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

DTC Code DTC Name
B2797 Communication Malfunction No. 1

DESCRIPTION

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

Tech Tips

Some noise is found in the communication line.

DTC No. DTC Detection Condition Trouble Area
B2797 Keys are positioned too close to each other, or noise occurs in communication line.

  • 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).

PROCEDURE


  1. CHECK KEY


    1. A01EMAFE02

      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

    B

    REPLACE TRANSPONDER KEY AMPLIFIER Click here

    A

  2. CHECK DTC OUTPUT


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

    2. Clear the DTCs Click here.

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

      OK
      No DTC is output.

    NG

    REPLACE TRANSPONDER KEY AMPLIFIER Click here

    OK

    END (KEYS WERE POSITIONED TOO CLOSE TO EACH OTHER)

  3. REPLACE TRANSPONDER KEY AMPLIFIER


    1. Replace the transponder key amplifier Click here.


    NEXT

  4. 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)