ENGINE IMMOBILISER SYSTEM(w/ Entry and Start System), Diagnostic DTC:B2799

DTC Code DTC Name
B2799 Engine Immobiliser System 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 Engine Immobiliser System Malfunction

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


  • 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 an engine start operation being performed (with the shift lever in P*2 and the brake pedal*2 or clutch pedal*3 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).

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

B001CG6E05

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 ID code box (immobiliser code ECU) or ECM, refer to Service Bulletin.

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

Tech Tips

When DTC B2799 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. REGISTER ECU COMMUNICATION ID


    1. Reregister the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin

      Result
      Proceed to
      NEXT

    NEXT

  2. CLEAR DTC


    1. Clear the DTCs.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK FOR DTC


    1. Start the engine.

    2. Check for DTCs.

      Click here

      Tech Tips

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

      OK
      B2799 is not output.
      Result
      Result Proceed to
      OK A
      NG (DTC B2799 is output) B
      NG (Other DTCs are output) C

    A

    END (REGISTERED COMMUNICATION ID WAS DEFECTIVE)

    C

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    B

  4. INSPECT ECM (TERMINAL IMO)


    1. Using an oscilloscope, check the waveform.

      B001H3MC01
      *A for 1GR-FE *B for 2TR-FE
      *C for 1KD-FTV *D for 1GD-FTV
      *E for Automatic Transmission *F for Manual Transmission
      *a

      Component with harness connected

      (ECM)

      		 *b Waveform
      Measurement Condition
      Item Content
      Tester Connection

      G56-8 (IMO) - Body ground*1

      G56-20 (IMO) - Body ground*2

      G181-9 (IMO) - Body ground*3

      G58-29 (IMO) - Body ground*4

      G185-17 (IMO) - Body ground*5
      Tool Setting 2 V/DIV., 500 ms./DIV.
      Condition Within 3 seconds after engine starts, or within 3 seconds after engine switch turned on (IG) after battery disconnected and reconnected

      • *1: for 1GR-FE (for Automatic Transmission)

      • *2: for 1GR-FE (for Manual Transmission)

      • *3: for 2TR-FE

      • *4: for 1KD-FTV

      • *5: for 1GD-FTV

      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 (12 V) or abnormal waveform C

    B

    INSPECT ECM (IMO TERMINAL VOLTAGE) Click here

    C

    GO TO STEP 8 Click here

    A

  5. INSPECT ECM (TERMINAL IMI)


    1. Using an oscilloscope, check the waveform.

      B001D5LC01
      *A for 1GR-FE *B for 2TR-FE
      *C for 1KD-FTV *D for 1GD-FTV
      *E for Automatic Transmission *F for Manual Transmission
      *a

      Component with harness connected

      (ECM)

      		 *b Waveform
      Measurement Condition
      Item Content
      Tester Connection

      G56-10 (IMI) - Body ground*1

      G56-14 (IMI) - Body ground*2

      G181-10 (IMI) - Body ground*3

      G58-28 (IMI) - Body ground*4

      G185-16 (IMI) - Body ground*5
      Tool Setting 2 V/DIV., 500 ms./DIV.
      Condition Within 3 seconds after engine starts, or within 3 seconds after engine switch turned on (IG) after battery disconnected and reconnected

      • *1: for 1GR-FE (for Automatic Transmission)

      • *2: for 1GR-FE (for Manual Transmission)

      • *3: for 2TR-FE

      • *4: for 1KD-FTV

      • *5: for 1GD-FTV

      OK
      The waveform is similar to that shown in the illustration.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 8 Click here

    OK

  6. REGISTER ECU COMMUNICATION ID


    1. Reregister the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK WHETHER ENGINE STARTS


    1. Using a registered vehicle key, turn the engine switch on (IG).

    2. Check that the engine starts 5 seconds after the engine switch turned on (IG).

      OK
      Engine starts normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)

    NG

  8. REPLACE ECM


    1. Temporarily replace the ECM with a new one.


      Result
      Proceed to
      NEXT

    NEXT

  9. REGISTER ECU COMMUNICATION ID


    1. Reregister the ECU communication ID.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  10. CHECK WHETHER ENGINE STARTS


    1. Using a registered vehicle key, turn the engine switch on (IG).

    2. Check that the engine starts 5 seconds after the engine switch turned on (IG).

      OK
      Engine starts normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (ECM WAS DEFECTIVE)

    NG

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

  11. INSPECT ECM (IMO TERMINAL VOLTAGE)


    1. Disconnect the ECM connector.

    2. Turn the engine switch on (IG).

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

      B001C8JC01
      *A for 1GR-FE *B for 2TR-FE
      *C for 1KD-FTV *D for 1GD-FTV
      *E for Automatic Transmission *F for Manual Transmission
      *a

