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Home >> Toyota >> 2016 >> Avalon XLE >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication System (W/O Central Gateway Ecu) - Diagnostic Codes & Circuit Tests - (Except Hybrid) >> CAN COMMUNICATION SYSTEM (W/O Central Gateway ECU) >> Circuit Tests >> Check CAN Bus Lines for Short Circuit [10/2014 - 10/2015] >> Procedure

Check CAN Bus Lines for Short Circuit [10/2014 - 10/2015]: Procedure

  1. CHECK FOR SHORT IN CAN BUS LINES (DLC3 BRANCH LINE) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the D75 DLC3 branch line connector.
      GTY565007Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to No. 1 CAN Junction Connector)
      *b to DLC3
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.
    3. Measure the resistance according to the value (s) in the table below.
      GTY605499Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 DLC3

      Standard Resistance

      Tester Connection Condition Specified Condition
      D28-6 (CANH) - D28-14 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher

    NG 

    REPAIR OR REPLACE CAN BRANCH LINE CONNECTED TO DLC3 

    OK 

    See step  2

  2. CHECK FOR SHORT IN CAN BUS LINES (BRANCH LINE) 
    1. Reconnect the D75 DLC3 branch line connector.
    2. Connect the probes of an ohmmeter to terminals 6 (CANH) and 14 (CANL) of the DLC3.
      GTY605499Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 DLC3
    3. While observing the resistance value shown on the tester, disconnect the D74, D76, D77, D79, D80, D82, D83, D84 and D85 connectors from the No. 1 CAN junction connector or No. 2 CAN junction connector one by one until the resistance becomes normal (between 54 and 69 Ω).

      HINT: 

      Disconnect the branch line connectors other than those of the DLC3.

      GTY550785Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *A for Navigation Receiver Type *B for Radio and Display Type
      *C w/ Pre-collision System and/or Blind Spot Monitor System - -
      *1 Power Steering ECU Assembly *2 Steering Sensor
      *3 DLC3 *4 Main Body ECU (Multiplex Network Body ECU)
      *5 Combination Meter Assembly *6 Airbag ECU Assembly
      *7 Skid Control ECU (Brake Actuator Assembly) *8 Network Gateway ECU
      *9 Navigation ECU Sub-assembly *10 Radio and Display Receiver Assembly
      *11 Certification ECU (Smart Key ECU Assembly) *12 ECM
      *13 Air Conditioning Amplifier Assembly *14 No. 1 CAN Junction Connector
      *15 No. 2 CAN Junction Connector - -
      GTY558885Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (No. 1 CAN Junction Connector)      		 - -
      WIRING COLOR

      No. 1 CAN Junction Connector Side Code Color (CANH Side) Color (CANL Side)
      Airbag ECU assembly D80 LG W
      Combination meter assembly D73 R W
      Main body ECU (Multiplex network body ECU) D74 P W
      DLC3 D75 L W
      Steering sensor D76 V W
      Power steering ECU assembly D77 G W
      CAN main bus line (bus line connecting No. 1 CAN junction connector and No. 2 CAN junction connector) D72 B W
      GTY601017Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Component without 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. 1 CAN junction connector and No. 2 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
      • Navigation ECU sub-assembly*1
      • Radio and display receiver assembly*2
      		 D84 R W
      Network gateway ECU*3 D85 SB W
      Skid control ECU (Brake actuator assembly) D82 GR W
      • *1: for Navigation receiver type
      • *2: for Radio and display type
      • *3: w/ Pre-collision system and/or blind spot monitor system
      NOTE:

      Do not reconnect the disconnected connectors until this inspection is complete because there may be a short in 2 or more branch lines.

      Result

      Symptom 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
    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.

        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 wiring harnesses, and to make future maintenance easier.

    B 

    See step  7

    A 

    See step  3

  3. CHECK FOR SHORT IN CAN BUS LINES (COMBINATION METER ASSEMBLY MAIN BUS LINE) 
    1. Disconnect the D73 combination meter assembly main bus line connector.
      GTY583815Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to No. 1 CAN Junction Connector)
      *b to Combination Meter Assembly
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.
    2. Measure the resistance according to the value (s) in the table below.
      GTY605499Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 DLC3

      Standard Resistance

      Tester Connection Condition Specified Condition
      D28-6 (CANH) - D28-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Symptom Proceed to
      The resistance is still below 54 Ω when the combination meter assembly connector is disconnected. (There are no shorts in the combination meter assembly or between its main bus lines.) A
      The resistance falls within the specified range (between 108 and 132 Ω) (the other terminating resistor is normal) when the combination meter assembly connector is disconnected. (There is a short in the combination meter assembly or between its main bus lines.) B

    B 

    See step  8

    A 

    See step  4

  4. CHECK FOR SHORT IN CAN BUS LINES (ECM MAIN BUS LINE) 
    1. Disconnect the D81 ECM main bus line connector.
      GTY552479Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to No. 2 CAN Junction Connector)
      *b to ECM
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.
    2. Measure the resistance according to the value (s) in the table below.
      GTY605499Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 DLC3

      Standard Resistance

      Tester Connection Condition Specified Condition
      D28-6 (CANH) - D28-14 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher

      HINT: 

      Measure the resistance with the combination meter assembly main bus line connector (D73) disconnected.

