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:

Reassembly
1. INSTALL INPUT SHAFT OIL SEAL RING (a) Compress a new input shaft oil seal ring from both sides to reduce dimension A. Dimension A: 5 mm (0.197 in.) (b) Coat the oil seal ring with ATF and install it to the input shaft. NOTICE: Do not expand the end gap of the oil seal ring too much. ...

Room temperature sensor
On-vehicle inspection 1. INSPECT A/C ROOM TEMPERATURE SENSOR (a) Remove the A/C room temperature sensor. (b) Measure the resistance according to the value(s) in the table below. Standard resistance NOTICE: Even slightly touching the sensor may change the resistance value. Be sure ...

Removal
1. REMOVE ENGINE ASSEMBLY WITH TRANSAXLE HINT: (See page EM-34) 2. REMOVE TRANSVERSE ENGINE ENGINE MOUNTING INSULATOR (a) Remove the 3 nuts and transverse engine engine mounting insulator. 3. REMOVE FRONT SUSPENSION ARM SUBASSEMBLY LOWER NO.1 LH (a) Remove the 2 bolts on the front sid ...