Theft Deterrent Keyless Entry. Dtc B2799 Engine Immobiliser System Malfunction

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200

Theft Deterrent Keyless Entry. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

INSPECT ECM (TERMINAL IMO)

INSPECT ECM (TERMINAL IMI)

CHECK WHETHER ENGINE STARTS

INSPECT ECM (IMO TERMINAL VOLTAGE)

CHECK HARNESS AND CONNECTOR (ECM - TRANSPONDER KEY ECU AND BODY GROUND)

REPLACE TRANSPONDER KEY ECU ASSEMBLY

CHECK WHETHER ENGINE STARTS

REPLACE ECM

CHECK WHETHER ENGINE STARTS

DTC B2799 Engine Immobiliser System Malfunction

DESCRIPTION

This DTC is stored 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 - ECM 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 no engine immobiliser DTCs are output. If output, troubleshoot the engine immobiliser DTCs first.

DTC Code	DTC Detection Condition	Trouble Area	DTC Output Confirmation Operation
B2799	Either condition is met (1 trip detection logic*3): A malfunction occurs in the communication or communication lines between the ECM and transponder key ECU assembly. A communication code cannot be verified during communication between the ECM and transponder key ECU assembly.	Harness or connector Transponder key ECU assembly ECM	Either condition is met: Within 10 seconds of an engine start operation being performed an engine start operation refers to turning the ignition switch to ON with the shift lever in P and the brake pedal depressed1, or the shift lever in N and the brake pedal and clutch pedal depressed2. If there is a malfunction, the engine stops (communication begins within 3 seconds of the engine start operation being performed, and DTCs are stored after 6 seconds). 10 seconds after the ignition switch is turned to ON after reconnecting the cable to the negative (-) battery terminal (communication begins within 3 seconds of the ignition switch being turned to ON, and DTCs are stored after 6 seconds).

*1: for Automatic Transmission
*2: for Manual Transmission

*3: Only output while a malfunction is present.

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 Code	Data List and Active Test
B2799	-

WIRING DIAGRAM

Land Cruiser. Urj200, 202 Grj200 Vdj200.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function).
Dtc
B2799 Engine Immobiliser System Malfunction

INSPECTION PROCEDURE

NOTICE:

When replacing the transponder key ECU assembly, refer to the Service Bulletin.
When replacing the ECM, refer to Initialization (Click here).
After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

1.CLEAR DTC

Clear the DTCs (Click here).

NEXT

2.CHECK FOR DTC

Start the engine.

Wait 10 seconds or more.

Check for DTCs (Click here).
HINT:
Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.
OK:
DTC B2799 is not output.
Result
Result
Proceed to
OK
A
NG (DTC B2799 is output)
B
NG (Other DTCs are output)
C

Go to step 3

GO TO DIAGNOSTIC TROUBLE CODE CHART (Click here)

USE SIMULATION METHOD TO CHECK (Click here)

3.INSPECT ECM (TERMINAL IMO)

Using an oscilloscope, check the waveform.

Text in Illustration
*A	for LHD	*B	for RHD
*a	Component with harness connected (ECM)	*b	Waveform

Measurement Condition
Item	Content
Tester Connection	A38-10 (IMO) - Body ground1 A52-10 (IMO) - Body ground2
Tool Setting	2 V/DIV., 500 ms./DIV.
Condition	Within 3 seconds after starter operates and initial combustion occurs, or within 3 seconds after ignition switch first turned to ON after battery disconnected and reconnected

*1: for LHD
*2: for RHD

HINT:

The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

OK:: Waveform is output normally (refer to illustration).

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

Go to step 7

Go to step 13

A

4.INSPECT ECM (TERMINAL IMI)

Using an oscilloscope, check the waveform.

