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Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT FUSE (AM2) 
    1. Remove the AM2 fuse from the cowl side J/B RH.
    2. Measure the resistance of the fuse.

      Standard resistance: 

      Below 1 Ω 

    NG: REPLACE FUSE 

    OK: Go to Next Step 

  2. CHECK CONNECTORS 
    1. Check that the connectors are securely connected and the terminals are not deformed or loose.

      OK: 

      The connectors are securely connected and the terminals are not deformed or loose. 

    NG: REPAIR OR REPLACE CONNECTORS 

    OK: Go to Next Step 

  3. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND) 
    1. Disconnect the J55 ECU connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-33 (AM1) - Body ground Always 10 to 14 V
      J55-12 (AM2) - Body ground Always 10 to 14 V
    3. Measure the resistance according to the value (s) in the table below.
      Fig 1: Identifying J55 Power Source Control ECU Connector
      G05829079Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-6 (GND2) - Body ground Always Below 1 Ω

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  4. INSPECT RELAY (IG2) 
    1. Remove the IG2 relay from the engine room R/B No. 2.
    2. Measure the resistance of the relay.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω (when battery voltage is applied to terminals 1 and 2)
      3. Fig 2: Inspecting Relay (IG2)
      G05829080Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  8

    OK: Go to Next Step 

  5. CHECK WIRE HARNESS (ENGINE ROOM R/B NO. 2 - POWER SOURCE CONTROL ECU) 
    1. Measure the resistance according to the value (s) in the table below.
      Fig 3: Identifying Engine Room R/B No. 2 And Power Source Control ECU Connector
      G05829081Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      Engine room R/B No. 2 IG2 relay terminal 2 - J55-35 (IG2D) Always Below 112
      Engine room R/B No. 2 IG2 relay terminal 1 - Body ground Always Below 1 Ω
      Engine room R/B No. 2 IG2 relay terminal 2 or J55-35 (IG2D) - Body ground Always 10 kΩ or higher
    2. Install the IG2 relay.
    3. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-35 (IG2D) - Body ground Engine switch on (IG) Below 1 V
      4. Fig 4: Identifying Terminal IG2D Of J55 Power Source Control ECU Connector
      G05829082Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  9

    OK: Go to Next Step 

  6. INSPECT POWER SOURCE CONTROL ECU 
    1. Reconnect the J55 ECU connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-35 (IG2D) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 8 to 14 V
      3. Fig 5: Identifying Terminal IG2D Of J55 Power Source Control ECU Connector
      G05829083Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER SOURCE CONTROL ECU 

    OK: Go to Next Step 

  7. RECHECK FOR DTC 
    1. Delete the DTCs (See DIAGNOSIS SYSTEM  ).
    2. Check for DTCs again.

      OK: 

      DTC B2273 is not output. 

    NG: REPLACE POWER SOURCE CONTROL ECU 

    OK: CHECK INTERMITTENT PROBLEMS 

  8. REPLACE FAULTY RELAY OR J/B AND CHECK POWER SOURCE CONTROL ECU 
    1. Replace a faulty relay or J/B and then connect the power source control ECU connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-35 (IG2D) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 8 to 14 V
      3. Fig 6: Identifying Terminal IG2D Of J55 Power Source Control ECU Connector
      G05829083Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER SOURCE CONTROL ECU 

    OK: END 

  9. REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR AND CHECK POWER SOURCE CONTROL ECU 
    1. Repair or replace a faulty wire harness or connector and then connect the power source control ECU connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection (Symbols) Condition Specified Condition
      J55-3S (IG2D) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 8 to 14 V
      3. Fig 7: Identifying Terminal IG2D Of J55 Power Source Control ECU Connector
      G05829083Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE POWER SOURCE CONTROL ECU 

    OK: END 

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