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:

Installation
1. INSTALL REAR AXLE HUB & BEARING ASSEMBLY LH (a) Install the hub & bearing assembly LH with the 4 bolts. Torque: 56 N*m (571 kgf*cm, 41 ft.*lbf) 2. INSPECT BEARING BACKLASH (See page AH-19) 3. INSPECT AXLE HUB DEVIATION (See page AH-19) 4. INSTALL REAR DRIVE SHAFT ASSEMBLY LH (Se ...

Rear Speed Sensor RH Circuit
DESCRIPTION Refer to DTCs C0200/31, C0205/32, C1235/35, and C1236/36 (See page BC-17). DTCs C1273/73 to C1278/78 can be deleted when the speed sensor sends a vehicle speed signal or the Test Mode ends. DTCs C1273/73 to C1278/78 are output only in the Test Mode. HINT: DTC C0210/33 ...

Removal
1. REMOVE ENGINE ASSEMBLY WITH TRANSAXLE HINT: (See page EM-26) 2. REMOVE FRONT DRIVE SHAFT ASSEMBLY LH HINT: (See page DS-6) 3. REMOVE FRONT DRIVE SHAFT ASSEMBLY RH HINT: (See page DS-6) 4. REMOVE TRANSMISSION CONTROL CABLE CLAMP (a) Remove the bolt and the transmission control cable cla ...