Mitsubishi Evolution X. Manual - part 582

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-235

TECHNICAL DESCRIPTION (COMMENT)

The receiver antenna module assembly lock and
unlock signals from the keyless operation key, and
sends them to KOS-ECU, and further to
ETACS-ECU. Also, when ETACS receives signals
from the key reminder switch and all the door
switches, ETACS-ECU judges them to activate the
keyless entry system.

TROUBLESHOOTING HINTS

• Malfunction of CAN bus line

• Malfunction of the door switches

• Malfunction of the key reminder switch

• Malfunction of the receiver antenna assembly

• Malfunction of the keyless operation key

• Damaged wiring harness and connectors

• Malfunction of the KOS-ECU

• Malfunction of ETACS-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

AC708955AM

Connector: D-14

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-236

STEP 1. Using scan tool MB991958, read CAN bus 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) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,

Diagnosis

P.54C-14

AC608435

Data link connector

MB991827

MB991824

MB991910

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-237

STEP 2. Using scan tool MB991958, read the diagnostic
trouble code.

CAUTION

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 3.

AC608435

Data link connector

MB991827

MB991824

MB991910

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-238

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

CAUTION

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

P.42C-6

(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Check the ETACS data list.

• Close the driver's door.

• Close the passenger's door.

• Close the RH-side rear door.

• Close the LH-side rear door.

• Remove the ignition key from the ignition key cylinder.

OK: Normal condition are displayed.

Q: Are the check result normal?

YES <Normal conditions are displayed for all the
items.> : Go to Step 4.
NO <Normal condition is not displayed for item No.
256.> : Refer to GROUP 54A, Inspection Procedure 5:

ETACS-ECU does not receive any signal from the
front door switch (LH)

P.54A-656

NO <Normal condition is not displayed for item No.
257.> : Refer to GROUP 54A, Inspection Procedure 6:

ETACS-ECU does not receive any signal from the
front door switch (RH)

P.54A-654

NO <Normal condition is not displayed for item No.
258.> : Refer to GROUP 54A, Inspection Procedure 8:

ETACS-ECU does not receive any signal from the
rear door switch (RH)

P.54A-661

NO <Normal condition is not displayed for item No.
259.> : Refer to GROUP 54A, Inspection Procedure 7:

ETACS-ECU does not receive any signal from the
rear door switch (LH)

P.54A-658

NO <Normal condition is not displayed for item No.
260.> : Refer to GROUP 54A, Inspection Procedure 9: