CAN COMMUNICATION SYSTEM(for LHD) Gateway ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Gateway ECU Communication Stop Mode

Either condition is met:


  • "CAN Gateway1" is not displayed on "CAN Bus Check".

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

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  • Power source circuit of network gateway ECU

  • Network gateway ECU ground circuit

  • Network gateway ECU CAN branch wire or connector

  • Network gateway ECU

  • Engine stop and start ECU

WIRING DIAGRAM

Figure 1. w/o Stop and Start System

A01XO7KE16

Figure 2. w/ Stop and Start System

A01XOIGE02

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, 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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  • 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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  • 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 300 seconds, and then drive the vehicle at a speed of 36 km/h (22 mph) or more for 7 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.

Tech Tips


  • Operating the engine 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 FOR OPEN IN CAN BUS WIRE (NETWORK GATEWAY ECU BRANCH WIRE)


    1. A01XNOZC05
      *a

      Front view of wire harness connector

      (to Network Gateway ECU)

      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
      Tester Connection Condition Specified Value
      I67-16 (CA1H) - I67-15 (CA1L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (NETWORK GATEWAY ECU)

    OK

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


    1. A01XNOZC09
      *a

      Front view of wire harness connector

      (to Network Gateway ECU)

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

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I67-2 (BATT) - Body ground Always 11 to 14 V
      I67-9 (IG2) - Body ground Engine switch on (IG) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I67-4 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (NETWORK GATEWAY ECU - BATTERY)


    1. A01XNOZC10
      *a

      Front view of wire harness connector

      (to Network Gateway ECU)

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

      Standard Voltage
      w/o Stop and Start System
      Tester Connection Switch Condition Specified Condition
      I67-10 (IG1) - Body ground Engine switch on (IG) 11 to 14 V
      w/ Stop and Start System
      Tester Connection Switch Condition Specified Condition
      I67-10 (IG1) - Body ground Engine switch on (IG) 10.5 to 16 V
      Result
      Result Proceed to
      OK A
      NG (w/o Stop and Start System) B
      NG (w/ Stop and Start System) C

    A

    REPLACE NETWORK GATEWAY ECU Click here

    B

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    C

  4. CHECK HARNESS AND CONNECTOR (NETWORK GATEWAY ECU - ENGINE STOP AND START ECU)


    1. Disconnect the I57 engine stop and start ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I67-10 (IG1) - I57-12 (IGO1) Always Below 1 Ω
      I67-10 (IG1) or I57-12 (IGO1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STOP AND START SYSTEM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR