *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
      K141-10 (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
      K141-1 (BATT) - Body ground Always 11 to 14 V
      K141-2 (ACC) - Body ground Engine switch on (ACC) 11 to 14 V
      K141-11 (IG1) - Body ground Engine switch on (IG) 11 to 14 V
      K141-12 (IG2) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Result Proceed to
      OK A
      NG (IG1 terminal) B
      NG (Except IG1 terminal) C

    A

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) Click here

    B

    GO TO STOP AND START SYSTEM (FOR BACKUP BOOST CONVERTER CIRCUIT) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)