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Home >> Toyota >> 2020 >> Corolla XLE >> Repair and Diagnosis >> External Pages >> Different car >> Section 415 (Can Communication System (Except HEV) (Early 2023, TMC) - Circuit Tests (1 Of 4) & Diagnostic Codes) >> CAN COMMUNICATION SYSTEM (for Gasoline Model TMC Made) >> Check CAN Communication Connection [09/2022 - 11/2022] >> Procedure

Check CAN Communication Connection [09/2022 - 11/2022]: Procedure

WARNING: This page is about a different car, the 2023 Toyota GR Corolla and 2023 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  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) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      I26-16 (BAT) - Body ground Always 11 to 14 V
      GTY1116260Courtesy 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
      I26-4 (CG) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω

      Result

      Result
      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.
      GTY1116259Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3

      Standard Resistance

      Tester Connection Condition Specified Condition
      I26-6 (CANH) - I26-14 (CANL) Cable disconnected from negative (-) battery terminal Below 70 Ω

      Result

      Result
      OK
      NG

    Result: 

    NG 

    See step  7

    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.
      GTY1116258Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3

      Standard Resistance

      Tester Connection Condition Specified Condition
      I26-6 (CANH) - I26-14 (CANL) Cable disconnected from negative (-) battery terminal 54 Ω or higher
      I26-6 (CANH) - I26-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      I26-14 (CANL) - I26-4 (CG)
      I26-6 (CANH) - I26-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      I26-14 (CANL) - I26-16 (BAT)

      Result

      Result
      OK
      NG

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Disconnect the I173 central gateway ECU (network gateway ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY1115367Courtesy 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
      I173-22 (GND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
    3. Reconnect the cable to the negative (-) battery terminal.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      I173-1 (BATT) - Body ground Always 11 to 14 V
      I173-2 (ACC) - Body ground Ignition switch ACC 11 to 14 V
      I173-19 (IGP) - Body ground Ignition switch ON 11 to 14 V
      I173-20 (IGR) - 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 [09/2022 - 11/2022]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

  6. CHECK SHORT IN CAN BUS LINE 
    1. Disconnect the I173 central gateway ECU (network gateway ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY1115301Courtesy 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
      I173-16 (CA6H) - I173-17 (CA6L) Cable disconnected from negative (-) battery terminal 1 MΩ or higher
      I173-16 (CA6H) - I26-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      I173-17 (CA6L) - I26-4 (CG)
      I173-16 (CA6H) - I26-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      I173-17 (CA6L) - I26-16 (BAT)

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 

    Refer to REMOVAL [09/2022 - 11/2022]

    Result: 

    NG 

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

  7. CHECK FOR OPEN IN CAN BUS LINE (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - DLC3) 
    1. Disconnect the I173 central gateway ECU (network gateway ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY1115302Courtesy 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
      I173-16 (CA6H) - I26-6 (CANH) Cable disconnected from negative (-) battery terminal Below 1 Ω
      I173-17 (CA6L) - I26-14 (CANL)

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 

    Refer to REMOVAL [09/2022 - 11/2022]

    Result: 

    NG 

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

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