      Result

      Symptom Proceed to
      The resistance is still below 1 MΩ when the ECM connector is disconnected. (There are no shorts in the ECM or between its main bus lines.) A
      The resistance becomes 1 MΩ or more when the ECM connector is disconnected. (There is a short in the ECM or between its main bus lines.) B

    B 

    See step  9

    A 

    See step  5

  5. CHECK FOR SHORT IN CAN BUS LINES (NO. 1 CAN J/C) 
    1. Disconnect the D72 CAN main bus line connector.
      GTY562093Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to No. 1 CAN Junction Connector)
      *b to No. 2 CAN Junction Connector
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.
    2. Measure the resistance according to the value (s) in the table below.
      GTY605499Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 DLC3

      Standard Resistance

      Tester Connection Condition Specified Condition
      D28-6 (CANH) - D28-14 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher

    NG 

    REPLACE NO. 1 CAN JUNCTION CONNECTOR 

    OK 

    See step  6

  6. CHECK FOR SHORT IN CAN BUS LINES (NO. 1 CAN J/C - NO. 2 CAN J/C) 
    1. Reconnect the D72 CAN main bus line connector.
    2. Disconnect the D78 CAN main bus line connector.
      GTY570517Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to No. 2 CAN Junction Connector)
      *b to No. 1 CAN Junction Connector
      NOTE:
      • Before disconnecting the connector, make a note of where it is connected.
      • Reconnect the connector to its original position.
    3. Measure the resistance according to the value (s) in the table below.
      GTY605499Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 DLC3

      Standard Resistance

      Tester Connection Condition Specified Condition
      D28-6 (CANH) - D28-14 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher

    OK 

    REPLACE NO. 2 CAN JUNCTION CONNECTOR 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES (NO. 1 CAN J/C - NO. 2 CAN J/C) 

  7. CHECK FOR SHORT IN CAN BUS 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).
    2. Disconnect the connector that includes the DLC3 connected CAN lines (such as CANH and CANL) from the ECU (or sensor) to which the short-circuited branch line is connected (Refer to TERMINALS OF ECU [10/2014 - 10/2015] ).
    3. Measure the resistance according to the value (s) in the table below.
      GTY605499Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 DLC3

      Standard Resistance

      Tester Connection Condition Specified Condition
      D28-6 (CANH) - D28-14 (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 (or sensor), there may be a short in the ECU (or sensor).

    OK 

    REPLACE CORRESPONDING ECU OR SENSOR 

    NG 

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINES OR CONNECTOR 

  8. CHECK FOR SHORT IN CAN BUS LINES (COMBINATION METER ASSEMBLY) 
    1. Reconnect the D73 combination meter assembly main bus line connector.
    2. Disconnect the D9 combination meter assembly connector.
    3. Measure the resistance according to the value (s) in the table below.
      GTY605499Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 DLC3

      Standard Resistance

      Tester Connection Condition Specified Condition
      D28-6 (CANH) - D28-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      HINT: 

      If the resistance becomes normal (between 108 to 132 Ω) when the connector is disconnected, there may be a short in the combination meter assembly.

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [10/2014 - ] )

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES (COMBINATION METER ASSEMBLY MAIN LINES) 

  9. CHECK FOR SHORT IN CAN BUS LINES (ECM) 
    1. Reconnect the D81 ECM main bus line connector.
    2. Disconnect the A18 ECM connector.
    3. Measure the resistance according to the value (s) in the table below.
      GTY605499Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 DLC3

      Standard Resistance

      Tester Connection Condition Specified Condition
      D28-6 (CANH) - D28-14 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher

      HINT: 

      • Measure the resistance with the combination meter assembly main bus line connector (D73) disconnected.
      • If the resistance changes to 1 MΩ or more when the connector is disconnected, there may be a short in the ECM.

    OK 

    REPLACE ECM 

    Refer to REMOVAL [10/2014 - ] )

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINES (ECM MAIN LINES) 

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