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Home >> Toyota >> 2008 >> FJ Cruiser RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 183 (Engine Immobilizer) >> Engine Immobilizer System >> DTC B2796 No Communication in Immobilizer System; DTC B2798 Communication Malfunction No. 2 >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ VALUE OF TECHSTREAM (ENGINE IMMOBILIZER SYSTEM) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch ON with a key that cannot start the engine.
    3. On the Techstream, enter the following menus: Body Electrical / immobilizer / Data List / immobilizer. Read the result.

      Transponder key ECU: 

      TRANSPONDER KEY ECU

      Item Measurement Item / Display (Range) Normal Condition Diagnostic Note
      IMMOBILIZER Immobilizer system status / SET or UNSET SET: No key is in ignition key cylinder
      UNSET: Key is in ignition key cylinder      		 -

      OK: UNSET (key is in ignition key cylinder) appears on the screen. 

    OK: REPLACE TRANSPONDER KEY ECU 

    NG: GO TO NEXT STEP. 

  2. CHECK WHETHER ENGINE STARTS WITH OTHER KEY 
    1. Check whether the engine starts with the vehicle's other keys.

      OK: Engine starts. 

    NG: REREGISTER OR REPLACE KEY THAT CANNOT START ENGINE 

    OK: GO TO NEXT STEP. 

  3. READ VALUE OF TECHSTREAM (TRANSPONDER KEY COIL) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch ON with a key that cannot start the engine.
    3. On the Techstream, enter the following menus: Body Electrical / immobilizer / Data List / Antenna Coil Status. Read the result.

      Transponder key ECU: 

      TRANSPONDER KEY ECU

      Item Measurement Item / Display (Range) Normal Condition Diagnostic Note
      ANTENNA COIL Transponder key coil condition/NORMAL or FAIL NORMAL: Transponder key coil is normal
      FAIL: Transponder key coil is malfunctioning      		 -

      OK: NORMAL (Transponder key coil is normal) appears on the screen. 

    OK: REPLACE TRANSPONDER KEY ECU 

    NG: GO TO NEXT STEP. 

  4. CHECK WIRE HARNESS (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER) 
    1. Disconnect the E46 ECU connector.
    2. Disconnect the E5 amplifier connector.
    3. Measure the resistance of the wire harness side connectors.
      Fig 1: Identifying E46 ECU & E5 Amplifier Connector Terminals
      G04490663Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      WIRE HARNESS (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)

      Tester Connection Specified Condition
      E46-14 (VC5) - E5-1 (VC5) Below 1 Ω
      E46-15 (CODE) - E5-4 (CODE)
      E46-4 (TXCT) - E5-5 (TXCT)
      E46-5 (AGND) - E5-7 (AGND)
      E46-14 (VC5) or E5-1 (VC5) - Body ground 10 kΩ or higher
      E46-15 (CODE) or E5-4 (CODE) - Body ground
      E46-4 (TXCT) or E5-5 (TXCT) - Body ground
      E46-5 (AGND) or E5-7 (AGND) - Body ground

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: GO TO NEXT STEP. 

  5. CHECK TRANSPONDER KEY AMPLIFIER (OPERATION) 
    1. Temporarily replace the transponder key amplifier with a new or normally functioning one.
    2. Check that the engine starts normally.

      OK: Engine starts normally. 

    NG: REPLACE TRANSPONDER KEY ECU 

    OK: END (TRANSPONDER KEY AMPLIFIER IS DEFECTIVE) 

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