Text in Illustration
*A	for LHD	*B	for RHD
*a	Component with harness connected (ECM)	*b	Waveform

Measurement Condition
Item	Content
Tester Connection	A38-11 (IMI) - Body ground1 A52-11 (IMI) - Body ground2
Tool Setting	2 V/DIV., 500 ms./DIV.
Condition	Within 3 seconds after starter operates and initial combustion occurs, or within 3 seconds after ignition switch first turned to ON after battery disconnected and reconnected

*1: for LHD
*2: for RHD

HINT:

The waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

OK:: Waveform is output normally (refer to illustration).

Result
Result	Proceed to
Normal waveform	A
Not output waveform or abnormal waveform	B

Go to step 9

A

5.REGISTER ECU COMMUNICATION ID

Reregister the ECU communication ID (refer to the Service Bulletin).

NEXT

6.CHECK WHETHER ENGINE STARTS

Check that the engine starts with an already registered vehicle key.
OK:
Engine starts normally.

Go to step 13

END (COMMUNICATION ID REGISTRATION WAS DEFECTIVE)

7.INSPECT ECM (IMO TERMINAL VOLTAGE)

Disconnect the A38*1 or A52*2 ECM connector.
1. *1: for LHD
2. *2: for RHD

Turn the ignition switch to ON.

Measure the voltage according to the value(s) in the table below.
Text in Illustration
*A
for LHD
*B
for RHD
*a
Front view of wire harness connector
(to ECM)
Result
Result
Proceed to
Terminal IMO stuck low (2.4 V or less)
A
Terminal IMO stuck high (12 V)
B

Text in Illustration
*A	for LHD
*B	for RHD
*a	Front view of wire harness connector (to ECM)

Go to step 13

A

8.CHECK HARNESS AND CONNECTOR (ECM - TRANSPONDER KEY ECU AND BODY GROUND)

Disconnect the E96 transponder key ECU assembly connector.

Disconnect the A38*1 or A52*2 ECM connector.
1. *1: for LHD
2. *2: for RHD

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

Standard Resistance:
for LHD
Tester Connection
Condition
Specified Condition
E96-12 (EFII) - A38-10 (IMO)
Always
Below 1 Ω
F96-12 (EFII) - Body ground
Always
10 kΩ or higher
for RHD
Tester Connection
Condition
Specified Condition
E96-12 (EFII) - A52-10 (IMO)
Always
Below 1 Ω
E96-12 (EFII) - Body ground
Always
10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.REPLACE TRANSPONDER KEY ECU ASSEMBLY

Replace the transponder key ECU assembly (refer to the Service Bulletin).

NEXT

10.REGISTER KEY

Reregister the key (refer to the Service Bulletin).

NEXT

11.REGISTER ECU COMMUNICATION ID

Reregister the ECU communication ID (refer to the Service Bulletin).

NEXT

12.CHECK WHETHER ENGINE STARTS

Check that the engine starts with an already registered vehicle key.
OK:
Engine starts normally.
Result
Result
Proceed to
OK
A
NG (for 1GR-FE)
B
NG (for 1VD-FTV)
C

REPLACE ECM (Click here)

END (TRANSPONDER KEY ECU WAS DEFECTIVE)

13.REPLACE ECM

Temporarily replace the ECM with a new one.
HINT:
1. for 1GR-FE (Click here).
2. for 1VD-FTV (Click here).

NEXT

14.REGISTER ECU COMMUNICATION ID

Reregister the ECU communication ID (refer to the Service Bulletin).

NEXT

15.CHECK WHETHER ENGINE STARTS

Check that the engine starts with the key.
OK:
Engine starts normally.

REPLACE TRANSPONDER KEY ECU ASSEMBLY

END (ECM WAS DEFECTIVE)

Result	Proceed to
OK	A
NG (DTC B2799 is output)	B
NG (Other DTCs are output)	C

Tester Connection	Condition	Specified Condition
E96-12 (EFII) - A38-10 (IMO)	Always	Below 1 Ω
F96-12 (EFII) - Body ground	Always	10 kΩ or higher