ENGINE IMMOBILISER SYSTEM, Diagnostic DTC:B2799

DTC Code DTC Name
B2799 Engine Immobiliser System Malfunction

DESCRIPTION

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

DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B2799

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


  • A malfunction in the communication or communication lines between the power management control ECU and certification ECU (smart key ECU assembly).

  • A matching communication code cannot be verified during communication between the power management control ECU and certification ECU (smart key ECU assembly).

  • Certification ECU (smart key ECU assembly)

  • Power management control ECU

  • Wire harness or connector

Either condition is met:


  • Within 10 seconds of a hybrid control system start operation (with the shift lever in P and the brake pedal depressed, the power switch is pressed while carrying the key). If there is a malfunction, the hybrid control system does not start (communication begins within 3 seconds of the hybrid control system start operation, 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).

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 -
Related Data List and Active Test
DTC Code Data List and Active Test
B2799 -

WIRING DIAGRAM

A01I3C4E38

INSPECTION PROCEDURE

Note


  • When replacing the certification ECU (smart key ECU assembly), refer to Registration Click here.

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

Tech Tips

When DTC B2799 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. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID Click here.


    NEXT

  2. CHECK POWER MANAGEMENT CONTROL ECU (TERMINAL IMO)


    1. Using an oscilloscope, check the waveform.

      A01I62WE01
      Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)

      		 *b Waveform
      *c Approximately 160 ms *d Approximately 270 ms
      Measurement Condition
      Tester Connection Condition Tool Setting Specified Condition
      I4-28 (IMO) - Body ground Turn the power switch on (READY) 2 V/DIV., 500 ms./DIV.

      Pulse generation

      (See waveform)
      Result
      Result Proceed to
      Normal waveform A
      Terminal IMO stuck low (2.4 V or less) B
      Waveform not output, or has abnormal wavelength or shape C

    B

    CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    C

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    A

  3. CHECK POWER MANAGEMENT CONTROL ECU (TERMINAL IMI)


    1. Using an oscilloscope, check the waveform.

      A01I4PUE01
      Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)

      		 *b Waveform
      *c Approximately 160 ms *d Approximately 270 ms
      Measurement Condition
      Tester Connection Condition Tool Setting Specified Condition
      I4-29 (IMI) - Body ground Power switch on (IG) using registered electrical key transmitter sub-assembly 2 V/DIV., 500 ms./DIV.

      Pulse generation

      (See waveform)

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    OK

  4. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID Click here.


    NEXT

  5. CHECK WHETHER HYBRID CONTROL SYSTEM STARTS


    1. Using an electrical key transmitter sub-assembly which is registered to the vehicle, turn the power switch on (IG).

    2. Check that the hybrid control system starts 5 seconds after the power switch turned on (IG).

      OK
      Hybrid control system starts normally.

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

    END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)

  6. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Disconnect the I4 power management control ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I4-28 (IMO) - Body ground Power switch on (IG) using registered electrical key transmitter sub-assembly Terminal IMO stuck low (2.4 V or less)
      Terminal IMO stuck high (12 V) or abnormal waveform
      Result
      Result Proceed to
      Terminal IMO stuck low (2.4 V or less) A
      Terminal IMO stuck high (12 V) or abnormal waveform B

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Disconnect the I87 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I4-29 (IMI) - I87-14 (EFIO) Always Below 1 Ω
      I4-28 (IMO) - I87-10 (EFII) Always Below 1 Ω
      I4-29 (IMI) or I87-14 (EFIO) - Body ground Always 10 kΩ or higher
      I4-28 (IMO) or I87-10 (EFII) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


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


    NEXT

  9. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID Click here.


    NEXT

  10. CHECK WHETHER HYBRID CONTROL SYSTEM STARTS


    1. Using an electrical key transmitter sub-assembly which is registered to the vehicle, turn the power switch on (IG).

    2. Check that the hybrid control system starts 5 seconds after the power switch turned on (IG).

      OK
      Hybrid control system starts normally.

    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

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