Mitsubishi Evolution X. Manual — part 93

SYSTEM OPERATION

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-21

TIRE PRESSURE MONITORING SYSTEM (TPMS) FUNCTION

M2421000600022

When the tire pressure becomes under the specified
value, the TPMS function warns the driver of that
state by illuminating the TPMS warning light.

OPERATION

• The signals from the TPMS transmitter are

received by the receiver antenna assembly and
sent to KOS-ECU.

• KOS-ECU processes input signals from each

TPMS transmitter as well as vehicle speed sig-
nals from the ABS-ECU. It receives the atmo-
spheric pressure signal from ECM, and when the
atmospheric pressure is low (such as at high alti-
tude), it calibrates the tire pressure received from
TPMS transmitter and makes a judgment of
warning. When the road tire pressure is low, it
sends a warning signal causing the TPMS warn-
ing light to be illuminated. When the TPMS has
problems, it sends a warning signal causing the
TPMS warning light to be flashed

*

.

NOTE:

*

: Change to continuous illumination after

flashing for about 1 minute.

• For 3 seconds after the ignition switch is turned to

the "ON" position, KOS-ECU illuminates the
TPMS warning light to check any breaks in the
TPMS warning light circuit.

• By connecting the scan tool to the data link con-

nector, data stored in KOS-ECU (data of tire
pressure and TPMS transmitter ID, the alarm sta-
tus and warning history, etc.) can be displayed
and TPMS transmitter ID can be registered.
NOTE: If the TPMS transmitter is replaced, regis-
ter the ID codes of all the TPMS transmitters
again using the scan tool.

TPMS WARNING LIGHT

The TPMS warning light on the combination meter illuminates
or flashes

*

to alert the driver by request from KOS-ECU. When

the tire pressure warning or the fault warning is activated, a
warning symbol and a message are displayed on the multi
information display.
WARNING DISPLAY PATTERN OF TPMS WARNING LIGHT
AND MULTI INFORMATION DISPLAY

NOTE:

*

:Change to continuous illumination after flashing about

1 minute.

Circumstance

Warning light Multi

information
display

For 3 seconds
after the ignition
switch is turned to
the "ON" position
(warning light
circuit self-check)

Illuminates

No indication

TPMS problems

Flashes

*

Symbol and
"SERVICE
REQUIRED" is
displayed

Low tire pressure Illuminates

Symbol and
"LOW TIRE
PRESSURE"
is displayed

LOW
TIRE PRESSURE

SERVICE
REQUIRED

AC609362

SYSTEM OPERATION

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-22

TIRE PRESSURE THRESHOLD VALUES

TPMS TRANSMITTER (TIRE PRESSURE SENSOR)

The TPMS transmitter combines the valve and tire
pressure sensor in a single unit. The TPMS transmit-
ters are mounted inside the tires. The TPMS trans-
mitter measures tire pressure directly with its tire
pressure sensor and sends radio frequency signals
to KOS-ECU via receiver antenna assembly. The
TPMS transmitter includes acceleration sensor that
senses tire rotation, and change tire pressure sam-
pling and data transmission timing when vehicle is
running.
NOTE: Use only genuine wheels. The use of
non-genuine wheels may cause the improper instal-
lation of the TPMS transmitters, possibly resulting in
air leakage and damage to the TPMS transmitter.

.

TIRE PRESSURE SAMPLING TIMING

NOTE: Vehicle moving = vehicle speed: approxi-
mately 25 km/h (15 mph) or more

.

DATA TRANSMISSION TIMING

If a sampled pressure varies by

±10 kPa

(1.5psi) from the last transmitted pressure
value, an additional transmission will occur.

NOTE:

*

: Once every 15 seconds for first 30 trans-

mission after vehicle starts moving.

