B*****

E*

ECM

T**

Transponder Key ECU Assy

IMI

IMO

6

7

EFIO

EFII

27

** *

B

**-****

DIAGNOSTICS - ENGINE IMMOBILIZER SYSTEM

Author : Date : 2200

**** ********** ****** ****** (RM1144U)

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

B2799

Error in communication between ECM and transponder key ECU assy, and in communication line

Communication ID is different during communication with transponder key ECU

Wire harness

Transponder key ECU assy

Transponder key amplifier

ECM

WIRING DIAGRAM

052IM-12

Y B66220 B66229

T14

Transponder Key ECU Assy

E6

ECM

Wire Harness Side

DIAGNOSTICS - ENGINE IMMOBILIZER SYSTEM

05-2011

Author : Date : 2201

2005 HIGHLANDER REPAIR MANUAL (RM1144U)

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.

(b) Measure the resistance between the wire harness side connectors.

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

EFIO (T14-6) or IMI (E6-27) -

Body ground

10 kΩ or higher

EFII (T14-7) or IMO (E6-26) -

Body ground

10 kΩ or higher

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)

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