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Home >> Toyota >> 2022 >> Corolla XLE >> Repair and Diagnosis >> External Pages >> Different car >> Section 444 (Can Communication System (Except HEV) (Early 2023, Except TMC) - Circuit Tests (1 Of 2) & Diagnostic Codes) >> CAN COMMUNICATION SYSTEM (for Gasoline Model except TMC Made) >> Open in Bus 1 Main Bus Line [09/2022 - 11/2022] >> Procedure

Open in Bus 1 Main Bus Line [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 VEHICLE TYPE 
    1. Check vehicle type.

      Result

      Result Proceed to
      w/ Blind Spot Monitor System A
      w/o Blind Spot Monitor System B

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  2

  2. CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the I91 No. 1 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY1119079Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 1 CAN Junction Connector)      		 *b to Central Gateway ECU (Network Gateway ECU)
      *c to No. 7 CAN Junction Connector - -

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      I91-1 (CANH) - I91-7 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Central gateway ECU (network gateway ECU)
      I91-6 (CANH) - I91-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 7 CAN junction connector

      Result

      Result Proceed to
      OK A
      NG (Line to central gateway ECU (network gateway ECU)) B
      NG (Line to No. 7 CAN junction connector) C

    Result: 

    A 

    REPLACE NO. 1 CAN JUNCTION CONNECTOR 

    Result: 

    C 

    See step  4

    Result: 

    B 

    See step  3

  3. CHECK FOR OPEN IN CAN MAIN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 1 CAN JUNCTION CONNECTOR) 
    1. Reconnect the I91 No. 1 CAN junction connector.
    2. Disconnect the I53 central gateway ECU (network gateway ECU) connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY852967Courtesy 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
      I53-23 (CA1H) - I53-8 (CA1L) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      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 CAN MAIN BUS LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 1 CAN JUNCTION CONNECTOR) 

  4. CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 7 CAN JUNCTION CONNECTOR) 
    1. Reconnect the I91 No. 1 CAN junction connector.
    2. Disconnect the O121 No. 7 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY897391Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 7 CAN Junction Connector)      		 *b to No. 1 CAN Junction Connector
      *c to CAN Junction Terminal - -

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      O121-2 (CANH) - O121-13 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 1 CAN junction connector
      O121-3 (CANH) - O121-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω CAN junction terminal

      Result

      Result Proceed to
      OK A
      NG (Line to No. 1 CAN junction connector) B
      NG (Line to CAN junction terminal) C

    Result: 

    A 

    REPLACE NO. 7 CAN JUNCTION CONNECTOR 

    Result: 

    B 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR) 

    Result: 

    C 

    See step  5

  5. CHECK FOR OPEN IN CAN MAIN BUS LINES (CAN JUNCTION TERMINAL - NO. 7 CAN JUNCTION CONNECTOR) 
    1. Reconnect the O121 No. 7 CAN junction connector.
    2. Disconnect the O95 CAN junction terminal connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY882516Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to CAN Junction Terminal)

      Standard Resistance

      Tester Connection Condition Specified Condition
      O95-3 (CANH) - O95-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE CAN JUNCTION TERMINAL 

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CAN JUNCTION TERMINAL - NO. 7 CAN JUNCTION CONNECTOR) 

  6. CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the I91 No. 1 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY863076Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 1 CAN Junction Connector)      		 *b to Central Gateway ECU (Network Gateway ECU)

      Standard Resistance

      Tester Connection Condition Specified Condition
      I91-1 (CANH) - I91-7 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      I91-6 (CANH) - I91-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 1 CAN JUNCTION CONNECTOR 

    Result: 

    NG 

    See step  7

  7. CHECK FOR OPEN IN CAN MAIN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 1 CAN JUNCTION CONNECTOR) 
    1. Reconnect the I91 No. 1 CAN junction connector.
    2. Disconnect the I53 central gateway ECU (network gateway ECU) connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY929447Courtesy 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
      I53-23 (CA1H) - I53-9 (CAXH) Cable disconnected from negative (-) battery terminal Below 1 Ω
      I53-8 (CA1L) - I53-24 (CAXL) Cable disconnected from negative (-) battery terminal Below 1 Ω

      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 CAN MAIN BUS LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 1 CAN JUNCTION CONNECTOR) 

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