Mitsubishi Evolution X. Manual — part 574
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-203
Inspection Procedure 8: No door will be locked or unlocked by operating a lock switch on any door,
or by touching the unlock sensor.
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 CAN bus lines
• Malfunction of the central door locking system
• Malfunction of the keyless operation key
• Malfunction of the key reminder switch
• Damaged wiring harness and connectors
• Malfunction of the KOS-ECU
• Function setting error or no setting with a custom-
ization
AC609048
KEY
REMINDER
SWITCH
WHEN
REMOVING
KEY: ON
ETACS-ECU
RED- WHITE
BLA
CK
BLA
CK
BLA
CK
BLA
CK
ETACS-ECU and Key Reminder Switch Circuit
AC
AC708972AU
Connector: C-315
ETACS-ECU
AC708953AC
Connector: C-211
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-204
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 CAN bus
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)
(2) Turn the ignition switch to the "ON" position.
(3) Check whether the CAN bus lines related DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Repair the CAN bus line (Refer to GROUP 54C, CAN
bus diagnostics table
).
NO : Go to Step 2.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-205
STEP 2. 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)
(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
.
NO : Go to Step 3.
STEP 3. Check the central door locking operation
Check that the central door locking system works normally.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Perform troubleshooting for the central door locking
system (Refer to GROUP 42A, Door
−
Troubleshooting
).
STEP 4. Check the customize function.
Check that either of the followings other than "ENG strt enable"
or "Both disabled" are set for "KOS feature" with the customiza-
tion function.
• Both enable
• Door Entry enable
Q: Is the check result normal?
YES : Go to Step 5.
NO : Set either of the followings other than "ENG strt
enable" or "Both disabled" for "KOS feature" with the
customization function (Refer to
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-206
STEP 5. Key reminder switch check
(1) Disconnect the C-315 ETACS-ECU connector.
(2) Measure the resistance at the harness-side connector with
the ignition key removed from the ignition key cylinder.
(3) Check the continuity between the C-315 ETACS-ECU
connector terminal No. 13 and the ground.
OK: Continuity exists (2
Ω or less)
Q: Is the check result normal?
YES : Go to Step 8.
NO : Go to Step 6.
STEP 6. Check the wiring harness between the key
reminder switch connector C-211 (terminal No. 3) and
ETACS-ECU connector C-315 (terminal No. 13) for open
circuit.
(1) Disconnect key reminder switch connector C-211 and
ETACS-ECU connector C-315, and check the wiring
harness.
(2) Check the wiring harness between key reminder switch
connector C-211 (terminal No. 3) and ETACS-ECU
connector C-315 (terminal No. 13).
OK: Continuity exists (2
Ω or less)
Q: Is the wiring harness between key reminder switch
connector C-211 (terminal No. 3) and ETACS-ECU
connector C-315 (terminal No. 13) in good condition?
YES : Go to Step 7.
NO (key reminder switch connector C-211 terminal No.3
− ETACS-ECU connector C-315 terminal No.13.) : Repair
the wiring harness between key reminder switch
connector C-211 (terminal No. 3) and ETACS-ECU
connector C-315 (terminal No. 13).
AC209731
Connector C-315
(harness side)
AC208731BP
AC709707
Harness side: C-315
IV
Harness side: C-211
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