9W-2 IMMOBILIZER SYSTEM
Notice
lIf vehicle is equipped with immobilizer system and the engine
cranks normally but not start, check immobilizer system first
rather than ignition and other electrical systems because it
can be disabled fuel supply of injectors by ECU due to
defective immobilizer system.
lProgramming of the immobilizer system will be performed
by authorized personnel only. If following defective codes
for immobilizer system appear during diagnosis of vehicle
with SCANNER, ask immobilizer programming to authorized
personnel and actual programming should be performed
by authorized personnel only.
Display of defectives relevant to immobilizer system :
SCANNER
1. No communication with transponder
2. No immobilizer programming
lThe transponder in the key can be damaged by shocks of
dropping or hitting other objectives, so handle it with care.
lEach supplied key has programming of code on its own.
Accordingly if ECU needs to be replaced, replace the
transponder in the key.
lThe vehicle equipped with immobilizer system will never be
started with remote ignition device, so do not attempt to
install it.
lThe immobilizer system will never be removed from the
vehicle. So never attempt to remove it to install a remote
ignition device or others.
lIf engine does not start during service, use every key to
start the engine and then check immobilizer system finally.
FUNCTION DESCRIPTION
Immobilizer is a device disabling vehicle ignition unless a speific key is used and designed to help prevent vehicle
theft.
Immobilizer is comprised of two devices, a key with encoded transponder and engine control unit(ECU) with the same
encoding of the transponder. When a key is inserted into the key hole to start vehicle and turned to ‘ON’, the ECU
reads and decodes the transponder code and, if the same, starts the engine, it is called immobilizer. It means
immobilizer system disables starting by stopping fuel supply if the code in the transponder does not match the code
stored in ECU each other.
Cases that requires immobilizer
programming
1. Replacement ECU
In this case, replace the every transponder
of the key at once.
2. Replacement of the transponder
3. Additional key for lost 1 or 2 keys
1 ) Clear all codes for current keys from the
ECU
2 ) When using current key : clear code of
the transponder and re-program it
3) Additional (purchased) key : perform
programming
4. When lost all keys
1 ) Clear all memorized key codes from the
ECU
2 ) Replace the key and key set
3 ) Immobilizer programming
IMMOBILIZER SYSTEM 9W-9
Check and Remedy when Engine Does not Start
Starter operates normally?
Ye s No
lCheck fuses (No. 8 and 27)
lCheck ECU and antenna power
ECU terminal
- No. 12 (Power)
- No. 11 (Ignition)
- No.5/10 (Ground)
lCheck battery voltage
lCheck battery wiring
lCheck signal wires between ECU
and antenna
- Immobilizer No.3 wire (0.5BY) =
ECU No. 14 pin (0.75BW)
:
Writing immobilizer code number
- Immobilizer No.4 wire (0.5Y) =
ECU No.13 pin (0.75Y)
: Reading immobilizer cod number
lCheck starter wires
lCheck TCU wires (only for 5-
speed automatic transmission)
lCheck starter and TCU
lECU No.2 pin : check normal
signal of the starter 1)
- Engine cranking voltage : 8-15V
lCheck engine speed sensor wires
and replace
lReplace immobilizer antenna
lReplace transponder and ECUNotice
1)
MSE ECU equipped vehicle is designed to
make fuel injection when the engine speed
for initial cranking is over 450rpm if there
are no start switch inputs in ECU No. 2 pin.
If transponder and ECU are replaced,
perform programming.
IMMOBILIZER SYSTEM 9W-11
Check and Remedy when Engine Does not Start
Starter operates normally?
Ye s No
lCheck fuses (No. 19)
lCheck ECU and antenna power
and solenoid valve
ECU terminal
- No. 9 (Ignition)
- No. 6 (Ground)
lCheck battery voltage
lCheck battery wiring
lCheck signal wires between ICU
and antenna
- Immobilizer No.3 wire (0.5Y) =
ICU No. 1 pin (0.75BW)
:
Writing immobilizer code number
- Immobilizer No.4 wire (0.5G) =
ECU No.3 pin (0.75Y)
: Reading immobilizer cod number
lCheck starter wires
lCheck TCU wires (only for 5-
speed automatic transmission)
lCheck starter and TCU
lECU No.2 pin : check normal
signal of the starter 1)
- Engine cranking voltage : 8-15V
lCheck engine speed sensor wires
and replace
lReplace immobilizer antennaNotice
2)
New valve is possible coded either with a
new ICU or an already used ICU. But old
coded valve is only possible coded with a
new ICU.
If transponder and ICU are replaced,
perform programming.
lReplace transponder and ICUlReplace the valve
1. Turn Ign sw ON
2. Turn Ign sw OFF & ON
(To learn the valve correctly it is necessary
to switch on Ignition twice for at least 5
seconds.)2)
