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Last Modified: 11-27-2007 1.6 C
Service Category: Vehicle Interior Section: Theft Deterrent/Keyless Entry
Model Year: 2008 Model: LX570 Doc ID: RM000002M6X00MX
Title: THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM: DESCRIPTION (2008 LX570)

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 ID code box (immobiliser code ECU); 2) the ECM detects errors in the communication lines; or 3) the ECU communication ID between the ID code box (immobiliser code ECU) and ECM is different and an engine start is attempted.

Before troubleshooting for this DTC, make sure no certification ECU DTCs are output. If output, troubleshoot the certification ECU DTCs first.

DTC Code

DTC Detection Condition

Trouble Area

B2799

One of the following conditions is met:

  • An error in the communication between the ECM and the ID code box (immobiliser code ECU).
  • An error in the communication lines.
  • The communication ID is different during communication with the ID code box (immobiliser code ECU).
  • Harness or connector
  • ECM
  • ID code box (immobiliser code ECU)

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM: DTC CHECK / CLEAR (2008 LX570) .

NEXT

2.

CHECK FOR DTC

(a) Check for DTCs THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM: DTC CHECK / CLEAR (2008 LX570) .

OK:

DTC B2799 is not output.

OK

3.

REREGISTER ECU CODE

(a) Reregister the recognition codes in the ECUs THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM: REGISTRATION (2008 LX570) .

NEXT

4.

CLEAR DTC

(a) Clear the DTCs THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM: DTC CHECK / CLEAR (2008 LX570) .

NEXT

5.

CHECK FOR DTC

(a) Check for DTCs THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM: DTC CHECK / CLEAR (2008 LX570) .

OK:

DTC B2799 is not output.

OK

6.

CHECK CONNECTION OF CONNECTOR

(a) Turn the engine switch off.

(b) Check that the connectors are properly connected to the ECM and the ID code box (immobiliser code ECU).

OK:

Connectors are properly connected.

OK

7.

CHECK HARNESS AND CONNECTOR (ID CODE BOX - ECM)


(a) Disconnect the E28 box connector.

(b) Disconnect the A38 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

E28-5 (EFII) - A38-29 (IMO)

Always

Below 1 Ω

E28-6 (EFIO) - A38-40 (IMI)

E28-5 (EFII) or A38-29 (IMO) - Body ground

Always

10 kΩ or higher

E28-6 (EFIO) or A38-40 (IMI) - Body ground
OK

8.

REPLACE ECM

(a) Temporarily replace the ECM with a new one 3UR-FE ENGINE CONTROL: ECM: REMOVAL (2008 LX570) .

NEXT

9.

REGISTER ECU CODE

(a) Register the recognition codes in the ECUs THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM: REGISTRATION (2008 LX570) .

NEXT

10.

CLEAR DTC

(a) Clear the DTCs THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM: DTC CHECK / CLEAR (2008 LX570) .

NEXT

11.

CHECK FOR DTC

(a) Check for DTCs THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM: DTC CHECK / CLEAR (2008 LX570) .

OK:

DTC B2799 is not output.

OK