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Home >> Lexus >> 2008 >> IS 350 >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication >> Can Communication System >> Open in CAN Main Bus Line >> Inspection Procedure

Inspection Procedure

  1. CHECK DLC3 
    1. Turn the engine switch off.
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION CHART

      Tester Connection Condition Specified Value Result
      J21-6 (CANH) - J21-14 (CANL) Engine switch off 108 to 132 Ω A
      J21-6 (CANH) - J21-14 (CANL) Engine switch off 132 Ω or higher B
      Fig 1: Identifying DLC3 Connector Terminal
      G05828606Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: When the measured value is 132 Ω or more and a CAN communication system diagnostic trouble code 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" (See HOW TO PROCEED WITH TROUBLESHOOTING ) after repairing the trouble area.

      B: REPAIR OR REPLACE DLC3 BRANCH LINE OR CONNECTOR (CANH, CANL) 

      A: Go to Next Step 

  2. CHECK FOR OPEN IN CAN BUS MAIN WIRE (CAN BUS CHECK) 
    1. Perform "CAN Bus Check" using the Techstream (See DIAGNOSIS SYSTEM ).

      Result 

      RESULT CHART

      Specified Condition Proceed to
      "ENGINE and ECT" only are not displayed A
      "BODY/GATEWAY" only is not displayed B
      Others C

      B: Go to step   4 

      C: Go to step   7 

      A: Go to Next Step 

  3. CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM 
    1. Turn the engine switch off.
    2. Disconnect the ECM connector (A5).
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION CHART

      Tester Connection Condition Specified Value
      A5-2S (CANH) - A5-24 (CANL) Engine switch off 108 to 132 Ω
      Fig 2: Identifying ECM Connector A5
      G05828607Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (ECM - CAN LH J/C) 

      OK: REPLACE ECM 

  4. CHECK FOR OPEN IN CAN BUS MAIN WIRE (GATEWAY ECU - CAN LH J/C) 
    1. Turn the engine switch off.
    2. Disconnect the gateway ECU connector (J76).
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION CHART

      Tester Connection Condition Specified Value
      J76-17 (CA1H) - J76-18 (CA1L) Engine switch off 108 to 132 Ω
      Fig 3: Identifying Gateway ECU Connector J76
      G05828608Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: REPLACE GATEWAY ECU 

      NG: Go to Next Step 

  5. RECONNECT CONNECTOR 
    1. Reconnect the gateway ECU connector (J76).
  6. CHECK FOR OPEN IN CAN BUS MAIN WIRE (CAN RH J/C 
    1. Disconnect the CAN main bus line connector (J84) from the CAN RH J/C B side (without earth terminal).
      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 

      RESISTANCE SPECIFICATION CHART

      Tester Connection Condition Specified Value
      J84-1 (CANH) - J84-2 (CANL) Engine switch off 108 to 132 Ω
      Fig 4: Identifying CAN Main Bus Line Connector J84
      G05828609Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN RH J/C - GATEWAY ECU) 

      OK: REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN LH J/C - CAN RH J/C) 

  7. CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM - CAN LH J/C) 
    1. Turn the engine switch off.
    2. Disconnect the ECM connector (A5).
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION CHART

      Tester Connection Condition Specified Value
      A5-25 (CANH) - A5-24 (CANL) Engine switch off 108 to 132 Ω
      Fig 5: Identifying ECM Connector A5
      G05828610Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: REPLACE ECM 

      NG: Go to Next Step 

  8. RECONNECT CONNECTOR 
    1. Reconnect the ECM connector (A5).
  9. CHECK FOR OPEN IN CAN BUS MAIN WIRE (GATEWAY ECU - CAN LH J/C) 
    1. Disconnect the gateway ECU connector (J76).
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION CHART

      Tester Connection Condition Specified Value
      J76-17 (CA1H) - J76-18 (CA1L) Engine switch off 108 to 132 Ω
      Fig 6: Identifying Gateway ECU Connector J76
      G05828608Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPLACE GATEWAY ECU 

      NG: Go to Next Step 

  10. RECONNECT CONNECTOR 
    1. Reconnect the gateway ECU connector (J76).
  11. CHECK FOR OPEN IN CAN BUS MAIN WIRE (CAN RH J/C - GATEWAY ECU) 
    1. Disconnect the CAN main bus line connector (J84) from the CAN RH J/C B side (without earth terminal).
      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 

      RESISTANCE SPECIFICATION CHART

      Tester Connection Condition Specified Value
      J84-1 (CANH) - J84-2 (CANL) Engine switch off 108 to 132 Ω
      Fig 7: Identifying CAN Main Bus Line Connector J84
      G05828609Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN RH J/C - GATEWAY ECU) 

      OK: Go to Next Step 

  12. RECONNECT CONNECTOR 
    1. Reconnect the CAN main bus line connector (J84) to the CAN RH J/C B side (without earth terminal).
  13. CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM - CAN LH J/C) 
    1. Disconnect the CAN main bus line connector (J2) from the CAN LH J/C A side (with earth terminal).
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION CHART

      Tester Connection Condition Specified Value
      J2-1 (CANH) - J2-2 (CANL) Engine switch off 108 to 132 Ω
      Fig 8: Identifying CAN Main Bus Line Connector J2
      G05828613Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (ECM - CAN LH J/C) 

      OK: REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN LH J/C - CAN RH J/C) 

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