Mitsubishi Evolution X. Manual — part 567
DIAGNOSIS
TSB Revision
KEYLESS OPERATION SYSTEM (KOS)
42B-175
.
TECHNICAL DESCRIPTION (COMMENT)
If only some keyless operation keys cannot be regis-
tered, the keyless operation key itself may be faulty.
If no keyless operation key can be registered, the
key assembly may have already been registered for
another vehicle, or the KOS-ECU may be faulty.
.
TROUBLESHOOTING HINTS
• Malfunction of the keyless operation key
• Damaged wiring harness and connectors
• Malfunction of KOS-ECU
• Ignition key registered for other vehicle
DIAGNOSIS
Required Special Tools:
• MB991958 Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A (Vehicles with
CAN communication system)
STEP 1. Check the keyless operation key inserted in the
key cylinder for interference.
Q: Are there other keyless operation keys or anything that
interferes with the communication (things that generate
radio waves such as magnets and an air-cleaning
device that has a power plug) near the keyless
operation key inserted in the key cylinder?
YES : Move away or remove other keyless operation keys
or things that interfere with the communication (things
that generate radio waves such as magnets and a
air-cleaning device that has a power plug) near the
keyless operation key. Then, go to step 2.
NO : Go to Step 3.
STEP 2. Retest the system
Check that the keyless operation key can be registered.
Q: Is the keyless operation key that cannot be registered
using scan tool?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Check which keyless operation key cannot be
registered.
Q: Can any one of the keyless operation keys be
registered?
YES (Only some keys) : Replace the key that cannot be
registered and register the ID codes (Refer to
). After registering the ID codes, go to Step
5 .
NO (All keys) : Go to Step 4.
AC708955AM
Connector: D-14
DIAGNOSIS
TSB Revision
KEYLESS OPERATION SYSTEM (KOS)
42B-176
STEP 4. Retest the system
Check the scan tool screen when the key was not able to be
registered.
Q: Is the error message of scan tool screen "Abnormality
in key" ?
YES (Abnormality in key) : Carry out DTC B1A25: Key ID
unmatched and DTC B1A35: Transponder read error
(Refer to
<B1A35>).
Then, go to Step 6.
NO (ECU internal error) : Replace KOS-ECU and register
the ID codes (Refer to
STEP 5. Retest the system
Check that the keyless operation key can be registered.
Q: Is the keyless operation key that cannot be registered
using scan tool?
YES : Replace KOS-ECU and register the ID codes (Refer
to
NO : The procedure is complete.
STEP 6. Retest the system
Check that the keyless operation key can be registered.
Q: Is the keyless operation key that cannot be registered
using scan tool?
YES : Go to Step 7.
NO : The procedure is complete.
STEP 7. Check receiver antenna module connector C-08,
receiver antenna assembly connector D-14, KOS-ECU
connector C-05, joint connector (6) C-16 and intermittent
connector C-41 for loose, corroded or damaged terminals,
or terminals pushed back in the connector.
Q: Is the receiver antenna module connector C-08, receiver
antenna assembly connector D-14, KOS-ECU connector
C-05, joint connector (6) C-16 and intermittent
connector C-41 in good condition?
YES : Go to Step 8.
NO : Repair the defective connector.
DIAGNOSIS
TSB Revision
KEYLESS OPERATION SYSTEM (KOS)
42B-177
STEP 8. Check the wiring harness between the receiver
antenna assembly connector D-14 (terminal Nos.1, 8, 12, 3,
5) and the KOS-ECU connector C-05 (terminal Nos.12, 32,
7, 9, 13) for open circuit.
(1) Disconnect reciever anntena assembly connector D-14 and
KOS-ECU connector C-05, and check the wiring harness.
(2) Check the wiring harness between reciever anntena
assembly connector D-14 (terminal No.1) and KOS-ECU
connector C-05 (terminal No.12)
OK: Continuity exists (2
Ω or less)
(3) Check the wiring harness between reciever anntena
assembly connector D-14 (terminal No.8) and KOS-ECU
connector C-05 (terminal No.32)
OK: Continuity exists (2
Ω or less)
(4) Check the wiring harness between reciever anntena
assembly connector D-14 (terminal No.12) and KOS-ECU
connector C-05 (terminal No.7)
OK: Continuity exists (2
Ω or less)
(5) Check the wiring harness between reciever anntena
assembly connector D-14 (terminal No.3) and KOS-ECU
connector C-05 (terminal No.9)
OK: Continuity exists (2
Ω or less)
AC709707
AC709707
Harness side: C-05
DK
Harness side: D-14
AC709707
Harness side: C-05
DL
Harness side: D-14
AC709707DM
Harness side: D-14
Harness side: C-05
AC709707DN
Harness side: C-05
Harness side: D-14
DIAGNOSIS
TSB Revision
KEYLESS OPERATION SYSTEM (KOS)
42B-178
(6) Check the wiring harness between reciever anntena
assembly connector D-14 (terminal No.5) and KOS-ECU
connector C-05 (terminal No.13)
OK: Continuity exists (2
Ω or less)
Q: Is the wiring harness between receiver antenna
assembly connector D-14 (terminal Nos.1, 8, 12, 3, 5)
and the KOS-ECU connector C-05 (terminal Nos.12, 32,
7, 9, 13) in good condition?
YES : Go to Step 9.
NO (receiver antenna assembly connector D-14 terminal
No.1
− KOS-ECU connector C-05 terminal No.12.) :
Repair the wiring harness between receiver antenna
assembly connector D-14 (terminal No.1) and the
KOS-ECU connector C-05 (terminal No.12).
NO (receiver antenna assembly connector D-14 terminal
No.8
− KOS-ECU connector C-05 terminal No.32.) :
Repair the wiring harness between receiver antenna
assembly connector D-14 (terminal No.8) and the
KOS-ECU connector C-05 (terminal No.32).
NO (receiver antenna assembly connector D-14 terminal
No.12
− KOS-ECU connector C-05 terminal No.7.) :
Repair the wiring harness between receiver antenna
assembly connector D-14 (terminal No.12) and the
KOS-ECU connector C-05 (terminal No.7).
NO (receiver antenna assembly connector D-14 terminal
No.3
− KOS-ECU connector C-05 terminal No.9.) : Repair
the wiring harness between receiver antenna
assembly connector D-14 (terminal No.3) and the
KOS-ECU connector C-05 (terminal No.9).
NO (receiver antenna assembly connector D-14 terminal
No.5
− KOS-ECU connector C-05 terminal No.13.) :
Repair the wiring harness between receiver antenna
assembly connector D-14 (terminal No.5) and the
KOS-ECU connector C-05 (terminal No.13).
AC709707DO
Harness side: C-05
Harness side: D-14
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