Dtc B2799 Engine Immobiliser System Malfunction

Vehicle Interior. Corolla. Zre142 Aze141
Theft Deterrent Keyless Entry. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC OUTPUT

RE-REGISTER ECU COMMUNICATION ID

CHECK DTC OUTPUT

CHECK CONNECTION OF CONNECTOR

CHECK HARNESS AND CONNECTOR (ID CODE BOX - ECM)

REPLACE ECM

REGISTER ECU COMMUNICATION ID

CHECK DTC OUTPUT

DTC B2799 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 ID code box (immobiliser code ECU); 2) the ECM detects errors in the communication lines; or 3) the ECU communication ID between the ID code box (immobiliser code ECU) and ECM is different and an engine start is attempted. Before troubleshooting this DTC, make sure that no certification ECU (smart key ECU assembly) DTCs are present. If present, troubleshoot the certification ECU (smart key ECU assembly) DTCs first.

DTC No.
DTC Detection Condition
Trouble Area
B2799
One of the following conditions is met:
  1. Error in communication between ECM and ID code box (immobiliser code ECU)
  2. Error in communication lines
  3. Communication ID is different between ID code box (immobiliser code ECU) and ECM during communication
  1. Wire harness or connector
  2. ECM
  3. ID code box (immobiliser code ECU)

WIRING DIAGRAM


Corolla. Zre142 Aze141.Theft Deterrent Keyless Entry.Smart Key System (For Entry Function). Dtc B2799 Engine Immobiliser System Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. If the ID code box (immobiliser code ECU) is replaced, register the ECU code and ECU communication ID (COROLLA_ZRE142 RM000000QYF05AX.html).
  2. If the ECM is replaced, register the ECU communication ID (COROLLA_ZRE142 RM000000QYF05AX.html).
1.CHECK DTC OUTPUT

  1. Clear the DTCs (COROLLA_ZRE142 RM000001GV807OX.html).

  1. Recheck for DTCs.

    OK:
    B2799 is not reoutput.


NG
Go to step 2
OK

USE SIMULATION METHOD TO CHECK (COROLLA_ZRE142 RM000000UZ108OX.html)

2.RE-REGISTER ECU COMMUNICATION ID

  1. Re-register the ECU communication ID (COROLLA_ZRE142 RM000000QYF05AX.html).


NEXT


3.CHECK DTC OUTPUT

  1. Clear the DTCs (COROLLA_ZRE142 RM000001GV807OX.html).

  1. Recheck for DTCs.

    OK:
    B2799 is not reoutput.


NG
Go to step 4
OK

END (ECU COMMUNICATION ID IS DEFECTIVE)

4.CHECK CONNECTION OF CONNECTOR

  1. Turn the engine switch off.

  1. Check that the connectors are properly connected to the ECM and ID code box (immobiliser code ECU).

    OK:
    Connectors are properly connected.


NG
CONNECT CONNECTORS PROPERLY
OK


5.CHECK HARNESS AND CONNECTOR (ID CODE BOX - ECM)

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



  1. Disconnect the ECM connector.


    Corolla. Zre142 Aze141.Theft Deterrent Keyless Entry.Smart Key System (For Entry Function). Dtc B2799 Engine Immobiliser System Malfunction

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E22-5 (EFII) - A50-10 (IMO)
    		Always
    		Below 1 Ω
    E22-6 (EFIO) - A50-11 (IMI)
    		Always
    		Below 1 Ω
    E22-5 (EFII) - Body ground
    		Always
    		10 kΩ or higher
    E22-6 (EFIO) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.REPLACE ECM

  1. Replace the ECM (COROLLA_ZRE142 RM000001CN0030X.html).


NEXT


7.REGISTER ECU COMMUNICATION ID

  1. Register the ECU communication ID (COROLLA_ZRE142 RM000000QYF05AX.html).


NEXT


8.CHECK DTC OUTPUT

  1. Clear the DTCs (COROLLA_ZRE142 RM000001GV807OX.html).

  1. Recheck for DTCs.

    OK:
    B2799 is not reoutput.


NG
REPLACE ID CODE BOX (IMMOBILISER CODE ECU) (COROLLA_ZRE142 RM000003G05004X.html)
OK

END (ECM IS DEFECTIVE)