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Home >> Lexus >> 2012 >> IS 250 Base, AWD >> Repair and Diagnosis >> Electrical >> Starter >> Smart Access System (Keyless Start) (Diagnostic Codes & Symptom Tests) >> Smart Access System With Push-Button Start >> DTC B2273: Ignition 2 Monitor Malfunction >> Procedure

DTC B2273: Ignition 2 Monitor Malfunction: Procedure

  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.
      Fig 1: Identifying J55 Power Source Control ECU Connector
      GTY118688Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      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.

      Standard resistance

      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.
      Fig 2: Inspecting Relay (IG2)
      GTY103051Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance of the relay.

      Standard resistance

      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)

    NG → See 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: Inspecting Resistance & Voltage (Power Source Control ECU Or Battery - IG2 Relay)
      GTY139320Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance

      Tester Connection (Symbols) Condition Specified Condition
      Engine room R/B No. 2 IG2 relay terminal 2 - J55-35 (IG2D) Always Below 1 Ω
      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.
      Fig 4: Identifying J55 Power Source Control ECU Connector
      GTY126831Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection (Symbols) Condition Specified Condition
      J55-35 (IG2D) - Body ground Engine switch on (IG) Below 1 V

    NG → See step   9 

    OK: Go to next step 

  6. INSPECT POWER SOURCE CONTROL ECU 
    1. Reconnect the J55 ECU connector.
      Fig 5: Identifying Terminal IG2D Of J55 Power Source Control ECU Connector
      GTY119531Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      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

    NG → REPLACE POWER SOURCE CONTROL ECU 

    OK: Go to next step 

  7. RECHECK FOR DTC 
    1. Delete the DTCs. Refer to DTC CHECK / CLEAR .
    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.
      Fig 6: Identifying Terminal IG2D Of J55 Power Source Control ECU Connector
      GTY119531Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      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

    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.
      Fig 7: Identifying Terminal IG2D Of J55 Power Source Control ECU Connector
      GTY119531Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      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

    NG → REPLACE POWER SOURCE CONTROL ECU 

    OK → END 

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