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 Gateway" is not displayed on the "Bus Check" screen.

  • "Gateway ECU Communication Stop Mode" in "DTC Communication Table" applies.

  • Power source or inside of network gateway ECU

  • Network gateway ECU CAN branch wire or connector

  • Network gateway ECU

WIRING DIAGRAM

A01XAOLE18

CAUTION / NOTICE / HINT

Note

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

Tech Tips

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

PROCEDURE


  1. PRECAUTION

    Note

    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.


    NEXT

  2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.

      CAUTION:

      For vehicles with an SRS system:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note

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


    NEXT

  3. CHECK FOR OPEN IN CAN BUS WIRE (NETWORK GATEWAY ECU CAN BRANCH WIRE)


    1. A01X2MOE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Network Gateway ECU)

      Disconnect the E31 network gateway ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E31-16 (CA1H) - E31-15 (CA1L) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE NETWORK GATEWAY ECU BRANCH WIRE OR CONNECTOR (CA1H, CA1L)

    OK

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


    1. A01X74LE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Network Gateway ECU)

      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
      E31-4 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E31-2 (BATT) - Body ground Always 11 to 14 V
      E31-10 (IG1) - Body ground Ignition switch ON 11 to 14 V
      E31-9 (IG2) - Body ground Ignition switch ON 11 to 14 V

    OK

    REPLACE NETWORK GATEWAY ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR