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Home >> Toyota >> 2018 >> 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) >> Circuit Tests >> Check Bus 2 Lines for Short Circuit [10/2015 - ] >> Procedure

Check Bus 2 Lines for Short Circuit [10/2015 - ]: Procedure

  1. CHECK FOR SHORT IN BUS 2 LINES (CENTRAL GATEWAY ECU - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the D85 wire harness connector.
      GTY574451Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to No. 2 CAN Junction Connector)
      *b to Central Gateway ECU
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D85-1 (CANH) - D85-2 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω 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  10

    Result: 

    OK 

    See step  2

  2. CHECK FOR SHORT IN BUS 2 LINES (BRANCH LINE) 
    1. Reconnect the D85 wire harness connector.
    2. Connect the probes of an electrical tester to terminals 1 (CANH) and 2 (CANL) of the central gateway ECU branch line harness connector.
      GTY561481Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 2 CAN Junction Connector)
    3. While observing the resistance value shown on the tester, disconnect connectors (D79, D82 and D83) 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 (between 54 and 69 Ω).
      GTY556133Courtesy 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)
      CAN main bus line (bus line connecting No. 2 CAN junction connector and No. 1 CAN junction connector) D78 B W
      Air conditioning amplifier assembly D79 BR W
      ECM D81 P W
      Certification ECU (smart key ECU assembly) D83 L W
      Central gateway ECU D85 SB W
      Skid control ECU (brake actuator assembly) D82 GR W
      GTY562423Courtesy 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)
      CAN main bus line (bus line connecting No. 2 CAN junction connector and No. 1 CAN junction connector) D72 B W
      Power steering ECU assembly D77 G W
      Steering sensor D76 V W
      Main body ECU (multiplex network body ECU) D74 P W
      Combination meter assembly D73 R W
      Airbag ECU assembly D80 LG W
      Tire pressure warning ECU and receiver D129 SB W
      NOTE:
      • 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 in one or more of the branch lines:
      1. Reconnect all of the connectors to the CAN junction connector, except for the one that was disconnected last (the short-circuited bus line). Check that the resistance shown on the tester is normal (between 54 and 69 Ω) to confirm that there is a short in the one branch line only.
      Proceed to
    The resistance is still below 54 Ω when all the specified connectors are disconnected. (There are no shorts between a pair of branch lines.) A
    The resistance becomes normal (between 54 and 69 Ω) when a connector is disconnected. (There is a short between one or more pairs of branch lines.) B

    Result: 

    B 

    See step  9

    Result: 

    A 

    See step  3

  3. CHECK FOR SHORT IN BUS 2 LINES (NO. 2 CAN JUNCTION CONNECTOR) 
    1. Disconnect the D78 wire harness connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY561481Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 2 CAN Junction Connector)

      Standard Resistance

      Tester Connection Condition Specified Condition
      D85-1 (CANH) - D85-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  4

  4. CHECK FOR SHORT IN BUS 2 LINES (NO. 2 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR) 
    1. Reconnect the D78 wire harness connector.
    2. Disconnect the D72 wire harness connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY561481Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 2 CAN Junction Connector)

      Standard Resistance

      Tester Connection Condition Specified Condition
      D85-1 (CANH) - D85-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      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 LINES OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR) 

    Result: 

    OK 

    See step  5

  5. CHECK FOR SHORT IN BUS 2 LINES (NO. 1 CAN JUNCTION CONNECTOR) 
    1. Reconnect the D72 wire harness connector.
    2. Disconnect the D73 wire harness connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY561481Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 2 CAN Junction Connector)

      Standard Resistance

      Tester Connection Condition Specified Condition
      D85-1 (CANH) - D85-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      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 IN BUS 2 LINES (NO. 1 CAN JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY) 
    1. Reconnect the D73 wire harness connector.
    2. Disconnect the D9 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY561481Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (No. 2 CAN Junction Connector)

      Standard Resistance

      Tester Connection Condition Specified Condition
      D85-1 (CANH) - D85-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      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 LINES OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY) 

  7. CHECK FOR SHORT IN BUS 2 LINES (ECM - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Disconnect the D81 wire harness connector.
      GTY544243Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (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) - D81-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.

    Result: 

    OK 

    REPLACE NO. 2 CAN JUNCTION CONNECTOR 

    Result: 

    NG 

    See step  8

  8. CHECK FOR SHORT IN BUS 2 LINES (ECM - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Reconnect the D81 wire harness connector.
    2. Reconnect the D78 wire harness connector.
    3. Disconnect the A18 ECM connector.
    4. 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
      GTY572929Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to ECM)

    Result: 

    OK 

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

    Result: 

    NG 

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

  9. CHECK FOR SHORT IN BUS 2 LINES (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 (between 54 and 69 Ω) 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 54 to 69 Ω

      HINT: 

      If the resistance becomes normal (between 54 and 69 Ω) 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 BRANCH LINES OR CONNECTOR 

  10. CHECK FOR SHORT IN BUS 2 LINES (CENTRAL GATEWAY ECU - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Reconnect the D85 wire harness connector.
    2. Disconnect the D127 central gateway ECU connector.
    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 54 to 69 Ω
      GTY546650Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Central Gateway ECU)

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE CAN BUS BRANCH LINES OR CONNECTOR (CENTRAL GATEWAY ECU - NO. 2 CAN JUNCTION CONNECTOR) 

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