Item

Tire pressure kPa (psi)

Standard pressure at
cold (reference)

220 (32)

Alarm ON pressure

174 (25.2) or less

Alarm OFF pressure

189 (27.4) or more

Vehicle status

Sampling timing

At vehicle moving

once every 5 seconds

At vehicle stationary

once every 1 minute

Vehicle status

Transmission timing

At vehicle moving

once every 1 minute

*

At vehicle stationary

once every 13 hours

SYSTEM OPERATION

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-23

WARNINGS/ALARMS

M2421009300181

If the KOS failed, operated improperly, KOS-ECU
warns the driver of this by setting off the outer tone
alarm and the keyless operation warning indicator,
on the multi information display in the combination
meter. If the TPMS fails or the tire pressure is low,
KOS-ECU warns the driver of that state by the TPMS
warning light and the multi information display in the
combination meter.

Display
contents

Item

State

Warning operations

Warning

cancellation

conditions

(Cancels warning

operations when

one of the

conditions met)

TPMS
warning
light

Multi
information
display

Low keyless
operation key battery
voltage warning

The keyless
operation key
with low battery
voltage is
detected when
the IG knob is
pressed.

−

• Warning

indicator
flashes for
30 seconds.

• The outer

tone alarm
will not
sound.

• IG knob in

"LOCK" (OFF)
position and
push switch OFF
are detected.

• 30 seconds have

passed after the
warning output
started.

No keyless operation
key detected inside
the car

No keyless
operation key is
detected inside
the car when the
IG knob is
pressed.

−

• The warning

indicator
flashes for 5
minutes.

• The outer

tone alarm
will not
sound.

• IG knob in

"LOCK" (OFF)
position and
push switch OFF
are detected.

• 5 minutes have

passed after the
warning output
started.

IG knob is not
returned properly.

Opening of the
driver's door is
detected when
the IG knob is in
ACC or LOCK
position and the
push switch is
ON.

−

• The warning

indicator
flashes for 5
minutes.

• The outer

tone alarm
will not
sound.

• Key

reminder
warning tone
alarm
sounds until
closing of the
driver's door
is detected.

• The IG knob in

the "RUN" or
"START"
position, or the
IG knob in the
"LOCK" (OFF)
position, and the
push switch OFF
are detected.

• The driver's door

is detected
closed from the
open position.

• 5 minutes have

passed after the
warning output
started.

AC610126

KEY BATTERY
LOW

AB

AC610127

KEY MISSING

AB

AC610124AB

STEERING
WHEEL LOCK

SYSTEM OPERATION

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-24

Keyless operation
key brought out of
the car warning

The keyless
operation key is
carried out of
the vehicle
when the IG
knob is in the
position other
than the LOCK
position, and all
the doors are
closed.

−

• The warning

indicator
flashes for 5
minutes.

• Outer tone

alarm
sounds for
5.69
seconds in
pattern 2.

• IG knob in

"LOCK" (OFF)
position and
push switch OFF
are detected.

• KOS-ECU has

detected a
keyless
operation key
inside the
vehicle.

• 5 minutes have

passed after the
warning output
started.

Door lock does not
operate.

Push switch is
pressed ON
when the IG
knob is in other
than LOCK
position.

−

• Warning

indicator
flashes for 5
seconds.

• Outer tone

alarm
sounds for
2.96
seconds in
pattern 1.

• IG knob in

"LOCK" (OFF)
position and
push switch OFF
are detected.

• 5 seconds have

passed after the
warning output
started.

Push switch is
pressed ON
when the
keyless
operation key is
inside the car.

• Lock switch on

the keyless
operation switch
is pressed again.

• 5 seconds have

passed after the
warning output
started.

Push switch is
pressed ON
when the door is
ajar.

• All doors are

closed.

• 5 seconds have

passed after the
warning output
started.

Display
contents

Item

State

Warning operations

Warning

cancellation

conditions

(Cancels warning

operations when

one of the

conditions met)

TPMS
warning
light

Multi
information
display

AC610128

CONFIRM
KEY LOCATION

AC

AC610129

CHECK DOORS

AB