ENGINE IMMOBILISER SYSTEM(w/ Entry and Start System), Diagnostic DTC:B1571

DTC Code DTC Name
B1571 Immobiliser Key Check NG

DESCRIPTION

The ECM stores this code if the certification ECU (smart key ECU assembly) reference code and the reference code from the ECM do not match.

DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B1571 The ECM reference code and reference code from the certification ECU (smart key ECU assembly) do not match (1 trip detection logic*).

  • ECM

  • Certification ECU (smart key ECU assembly)

 Engine switch on (IG)

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
Engine cannot be started -
Related Data List and Active Test
DTC Code Data List and Active Test
B1571 -

CAUTION / NOTICE / HINT

Note


  • Before replacing the certification ECU (smart key ECU assembly), refer to the entry and start system (for Entry Function) Click here.

  • After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

PROCEDURE


  1. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID (Refer to Service Bulletin).

    2. Check that the engine can be started.

      OK
      The engine can be started.

    OK

    END

    NG

  2. REPLACE ECM


    1. Temporarily replace the ECM with a new one Click here.


    NEXT

  3. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID (Refer to Service Bulletin).

    2. Check that the engine can be started.

      OK
      The engine can be started.

    OK

    END (ECM WAS DEFECTIVE)

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)