ENGINE IMMOBILISER SYSTEM, Diagnostic DTC:B2797

DTC Code DTC Name
B2797 Communication Malfunction No. 1

DESCRIPTION

This DTC is output when a communication error occurs between the transponder key coil and transponder key ECU.

Tech Tips

Noise is found in the communication line.

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

-Key

-Wire harness or connector

-Transponder key coil

-Transponder key ECU assembly

WIRING DIAGRAM

A0138BUE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK KEYS


    1. A0137FN

      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 near other keys and/or key rings in contact with key grip A
      Key not near other keys and key rings not in contact with key grip B

    B

    CHECK WHETHER ENGINE STARTS WITH OTHER KEYS Click here

    A

  2. CHECK FOR DTCs


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

    2. Clear the DTC Click here.

    3. Insert a key into the ignition key cylinder. Then turn the key to the ACC position and remove it. Perform this for all the other keys.

    4. Check that no DTC is output.

      OK
      No DTC output

    OK

    END

    NG

  3. CHECK WHETHER ENGINE STARTS WITH OTHER KEYS


    1. Insert the another of the vehicle's keys into the ignition key cylinder.

    2. Check that the engine starts with the key.

      Note

      Prior to inspection, make sure that there are no strong radio wave sources, which may cause communication failures, between the key and coil.

      OK
      Engine starts.

    OK

    RE-REGISTER OR REPLACE KEY THAT WILL NOT START ENGINE

    NG

  4. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - TRANSPONDER KEY COIL)


    1. A0137FEE01

      Disconnect the C30 transponder key ECU assembly connector.

    2. Disconnect the C31 transponder key coil connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard Resistance
      Tester Connection Specified Condition
      C30-4 (AN1) - C31-1 (AN1) Below 1 Ω
      C30-5 (AN2) - C31-2 (AN2) Below 1 Ω
      C30-4 (AN1) -or C31-1 (AN1) - Body ground 10 kΩ or higher
      C30-5 (AN2) -or C31-2 (AN2) - Body ground 10 kΩ or higher

    4. Reconnect the transponder key coil connector.

    5. Reconnect the transponder key ECU assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE TRANSPONDER KEY COIL


    NEXT

  6. CHECK OPERATION OF TRANSPONDER KEY COIL


    1. After replacing the transponder key coil, check that the engine starts.

      OK
      Engine starts.

      Tech Tips

      Re-register all the keys after replacing the transponder key ECU assembly


    NG

    REPLACE TRANSPONDER KEY ECU ASSEMBLY

    OK

    END