LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2008 >> IS 250 RWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 24 (Theft Deterrent / Keyless Entry) >> Engine Immobilizer System >> DTC B279A: Theft Deterrent System Communication Line High Fixation >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • If the ID code box (immobilizer code ECU) is replaced, register the ECU code and ECU communication ID (See REGISTRATION  ).
  • If the ECM is replaced, register the ECU communication ID (See REGISTRATION  ).
  1. CHECK DTC OUTPUT 
    1. Clear the DTCs (See DTC CHECK / CLEAR  )
    2. Recheck for DTCs.

      HINT

      If any DTCs other than DTC B279A are output, troubleshoot those DTCs first

      Result 

      RESULT REFERENCE

      Result Proceed to
      DTC B279A and other DTCs are output A
      DTC B279A is output B

    A: GO TO DIAGNOSTIC TROUBLE CODE CHART 

    B: Go to next Step 

  2. CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILIZER CODE ECU) - ECM) 
    1. Disconnect the ID code box (immobilizer code ECU) connector
    2. Disconnect the ECM connector
      Fig 1: Identifying J69 And A6 Connector Terminal
      G05754515Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance and voltage according to the value (s) in the table below

      Standard Resistance 

      RESISTANCE REFERENCE

      Tester Connection Condition Specified Condition
      J69-6 (EFIO) - A6-31 (IMI) Always Below 1 Ω
      J69-6 (EFIO) - Body ground Always 10 kΩ or higher

      Standard Voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      J69-6 (EFIO) - Body ground Always Below 1 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next Step 

  3. CHECK ECM (INPUT) 
    1. Reconnect the ID code box (immobilizer code ECU) connector
    2. Reconnect the ECM connector
    3. Measure the waveform
      Fig 2: Harness Connector Normal Waveform Diagram
      G05754516Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Waveform (Reference) 

      WAVEFORM REFERENCE

      Item Content
      Terminal No. (Symbols) A6-31 (IMI) - E6-1 (E1)
      Tool Setting 10V/DIV., 100 msec/DIV
      Condition Engine switch on (IG)

      OK: Waveform is output normally (see illustration above). 

    NG: Go to step 4 

    OK: REPLACE ECM  (See REMOVAL )

  4. REPLACE ID CODE BOX (IMMOBILIZER CODE ECU) 
    1. Replace the ID code box (immobilizer code ECU) (See REMOVAL  ).
  5. REGISTER ECU CODE 
    1. Register the ECU code (See REGISTRATION  )
  6. REGISTER ECU COMMUNICATION ID 
    1. Register the ECU communication ID (See REGISTRATION  ).
  7. CHECK DTC OUTPUT 
    1. Clear the DTCs (See DTC CHECK / CLEAR  )
    2. Recheck for DTCs

      OK: B279A output does not recur. 

    NG: REPLACE ECM  (See REMOVAL )

    OK: END (ID CODE BOX (IMMOBILIZER CODE ECU) IS DEFECTIVE) 

scientia non olet · About LEMON Manuals