ENGINE IMMOBILISER SYSTEM (w/o Entry and Start System), Diagnostic DTC:B2796

DTC Code DTC Name
B2796 No Communication in Immobiliser System

DESCRIPTION

These DTCs are stored if a key that does not have a transponder chip is inserted into the ignition key cylinder or if communication between the key and transponder key ECU is impossible.

DTC No. DTC Detection Condition Trouble Area
B2796

  • A key without an ID code (without a communication IC chip) is inserted in to the ignition key cylinder.

  • Communication is not established within about 20 seconds after the key is inserted.

  • Key

  • Transponder key amplifier

  • Transponder key ECU

  • Wire harness or connector

WIRING DIAGRAM

A011833E17

INSPECTION PROCEDURE

Note


  • If the transponder key ECU is replaced, register the key and ECU - ECM communication ID.

  • If the key is replaced, register the key.

PROCEDURE


  1. CHECK WHETHER ENGINE STARTS WITH OTHER KEYS


    1. Check if the engine starts with an already registered vehicle key.

      OK
      Engine starts.

    NG

    CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER) Click here

    OK

    RE-REGISTER OR REPLACE KEY THAT CANNOT START ENGINE

  2. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)


    1. Disconnect the D29 transponder key ECU connector.

    2. A0117FNE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Transponder Key ECU)
      *2

      Front view of wire harness connector

      (to Transponder Key Amplifier)

      Disconnect the D31 transponder key amplifier connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      D29-4 (TXCT) - D31-5 (TXCT) Always Below 1 Ω
      D29-5 (AGND) - D31-7 (AGND) Always Below 1 Ω
      D29-14 (VC5) - D31-1 (VC5) Always Below 1 Ω
      D29-15 (CODE) - D31-4 (CODE) Always Below 1 Ω
      D29-4 (TXCT) - Body ground Always 10 kΩ or higher
      D29-5 (AGND) - Body ground Always 10 kΩ or higher
      D29-14 (VC5) - Body ground Always 10 kΩ or higher
      D29-15 (CODE) - Body ground Always 10 kΩ or higher

    4. Reconnect the amplifier and ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE TRANSPONDER KEY AMPLIFIER


    1. Replace the transponder key amplifier Click here.


    NEXT

  4. CLEAR DTC


    1. Clear the DTC Click here.


    NEXT

  5. CHECK FOR DTC


    1. Check for DTC Click here.

      OK
      DTC is not output.

    NG

    REPLACE TRANSPONDER KEY ECU

    OK

    END (TRANSPONDER KEY AMPLIFIER IS DEFECTIVE)