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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) >> ECM Communication Stop Mode [08/2016 - ] >> Procedure
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ECM Communication Stop Mode [08/2016 - ]: Procedure

  1. CHECK FOR OPEN IN CAN BUS LINES (ECM MAIN LINE) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the A40 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY441529Courtesy 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: 

    NG 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM MAIN LINE) 

    Result: 

    OK 

    See step  2

  2. CHECK ECM POWER SOURCE CIRCUIT 

    Refer to ECM POWER SOURCE CIRCUIT [08/2013 - ]

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

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