IMMOBILISER SYSTEM, Diagnostic DTC:B2799

DTC Code DTC Name
B2799 Immobiliser Malfunction

DESCRIPTION

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

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2799 Immobiliser Malfunction

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


  • A malfunction in the communication or communication lines between the ECM and ID code box (immobiliser code ECU).

  • A matching communication code cannot be verified during communication between the ECM and ID code box (immobiliser code ECU).

  • ID code box (immobiliser code ECU)

  • ECM

  • Harness or connector

DTC output confirmation operation (Either condition is met):


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

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

DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2 Pattern 3
Diagnosis Condition Engine start operation. ○ ○ ○
Malfunction Status A malfunction in the communication between the ECM and ID code box (immobiliser code ECU). ○ - -
A malfunction in the communication lines between the ECM and ID code box (immobiliser code ECU). - ○ -
A matching communication code cannot be verified during communication between the ECM and ID code box (immobiliser code ECU). - - ○
Detection Time - -
Number of Trips 1 trip 1 trip 1 trip

Tech Tips

DTC will be output when conditions for any of the patterns in the table above are met.

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 No. Data List and Active Test
B2799 -

WIRING DIAGRAM

B002DQCE09
*a ID Code Box (Immobiliser Code Box)

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • Before replacing the ECM or ID code box (immobiliser code ECU), refer to Service Bulletin.

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

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.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  2. CLEAR DTC


    1. Clear the DTCs.


      Powertrain > Engine > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK FOR DTC


    1. Perform "DTC Output Confirmation Operation" procedure.

    2. Check for DTCs.


      Powertrain > Engine > Trouble Codes
      OK
      DTC B2799 is not output.
      Result
      Result Proceed to
      DTC B2799 is not output A
      DTC B2799 is output B

    A

    END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)

    B

  4. INSPECT ECM (TERMINAL IMO)


    1. Using an oscilloscope, check the waveform.

      B002CDKC01
      *a

      Component with harness connected

      (ECM)

      		 *b Waveform
      Measurement Condition
      Item Content
      Tester Connection A12-9 (IMO) - Body ground
      Tool Setting 2 V/DIV., 500 ms./DIV.
      Condition Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected
      OK
      The waveform is similar to that shown in the illustration
      Result
      Result Proceed to
      Normal waveform A
      Terminal IMO stuck low (2.4 V or less) B
      Terminal IMO stuck high (11 to 14 V) or Abnormal waveform C

    B

    INSPECT ECM (IMO TERMINAL VOLTAGE) Click here

    C

    REPLACE ECM Click here

    A

  5. INSPECT ECM (TERMINAL IMI)


    1. Using an oscilloscope, check the waveform.

      B002E2DC01
      *a

      Component with harness connected

      (ECM)

      		 *b Waveform
      Measurement Condition
      Item Content
      Tester Connection A12-8 (IMI) - Body ground
      Tool Setting 2 V/DIV., 500 ms./DIV.
      Condition Within 3 seconds of engine start or within 3 seconds of engine switch turned on (IG) after battery cable disconnected and reconnected
      OK
      The waveform is similar to that shown in the illustration
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

    OK

  6. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK WHETHER ENGINE STARTS


    1. Check that the engine starts.

      OK
      Engine starts normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)

    NG

    REPLACE ECM Click here

  8. INSPECT ECM (IMO TERMINAL VOLTAGE)


    1. Disconnect the ECM connector.

    2. B002E1PC01
      *a

      Front view of wire harness connector

      (to ECM)

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

      Standard Voltage
      Tester Connection Condition Result
      A12-9 (IMO) - Body ground Always 2.4 V or less (stuck low)
      11 to 14 V (stuck high)
      Result
      Result Proceed to
      Terminal IMO stuck low (2.4 V or less) A
      Terminal IMO stuck high (11 to 14 V) B

    B

    REPLACE ECM Click here

    A

  9. CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - ECM)


    1. Disconnect the K60 ID code box (immobiliser code ECU) connector.

    2. Disconnect the A12 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K60-4 (EFIO) - A12-8 (IMI) Always Below 1 Ω
      K60-3 (EFII) - A12-9 (IMO) Always Below 1 Ω
      K60-4 (EFIO) or A12-8 (IMI) - Body ground Always 10 kΩ or higher
      K60-3 (EFII) or A12-9 (IMO) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR