Mitsubishi Evolution X. Manual - part 92

SYSTEM OPERATION

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-17

KEYLESS ENTRY TIMER LOCK TIME

When none of the doors are opened within 30 sec-
onds after the doors are unlocked by the keyless 
entry system, ETACS-ECU automatically outputs the 
door lock signal to lock the doors. This function pre-
vents the doors from being unlocked unexpectedly 
by operation errors. Using a customization function, 
the timer lock period can be changed (Refer to 

P.42B-28

).

.

OPERATION INHIBITION CONDITIONS

The operation of the system is inhibited when:

• The emergency key is in the ignition switch.

• Any door is open (door switch is ON). (including 

door ajar)

THEFT-ALARM SYSTEM

Refer to GROUP 54A, Theft-alarm system 

P.54A-44

. 

PANIC ALARM SYSTEM

Refer to GROUP 54A, Panic alarm system 

P.54A-46

. 

ENGINE STARTING FUNCTION (IMMOBILIZER FUNCTION)

M2421009200225

When carrying the keyless operation key, a driver 
can start/stop the engine by operating only the IG 
knob. The immobilizer function prevents the engine 
from starting, and immobilizes the vehicle by prohib-
iting the engine fuel injection ignition if a method 
other than the keyless operation key registered for 
that vehicle is used in an attempt to start the engine 
after forced entry.

CONSTRUCTION DIAGRAM

AC709104

AC608095

AB

KOS-ECU

CPU

ECM

CPU

Ignition

Injector

Keyless operation key

Interior
transmitter
antenna
assembly
(Front)

Keyless
operation key 
(Rear view)

Emergency key

ETACS-ECU

CAN-C
communication

CAN-B
communication

Radio 
frequency
signal

Interior
transmitter
antenna
assembly
(Rear)

Receiver
antenna module

IG knob

Steering lock
(Built in
Steering lock unit)

Push switch
(Built in
Steering lock unit)

IG knob cap

OK status signal

IG knob
unlock signal

Radio 
frequency
signal

Keyless 
operation
key ID data

Starter relay

SYSTEM OPERATION

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-18

OPERATION

.

WHEN THE USER IS CARRYING THE 
KEYLESS OPERATION KEY

1. Press the IG knob on the steering lock, and the 

push switch inside the steering lock is turned ON.

2. When the push switch inside the steering lock is 

turned ON, KOS-ECU activates the interior trans-
mitter antenna assembly to send the transmitter 
signal to the keyless operation key.

3. On receiving the transmitter signal from 

KOS-ECU, the keyless operation key performs 
the keyless operation key certification and the 
key ID calculation, and sends the keyless opera-
tion key ID data to KOS-ECU. (The keyless oper-
ation key cannot receive the transmitter signal 
from KOS-ECU when it is not located within the 
engine starting function valid area .)

4. The receiver antenna receives the signal from the 

keyless operation key, and then KOS-ECU com-
pares the keyless operation key ID data sent from 
the key with the one registered in it.

5. When this data coincides, KOS-ECU sends the 

IG knob unlock signal to the steering lock unit 
inside the steering lock.

6. On receiving the IG knob unlock signal, the steer-

ing lock unit performs processing (verification of 
the KOS ID, etc.) based on the received data. 
When no problem is found during the processing, 
the unit sends the OK status signal to KOS-ECU, 
and at the same time, electrically disengages the 
steering lock mechanism to make the IG knob 
rotatable. 

7. When a keyless operation key certification agree-

ment memory "exists" 

*1

 in KOS-ECU when it 

received the OK status signal from the steering 
lock unit, the engine start permission communica-
tion (CAN communication) is performed between 
KOS-ECU and the ECM by turning the IG knob 
from the "ACC" position to the "ON"/"START" 
position, and the engine starts. If the keyless 
operation key certification agreement memory 
"does not exist" 

*2

, the engine does not start.

NOTE: 

.

•

*1

: The keyless operation key certification 

agreement memory "exists" means that a reg-
istered keyless operation key has been recog-
nized during the keyless operation key 
certification communication.

•

*2

: When the keyless operation key certifica-

tion agreement memory "does not exist," the 
"keyless operation key bringing-out monitor-
ing function" and the "keyless operation key 
replacement monitoring function" (keyless 
operation key monitoring controls) have 
judged that the keyless operation key has 
been carried out of the vehicle with the IG 
knob in the LOCK "(OFF)" position while turn-
ing ON the push switch or in the ACC, ON, or 
START position.

.

KEYLESS OPERATION KEY TAKE OUT 
MONITORING FUNCTION

KOS-ECU monitors whether the keyless operation 
key is brought out of the car by performing a certifica-
tion communication with the keyless operation key 
inside the car when all the doors are closed. If the 
keyless operation key is brought out of the car while 
the IG knob is in the position other than the LOCK 
(OFF) position, KOS-ECU notifies that the key is 
brought out of the car.
When none of the registered keyless operation keys 
(up to four) respond during the communication, 
KOS-ECU determines that the key has been brought 
out of the car, and the keyless operation key certifi-
cation agreement memory "does not exist," and does 
not permit starting of the engine.

NOTE: The monitoring function is inhibited when:

.

•

The keyless operation key certification agree-
ment memory "does not exist" from the start.

•

The emergency key is in the IG knob.

•

The IG knob is in LOCK "(OFF)" position and the 
push switch is OFF.

•

The vehicle is judged running (shift lever is in the 
position other than "P" or "N" <TC-SST>, or vehi-
cle speed is 6 km/h or higher).

.

SYSTEM OPERATION

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-19

KEYLESS OPERATION KEY 
REPLACEMENT MONITORING 
FUNCTION

If the keyless operation key carrying-out monitoring 
function once detects that the key has been carried 
out of the vehicle with the IG knob in the LOCK 
"(OFF)" position and with the push switch in other 
than OFF, and then the key is brought into the vehi-
cle, the engine must be started when the IG knob is 
turned to the ON or START position. For this pur-
pose, KOS-ECU performs the certification communi-
cation with the keyless operation key inside the 
vehicle every 5 seconds to monitor the replacement 
of the keyless operation key. When any of the regis-
tered keyless operation keys sends a response, 
KOS-ECU determines that the key has been brought 
into the vehicle (replaced), and sets the keyless 
operation key certification agreement memory to 
"exist," and permits starting of the engine.

NOTE: The monitoring function is inhibited when:

.

•

The keyless operation key certification agree-
ment memory "exists" from the start.

•

The emergency key is in the IG knob.

•

The IG knob is in LOCK (OFF) position and the 
push switch is OFF.

•

The vehicle is judged running (shift lever is in the 
position other than "P" or "N" <TC-SST>, or vehi-
cle speed is 6 km/h or higher).

ENGINE STARTING FUNCTION VALID 
AREA

The engine can be started only when the keyless 
operation key is within the interior antenna receiving 
area.

Emergency function

The emergency function is adopted, which starts the 
engine by a combination of emergency key and key-
less operation key when the IG knob operation is 
unavailable in case such as discharged battery. Also, 
the engine can be started using the conventional 
ignition key (transponder).

AC709160 AB

Interior transmitter antenna assembly (Front)

Antenna receiving area

Interior transmitter antenna assembly (Rear)

SYSTEM OPERATION

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-20

CONSTRUCTION DIAGRAM

OPERATION

.

1. Remove the IG knob cap, and insert the emer-

gency key into the keyless operation key in the 
inverted direction, then insert it into the KOS 
steering lock. Because the transponder (small 
transmitter) integrated in the keyless operation 
key only emits weak radio frequency signals, 
operate the emergency key with the keyless 
operation key inserted in the inverted direction. 
Using the keyless operation key, push in the 
emergency key, and then turn the key.

2. When the emergency key is turned to the ON 

position, the transponder integrated in the key-
less operation key transmits an ID code unique to 
each key (key ID) to the receiver antenna module 
by radio.

3. KOS-ECU compares the sent key ID with the 

already-registered ID code, and only when they 
match, KOS-ECU permits the starting of engine. 
(More than one trillion of ID code combinations 
can be registered. This feature prevents code 
copying, resulting in higher security of the sys-
tem.)

NOTE: 

.

•

The transponder integrated in the keyless opera-
tion key uses the power supplied from the 
receiver antenna module. Therefore, it can be 
used even when the battery in keyless operation 
key is discharged.

•

One keyless operation key is provided, and up to 
four keys can be registered to one vehicle as 
needed. Also for the number of emergency keys, 
the same number of keys as that of keyless oper-
ation keys can be registered to one vehicle.

•

When KOS-ECU is replaced or when the keyless 
operation key is lost or added, the ID codes for all 
the keyless operation keys must be registered 
again using the scan tool.

AC707540

Emergency key

ECM

CPU

CAN

Ignition

Injection

CAN-B

CAN-C

ETACS-ECU

Receiver
antenna
module

KOS-ECU

CAN

CPU

AC

Steering lock

Transponder

Key ID

Keyless operation key

Starter relay

AC609293

Emergency key

AB

IG knob

Receiver antenna 
module

Keyless operation key