      Front view of wire harness connector

      (to ECM)

      		 - -
      Standard Voltage
      Tester Connection Condition Result

      G56-8 (IMO) - Body ground*1

      G56-20 (IMO) - Body ground*2

      G181-9 (IMO) - Body ground*3

      G58-29 (IMO) - Body ground*4

      G185-17 (IMO) - Body ground*5

      		 Engine switch on (IG) using registered key Terminal IMO stuck low (2.4 V or less)
      Terminal IMO stuck high (12 V) or abnormal waveform

      • *1: for 1GR-FE (for Automatic Transmission)

      • *2: for 1GR-FE (for Manual Transmission)

      • *3: for 2TR-FE

      • *4: for 1KD-FTV

      • *5: for 1GD-FTV

      Result
      Result Proceed to
      Terminal IMO stuck low (2.4 V or less) A
      Terminal IMO stuck high (12 V) or abnormal waveform B

    B

    GO TO STEP 8 Click here

    A

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


    1. Disconnect the G207 ID code box (immobiliser code ECU) connector.

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

      Standard Resistance
      for 1GR-FE (for Automatic Transmission)
      Tester Connection Condition Specified Condition
      G207-3 (EFII) - G56-8 (IMO) Always Below 1 Ω
      G207-4 (EFIO) - G56-10 (IMI) Always Below 1 Ω
      G56-8 (IMO) - Body ground Always 10 kΩ or higher
      G207-3 (EFII) - Body ground Always 10 kΩ or higher
      G56-10 (IMI) - Body ground Always 10 kΩ or higher
      G207-4 (EFIO) - Body ground Always 10 kΩ or higher
      for 1GR-FE (for Manual Transmission)
      Tester Connection Condition Specified Condition
      G207-3 (EFII) - G56-20 (IMO) Always Below 1 Ω
      G207-4 (EFIO) - G56-14 (IMI) Always Below 1 Ω
      G56-20 (IMO) - Body ground Always 10 kΩ or higher
      G207-3 (EFII) - Body ground Always 10 kΩ or higher
      G56-14 (IMI) - Body ground Always 10 kΩ or higher
      G207-4 (EFIO) - Body ground Always 10 kΩ or higher
      for 2TR-FE
      Tester Connection Condition Specified Condition
      G207-3 (EFII) - G181-9 (IMO) Always Below 1 Ω
      G207-4 (EFIO) - G181-10 (IMI) Always Below 1 Ω
      G181-9 (IMO) - Body ground Always 10 kΩ or higher
      G207-3 (EFII) - Body ground Always 10 kΩ or higher
      G181-10 (IMI) - Body ground Always 10 kΩ or higher
      G207-4 (EFIO) - Body ground Always 10 kΩ or higher
      for 1KD-FTV
      Tester Connection Condition Specified Condition
      G207-3 (EFII) - G58-29 (IMO) Always Below 1 Ω
      G207-4 (EFIO) - G58-28 (IMI) Always Below 1 Ω
      G58-29 (IMO) - Body ground Always 10 kΩ or higher
      G207-3 (EFII) - Body ground Always 10 kΩ or higher
      G58-28 (IMI) - Body ground Always 10 kΩ or higher
      G207-4 (EFIO) - Body ground Always 10 kΩ or higher
      for 1GD-FTV
      Tester Connection Condition Specified Condition
      G207-3 (EFII) - G185-17 (IMO) Always Below 1 Ω
      G207-4 (EFIO) - G185-16 (IMI) Always Below 1 Ω
      G185-17 (IMO) - Body ground Always 10 kΩ or higher
      G207-3 (EFII) - Body ground Always 10 kΩ or higher
      G185-16 (IMI) - Body ground Always 10 kΩ or higher
      G207-4 (EFIO) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  13. REPLACE ID CODE BOX (IMMOBILISER CODE ECU)


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

      Tech Tips

      Refer to Service Bulletin.

      Note

      Recognition code registration is necessary when replacing the ID code box (immobiliser code ECU).

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  14. CHECK WHETHER ENGINE STARTS


    1. Using a registered vehicle key, turn the engine switch on (IG).

    2. Check that the engine starts 5 seconds after the engine switch was turned on (IG).

      OK
      Engine starts normally.
      Result
      Proceed to
      OK
      NG (for 1GR-FE)
      NG (for 2TR-FE)
      NG (for 1KD-FTV)
      NG (for 1GD-FTV)

    OK

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

    NG (for 1GR-FE)

    REPLACE ECM Click here

    NG (for 2TR-FE)

    REPLACE ECM Click here

    NG (for 1KD-FTV)

    REPLACE ECM Click here

    NG (for 1GD-FTV)

    REPLACE ECM Click here