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Home >> Toyota >> 2008 >> FJ Cruiser RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 242 (Engine Immobilizer) >> Engine Immobilizer System >> DTC B2796 No Communication in Immobiliser System; DTC B2798 Communication Malfunction No. 2 >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ VALUE USING TECHSTREAM 
    1. Connect a Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the tester on.
    4. Enter the following menus: Body Electrical/ Immobilizer/ Data List.
    5. According to the display on tester, read the "Data List".

      Immobilizer: 

      DATA LIST

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Immobilizer Immobilizer system status/SET or UNSET UNSET: Ignition switch ON
      SET: Without key      		 -

      OK: "UNSET" (ignition switch ON) appears on the screen. 

    NG: Go to step 2 

    OK: REPLACE TRANSPONDER KEY ECU ASSEMBLY 

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

      OK: Engine starts. 

    NG: Go to step 3 

    OK: RE-REGISTER OR REPLACE KEY THAT CANNOT START ENGINE 

  3. READ VALUE USING TECHSTREAM 
    1. Connect a Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the tester on.
    4. Enter the following menus: Body Electrical / Immobilizer / Data List.
    5. According to the display on tester, read the "Data List".

      Immobilizer: 

      DATA LIST

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Antenna Coil Status Antenna coil condition/NORMAL or FAIL NORMAL: Antenna coil is normal
      FAIL: Antenna coil is malfunctioning      		 -

      OK: "NORMAL" (antenna coil is normal) appears on the screen. 

    NG: REPLACE TRANSPONDER KEY AMPLIFIER 

    OK: Go to next step. 

  4. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER) 
    1. Disconnect the D23 transponder key ECU connector.
      2. Fig 1: Identifying Transponder Key ECU And Transponder Key Amplifier Connector Terminals
      G04830947Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the D24 transponder key amplifier connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      D23-14 (VC5) - D24-1 (VC5) Below 1 Ω
      D23-15 (CODE) - D24-4 (CODE) Below 1 Ω
      D23-4 (TXCT) - D24-5 (TXCT) Below 1 Ω
      D23-5 (AGND) - D24-7 (AGND) Below 1 Ω
      D23-14 (VC5) or D24-1 (VC5) - Body ground 10 kΩ or higher
      D23-15 (CODE) or D24-4 (CODE) - Body ground 10 kΩ or higher
      D23-4 (TXCT) or D24-5 (TXCT) - Body ground 10 kΩ or higher
      D23-5 (AGND) or D24-7 (AGND) - Body ground 10 kΩ or higher
    4. Reconnect the D23 transponder key ECU connector.
    5. Reconnect the D24 transponder key amplifier connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step. 

  5. REPLACE TRANSPONDER KEY AMPLIFIER 
    1. After replacing the transponder key amplifier with a normally functioning amplifier, check that the engine starts.

      OK: Engine starts. 

    NG: REPLACE TRANSPONDER KEY ECU ASSEMBLY 

    OK: END (TRANSPONDER KEY AMPLIFIER DEFECTIVE) 

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