Dtc B2799/99 Engine Immobiliser System Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

REREGISTER ECU COMMUNICATION ID

CLEAR DTC

CHECK FOR DTC

CHECK CONNECTION OF CONNECTOR

CHECK HARNESS AND CONNECTOR (SFI OR ECD COMMUNICATION LINE)

REPLACE ECM

REREGISTER ECU COMMUNICATION ID

CLEAR DTC

CHECK FOR DTC

DTC B2799/99 Engine Immobiliser System Malfunction


DESCRIPTION

This DTC is output when one of the following occurs: 1) the ECM detects errors in its own communications with the transponder key ECU assembly; 2) the ECM detects errors in the communication lines; or 3) the ECU communication ID between the transponder key ECU assembly and ECM is different and an engine start is attempted. Before troubleshooting for this DTC, make sure no transponder key ECU DTCs are present. If present, troubleshoot the transponder key ECU DTCs first.

DTC Code
DTC Detection Condition
Trouble Area
DTC Output Confirmation Operation
B2799
Either condition is met (1 trip detection logic*1):
  1. A malfunction occurs in the communication or communication lines between the ECM and transponder key ECU assembly.
  2. A communication code cannot be verified during communication between the ECM and transponder key ECU assembly.
  1. Harness or connector
  2. Transponder key ECU assembly
  3. ECM
Either condition is met:
  1. Within 10 seconds of an engine start operation being performed (with the shift lever in P and the brake pedal*2 or clutch pedal*3 depressed, turn the ignition switch to ON). 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).
  2. 10 seconds after the ignition switch is turned to ON after reconnecting the cable to the negative (-) battery terminal (communication begins within 3 seconds of the ignition switch being turned to ON, and DTCs are stored after 6 seconds).
  1. *1: Only output while a malfunction is present.
  2. *2: for Automatic Transmission
  3. *3: for Manual Transmission

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 Code
Data List and Active Test
B2799
-

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Engine Immobiliser.Engine Immobiliser System. Dtc B2799/99 Engine Immobiliser System Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. The fixed 12 V power source voltage in the ECM is output through a resistance from terminal IMI. The transponder key ECU assembly grounds or does not ground this power source voltage accordingly.
  2. The fixed 12 V power source voltage in the transponder key ECU assembly is output through a resistance from terminal EFII. The ECM grounds or does not ground this power source voltage accordingly.
  3. When replacing the transponder key ECU assembly or ECM, refer to the Service Bulletin.
  4. After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.
HINT:
After troubleshooting for this DTC, make sure B2799 is not present. If present, troubleshoot the blocking system DTCs next.
1.CLEAR DTC

  1. Clear the DTCs (Toyota Fortuner RM000000Z3I008X.html).


NEXT


2.CHECK FOR DTC

  1. Check for the DTCs (Toyota Fortuner RM000000Z3I008X.html).

    OK:
    DTC B2799/99 is not output.


NG
Go to step 3
OK

USE SIMULATION METHOD TO CHECK (Toyota Fortuner RM0000012Q9013X.html)

3.REREGISTER ECU COMMUNICATION ID

  1. Reregister the ECU - ECM communication ID (Refer to Service Bulletin).


NEXT


4.CLEAR DTC

  1. Clear the DTCs (Toyota Fortuner RM000000Z3I008X.html)


NEXT


5.CHECK FOR DTC

  1. Check for the DTCs (Toyota Fortuner RM000000Z3I008X.html).

    OK:
    DTC B2799/99 is not output.


NG
Go to step 6
OK

END (ECU COMMUNICATION ID IS NOT REGISTERED CORRECTLY)

6.CHECK CONNECTION OF CONNECTOR

  1. Turn the ignition switch off.

  1. Check that the connectors are properly connected to the ECM and transponder key ECU assembly.

    OK:
    Connectors are properly connected.


