ENGINE IMMOBILISER SYSTEM(w/o Power Switch), Diagnostic DTC:B279A

DTC Code DTC Name
B279A Theft Deterrent System Communication Line High Fixation

DESCRIPTION

When the communication line (IMI - EFIO) between the power management control ECU and transponder key ECU assembly is stuck on HI output, the power management control ECU stores this DTC.

DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B279A The communication line (IMI - EFIO) between the power management control ECU and transponder key ECU assembly is stuck on HI output (1 trip detection logic*).

  • Harness or connector

  • Transponder key ECU assembly

  • Power management control ECU

 Turn the ignition switch to ON and wait 6 seconds.

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
Hybrid control system cannot be started Hybrid control system cannot be started
Related Data List and Active Test
DTC Code Data List and Active Test
B279A -

WIRING DIAGRAM

A01V0QOE14
*1 Power Management Control ECU
*2 Transponder Key ECU Assembly

CAUTION / NOTICE / HINT

Note


  • When replacing the transponder key ECU assembly, refer to Service Bulletin.

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

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      Tech Tips

      Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

      OK
      DTC B279A is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. CHECK CONNECTION OF CONNECTOR


    1. Check that the connectors are properly connected to the power management control ECU and transponder key ECU assembly.

      OK
      Connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  4. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - POWER MANAGEMENT CONTROL ECU AND BODY GROUND)


    1. Disconnect the F40 transponder key ECU assembly connector.

    2. Disconnect the F56 power management control ECU connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      F40-13 (EFIO) - F56-21 (IMI) Always Below 1 Ω
      F40-13 (EFIO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE TRANSPONDER KEY ECU ASSEMBLY


    1. Replace the transponder key ECU assembly with a new one (refer to Service Bulletin).


    NEXT

  6. REGISTER KEY


    1. Register the key (refer to Service Bulletin).


    NEXT

  7. REGISTER ECU COMMUNICATION ID


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


    NEXT

  8. CHECK WHETHER HYBRID CONTROL SYSTEM STARTS


    1. Check that the hybrid control system starts with the key.

      OK
      Hybrid control system starts normally.

    OK

    END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here