Toyota Sienna Service Manual: Engine Immobiliser System Malfunction

Toyota Sienna Service Manual / Engine immobiliser / Problem symptoms table / Diagnostic trouble code chart / Engine Immobiliser System Malfunction

DTC B2799 Engine Immobiliser System Malfunction

DESCRIPTION

This DTC is output when the ECM detects errors in communication between the transponder key ECU and the ECM, or in the communication lines. This DTC is also output when an engine start is attempted while the ECU communication ID between the transponder key ECU and the ECM are different. Before troubleshooting for this DTC, make sure that there is no DTC detected in the transponder key ECU. If there is key code-related DTC detected in the transponder key ECU, repair it first.

DTC No.	DTC Detection Condition	Trouble Area
B2799	Error in communication between ECM and transponder key ECU, and in communication line Communication ID is different during communication with transponder key ECU	Wire harness Transponder key ECU assembly Transponder key amplifier ECM

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

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

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

Disconnect the T6 ECU and E5 ECM connectors.
Check the resistance of the wire harness side connectors.

Resistance

Resistance

2 CHECK TRANSPONDER KEY ECU ASSEMBLY

After replacing the transponder key ECU assembly with a normally functioning transponder key ECU assembly, check that the engine starts.

OK: The engine starts

END

No Communication in Immobiliser System

DTC B2796 No Communication in Immobiliser System DTC B2798 Communication Malfunction No. 2 DESCRIPTION These codes are stored in the memory when a key that does not have a transponder chip is ins ...

Cruise control

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Other materials:

Inspection
1. INSPECT POWER STEERING RACK (a) Using a dial indicator, check the power steering rack for runout and for teeth wear and damage. Maximum runout: 0.3 mm (0.012 in.) If necessary, replace the rack & pinion power steering gear assembly. (b) Check the back surface for wear and damag ...

Removal
1. REMOVE FRONT SEAT INNER BELT ASSEMBLY HINT: Refer to the instructions for disassembly of the front seat assembly (for flat type). Refer to the instructions for disassembly of the front seat assembly (for manual seat). Refer to the instructions for disassembly of the ...

Removal
1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 2. DRAIN ENGINE COOLANT 3. REMOVE FRONT WIPER ARM HEAD CAP (See page WW-4) 4. REMOVE FRONT WIPER ARM RH (See page WW-4) 5. REMOVE FRONT WIPER ARM LH (See page WW-4) 6. REMOVE COWL TOP VENTILATOR LOUVER SUBASSEMBLY (See page WW-4) 7. REMOVE ...