IMMOBILISER SYSTEM, Diagnostic DTC:B279A-186

DTC Code DTC Name
B279A-186 Engine Immobiliser System Communication Line High Fixation

DESCRIPTION

  • w/ ID code box (Immobiliser Code ECU)

    When the communication line (IMI - EFIO) between the hybrid vehicle control ECU and ID code box (immobiliser code ECU) is stuck high, the hybrid vehicle control ECU stores this DTC.

  • w/o ID code box (Immobiliser Code ECU)

    When the communication line (IMI - EFIO) between the hybrid vehicle control ECU and certification ECU (smart key ECU assembly) is stuck high, the hybrid vehicle control ECU stores this DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B279A-186

Engine Immobiliser System Communication Line High Fixation

The communication line (IMI - EFIO) between the hybrid vehicle control ECU and ID code box (immobiliser code ECU)*1 or certification ECU (smart key ECU assembly)*2 is stuck high (1 trip detection logic*3).

  • Harness or connector

  • ID code box (immobiliser code ECU)*1

  • Certification ECU (smart key ECU assembly)*2

  • Hybrid vehicle control ECU

DTC output confirmation operation:

  • Turn the power switch on (IG) and wait 10 seconds.

  • *1: w/ ID code box (Immobiliser Code ECU)

  • *2: w/o ID code box (Immobiliser Code ECU)

  • *3: Only output while a malfunction is present.

Table 1. 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
Table 2. Related Data List and Active Test

DTC No.

Data List and Active Test

B279A-186

-

WIRING DIAGRAM

B278904E06

CAUTION / NOTICE / HINT

Note:

  • When replacing the certification ECU (smart key ECU assembly)*1 or ID code box (immobiliser code ECU)*2, refer to the Service Bulletin.

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation."

  • *1: w/ ID code box (Immobiliser Code ECU)

  • *2: w/o ID code box (Immobiliser Code ECU)

Tip:

When DTC B279A-186 and the certification ECU (smart key ECU assembly) DTC are output simultaneously, first perform troubleshooting for the certification ECU (smart key ECU assembly) DTC.

PROCEDURE

  1. CLEAR DTC

    1. Clear the DTCs.

      Click here

      Powertrain > Hybrid Control > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  2. CHECK FOR DTC

    1. Check for DTCs.

      Click here

      Powertrain > Hybrid Control > Trouble Codes

      Tip:

      If DTCs other than DTC B279A-186 are output, troubleshoot those DTCs first.

    Result

    Proceed to

    DTC B279A-186 is not output

    DTC B279A-186 and other DTCs are output
    DTC B279A-186 and other DTCs are output

    GO TO DIAGNOSTIC TROUBLE CODE CHART

    Click here

    DTC B279A-186 is not output

  3. CHECK CONNECTION OF CONNECTOR

    1. Turn the power switch off.

    2. Check that the connectors are properly connected to the hybrid vehicle control ECU, ID code box (immobiliser code ECU)*1 and certification ECU (smart key ECU assembly)*2.

      • *1: w/ ID code box (Immobiliser Code ECU)

      • *2: w/o ID code box (Immobiliser Code ECU)

      OK

      Connectors are properly connected.

    Result

    Proceed to

    OK

    NG
    NG

    CONNECT CONNECTORS PROPERLY

    OK

  4. CHECK HARNESS AND CONNECTOR (ID CODE BOX [IMMOBILISER CODE ECU] OR CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - HYBRID VEHICLE CONTROL ECU)

    • *1: w/ ID code box (Immobiliser Code ECU)

    • *2: w/o ID code box (Immobiliser Code ECU)

    1. Disconnect the G44 ID code box (immobiliser code ECU) connector.*1

    2. Disconnect the G82 certification ECU (smart key ECU assembly) connector.*2

    3. Disconnect the G194 hybrid vehicle control ECU connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G44-4 (EFIO) - G194-22 (IMI)*1

      Always

      Below 1 Ω

      G82-13 (EFIO) - G194-22 (IMI)*2

      G194-22 (IMI) - Body ground

      Always

      10 kΩ or higher

      G44-4 (EFIO) - Body ground*1

      Always

      10 kΩ or higher

      G82-13 (EFIO) - Body ground*2

      Always

      10 kΩ or higher

      • *1: w/ ID code box (Immobiliser Code ECU)

      • *2: w/o ID code box (Immobiliser Code ECU)

    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      G194-22 (IMI) - Body ground

      Always

      Below 1 V

      G44-4 (EFIO) - Body ground*1

      Always

      Below 1 V

      G82-13 (EFIO) - Body ground*2

      Always

      Below 1 V

      • *1: w/ ID code box (Immobiliser Code ECU)

      • *2: w/o ID code box (Immobiliser Code ECU)

    Result

    Proceed to

    OK (w/ ID code box [Immobiliser Code ECU])

    OK (w/o ID code box [Immobiliser Code ECU])

    NG
    OK (w/o ID code box [Immobiliser Code ECU])

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK (w/ ID code box [Immobiliser Code ECU])

  5. REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

    1. Replace the ID code box (immobiliser code ECU) with a new one.

      Tip:

      Refer to the Service Bulletin.

    Result

    Proceed to

    NEXT
    NEXT

  6. REGISTER RECOGNITION CODES

    1. Register the recognition codes in the ECUs.

      Tip:

      Refer to the Service Bulletin.

    Result

    Proceed to

    NEXT
    NEXT

  7. REGISTER ECU COMMUNICATION ID

    1. Register the ECU communication ID.

      Tip:

      Refer to the Service Bulletin.

    Result

    Proceed to

    NEXT
    NEXT

  8. CLEAR DTC

    1. Clear the DTCs.

      Click here

      Powertrain > Hybrid Control > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  9. CHECK FOR DTC

    1. Check for DTCs.

      Click here

      Powertrain > Hybrid Control > Trouble Codes

      Tip:

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

    Result

    Proceed to

    DTC B279A-186 is not output

    DTC B279A-186 is output
    DTC B279A-186 is not output

    END (ID CODE BOX [IMMOBILISER CODE ECU] WAS DEFECTIVE)

    DTC B279A-186 is output

    REPLACE HYBRID VEHICLE CONTROL ECU

    Click here

  10. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    1. Replace the certification ECU (smart key ECU assembly) with a new one.

      Tip:

      Refer to the Service Bulletin.

    Result

    Proceed to

    NEXT
    NEXT

  11. REGISTER RECOGNITION CODES

    1. Register the recognition codes in the ECUs.

      Tip:

      Refer to the Service Bulletin.

    Result

    Proceed to

    NEXT
    NEXT

  12. REGISTER ECU COMMUNICATION ID

    1. Register the ECU communication ID.

      Tip:

      Refer to the Service Bulletin.

    Result

    Proceed to

    NEXT
    NEXT

  13. CLEAR DTC

    1. Clear the DTCs.

      Click here

      Powertrain > Hybrid Control > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  14. CHECK FOR DTC

    1. Check for DTCs.

      Click here

      Powertrain > Hybrid Control > Trouble Codes

      Tip:

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

    Result

    Proceed to

    DTC B279A-186 is not output

    DTC B279A-186 is output
    DTC B279A-186 is not output

    END (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] WAS DEFECTIVE)

    DTC B279A-186 is output

    REPLACE HYBRID VEHICLE CONTROL ECU

    Click here