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Home >> Toyota >> 2016 >> Avalon XLE >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication System (W/ Central Gateway Ecu) - Diagnostic Codes - Circuit & Symptom Tests - (Except Hybrid) >> CAN COMMUNICATION SYSTEM (w/ Central Gateway ECU) >> Symptom Tests >> Open in Bus 2 Main Bus Line [10/2015 - ] >> Procedure

Open in Bus 2 Main Bus Line [10/2015 - ]: Procedure

  1. CHECK FOR OPEN IN CAN BUS LINES (CENTRAL GATEWAY ECU BRANCH LINE) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the D85 No. 2 CAN junction connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D127-18 (CA4H) - D127-17 (CA4L) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      GTY542013Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Central Gateway ECU)

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  2

  2. CHECK FOR OPEN IN CAN BUS LINES (ECM) 
    1. Reconnect the D85 No. 2 CAN junction connectors.
    2. Disconnect the A18 ECM connector.
      GTY572930Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to ECM)
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A18-13 (CANH) - A18-26 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [10/2014 - ] 

    Result: 

    NG 

    See step  3

  3. CHECK FOR OPEN IN CAN BUS LINES (COMBINATION METER ASSEMBLY) 
    1. Reconnect the A18 ECM connector.
    2. Disconnect the D9 combination meter assembly connector.
      GTY539425Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Combination Meter Assembly)
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D9-16 (CANH) - D9-15 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2014 - ] 

    Result: 

    NG 

    See step  4

  4. CHECK FOR OPEN IN CAN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR) 
    1. Reconnect the D9 combination meter assembly connector.
    2. Disconnect the D73 and D72 No. 1 CAN junction connectors.
    3. Measure the resistance according to the value(s) in the table below.
      GTY566580Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to No. 1 CAN Junction Connector)
      *b to No. 2 CAN Junction Connector
      *c to Combination Meter Assembly

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      D73-1 (CANH) - D73-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Combination meter assembly
      D72-1 (CANH) - D72-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction connector
      WIRING COLOR:

      Code Color (CANH Side) Color (CANL Side) Connected to
      D73 R W Combination meter assembly
      D72 B W No. 2 CAN junction connector

      HINT: 

      • Connectors that connect to the CAN junction connector can be distinguished by the color of their CAN bus lines.
      • Reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wire harnesses, and to make future maintenance easier.
      Result  Proceed to
      OK A
      NG (Combination meter assembly main line) B
      NG (No. 2 CAN junction connector main line) C

    Result: 

    A 

    REPLACE NO. 1 CAN JUNCTION CONNECTOR 

    Result: 

    B 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY) 

    Result: 

    C 

    See step  6

  5. CHECK FOR OPEN IN CAN BUS LINES (CENTRAL GATEWAY ECU) 
    1. Reconnect the D85 No. 2 CAN junction connectors.
    2. Disconnect the D127 central gateway ECU connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY546649Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Central Gateway ECU)

      Standard Resistance

      Tester Connection Condition Specified Condition
      D127-18 (CA4H) - D127-17 (CA4L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

    Result: 

    OK 

    REPLACE CENTRAL GATEWAY ECU. Refer to  REMOVAL [10/2015 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH BUS LINE CONNECTED TO CENTRAL GATEWAY ECU 

  6. CHECK FOR OPEN IN CAN BUS LINES (NO. 2 CAN JUNCTION CONNECTOR) 
    1. Reconnect the D73 and D72 No. 1 CAN junction connectors.
    2. Disconnect the D78 and D81 No. 2 CAN junction connectors.
    3. Measure the resistance according to the value(s) in the table below.
      GTY558628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (No. 2 CAN Junction Connector)
      *b to No. 1 CAN Junction Connector
      *c to ECM

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      D78-1 (CANH) - D78-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 1 CAN junction connector
      D81-1 (CANH) - D81-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω ECM
      WIRING COLOR:

      Code Color (CANH Side) Color (CANL Side) Connected to
      D81 P W ECM
      D78 B W No. 1 CAN Junction Connector

      HINT: 

      • Connectors that connect to the CAN junction connector can be distinguished by the color of their CAN bus lines.
      • Reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wire harnesses, and to make future maintenance easier.
      Result  Proceed to
      OK A
      NG (ECM main line) B
      NG (No. 1 CAN junction connector main line) C

    Result: 

    A 

    REPLACE NO. 2 CAN JUNCTION CONNECTOR 

    Result: 

    B 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - ECM) 

    Result: 

    C 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR) 

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