Mitsubishi Evolution X. Manual — part 588

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-259

STEP 6. Check the wiring harness between the outer tone
alarm connector F-21 (terminal Nos. 1, 2) and the ground
for short circuit.
(1) Disconnect outer tone alarm connector F-21, and check the

wiring harness.

(2) Check the wiring harness between outer tone alarm

connector F-21 (terminal No. 1) and ground

OK: No continuity

(3) Check the wiring harness between outer tone alarm

connector F-21 (terminal No. 2) and ground

OK: No continuity

Q: Is the wiring harness between outer tone alarm

connector F-21 (terminal Nos. 1, 2) and the ground in
good condition?
YES : Go to Step 7.
NO [outer tone alarm connector F-21 terminal No.1

−

ground.] : Repair the wiring harness between outer tone

alarm connector F-21 (terminal No.1) and ground.

NO [outer tone alarm connector F-21 terminal No.2

−

ground.] : Repair the wiring harness between outer tone

alarm connector F-21 (terminal No.2) and the ground.

STEP 7. Check of the troubles
Check that the outer tone alarm sounds when the outer tone
alarm sounding conditions are met.
Q: Is the check result normal?

YES : The diagnosis is complete.
NO : Replace KOS-ECU and register the ID codes (Refer

to

P.42B-12

).

INPUT SIGNAL REFERENCE TABLE

M1429614800011

AC709707IX

Harness side: F-21

AC709707IY

Harness side: F-21

Trouble symptom

Reference page

Signals from transmitter switches are not received.

P.42B-260

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-260

INPUT SIGNAL PROCEDURES

Signals from transmitter switches are not received.

CAUTION

Before replacing the ECU, ensure that the power
supply circuit, the ground circuit and the com-
munication circuit are normal.

.

TECHNICAL DESCRIPTION (COMMENT)

Input signal from the keyless entry transmitter is
used to operate the keyless entry system. If the sig-
nal is abnormal, the keyless entry system will not
work normally.

.

TROUBLESHOOTING HINTS

• Battery discharged in the transmitter

• Malfunction of the transmitter

• Malfunction of KOS-ECU

DIAGNOSIS

Required Special Tools:

• MB992006: Extra fine probe

• MB991223: Harness set

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicles Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, read the diagnostic
trouble code.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect

scan tool (M.U.T.-III)

P.42B-10

."

(2) Turn the ignition switch to the "ON" position.
(3) Check whether the KOS-ECU related DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the KOS-ECU. Refer to

P.42B-20

.

NO : Go to Step 2.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-261

STEP 2. Check the transmitter battery.
Measure the voltage of the transmitter battery.

• The value should be approximately 2.5 - 3.2 volts.

Q: Is the measured voltage approximately 2.5 - 3.2 volts?

YES : Go to Step 3.
NO : Replace the battery. If the transmitter can be

registered normally, and operates normally, it
indicates that the transmitter is sending normal signal
to the KOS-ECU.

STEP 3. Register the keyless entry secret code using a
known-normal transmitter of the same type again, and
check the trouble symptom.
(1) Register a known-normal transmitter of the same type.
(2) Check if the signals from the transmitter switches are

received.

Q: Can the transmitter be registered correctly?

YES : Replace the original transmitter with a new one.
NO : Replace the KOS-ECU (Including when the new

transmitter cannot be registered). Replace KOS-ECU
and register the ID codes (Refer to

P.42B-265

). If the

transmitter works normally, the input signal from the
transmitter should be normal.

AC004486

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-262

TERMINAL VOLTAGE REFERENCE CHART

M1429606800232

KOS-ECU TERMINAL CHECK

AC507348

C-05

AJ

Terminal
number

Check item

Check condition

Normal condition

1

CAN H

−

−

2

CAN L

−

−

3

−

−

−

4

Steering lock unit signal output

When the ignition switch is
operated

0 to 5 V (pulse signal)

5

Steering lock unit power supply

When the ignition switch is
operated

5 V

6

Interior transmitter antenna
assembly (front) ground

Always

0 V

Interior transmitter antenna
assembly (rear) ground
Exterior transmitter antenna
assembly (driver's side) ground
Exterior transmitter antenna
assembly (front passenger's side)
ground
Exterior transmitter antenna
assembly (trunk lid) ground

7

Receiver antenna module power
supply

Always

5 V

Receiver antenna assembly power
supply

8

Push switch inside the steering lock Push switch inside the steering

lock: ON

7 to 8 V

9

Receiver antenna assembly DATA
output

Keyless operation key lock button,
unlock button, and trunk lid button:
ON

0 to 5 V (pulse signal)

Receiver antenna module signal
output

−

10

Receiver antenna module RSSI
output

−

−

11

Receiver antenna module signal
output

When communicating with the
keyless operation key with the
emergency key inserted in the
inverted direction (ignition switch:
ON)

0 to 5 V (pulse signal)