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 (TRANSPONDER KEY ECU - 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 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 that no transponder key ECU assembly DTCs are present. If present, troubleshoot the transponder key ECU assembly DTCs first.

DTC No.
DTC Detection Condition
Trouble Area
B2799
One of following conditions is met:
  1. Error in communication between ECM and transponder key ECU assembly
  2. Error in communication lines
  3. Communication ID is different during communication with transponder key ECU assembly
  1. Wire harness or connector
  2. ECM
  3. Transponder key ECU assembly

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 transponder key ECU assembly is replaced, register the key and ECU communication ID (COROLLA_ZRE142 RM00000120Y02CX.html).
  2. If the ECM is replaced, register the ECU communication ID (COROLLA_ZRE142 RM00000120Y02CX.html).
1.CHECK DTC OUTPUT

  1. Clear the DTCs (COROLLA_ZRE142 RM000001GV807PX.html).

  1. Recheck for DTCs.

    OK:
    DTC 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 RM00000120Y02CX.html).


NEXT


3.CHECK DTC OUTPUT

  1. Clear the DTCs (COROLLA_ZRE142 RM000001GV807PX.html).

  1. Recheck for DTCs.

    OK:
    DTC B2799 is not reoutput.


NG
Go to step 4
OK

END (ECU COMMUNICATION ID IS DEFECTIVE)

4.CHECK CONNECTION OF CONNECTOR

  1. Turn the ignition switch off.

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

    OK:
    Connectors are properly connected.


NG
CONNECT CONNECTORS PROPERLY
OK


5.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM)

  1. Disconnect the transponder key ECU assembly 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
    E21-12 (EFII) - A50-10 (IMO)
    		Always
    		Below 1 Ω
    E21-13 (EFIO) - A50-11 (IMI)
    		Always
    		Below 1 Ω
    E21-12 (EFII) - Body ground
    		Always
    		10 kΩ or higher
    E21-13 (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 for 2ZR-FE)
    (COROLLA_ZRE142 RM000002WT506MX.html for 2AZ-FE)


NEXT


7.REGISTER ECU COMMUNICATION ID

  1. Register the ECU communication ID (COROLLA_ZRE142 RM00000120Y02CX.html).


NEXT


8.CHECK DTC OUTPUT

  1. Clear the DTCs (COROLLA_ZRE142 RM000001GV807PX.html).

  1. Recheck for DTCs.

    OK:
    DTC B2799 is not reoutput.


NG
REPLACE TRANSPONDER KEY ECU ASSEMBLY (COROLLA_ZRE142 RM000003G05004X.html)
OK

END (ECM IS DEFECTIVE)