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 output 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 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

WIRING DIAGRAM

A017E3WE07

INSPECTION PROCEDURE

Note


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

  • If the key is replaced, register the key.

PROCEDURE


  1. READ VALUE ON INTELLIGENT TESTER (IMMOBILISER SYSTEM STATUS)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to the ON position.

    3. Turn the tester on.

    4. Select Immobiliser in the Data List and read the tester display.

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

      UNSET: Ignition switch ON

      SET: Without key

      		 -
      OK
      UNSET (Ignition switch ON) appears on the screen.

    NG

    CHECK KEYS Click here

    OK

    REPLACE TRANSPONDER KEY ECU ASSEMBLY

  2. CHECK KEYS


    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 key.


    NEXT

  4. CHECK ENGINE START


    1. Check that the engine starts.

      OK
      The engine starts.

    NG

    REPLACE KEY

    OK

    END (PROBLEM WITH KEY REGISTRATION IS DEFECTIVE)

  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 IS DEFECTIVE)