ENGINE IMMOBILISER SYSTEM (w/o Smart Entry and Start System), Diagnostic DTC:B2796, B2798

DTC Code DTC Name
B2796 No Communication in Immobiliser System
B2798 Communication Malfunction No. 2

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 the transponder key ECU assembly is impossible.

DTC No. DTC Detection Condition Trouble Area
B2796 The key code cannot be transmitted.

  • Key

  • Transponder key amplifier

  • Transponder key ECU assembly
B2798 Key code identification cannot be completed within the specified time (0.15 to 0.5 sec.).

  • Key

  • Transponder key amplifier

  • Transponder key ECU assembly

INSPECTION PROCEDURE

Note


  • If the transponder key ECU assembly is replaced, register the key and ECU communication ID (Refer to Service Bulletin).

  • If the key is replaced, register the key (Refer to Service Bulletin).

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Immobiliser / Data List.

    5. Read the Data List according to the display on the GTS.

      Immobiliser (Transponder Key ECU Assembly)
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Immobiliser Immobiliser system status/SET or UNSET

      UNSET: Ignition switch ON

      SET: Without key

      		 -
      OK
      On the GTS screen, the item changes between UNSET and SET according to the chart above.

    NG

    CHECK KEY Click here

    OK

    REPLACE TRANSPONDER KEY ECU ASSEMBLY

  2. CHECK KEY


    1. Insert the vehicle's other key into the ignition key cylinder.

    2. Check that the engine starts with this key.

      OK
      The engine starts.

    NG

    REPLACE TRANSPONDER KEY AMPLIFIER Click here

    OK

  3. RE-REGISTER KEY


    1. Re-register the original key.

      Tech Tips

      Refer to Service Bulletin.


    NEXT

  4. CHECK ENGINE START


    1. Check that the engine starts.

      OK
      The engine starts.

    NG

    REPLACE KEY

    OK

    END (KEY WAS NOT REGISTERED CORRECTLY)

  5. REPLACE TRANSPONDER KEY AMPLIFIER


    1. Replace the transponder key amplifier Click here.


    NEXT

  6. CHECK ENGINE START


    1. Check that the engine starts.

      OK
      The engine starts.

    NG

    REPLACE TRANSPONDER KEY ECU ASSEMBLY

    OK

    END (TRANSPONDER KEY AMPLIFIER WAS DEFECTIVE)