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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 >> Check Bus 2 Line for Short to +B [10/2015 - ] >> Procedure

Check Bus 2 Line for Short to +B [10/2015 - ]: Procedure

  1. CHECK FOR SHORT TO +B IN CAN BUS LINE (ECM - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the D81 wire harness connector.
      GTY606661Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3
      *a Rear view of wire harness connector
      (to No. 2 CAN Junction Connector)
      *b to ECM
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D81-1 (CANH) - D28-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      D81-2 (CANL) - D28-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  2

  2. CHECK FOR SHORT TO +B IN CAN BUS LINE (BRANCH LINE) 
    1. Reconnect the D81 wire harness connector.
    2. Connect a tester probe to terminal 1 (CANH) or terminal 2 (CANL) of the No. 2 CAN junction connector and connect the other tester probe to terminal 16 (BATT) of the DLC3.
      GTY608503Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3
      *a Component with harness connected
      (No. 2 CAN Junction Connector)
    3. While observing the resistance value shown on the tester, disconnect connectors (D79, D82, D83 and D85) from the No. 2 CAN junction connector or (D74, D76, D77, D80 and D129) from the No. 1 CAN junction connector one by one until the resistance becomes normal (6 kΩ or higher).
      GTY556137Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 2 CAN Junction Connector)      		 - -
      WIRING COLOR:

      No. 2 CAN Junction Connector Side Code Color (CANH Side) Color (CANL Side)
      Skid control ECU (brake actuator assembly) D82 GR W
      CAN main bus line (bus line connecting No. 2 CAN junction connector and No. 1 CAN junction connector) D78 B W
      Certification ECU (smart key ECU assembly) D83 L W
      Air conditioning amplifier assembly D79 BR W
      ECM D81 P W
      Central gateway ECU D85 SB W
      GTY562426Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 1 CAN Junction Connector)      		 - -
      WIRING COLOR:

      No. 1 CAN Junction Connector Side Code Color (CANH Side) Color (CANL Side)
      Power steering ECU assembly D77 G W
      Airbag ECU assembly D80 LG W
      Tire pressure warning ECU and receiver D129 SB W
      Combination meter assembly D73 R W
      Main body ECU (multiplex network body ECU) D74 P W
      Steering sensor D76 V W
      CAN main bus line (bus line connecting No. 2 CAN junction connector and No. 1 CAN junction connector) D72 B W
      NOTE:
      • Do not reconnect the disconnected connectors until this inspection is complete because there may be a short to +B in 2 or more CAN bus lines.
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

      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.
    4. When there is a short to +B in one or more of the bus lines that connect to an ECU or sensor:
      1. Reconnect all of the connectors to the CAN junction connector, except for the one that was disconnected last (the bus line that is shorted to +B). Check that the resistance shown on the tester is normal (6 kΩ or higher) to confirm that there is a short to +B in the one bus line only.
      Proceed to
    The resistance is still 6 kΩ or higher when all the specified connectors are disconnected from the CAN junction connector. (There is a short to +B in the No. 2 CAN junction connector or No. 1 CAN junction connector) A
    The resistance becomes normal (6 kΩ or higher) when a connector is disconnected from the CAN junction connector. (There is a short to +B in one of the areas that relate to the disconnected bus lines) B

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  3

  3. CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 2 CAN JUNCTION CONNECTOR) 
    1. Disconnect the D78 wire harness connector.
      GTY608503Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3
      *a Component with harness connected
      (No. 2 CAN Junction Connector)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D81-1 (CANH) - D28-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      D81-2 (CANL) - D28-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

    Result: 

    NG 

    REPLACE NO. 2 CAN JUNCTION CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 2 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR) 
    1. Disconnect the D72 wire harness connector.
      GTY608503Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3
      *a Component with harness connected
      (No. 2 CAN Junction Connector)
    2. Reconnect the D78 wire harness connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D81-1 (CANH) - D28-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      D81-2 (CANL) - D28-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

    Result: 

    NG 

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

    Result: 

    OK 

    See step  5

  5. CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR) 
    1. Reconnect the D72 wire harness connector.
      GTY608503Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3
      *a Component with harness connected
      (No. 2 CAN Junction Connector)
    2. Disconnect the D73 wire harness connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D81-1 (CANH) - D28-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      D81-2 (CANL) - D28-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

    Result: 

    NG 

    REPLACE NO. 1 CAN JUNCTION CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK FOR SHORT TO +B IN CAN BUS LINE (COMBINATION METER ASSEMBLY - NO. 1 CAN JUNCTION CONNECTOR) 
    1. Reconnect the D73 wire harness connector.
      GTY608503Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3
      *a Component with harness connected
      (No. 2 CAN Junction Connector)
    2. Disconnect the D9 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D81-1 (CANH) - D28-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      D81-2 (CANL) - D28-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

    Result: 

    OK 

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

    Result: 

    NG 

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

  7. CHECK FOR SHORT TO +B IN CAN BUS LINE (ECU, SENSOR) 
    1. Reconnect the connector for the short-circuited branch line to the CAN junction connector (the connector that caused the bus line resistance to become normal (6 kΩ or higher) when it was disconnected).
      GTY561482Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 2 CAN Junction Connector)
    2. Disconnect the connector that includes terminals CANH and CANL from the ECU to which the short-circuited branch line is connected.

      Refer to TERMINALS OF ECU [10/2015 - ]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      D81-1 (CANH) - D81-2 (CANL) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      HINT: 

      If the resistance becomes normal (6 kΩ or higher) when the connector is disconnected from the ECU, there may be a short in the ECU.

    Result: 

    OK 

    REPLACE CORRESPONDING ECU OR SENSOR 

    Result: 

    NG 

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BUS LINE OR CONNECTOR 

  8. CHECK FOR SHORT TO +B IN CAN BUS LINE (ECM - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Disconnect the A18 ECM connector.
      GTY597678Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3
      *a Component with harness connected
      (to No. 2 CAN Junction Connector)
      *b to ECM
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D81-1 (CANH) - D28-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      D81-2 (CANL) - D28-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

    Result: 

    OK 

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

    Result: 

    NG 

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

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