DTC    B2799    Engine Immobiliser System Malfunction

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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; 2) the ECM detects errors in the communication lines; or 3) the ECU communication ID between the transponder key ECU 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
B2799
One of following conditions is met:
  1. Error in communication between ECM and transponder key ECU
  2. Error in communication lines
  3. Communication ID is different during communication with transponder key ECU
  1. Wire harness
  2. Transponder key ECU
  3. ECM

WIRING DIAGRAM


B121684E04


INSPECTION PROCEDURE

1.CHECK FOR DTC

  1. Clear the DTC (Click here).

  1. Recheck for DTC.

    OK:
    B2799 output does not reoccur.


NG
Go to step 2
OK

USE SIMULATION METHOD TO CHECK (Click here)  

2.CHECK WIRE HARNESS (TRANSPONDER KEY ECU - ECM)
E180672E07

  1. Disconnect the E50 ECU connector.

  1. Disconnect the A12 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E50-13 (EFIO) - A12-16 (IMI)
    		Always
    		Below 1 Ω
    E50-12 (EFII) - A12-15 (IMO)
    		Always
    E50-13 (EFIO) or A12-16 (IMI) - Body ground
    		Always
    		10 kΩ or higher
    E50-12 (EFII) or A12-15 (IMO) - Body ground
    		Always


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK TRANSPONDER KEY ECU (OPERATION)

  1. Temporarily replace the transponder key ECU with a new one.

  1. Check that the engine starts normally.

    OK:
    Engine starts normally.
    Result 
    Result
    		Proceed to
    OK
    		A
    NG (for 2AD-FHV)
    		B
    NG (for 2AD-FTV)
    		C


B
REPLACE ECM (Click here)

C
REPLACE ECM (Click here)
A

END (TRANSPONDER KEY ECU IS DEFECTIVE)