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Home >> Lexus >> 2011 >> ES 350 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Can Communication System (Diagnostic Codes & Circuit Tests) >> Can Communication System >> Circuit Tests >> Open in CAN Main Bus Line >> Procedure

Open in CAN Main Bus Line: Procedure

  1. CHECK DLC3 
    1. Turn the engine switch off.
    2. Measure the resistance according to the value(s) in the table below.
      Fig 1: Identifying DLC3 Connector Terminals
      GTY129521Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result

      Tester Connection Condition Specified Value Result
      E21-6 (CANH) -E21-14 (CANL) Engine switch off 108 to 132 Ω A
      E21-6 (CANH) - E21-14 (CANL) Engine switch off 132 Ω or higher B
      NOTE: When the measured value is 132 Ω or higher and a CAN communication system diagnostic trouble code is output, there may be a fault besides disconnection of the DLC3 branch wire. For that reason, troubleshooting should be performed again from "HOW TO PROCEED WITH TROUBLESHOOTING". Refer to HOW TO PROCEED WITH TROUBLESHOOTING after repairing the trouble area.

    B → REPAIR OR REPLACE DLC3 BRANCH WIRE OR CONNECTOR 

    A: Go to next step 

  2. CHECK FOR OPEN IN CAN NO. 1 BUS MAIN WIRE (COMBINATION METER MAIN BUS WIRE) 
    1. Disconnect CAN main bus wire connector E48 from the CAN No. 2 J/C "B" side (without earth terminal).
      Fig 2: Identifying CAN Main Bus Wire Connector Terminals
      GTY111467Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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.

      Standard resistance

      Tester Connection Condition Specified Value
      E48-1 (CANH) - E48-2 (CANL) Engine switch off 108 to 132 Ω

    NG → See step   7 

    OK: Go to next step 

  3. CHECK FOR OPEN IN CAN NO. 1 BUS MAIN WIRE (CAN NO. 2 J/C) 
    1. Reconnect CAN main bus wire connector E48 to the CAN No. 2 J/C "B" side (without earth terminal).
    2. Disconnect CAN main bus wire connector E42 from the CAN No. 2 J/C "A" side (with earth terminal).
      Fig 3: Identifying E42 Connector Terminals
      GTY257145Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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.

      Standard resistance

      Tester Connection Condition Specified Value
      E42-1 (CANH) - E42-2 (CANL) Engine switch off 108 to 132 Ω

    OK → REPLACE CAN NO. 2 J/C 

    NG: Go to next step 

  4. CHECK FOR OPEN IN CAN NO. 1 BUS MAIN WIRE (CAN NO. 2 J/C - CAN NO. 5 J/C) 
    1. Reconnect CAN main bus wire connector E42 to the CAN No. 2 J/C "A" side (with earth terminal).
    2. Disconnect CAN main bus wire connector E34 from the CAN No. 5 J/C (rear side of the vehicle).
      Fig 4: Disconnecting CAN Main Bus Wire Connector E34
      GTY112302Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Value
      E34-4 (CANH) - E34-10 (CANL) Engine switch off 108 to 132 Ω

    NG → REPAIR OR REPLACE CAN NO. 1 BUS MAIN WIRE OR CONNECTOR (CAN NO. 2 J/C - CAN NO. 5 J/C) 

    OK: Go to next step 

  5. CHECK FOR OPEN IN CAN NO. 1 BUS MAIN WIRE (CAN NO. 5 J/C) 
    1. Reconnect CAN main bus wire connector E34 to the CAN No. 5 J/C (rear side of the vehicle).
    2. Disconnect CAN main bus wire connector A26 from the CAN No. 5 J/C (front side of the vehicle).
      Fig 5: Disconnecting CAN Main Bus Wire Connector A26
      GTY284291Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Value
      A26-1 (CANH) - A26-7 (CANL) Engine switch off 108 to 132 Ω

    OK → REPLACE CAN NO. 5 J/C 

    NG: Go to next step 

  6. CHECK FOR OPEN IN CAN NO. 1 BUS MAIN WIRE (ECM CAN MAIN BUS LINE) 
    1. Reconnect CAN main bus wire connector A26 to the CAN No. 5 J/C (front side of the vehicle).
    2. Disconnect the ECM connector.
      Fig 6: Identifying ECM Connector Terminals
      GTY125047Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Value
      A10-41 (CANH) - A10-49 (CANL) Engine switch off 108 to 132 Ω

    OK → See step   8 

    NG → REPAIR OR REPLACE CAN NO. 1 BUS MAIN WIRE OR CONNECTOR (CAN NO. 5 J/C - ECM) 

  7. CHECK FOR OPEN IN CAN NO. 1 BUS MAIN WIRE (COMBINATION METER - CAN NO. 2 J/C) 
    1. Reconnect CAN main bus wire connector E48 to the CAN No. 2 J/C B side (without earth terminal).
    2. Disconnect combination meter connector E19.
      Fig 7: Identifying Combination Meter Connector Terminals
      GTY132134Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Value
      E19-17 (CANH) - E19-18 (CANL) Engine switch off 108 to 132 Ω

    OK → See step   9 

    NG → REPAIR OR REPLACE CAN NO. 1 BUS MAIN WIRE OR CONNECTOR (CAN NO. 2 J/C - COMBINATION METER) 

  8. REPLACE ECM. Refer to  COMPONENTS 
  9. REPLACE COMBINATION METER. Refer to  COMPONENTS 
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