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Home >> Lexus >> 2017 >> ES 300h >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Can Communication System (W/ Central Gateway Ecu) (Diagnostics & Symptom Tests) >> CAN COMMUNICATION SYSTEM(w/ Central Gateway ECU) >> Open in Bus 2 Main Bus Line [07/2015 - ] >> Procedure

Open in Bus 2 Main Bus Line [07/2015 - ]: Procedure

  1. CHECK FOR OPEN IN CAN BUS LINES (CENTRAL GATEWAY ECU BRANCH LINE) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
      GTY616251Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H186-18 (CA4H) - H186-17 (CA4L) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Central Gateway ECU)
      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 central gateway ECU branch line. For that reason, troubleshooting should be performed again from How to Proceed with Troubleshooting after repairing the trouble area (See page . Refer to HOW TO PROCEED WITH TROUBLESHOOTING [07/2015 - ] ).

    Result:  NG

    NG 

    REPAIR OR REPLACE CAN BRANCH LINE CONNECTED TO CENTRAL GATEWAY ECU 

    Result:  OK

    OK 

    See step  2

  2. CHECK FOR OPEN IN CAN BUS LINES (ECM) 
    1. Disconnect the A22 ECM connector.
      GTY677749Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A22-13 (CANH) -A22-26 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to ECM)

    Result:  OK

    OK 

    REPLACE ECM 

    (See page . Refer to REMOVAL [07/2015 - ] )

    Result:  NG

    NG 

    See step  3

  3. CHECK FOR OPEN IN CAN BUS LINES (COMBINATION METER ASSEMBLY) 
    1. Reconnect the A22 ECM connector.
    2. Disconnect the H14 combination meter assembly connector.
      GTY632503Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H14-29 (CANH) - H14-30 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Combination Meter Assembly)

    Result:  OK

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    (See page . Refer to REMOVAL [07/2015 - ] )

    Result:  NG

    NG 

    See step  4

  4. CHECK FOR OPEN IN CAN BUS LINES (CAN J/C LH1) 
    1. Reconnect the H14 combination meter assembly connector.
    2. Disconnect the H192 CAN junction connector LH1.
      GTY643341Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      H192-8 (CANH) - H192-18 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Combination meter assembly
      H192-9 (CANH) - H192-19 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN junction connector RH1
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to CAN Junction Connector LH1)
      *b to Combination Meter Assembly
      *c to CAN Junction Connector RH1

      Result

      Result Proceed to
      OK A
      NG (Combination meter assembly main line) B
      NG (CAN junction connector RH1 main line) C

    Result:  A

    A 

    REPLACE CAN JUNCTION CONNECTOR LH1 

    Result:  B

    B 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH1 - COMBINATION METER ASSEMBLY) 

    Result:  C

    C 

    See step  5

  5. CHECK FOR OPEN IN CAN BUS LINES (CAN J/C RH1) 
    1. Reconnect the H192 CAN junction connector LH1.
    2. Disconnect the H122 CAN junction connector RH1.
    3. Disconnect the H125 CAN junction connector RH1.
      GTY661842Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to CAN junction Connector RH1)      		 *b to CAN junction Connector LH1
      *c to ECM - -
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Connected to
      H122-1 (CANH) - H122-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN junction connector LH1
      H125-1 (CANH) - H125-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω ECM

      Wiring Color

      Code Color (CANH Side) Color (CANL Side) Connected to
      H122 R W CAN junction connector LH1
      H125 B W ECM
      NOTE:
      • Before disconnecting the connectors, make a note of where they are connected.
      • Reconnect each connector to its original position.

      Result

      Result Proceed to
      OK A
      NG (CAN junction connector LH1 main line) B
      NG (ECM main line) C

    Result:  A

    A 

    REPLACE CAN JUNCTION CONNECTOR RH1 

    Result:  B

    B 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH1 - CAN J/C RH1) 

    Result:  C

    C 

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C RH1 - ECM) 

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