Mitsubishi Evolution X. Manual — part 586

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-251

STEP 3. Using scan tool MB991958, check pulse check.
Check the signals related to the keyless entry system opera-
tion.

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 the

Scan Tool (M.U.T.-III)

P.42B-10

."

(2) Confirm the ETACS pulse check.

• Remove the ignition key from the ignition key cylinder.

OK: The scan tool (M.U.T.-III) tone alarm sounds.

Q: Is the check result normal?

YES : Go to Step 4.
NO : Refer to "Signals from transmitter switches are not

received

P.42B-260

."

STEP 4. Check trunk lid latch connector F-19 and
ETACS-ECU connector C-311 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
Q: Is trunk lid latch connector F-19 and ETACS-ECU

connector C-311 in good condition?
YES : Go to Step 5.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

.

Item name

Conditions

Transmitter switch

Turn the switch ON/OFF.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-252

STEP 5. Check the trunk lid latch assembly.
Remove the trunk lid latch assembly. Refer to GROUP 42A,
Trunk lid removal and installation

P.42A-147

.

Q: Is the trunk lid actuator normal?

YES : Go to Step 6.
NO : Replace the trunk lid latch assembly.

STEP 6. Check the ground circuit to the trunk lid lock
actuator. Measure the resistance at trunk lid lock actuator
connector F-19.
(1) Disconnect trunk lid lock actuator connector F-19 and

measure the resistance available at the wiring harness side
of the connector.

(2) Measure the resistance value between terminal 2 and

ground.

• The resistance should be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 9.
NO : Go to Step 7.

Lever position

Battery
connection

Lever operation

At the "OFF"
position

• Connect

terminal No.2
and the
negative
battery
terminal.

• Connect

terminal No.3
and the
positive battery
terminal.

The lever moves
from the "OFF"
position to the
"OPEN" position.

AC609215

AB

Off

Lever

Open

AC209731

Connector F-19
(harness side)

AC208731CD

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-253

STEP 7. Check the wiring harness between the trunk lid
latch connector F-19 (terminal No. 2) and the ground for
open circuit.
(1) Disconnect trunk lid latch connector F-19 and ground, and

check the wiring harness.

(2) Check the wiring harness between trunk lid latch connector

F-19 (terminal No. 2) and ground.

OK: Continuity exists (2

Ω or less)

Q: Is the wiring harness between trunk lid latch connector

F-19 (terminal No. 2) and ground in good condition?
YES : Go to Step 8.
NO (trunk lid latch connector F-19 terminal No. 2

−

ground.) : Repair the wiring harness between trunk lid latch

connector F-19 (terminal No. 2) and ground.

STEP 8. Check the wiring harness between the trunk lid
latch connector F-19 (terminal No. 2) and the ground for
short circuit.
(1) Disconnect unlock sensor (front door: RH) connector E-05,

and check the wiring harness.

(2) Check the wiring harness between trunk lid latch connector

F-19 (terminal No. 2) and ground

OK: No continuity

Q: Is the wiring harness between trunk lid latch connector

F-19 (terminal No. 2) and the ground in good condition?
YES : Go to Step 11.
NO (trunk lid latch connector F-19 terminal No. 2

−

ground.) : Repair the wiring harness between trunk lid latch

connector F-19 (terminal No. 2) and ground.

STEP 9. Check the wiring harness between the trunk lid
latch connector F-19 (terminal No. 3) and the ETACS-ECU
connector C-311 (terminal No. 1) for open circuit.
(1) Disconnect trunk lid latch connector F-19 and ETACS-ECU

connector C-311, and check the wiring harness.

(2) Check the wiring harness between trunk lid latch connector

F-19 (terminal No. 3) and ETACS-ECU connector C-311
(terminal No. 1).

OK: Continuity exists (2

Ω or less)

Q: Is the wiring harness between trunk lid latch connector

F-19 (terminal No. 3) and ETACS-ECU connector C-311
(terminal No. 1) in good condition?
YES : Go to Step 10.
NO (trunk lid latch connector F-19 terminal No. 3

−

ETACS-ECU connector C-311 terminal No. 1.) : Repair

the wiring harness between trunk lid latch connector
F-19 (terminal No. 3) and ETACS-ECU connector
C-311 (terminal No. 1).

AC209731

Connector F-19
(harness side)

AC208731CD

AC209731

Connector F-19
(harness side)

AC208731CD

AC709707HP

Harness side: F-19

Harness side: C-311

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-254

STEP 10. Check the wiring harness between the trunk lid
latch connector F-19 (terminal No. 3) and the ground for
short circuit.
(1) Disconnect trunk lid latch connector F-19, and check the

wiring harness.

(2) Check the wiring harness between trunk lid latch connector

F-19 (terminal No. 3) and ground

OK: No continuity

Q: Is the wiring harness between trunk lid latch connector

F-19 (terminal No. 3) and the ground in good condition?
YES : Go to Step 11.
NO (trunk lid latch connector F-19 terminal No. 3

−

ground.) : Repair the wiring harness between trunk lid latch

connector F-19 (terminal No. 3) and ground.

STEP 11. Check of the troubles
Operate the transmitter and check that the trunk lid can be
opened.
Q: Is the check result normal?

YES : The diagnosis is complete.
NO : Replace the ETACS-ECU. When the ETACS-ECU is

replaced, register the keyless ID. Refer to

P.42C-114

.

The trunk lid can be opened by means of the
transmitter.

AC209731

Connector F-19
(harness side)

AC208731CK