Kia Sorento 2001 General Information Manual page 1217

state. The unlocked state allows engine start. The ICU communicates also with a Power Scan Tool in order to:
• Proceed with key (transponder) matching at the end of vehicle manufacturing line.
• Initialize the engine management system.
• Proceed with auto-test of the product (check of antenna connections and W line output).
In case of a transponder failure, the immobilizer can be unlocked with a procedure called Limp Home Procedure by
entering PIN (i.e. passcode) with the RR DEF SW.
ICU
• Transponder reader/exciter interface
• 5V power supply regulation
• Serial communication interface
• Lamp relay drivers
• Micro controller and software
Transponder reader/exciter
The communication with the transponder is done by an integrated circuit (ASIC) which intergrates in addition to the
transponder reader/exciter:
• 5V voltage regulator for intermal use and micro controller power supply.
• Watch dog circuit
• W line driver used for the communication with the ECM
Electrical characteristics of the ASIC:
• DC operational supply voltage:6V~16V
• 5V voltage regulator output:4.8V~5.2V
Transponder
The transponder used is the read only type in glass tube package. The transponder is inserted in the key by over molding
procedure at the steering column lock factory.
Antenna
The antenna is composed of:
• Coil
• Plastic holder for the coil and envelop
• 1 meter of 1pair of twisted wires cable
• AMP 3 position connector
Functions
Abbreviations
ECU
EMS
ECM
VIM
ICU
MIN
PIN
VIN
Function list
Transponder communication : reads the transponder code and decide (in normal mode) the immobilizer condition
"Locked" or "Unlocked"
ECM communication:answer the requests from engine management system.
Diagnostic communication:answers the requests from diagnostic tool (Hi-Scan Pro Tool).
Limphome function:manages teh ignition and RR DEF SW input and handies the override procedure for the Limphome
and key learning sequence.
Electronic Control Unit or Engine Control Unit
Engine Management System
Engine Control Module (Same as ECU)
Vehicle Immobilizer
Inkey Control Unit
Model Identification Number
personal Identification Number (i.e. Passcode)
Vehicle Identification Number