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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) >> Symptom Tests >> Check Bus 3 Line for Short to +B [10/2015 - ] >> Procedure

Check Bus 3 Line for Short to +B [10/2015 - ]: Procedure

  1. CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 7 CAN JUNCTION CONNECTOR) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the D132 No. 7 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY586971Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3 - -
      *a Front view of wire harness connector
      (to No. 7 CAN Junction Connector)      		 *b to Central Gateway ECU (CA3H and CA3L terminal)
      *c to Central Gateway ECU (CAYH and CAYL Terminal) *d to Navigation ECU Sub-assembly
      (for Navigation Receiver Type)
      *e to Radio and Display Receiver Assembly
      (for Radio and Display Type)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      D132-9 (CANH) - D28-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Central gateway ECU (CA3H and CA3L terminal)
      D132-20 (CANL) - D28-16 (BAT)
      D132-10 (CANH) - D28-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Central gateway ECU (CAYH and CAYL terminal)
      D132-21 (CANL) - D28-16 (BAT)
      D132-11 (CANH) - D28-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Navigation receiver assembly*1
      D132-22 (CANL) - D28-16 (BAT)
      D132-11 (CANH) - D28-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Radio and display receiver assembly*2
      D132-22 (CANL) - D28-16 (BAT)
      • *1: for Navigation Receiver Type
      • *2: for Radio and Display Type
        Proceed to
      OK A
      NG (Central gateway ECU (CA3H and CA3L terminal) main line) B
      NG (Central gateway ECU (CAYH and CAYL terminal) main line) C
      NG (ECU or sensor branch line) D

    Result: 

    A 

    REPLACE NO. 7 CAN JUNCTION CONNECTOR 

    Result: 

    C 

    See step  3

    Result: 

    D 

    See step  4

    Result: 

    B 

    See step  2

  2. CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 7 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU) 
    1. Reconnect the D132 No. 7 CAN junction connector.
    2. Disconnect the D127 central gateway ECU connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY599294Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Central Gateway ECU)

      Standard Resistance

      Tester Connection Condition Specified Condition
      D127-6 (CA3H) - D127-1 (BATT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      D127-21 (CA3L) - D127-1 (BATT)

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU) 

  3. CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 7 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU) 
    1. Reconnect the D132 No. 7 CAN junction connector.
    2. Disconnect the D127 central gateway ECU connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY546652Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Central Gateway ECU)

      Standard Resistance

      Tester Connection Condition Specified Condition
      D127-19 (CAYH) - D127-1 (BATT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      D127-20 (CAYL) - D127-1 (BATT)

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU) 

  4. CHECK FOR SHORT TO +B IN CAN BUS LINE (ECU, SENSOR) 
    1. Reconnect the D132 No. 7 CAN junction connector.
    2. Disconnect the ECU or sensor connected to the CAN bus line that is shorted to +B.

      HINT: 

      If the ECU or sensor has multiple connectors, disconnect the connector that includes the CAN bus lines. To determine the ECU or sensor that is connected to the shorted bus line:

      Refer to TERMINALS OF ECU [10/2015 - ]

    3. Measure the resistance according to the value(s) in the table below.
      GTY542012Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Central Gateway ECU)

      Standard Resistance

      Tester Connection Condition Specified Condition
      D127-6 (CA3H) - D127-1 (BATT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      D127-21 (CA3L) - D127-1 (BATT)

      HINT: 

      If the resistance changes to 6 kΩ or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.

    Result: 

    OK 

    REPLACE CORRESPONDING ECU OR SENSOR 

    Result: 

    NG 

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BUS LINE OR CONNECTOR 

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