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Inspection Procedure

WARNING: This page is about a different car, the 2006 Lexus IS 350 and 2006 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DLC3 
    1. Turn the engine switch off.
    2. Measure the resistance according to the value(s) in DLC3 STANDARD RESISTANCE DESCRIPTION TABLE  .

      Standard resistance 

      DLC3 STANDARD RESISTANCE DESCRIPTION TABLE

      Tester Connection Condition Specified Value Result
      J21-6 (CANH) - J21-14 (CANL) Engine switch off 108 to 132 ohms A
      J21-6 (CANH) - J21-14 (CANL) Engine switch off 132 ohms or higher B
    Fig 1: Identifying DLC3 Connector Terminals
    G04057634Courtesy 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  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 MAIN BUS LINE (BUS CHECK) 
    1. Perform "Communication BUS CHECK" using the intelligent tester (See DIAGNOSIS SYSTEM  ).

    Result 

    FOR OPEN IN CAN MAIN BUS LINE (BUS CHECK)

    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 MAIN BUS LINE (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 STANDARD RESISTANCE DESCRIPTION TABLE  .

    Standard resistance 

    FOR OPEN IN CAN MAIN BUS LINE (ECM - CAN LH J/C)

    Tester Connection Condition Specified Value
    A5-25 (CANH) - A5-24 (CANL) Engine switch off 108 to 132 ohms
    Fig 2: Checking For Open In CAN Main BUS Line (ECM - CAN LH J/C)
    G04051969Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: REPLACE ECM 

  4. CHECK FOR OPEN IN CAN MAIN BUS LINE (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 FOR OPEN IN CAN MAIN BUS LINE (GATEWAY ECU - CAN LH J/C)  .

    Standard resistance 

    FOR OPEN IN CAN MAIN BUS LINE (GATEWAY ECU - CAN LH J/C)

    Tester Connection Condition Specified Value
    J76-17 (CA1H) - J76-18 (CA1L) Engine switch off 108 to 132 ohms
    Fig 3: Checking Open In CAN Main BUS Line (Gateway ECU - CAN LH J/C)
    G04051970Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE GATEWAY ECU 

    NG: Go to next step. 

  5. RECONNECT CONNECTOR 
    1. Reconnect the gateway ECU connector (J76).

    Go to next step. 

  6. CHECK FOR OPEN IN CAN MAIN BUS LINE (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 FOR OPEN IN CAN MAIN BUS LINE (CAN RH J/C - GATEWAY ECU)  .

    Standard resistance 

    FOR OPEN IN CAN MAIN BUS LINE (CAN RH J/C - GATEWAY ECU)

    Tester Connection Condition Specified Value
    J84-1 (CANH) - J84-2 (CANL) Engine switch off 108 to 132 ohms
    Fig 4: Checking For Open In CAN BUS Main Wire (CAN RH J/C - Gateway ECU)
    G04051971Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

  7. CHECK FOR OPEN IN CAN MAIN BUS LINE (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 FOR OPEN IN CAN MAIN BUS LINE (ECM - CAN LH J/C)  .

    Standard resistance 

    FOR OPEN IN CAN MAIN BUS LINE (ECM - CAN LH J/C)

    Tester Connection Condition Specified Value
    A5-25 (CANH) - A5-24 (CANL) Engine switch off 108 to 132 ohms
    Fig 5: Checking For Open In CAN BUS Main Wire (ECM - CAN LH J/C)
    G04051972Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE ECM 

    NG: Go to next step. 

  8. RECONNECT CONNECTOR 
    1. Reconnect the ECM connector (A5).

    Go to next step. 

  9. CHECK FOR OPEN IN CAN MAIN BUS LINE (GATEWAY ECU - CAN LH J/C) 
    1. Disconnect the gateway ECU connector (J76).
    2. Measure the resistance according to the value(s) in FOR OPEN IN CAN MAIN BUS LINE (GATEWAY ECU - CAN LH J/C)  .

    Standard resistance 

    FOR OPEN IN CAN MAIN BUS LINE (GATEWAY ECU - CAN LH J/C)

    Tester Connection Condition Specified Value
    J76-17 (CA1H) - J76-18 (CA1L) Engine switch off 108 to 132 ohms
    Fig 6: Checking For Open In CAN Main BUS Line (Gateway ECU - CAN LH J/C)
    G04051973Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE GATEWAY ECU 

    NG: Go to next step. 

  10. RECONNECT CONNECTOR 
    1. Reconnect the gateway ECU connector (J76).
  11. CHECK FOR OPEN IN CAN MAIN BUS LINE (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 FOR OPEN IN CAN MAIN BUS LINE (CAN RH J/C - GATEWAY ECU)  .

    Standard resistance 

    FOR OPEN IN CAN MAIN BUS LINE (CAN RH J/C - GATEWAY ECU)

    Tester Connection Condition Specified Value
    J84-1 (CANH) - J84-2 (CANL) Engine switch off 108 to 132 ohms
    Fig 7: Checking For Open In CAN BUS Main Wire (CAN RH J/C - Gateway ECU)
    G04051974Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE CAN MAIN BUS LINE 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).

    Go to next step. 

  13. CHECK FOR OPEN IN CAN MAIN BUS LINE (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 FOR OPEN IN CAN MAIN BUS LINE (ECM - CAN LH J/C)  .

    Standard resistance 

    FOR OPEN IN CAN MAIN BUS LINE (ECM - CAN LH J/C)

    Tester Connection Condition Specified Value
    J2-1 (CANH) - J2-2 (CANL) Engine switch off 108 to 132 ohms
    Fig 8: Checking For Open In CAN Main BUS Line (ECM - CAN LH J/C)
    G04051975Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

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