NG
CONNECT CONNECTOR CORRECTLY
OK


7.CHECK HARNESS AND CONNECTOR (SFI OR ECD COMMUNICATION LINE)

  1. Disconnect the T21 transponder key ECU assembly connector.

  1. Disconnect the E5*1, E9*2 or E13*3 ECM connector.

    1. *1: for 1KD-FTV, 2KD-FTV
    2. *2: for 2TR-FE
    3. *3: for 1GR-FE

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

    Standard Resistance:
    for 1KD-FTV, 2KD-FTV:
    Tester Connection
    		Condition
    		Specified Condition
    T21-13 (EFIO) - E5-30 (IMI)
    		Always
    		Below 1 Ω
    T21-12 (EFII) - E5-29 (IMO)
    		Always
    		Below 1 Ω
    T21-13 (EFIO) or E5-30 (IMI) - Body ground
    		Always
    		10 kΩ or higher
    T21-12 (EFII) or E5-29 (IMO) - Body ground
    		Always
    		10 kΩ or higher
    for 2TR-FE:
    Tester Connection
    		Condition
    		Specified Condition
    T21-13 (EFIO) - E9-16 (IMI)
    		Always
    		Below 1 Ω
    T21-12 (EFII) - E9-15 (IMO)
    		Always
    		Below 1 Ω
    T21-13 (EFIO) or E9-16 (IMI) - Body ground
    		Always
    		10 kΩ or higher
    T21-12 (EFII) or E9-15 (IMO) - Body ground
    		Always
    		10 kΩ or higher
    for 1GR-FE:
    Tester Connection
    		Condition
    		Specified Condition
    T21-13 (EFIO) - E13-16 (IMI)
    		Always
    		Below 1 Ω
    T21-12 (EFII) - E13-15 (IMO)
    		Always
    		Below 1 Ω
    T21-13 (EFIO) or E13-16 (IMI) - Body ground
    		Always
    		10 kΩ or higher
    T21-12 (EFII) or E13-15 (IMO) - Body ground
    		Always
    		10 kΩ or higher

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

    Standard Resistance:
    for 1KD-FTV, 2KD-FTV:
    Tester Connection
    		Condition
    		Specified Condition
    T21-13 (EFIO) or E5-30 (IMI) - Body ground
    		Always
    		Below 1 V
    T21-12 (EFII) or E5-29 (IMO) - Body ground
    		Always
    		Below 1 V
    for 2TR-FE:
    Tester Connection
    		Condition
    		Specified Condition
    T21-13 (EFIO) or E9-16 (IMI) - Body ground
    		Always
    		Below 1 V
    T21-12 (EFII) or E9-15 (IMO) - Body ground
    		Always
    		Below 1 V
    for 1GR-FE:
    Tester Connection
    		Condition
    		Specified Condition
    T21-13 (EFIO) or E13-16 (IMI) - Body ground
    		Always
    		Below 1 V
    T21-12 (EFII) or E13-15 (IMO) - Body ground
    		Always
    		Below 1 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.REPLACE ECM

  1. Temporarily replace the ECM with a new one.

    1. for 1KD-FTV: Toyota Fortuner RM0000013Z0004X.html
    2. for 2KD-FTV: Toyota Fortuner RM0000043H100CX.html
    3. for 2TR-FE: Toyota Fortuner RM000000VW200JX.html
    4. for 1GR-FE: Toyota Fortuner RM000000VW200DX.html

NEXT


9.REREGISTER ECU COMMUNICATION ID

  1. Reregister the ECU - ECM communication ID (Refer to Service Bulletin).


NEXT


10.CLEAR DTC

  1. Clear the DTCs (Toyota Fortuner RM000000Z3I008X.html).


NEXT


11.CHECK FOR DTC

  1. Check for the DTCs (Toyota Fortuner RM000000Z3I008X.html).

    OK:
    DTC B2799/99 is not output.


NG
REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK

END (ECM IS DEFECTIVE)