Toyota Venza: Engine Immobiliser System Malfunction (B2799)

Toyota Venza Service Manual / Theft Deterrent / Keyless Entry / Engine Immobiliser System(w/o Smart Key System) / Engine Immobiliser System Malfunction (B2799)

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 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 that no transponder key ECU assembly DTCs are present. If present, troubleshoot the transponder key ECU assembly DTCs first.

DTC No.	DTC Detection Condition	Trouble Area
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 with transponder key ECU assembly.	Wire harness or connector ECM Transponder key ECU assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

If the transponder key ECU assembly is replaced, register the key and ECU communication ID (See page ).
If the ECM is replaced, register the ECU communication ID (See page ).

PROCEDURE

1.	CHECK DTC OUTPUT

(a) Clear the DTCs (See page ).

(b) Recheck for DTCs (See page ).

OK:

DTC B2799 is not output.

USE SIMULATION METHOD TO CHECK

2.	RE-REGISTER ECU COMMUNICATION ID

(a) Re-register the ECU communication ID (See page ).

3.	CHECK DTC OUTPUT

(a) Clear the DTCs (See page ).

(b) Recheck for DTCs (See page ).

OK:

DTC B2799 is not output.

END (ECU COMMUNICATION ID WAS NOT REGISTERED CORRECTLY)

4.	CHECK CONNECTION OF CONNECTOR

(a) Turn the ignition switch off.

(b) Check that the connectors are properly connected to the ECM and transponder key ECU assembly.

OK:

Connectors are properly connected.

CONNECT CONNECTORS PROPERLY

5.	CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - ECM)

(a) Disconnect the transponder key ECU assembly connector.

(b) Disconnect the ECM connector.

Standard Resistance:

for 2GR-FE

Tester Connection	Condition	Specified Condition
D22-12 (EFII) - A41-29 (IMO)	Always	Below 1 Ω
D22-13 (EFIO) - A41-40 (IMI)	Always	Below 1 Ω
D22-12 (EFII) - Body ground	Always	10 kΩ or higher
D22-13 (EFIO) - Body ground	Always	10 kΩ or higher
A41-29 (IMO) - Body ground	Always	10 kΩ or higher
A41-40 (IMI) - Body ground	Always	10 kΩ or higher

for 1AR-FE

Tester Connection	Condition	Specified Condition
D22-12 (EFII) - A49-10 (IMO)	Always	Below 1 Ω
D22-13 (EFIO) - A49-11 (IMI)	Always	Below 1 Ω
D22-12 (EFII) - Body ground	Always	10 kΩ or higher
D22-13 (EFIO) - Body ground	Always	10 kΩ or higher
A49-10 (IMO) - Body ground	Always	10 kΩ or higher
A49-11 (IMI) - Body ground	Always	10 kΩ or higher

Text in Illustration

*1	Front view of wire harness connector (to Transponder Key ECU Assembly)
*2	Front view of wire harness connector (to ECM)
*3	for 2GR-FE
*4	for 1AR-FE

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	REPLACE ECM

(a) Replace the ECM (See page for 2GR-FE,
for 1AR-FE).

7.	REGISTER ECU COMMUNICATION ID

(a) Register the ECU communication ID (See page ).

8.	CHECK DTC OUTPUT

(a) Clear the DTCs (See page ).

(b) Recheck for DTCs (See page ).

OK:

DTC B2799 is not output.

END (ECM WAS DEFECTIVE)

REPLACE TRANSPONDER KEY ECU ASSEMBLY

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