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

DTC Code	DTC Name
B2799	Engine Immobiliser System Malfunction

DESCRIPTION

The ECM stores this DTC when the communication line between the ECM and transponder key ECU assembly is malfunctioning or the communication ID of the ECM and transponder key ECU assembly do not match.

DTC No.	DTC Detection Condition	Trouble Area	DTC Output Confirmation Operation
B2799	One of the following conditions is met: Error in communication between ECM and transponder key ECU assembly. Error in communication lines. Communication ID is different during communication between ECM and transponder key ECU assembly.	Wire harness or connector Transponder key ECU assembly ECM	Start the engine and wait 10 seconds.1 After disconnecting and reconnecting the cable to the negative (-) battery terminal, turn the ignition switch to ON and wait 10 seconds.2

DTC No.

DTC Detection Condition

Trouble Area

DTC Output Confirmation Operation

B2799

One of the following conditions is met:

Error in communication between ECM and transponder key ECU assembly.
Error in communication lines.
Communication ID is different during communication between ECM and transponder key ECU assembly.

Wire harness or connector
Transponder key ECU assembly
ECM

Start the engine and wait 10 seconds.*1
After disconnecting and reconnecting the cable to the negative (-) battery terminal, turn the ignition switch to ON and wait 10 seconds.*2

*1: Communication starts within 3 seconds of starting the engine. If verification fails, this DTC is stored 6 seconds after communication has completed.
*2: Communication starts within 3 seconds of turning the ignition switch to ON. If verification fails, this DTC is stored 6 seconds after communication has completed.

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected	Fail-safe Operation when Malfunction Detected
Engine cannot be started	-

Related Data List and Active Test
DTC No.	Data List and Active Test
B2799	-

WIRING DIAGRAM


*1	Transponder Key ECU Assembly

CAUTION / NOTICE / HINT

Note

If the transponder key ECU assembly or ECM is replaced, refer to the Service Bulletin.
After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
When using the GTS with the vehicle ignition switch off, connect the GTS to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Immobiliser. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

Tech Tips

If transponder key ECU assembly DTCs are output simultaneously, troubleshoot the transponder key ECU assembly DTCs first.

PROCEDURE

CLEAR DTC
1. Clear the DTC Click here.
NEXT

CHECK FOR DTC

Start the engine.

Check for DTCs Click here.

Tech Tips

Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

Result
Result	Proceed to
DTC is not output	A
DTC B2799 is output	B
Other DTCs are output	C

USE SIMULATION METHOD TO CHECK Click here

GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

REGISTER ECU COMMUNICATION ID
1. Reregister the ECU communication ID.
  
  Tech Tips
  
  Refer to the Service Bulletin.
NEXT
CHECK WHETHER ENGINE STARTS
1. Using a registered key, turn the ignition switch to ON.
2. Check that the engine starts 5 seconds after the ignition switch was turned to ON.
  
  OK
  
  Engine starts normally.
OK
END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)

NG

INSPECT ECM (IMO TERMINAL VOLTAGE)

Disconnect the A58*1 or A59*2 ECM connector.
Turn the ignition switch to ON.

Text in Illustration
*A	for 1NR-FE
*B	for 1ND-TV
*a	Front view of wire harness connector (to ECM)

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

*1: for 1NR-FE
*2: for 1ND-TV

Measurement value

Tester Connection

Switch Condition

Result

A58-29 (IMO) - Body ground*1

A58-78 (IMO) - Body ground*2

Ignition switch turned to ON using registered key

Terminal IMO stuck low (2.4 V or less)

Terminal IMO stuck high (12 V) or abnormal waveform

*1: for 1NR-FE
*2: for 1ND-TV

Result
Result	Proceed to
Terminal IMO stuck low (2.4 V or less)	A
Terminal IMO stuck high (12 V) or abnormal waveform	B

REPLACE ECM Click here

CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM)

Disconnect the F54 transponder key ECU assembly connector.
Disconnect the A58*1 or A59*2 ECM connector.

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

*1: for 1NR-FE
*2: for 1ND-TV

Standard Resistance (Check for Open)

Tester Connection	Condition	Specified Condition
F54-12 (EFII) - A58-29 (IMO)*1	Always	Below 1 Ω
F54-12 (EFII) - A58-78 (IMO)*2	Always	Below 1 Ω
F54-13 (EFIO) - A58-28 (IMI)*1	Always	Below 1 Ω
F54-13 (EFIO) - A59-77 (IMI)*2	Always	Below 1 Ω

Standard Resistance (Check for Short)

Tester Connection	Condition	Specified Condition
F54-12 (EFII) or A58-29 (IMO) - Body ground*1	Always	10 kΩ or higher
F54-12 (EFII) or A59-78 (IMO) - Body ground*2	Always	10 kΩ or higher
F54-13 (EFIO) or A58-28 (IMI) - Body ground*1	Always	10 kΩ or higher
F54-13 (EFIO) or A59-77 (IMI) - Body ground*1	Always	10 kΩ or higher

*1: for 1NR-FE
*2: for 1ND-TV

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE TRANSPONDER KEY ECU ASSEMBLY
1. Replace the transponder key ECU assembly with a new one.
  
  Tech Tips
  
  Refer to the Service Bulletin.
  
  Note
  
  Key ID code registration is necessary when replacing the transponder key ECU assembly. Refer to the Service Bulletin.
NEXT

CHECK WHETHER ENGINE STARTS

Using a registered key, turn the ignition switch to ON.

Check that the engine starts 5 seconds after the ignition switch was turned to ON.

OK
Engine starts normally.

Result
Result	Proceed to
OK	A
NG (for 1NR-FE)	B
NG (for 1ND-TV)	C

END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)

REPLACE ECM Click here

REPLACE ECM
1. Temporarily replace the ECM with a new one.
  - for 1NR-FE Click here
  - for 1ND-TV Click here
NEXT
REGISTER ECU COMMUNICATION ID
1. Reregister the ECU communication ID.
  
  Tech Tips
  
  Refer to the Service Bulletin.
NEXT
CHECK WHETHER ENGINE STARTS
1. Using a registered key, turn the ignition switch to ON.
2. Check that the engine starts 5 seconds after the ignition switch was turned to ON.
  
  OK
  
  Engine starts normally.
OK
END (ECM WAS DEFECTIVE)

NG
REPLACE TRANSPONDER KEY ECU ASSEMBLY