IMMOBILISER SYSTEM, Diagnostic DTC:B2799-790

DTC Code DTC Name
B2799-790 Engine Immobiliser System Malfunction

DESCRIPTION

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

    When there is a communication malfunction between the hybrid vehicle control ECU and ID code box (immobiliser code ECU), or when the communication ID codes do not match, the hybrid vehicle control ECU stores this DTC.

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

    When there are communication malfunctions between the hybrid vehicle control ECU and certification ECU (smart key ECU assembly), or when the communication ID codes do not match, the hybrid vehicle control ECU stores this DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B2799-790

Engine Immobiliser System Malfunction

Either condition is met (1 trip detection logic*3):

  • A malfunction in the communication or communication lines between the hybrid vehicle control ECU and ID code box (immobiliser code ECU)*1 or certification ECU (smart key ECU assembly)*2.

  • A matching communication code cannot be verified during communication between the hybrid vehicle control ECU and ID code box (immobiliser code ECU)*1 or certification ECU (smart key ECU assembly)*2.

  • ID code box (immobiliser code ECU)*1

  • Certification ECU (smart key ECU assembly)*2

  • Hybrid vehicle control ECU

  • Harness or connector

DTC output confirmation operation (Either condition is met):

  • Within 10 seconds of a hybrid control system start operation being performed (with the shift lever in P and the brake pedal depressed, the power switch is pressed while the key is being carried). If there is a malfunction, the hybrid control system stops (communication begins within 3 seconds of the hybrid control system start operation being performed, and DTCs are stored after 6 seconds).

  • 10 seconds after the power switch is turned on (IG) after reconnecting the cable to the negative (-) auxiliary battery terminal (communication begins within 3 seconds of the power switch being turned on (IG), and DTCs are stored after 6 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

-
Table 2. Related Data List and Active Test

DTC No.

Data List and Active Test

B2799-790

-

WIRING DIAGRAM

  1. B278902E07

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 B2799-790 and a certification ECU (smart key ECU assembly) DTC are output simultaneously, first perform troubleshooting for the certification ECU (smart key ECU assembly) DTC.

PROCEDURE

  1. SYSTEM CHECK

    1. Check the vehicle specification.

    Result

    Proceed to

    NEXT
    NEXT

  2. 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

      G44-3 (EFII) - G194-23 (IMO)*1

      Always

      Below 1 Ω

      G82-14 (EFII) - G194-23 (IMO)*2

      G194-23 (IMO) - Body ground

      Always

      10 kΩ or higher

      G44-3 (EFII) - Body ground*1

      Always

      10 kΩ or higher

      G82-14 (EFII) - Body ground*2

      Always

      10 kΩ or higher

      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)

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REGISTER ECU COMMUNICATION ID

    1. Reregister the ECU communication ID.

      Tip:

      Refer to the Service Bulletin.

    Result

    Proceed to

    NEXT
    NEXT

  4. CLEAR DTC

    1. Clear the DTCs.

      Click here

      Powertrain > Hybrid Control > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  5. 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

    B2799-790 is not output

    B2799-790 is output

    Other DTCs are output
    B2799-790 is not output

    END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)

    Other DTCs are output

    GO TO DIAGNOSTIC TROUBLE CODE CHART

    Click here

    B2799-790 is output

  6. REPLACE HYBRID VEHICLE CONTROL ECU

    1. Temporarily replace the hybrid vehicle control ECU with a new one.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  7. REGISTER ECU COMMUNICATION ID

    1. Reregister 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.

      OK

      DTC B2799-790 is not output.

    Result

    Proceed to

    OK

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

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

    END (HYBRID VEHICLE CONTROL ECU WAS DEFECTIVE)

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

    REPLACE IMMOBILIZER CODE ECU

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

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)