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Home >> Toyota >> 2014 >> Corolla LE >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Can Communication System - (W/O Central Gateway Ecu) - Diagnostics & Circuit Tests (2 Of 2) (Model Code: ZRE172) >> CAN COMMUNICATION SYSTEM (W/O Central Gateway ECU) >> Open in CAN Main Bus Line [08/2016 - ] >> Procedure
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Open in CAN Main Bus Line [08/2016 - ]: Procedure

  1. CHECK FOR OPEN IN CAN BUS LINES (DLC3 BRANCH LINE) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Measure the resistance according to the value(s) in the table below.
      GTY423132Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3

      Standard Resistance

      Tester Connection Condition Specified Condition
      E13-6 (CANH) - E13-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      NOTE:

      When the measured value is 133 Ω or higher and a CAN communication system DTC is output, there may be a fault besides disconnection of the DLC3 branch line. For that reason, troubleshooting should be performed again from How to Proceed with Troubleshooting after repairing the trouble area.

      Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2013 - ]

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH LINE CONNECTED TO DLC3 

    Result: 

    OK 

    See step  2

  2. CHECK FOR OPEN IN CAN BUS LINES (COMBINATION METER ASSEMBLY - NO. 3 CAN JUNCTION CONNECTOR) 
    1. Disconnect the E43 combination meter assembly connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY479884Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Combination Meter Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      E43-32 (CANH) - E43-31 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [08/2016 - ] 

    Result: 

    NG 

    See step  3

  3. CHECK FOR OPEN IN CAN BUS LINES (ECM - NO. 2 CAN JUNCTION CONNECTOR) 
    1. Reconnect the E43 combination meter assembly connector.
    2. Disconnect the A40 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY441531Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to ECM)

      Standard Resistance

      Tester Connection Condition Specified Condition
      A40-13 (CANH) - A40-26 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [08/2016 - ] 

    Result: 

    NG 

    See step  4

  4. CHECK FOR OPEN IN CAN BUS LINES (NO. 2 CAN JUNCTION CONNECTOR) 
    1. Reconnect the A40 ECM connector.
    2. Disconnect the A39 No. 2 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY427792Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 2 CAN Junction Connector)
      *b to No. 3 CAN Junction Connector
      *c to ECM

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      A39-4 (CANH) - A39-15 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 3 CAN junction connector
      A39-6 (CANH) - A39-17 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω ECM

      Result

      Result Proceed to
      OK A
      NG (ECM main lines) B
      NG (No. 3 CAN junction connector main lines) C

    Result: 

    A 

    REPLACE NO. 2 CAN JUNCTION CONNECTOR 

    Result: 

    B 

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

    Result: 

    C 

    See step  5

  5. CHECK FOR OPEN IN CAN BUS LINES (NO. 3 CAN JUNCTION CONNECTOR) 
    1. Reconnect the A39 No. 2 CAN junction connector.
    2. Disconnect the E55 No. 3 CAN junction connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY427793Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 3 CAN Junction Connector)
      *b to No. 2 CAN Junction Connector
      *c to Combination Meter Assembly

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      E55-1 (CANH) - E55-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction connector
      E55-4 (CANH) - E55-15 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Combination meter assembly

      Result

      Result Proceed to
      OK A
      NG (Combination meter assembly main lines) B
      NG (No. 2 CAN junction connector main lines) C

    Result: 

    A 

    REPLACE NO. 3 CAN JUNCTION CONNECTOR 

    Result: 

    B 

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (COMBINATION METER ASSEMBLY - NO. 3 CAN JUNCTION CONNECTOR) 

    Result: 

    C 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - NO. 3 CAN JUNCTION CONNECTOR) 

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