ENGINE IMMOBILISER SYSTEM (w/o Entry and Start System), Diagnostic DTC:B2797, B2798

DTC Code DTC Name
B2797 Communication Malfunction No. 1
B2798 Communication Malfunction No. 2

DESCRIPTION

This DTC is stored when an error occurs in communication between the transponder key amplifier and the transponder key ECU.

Tech Tips

Some noise is found in the communication line.

DTC No. DTC Detection Condition Trouble Area

B2797

B2798

 A communication error occurs for about 20 seconds after insertion of a key.

  • Key

  • Transponder key amplifier

  • Transponder key ECU

WIRING DIAGRAM

A011929E13

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK KEYS


    1. A011BHBE02

      Check whether the ignition key being used is near other ignition keys, as shown in the illustration. Also, check whether the key ring is in contact with the key grip.

      Result
      Result Proceed to
      Key is near other keys and/or key ring is in contact with key grip. A
      Key is not near other keys and key ring is not in contact with key grip. B

      Tech Tips

      If 2 or more ignition keys are positioned close together or if something that interferes with radio waves, such as a metal object, is on the key ring, then communication noise may occur.


    B

    CHECK WHETHER ENGINE STARTS WITH OTHER KEYS Click here

    A

  2. REMOVE NOISE SOURCE


    1. Separate the keys from each other, or remove the key ring.


    NEXT

  3. CLEAR DTC


    1. Clear the DTC Click here.


    NEXT

  4. CHECK FOR DTC


    1. Insert a key into the ignition key cylinder and remove the key.

    2. Check for DTC Click here.

      OK
      DTC is not output.

    NG

    CHECK WHETHER ENGINE STARTS WITH OTHER KEYS Click here

    OK

    END

  5. CHECK WHETHER ENGINE STARTS WITH OTHER KEYS


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

      OK
      Engine starts.

    NG

    REPLACE TRANSPONDER KEY AMPLIFIER Click here

    OK

    REPLACE KEY THAT CANNOT START ENGINE

  6. REPLACE TRANSPONDER KEY AMPLIFIER


    1. Replace the transponder key amplifier Click here.


    NEXT

  7. CLEAR DTC


    1. Clear the DTC Click here.


    NEXT

  8. CHECK FOR DTC


    1. Insert a key into the ignition key cylinder and remove the key. Repeat for all the other keys of the vehicle.

    2. Check for DTCs Click here.

      OK
      DTC is not output.

    NG

    REPLACE TRANSPONDER KEY ECU

    OK

    END (TRANSPONDER KEY AMPLIFIER IS DEFECTIVE)