Mitsubishi Evolution X. Manual — part 576

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-211

STEP 4. Check the wiring harness between the KOS-ECU
connector C-05 (terminal No. 21) and lock switch (front
door: LH) connector E-17 (terminal No. 1), and between
lock switch (front door: LH) connector E-17 (terminal No. 2)
and ground for open circuit.
(1) Disconnect KOS-ECU connector C-05 and lock switch

(front door: LH) connector E-17, and check the wiring
harness.

(2) Check the wiring harness between KOS-ECU connector

C-05 (terminal No.21) and lock switch (front door: LH)
connector E-17 (terminal No.1).

OK: Continuity exists (2

Ω or less)

(3) Check the wiring harness between lock switch (front door:

LH) connector E-17 (terminal No.2) and ground.

OK: Continuity exists (2

Ω or less)

Q: Is the wiring harness between KOS-ECU connector C-05

(terminal No. 21) and lock switch (front door: LH)
connector E-17 (terminal No. 1), and between lock
switch (front door: LH) connector E-17 (terminal No. 2)
and ground in good condition?
YES : Go to Step 5.
NO (KOS-ECU connector C-05 terminal No.21

− lock

switch (front door: LH) connector E-17 terminal No.1.) :

Repair the wiring harness between KOS-ECU
connector C-05 (terminal No.21) and lock switch
(front door: LH) connector E-17 (terminal No.1).

NO (lock switch (front door: LH) connector E-17
terminal No.2

− ground.) : Repair the wiring harness

between lock switch (front door: LH) connector E-17
(terminal No.2) and ground.

AC709707 GQ

Harness side: E-17

Harness side: C-05

AC209731

Connector E-17
(harness side)

AC208731CF

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-212

STEP 5. Check the wiring harness between the lock switch
(front door: LH) connector E-17 (terminal Nos. 1, 2) and the
ground for short circuit.
(1) Disconnect lock switch (front door: LH) connector E-17, and

check the wiring harness.

(2) Check the wiring harness between lock switch (front door:

LH) connector E-17 (terminal No. 1) and ground

OK: No continuity

(3) Check the wiring harness between lock switch (front door:

LH) connector E-17 (terminal No. 2) and ground

OK: No continuity

Q: Is the wiring harness between lock switch (front door:

LH) connector E-17 (terminal Nos. 1, 2) and the ground
in good condition?
YES : Go to Step 6.
NO [lock switch (front door: LH) connector E-17
terminal No.1

− ground.] : Repair the wiring harness

between lock switch (front door: LH) connector E-17
(terminal No.1) and ground.

NO [lock switch (front door: LH) connector E-17
terminal No.2

− ground.] : Repair the wiring harness

between lock switch (front door: LH) connector E-17
(terminal No.2) and the ground.

STEP 6. KOS communication test
Using scan tool (M.U.T-III), perform the antenna communica-
tion test to check that the exterior transmitter antenna (driver's
side) communicates normally (Refer to

P.42B-265

).

Q: Is the check result normal?

YES : Go to Step 7.
NO : Perform troubleshooting for the diagnostic trouble

code No. B240A (Refer to

P.42B-72

).

STEP 7. Check of the troubles
Operate the lock switch (front door: LH) and check that the
door can be locked.
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

).

AC209731

AC208731CM

Harness side: E-17

AC209731

AC208731CL

Harness side: E-17

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-213

Inspection Procedure 10: Driver's door unlock sensor does not work.

CAUTION

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

.

TROUBLESHOOTING HINTS

• Malfunction of the exterior transmitter antenna

assembly (driver's side)

• Malfunction of the unlock sensor (front door: LH)

• Damaged wiring harness and connectors

• Malfunction of the KOS-ECU

AC709308

UNLOCK SENSOR
(FRONT DOOR: LH)

JOINT
CONNECTOR
(1)

BLA

CK

BLA

CK

BLA

CK

BLA

CK

YELLO

W

-PINK

WHITE

LIGHT GREEN

LIGHT GREEN

LIGHT GREEN

KOS-ECU

Unlock Sensor (Front Door: LH) Circuit

AB

AC708950BB

C-129 (BR)

C-128

C-101 (B)

C-05

Connectors: C-05, C-101, C-128, C-129

AC608167AP

Connector: E-18

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-214

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.

STEP 2. Check KOS-ECU connector C-05 and unlock
sensor (front door: LH) connector E-18 for loose, corroded
or damaged terminals, or terminals pushed back in the
connector.
Q: Are KOS-ECU connector C-05 and unlock sensor (front

door: LH) connector E-18 in good condition?
YES : Go to Step 3.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. Check that the driver’s door unlock sensor

works normally.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB