ENGINE IMMOBILISER SYSTEM(w/o Entry and Start System), Diagnostic DTC:B2799

DTC Code	DTC Name
B2799	Engine Immobiliser System Malfunction

DESCRIPTION

This DTC is stored when one of the following occurs: 1) the ECM detected errors in its own communications with the transponder key ECU; 2) the ECM detects errors in the communication lines; or 3) the ECU - ECM 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 engine immobiliser DTCs are output. If output, troubleshoot the engine immobiliser DTCs first.

DTC Code	DTC Detection Condition	Trouble Area
B2799	One of the following conditions is met: An error in communication between the ECM and transponder key ECU. An error in the communication lines. The ECU - ECM communication ID is different during communication with the transponder key ECU.	Harness or connector Transponder key ECU ECM

DTC Code

DTC Detection Condition

Trouble Area

B2799

One of the following conditions is met:

An error in communication between the ECM and transponder key ECU.
An error in the communication lines.
The ECU - ECM communication ID is different during communication with the transponder key ECU.

Harness or connector
Transponder key ECU
ECM

WIRING DIAGRAM


*1	Transponder Key ECU

CAUTION / NOTICE / HINT

Tech Tips

When the transponder key ECU and/or ECM is replaced, reregister the ECU - ECM communication ID.

PROCEDURE

CLEAR DTC
1. Clear the DTC Click here.
NEXT
CHECK FOR DTC
1. Check for DTC Click here.
  
  OK
  
  DTC B2799 is not output.
OK
USE SIMULATION METHOD TO CHECK Click here

NG
REREGISTER ECU - ECM COMMUNICATION ID
1. Reregister the ECU - ECM communication ID.
NEXT
CLEAR DTC
1. Clear the DTCs Click here.
NEXT
CHECK FOR DTC
1. Check for DTCs Click here.
  
  OK
  
  DTC B2799 is not output.
OK
END

NG
CHECK CONNECTION OF CONNECTOR
1. Turn the ignition switch off.
2. Check that the connectors are properly connected to the ECM and the transponder key ECU.
  
  OK
  
  Connectors are properly connected.
NG
CONNECT CONNECTOR CORRECTLY

OK

OK
DTC B2799 is not output.

OK
DTC B2799 is not output.

OK
Connectors are properly connected.

CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM)

Text in Illustration
*1	Front view of wire harness connector (to Transponder Key ECU)
*2	Front view of wire harness connector (to ECM)

Disconnect the D102 ECU connector.
Disconnect the A40 ECM connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
D102-13 (EFIO) - A40-11 (IMI)	Always	Below 1 Ω
D102-12 (EFII) - A40-10 (IMO)	Always	Below 1 Ω
D102-13 (EFIO) or A40-11 (IMI) - Body ground	Always	10 kΩ or higher
D102-12 (EFII) or A40-10 (IMO) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE TRANSPONDER KEY ECU
1. Temporarily replace the transponder key ECU with a new one.
NEXT
CLEAR DTC
1. Clear the DTCs Click here.
NEXT
CHECK FOR DTC
1. Check for DTCs Click here.
  
  OK
  
  DTC B2799 is not output.
  Tech Tips
  - Replace the ECM (for 1ZR-FAE) Click here.
  - Replace the ECM (for 2ZR-FAE) Click here.
  - Replace the ECM (for 3ZR-FAE) Click here.
  - Replace the ECM (for 3ZR-FE) Click here.
OK
END (TRANSPONDER KEY ECU IS DEFECTIVE)

NG
REPLACE ECM