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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Can Communication System (Except HV) - Circuit Tests (1 Of 8) & Diagnostic Codes >> CAN COMMUNICATION SYSTEM (for Gasoline Model) >> Check CAN Communication Connection [12/2019 - 11/2023] >> Procedure

Check CAN Communication Connection [12/2019 - 11/2023]: Procedure

  1. CHECK GTS OPERATION 
    1. Connect the GTS to the DLC3 of another vehicle.
    2. Turn the ignition switch to ON.
    3. Turn the GTS on.
    4. Check that the GTS and ECUs can communicate with the ignition switch ON.

      HINT: 

      • ECUs and sensors are not displayed on the "Communication Bus Check" screen when the GTS cannot communicate with the vehicle.
      • If communication between the GTS and ECUs is not possible, either the GTS or vehicle has a malfunction.
      • If communication between the GTS and ECUs is still not possible even when the GTS is connected to another vehicle, the GTS has a malfunction. Perform the self tests described in the GTS operator's manual. (The GTS may be malfunctioning or its battery may be discharged.)

      Result

      Result Proceed to
      OK (Communication between the GTS and the vehicle is not possible but communication is possible when connected to another vehicle.) A
      NG (Communication is not possible between the GTS and the vehicle, nor between the GTS and another vehicle.) B

    Result: 

    B 

    REFER TO GTS OPERATOR'S MANUAL 

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (DLC3 POWER SOURCE CIRCUIT) 
    NOTE:

    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.

    HINT: 

    Operating the ignition 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.

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      H56-16 (BAT) - Body ground Always 11 to 14 V
      GTY921295Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3
    2. Disconnect the cable from the negative (-) battery terminal.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H56-4 (CG) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (DLC3 POWER SOURCE CIRCUIT) 

    Result: 

    OK 

    See step  3

  3. CHECK OPEN IN CAN BUS LINES 
    1. Measure the resistance according to the value(s) in the table below.
      GTY921294Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3

      Standard Resistance

      Tester Connection Condition Specified Condition
      H56-6 (CANH) - H56-14 (CANL) Cable disconnected from negative (-) battery terminal Below 70 Ω

      HINT: 

      If the resistance between CANH and CANL is not as specified, a connector may have been loose or disconnected during inspection. If a connector is loose or disconnected, connect it and perform the inspection again.

      Result

      Result
      OK
      NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  4

  4. CHECK SHORT IN CAN BUS LINE 
    1. Measure the resistance according to the value(s) in the table below.
      GTY921293Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3

      Standard Resistance

      Tester Connection Condition Specified Condition
      H56-6 (CANH) - H56-14 (CANL) Cable disconnected from negative (-) battery terminal 54 Ω or higher
      H56-6 (CANH) - H56-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      H56-14 (CANL) - H56-4 (CG)
      H56-6 (CANH) - H56-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      H56-14 (CANL) - H56-16 (BAT)

      HINT: 

      If the resistance between CANH and CANL is not as specified, a connector may have been loose or disconnected during inspection. If a connector is loose or disconnected, connect it and perform the inspection again.

      Result

      Result
      OK
      NG

    Result: 

    NG 

    See step  9

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT) 
    1. Disconnect the H59 central gateway ECU (network gateway ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY889548Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Central Gateway ECU (Network Gateway ECU))

      Standard Resistance

      Tester Connection Condition Specified Condition
      H59-10 (GND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω

      Result

      Result 
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT) 

    Result: 

    OK 

    See step  6

  6. CHECK VEHICLE TYPE 
    1. Check vehicle type.

      Result

      Result Proceed to
      w/ Stop and Start System A
      w/o Stop and Start System B

    Result: 

    B 

    See step  10

    Result: 

    A 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Reconnect the cable to the negative (-) battery terminal.
    2. Measure the voltage according to the value(s) in the table below.
      GTY889549Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Central Gateway ECU (Network Gateway ECU))

      Standard Voltage

      Tester Connection Condition Specified Condition
      H59-1 (BATT) - Body ground Always 11 to 14 V
      H59-2 (ACC) - Body ground Ignition switch ACC 11 to 14 V
      H59-11 (IG1) - Body ground Ignition switch ON 11 to 14 V
      H59-12 (IG2) - Body ground Ignition switch ON 11 to 14 V

      Result

      Result 
      OK
      NG

    Result: 

    OK 

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 

    Refer to REMOVAL [12/2019 - 11/2023]

    Result: 

    NG 

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

    Refer to Backup Boost Converter Circuit [12/2019 - 10/2022] , or refer to Backup Boost Converter Circuit [10/2022 - 11/2023]

  8. CHECK FOR OPEN IN CAN BUS LINE (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - DLC3) 
    1. Disconnect the H59 central gateway ECU (network gateway ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY839163Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3 - -
      *a Front view of wire harness connector
      (to Central Gateway ECU (Network Gateway ECU))      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      H59-14 (CA6H) - H56-6 (CANH) Cable disconnected from negative (-) battery terminal Below 1 Ω
      H59-5 (CA6L) - H56-14 (CANL)

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 

    Refer to REMOVAL [12/2019 - 11/2023]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - DLC3) 

  9. CHECK SHORT IN CAN BUS LINE 
    1. Disconnect the H59 central gateway ECU (network gateway ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY921293Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3

      Standard Resistance

      Tester Connection Condition Specified Condition
      H56-6 (CANH) - H56-14 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher
      H56-6 (CANH) - H56-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      H56-14 (CANL) - H56-4 (CG)
      H56-6 (CANH) - H56-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      H56-14 (CANL) - H56-16 (BAT)

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 

    Refer to REMOVAL [12/2019 - 11/2023]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (DLC3 - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)) 

  10. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Reconnect the cable to the negative (-) battery terminal.
    2. Measure the voltage according to the value(s) in the table below.
      GTY889549Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Central Gateway ECU (Network Gateway ECU))

      Standard Voltage

      Tester Connection Condition Specified Condition
      H59-1 (BATT) - Body ground Always 11 to 14 V
      H59-2 (ACC) - Body ground Ignition switch ACC 11 to 14 V
      H59-11 (IG1) - Body ground Ignition switch ON 11 to 14 V
      H59-12 (IG2) - Body ground Ignition switch ON 11 to 14 V

      Result

      Result 
      OK
      NG

    Result: 

    OK 

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 

    Refer to REMOVAL [12/2019 - 11/2023]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

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