DTC B2799: Engine Immobilizer System Malfunction (FROM 12/2010): Procedure

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DTC OUTPUT
1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Recheck for DTCs.
  OK
  
  DTC B2799 is not output.
NG → See step 2

OK → See step 9
RE-REGISTER ECU COMMUNICATION ID
1. Re-register the ECU communication ID. Refer to REGISTRATION .
NEXT: Go to next step
CHECK DTC OUTPUT
1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Recheck for DTCs.
  OK
  
  DTC B2799 is not output.
NG → See step 4

OK → END (ECU COMMUNICATION ID WAS INCORRECT)
CHECK CONNECTOR CONNECTION CONDITION
1. Turn the engine switch off.
2. Check that the connectors are properly connected to the ECM and ID code box.
  OK
  
  Connectors are properly connected.
NG → CONNECT CONNECTORS PROPERLY

OK: Go to next step

CHECK HARNESS AND CONNECTOR (ID CODE BOX - ECM)

Disconnect the D29 ID code box and A55 ECM connectors.

Fig 1: Identifying D29 ID Code Box And A55 ECM Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Resistance

Tester Connection	Condition	Specified Condition
D29-5 (EFII) - A55-10 (IMO)	Always	Below 1 Ω
D29-6 (EFIO) - A55-11 (IMI)	Always	Below 1 Ω
D29-5 (EFII) - Body ground	Always	10 kΩ or higher
D29-6 (EFIO) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

REPLACE ECM
1. Replace the ECM. Refer to REMOVAL .
NEXT: Go to next step
REGISTER ECU COMMUNICATION ID
1. Register the ECU communication ID. Refer to REGISTRATION .
NEXT: Go to next step
CHECK DTC OUTPUT
1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Recheck for DTCs.
  OK
  
  DTC B2799 is not output.
NG → REPLACE ID CODE BOX

OK → END (ECM WAS DEFECTIVE)
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING