Key System
Resume:
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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