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DTC B2799 Engine Immobilizer System Malfunction: Circuit Description

This document provides diagnostics and troubleshooting steps for DTC B2799 "ENGINE IMMOBILIZER SYSTEM MALFUNCTION" in a Toyota Highlander. This DTC indicates errors in communication between the transponder key ECU and ECM or their communication lines. The troubleshooting procedure involves first checking the wire harness and connections between the key ECU and ECM for issues, then testing the operation of the transponder key amplifier. Replacing defective parts as needed should resolve the communication malfunction.

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Obd King Tgi
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1K views2 pages

DTC B2799 Engine Immobilizer System Malfunction: Circuit Description

This document provides diagnostics and troubleshooting steps for DTC B2799 "ENGINE IMMOBILIZER SYSTEM MALFUNCTION" in a Toyota Highlander. This DTC indicates errors in communication between the transponder key ECU and ECM or their communication lines. The troubleshooting procedure involves first checking the wire harness and connections between the key ECU and ECM for issues, then testing the operation of the transponder key amplifier. Replacing defective parts as needed should resolve the communication malfunction.

Uploaded by

Obd King Tgi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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05-2010

DIAGNOSTICS - ENGINE IMMOBILIZER SYSTEM 052IM-12

DTC B2799 ENGINE IMMOBILIZER SYSTEM


MALFUNCTION

CIRCUIT DESCRIPTION
This DTC is output when the ECM detects errors in communication between the transponder key ECU assy
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 assy and the ECM is different.
Before troubleshooting for this DTC, make sure that there is no DTC detected in the transponder key ECU.
If there is a key code-related DTC detected in the transponder key ECU assy, repair it first.
DTC No. DTC Detection Condition Trouble Area
 Error in communication between ECM and transponder  Wire harness
key ECU assy, and in communication line  Transponder key ECU assy
B2799
 Communication ID is different during communication with  Transponder key amplifier
transponder key ECU  ECM

WIRING DIAGRAM

T14
Transponder Key ECU Assy
E6
ECM

27 B 6
IMI EFIO

26 V 7
IMO EFII

B66227

2005 HIGHLANDER REPAIR MANUAL (RM1144U)

Author: Date: 2200


05-201 1
DIAGNOSTICS - ENGINE IMMOBILIZER SYSTEM

INSPECTION PROCEDURE
1 CHECK WIRE HARNESS (TRANSPONDER KEY ECU ASSY - ECM)
(TRANSPONDER KEY ECU ASSY OR ECM - BODY GROUND)

(a) Disconnect the T14 ECU and E6 ECM connectors.


Wire Harness Side
(b) Measure the resistance between the wire harness side
T14 connectors.
Transponder Key ECU Assy Standard:
Symbols (Terminal No.) Specified Condition
EFIO (T14-6) - IMI (E6-27) Below 1 Ω
EFII (T14-7) - IMO (E6-26) Below 1 Ω

(c) Measure the resistance between the T14 or E6 wire har-


ness side connector and the body ground.
Standard:
Symbols (Terminal No.) Specified Condition
E6
EFIO (T14-6) or IMI (E6-27) -
ECM 10 kΩ or higher
Body ground
EFII (T14-7) or IMO (E6-26) -
10 kΩ or higher
Body ground

Y B66220 B66229

OK REPAIR OR REPLACE HARNESS AND


CONNECTOR

NG

2 CHECK OPERATION OF TRANSPONDER KEY AMPLIFIER

(a) After replacing the transponder key amplifier with a normally functioning amplifier, check that the en-
gine starts.
NG REPLACE TRANSPONDER KEY ECU ASSY

OK

NORMAL (TRANSPONDER KEY AMPLIFIER DEFECTIVE)

2005 HIGHLANDER REPAIR MANUAL (RM1144U)

Author: Date: 2201

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