Mitsubishi Evolution X. Manual — part 529
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-23
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool (MB991958), always turn
the ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool (MB991958).
(1) Connect scan tool MB991958 to the data link connector.
(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,
).
STEP 2. Using scan tool MB991958, read the engine
control module diagnostic trouble code
Check again if the DTC is set to the engine control module.
Q: Is the DTC set?
YES : Troubleshoot the MFI system (Refer to GROUP 13A,
Diagnostic trouble code chart
).
NO : Go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the KOS-ECU.
(1) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(2) Check if DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace KOS-ECU and register the ID codes (Refer
to
). After registering the ID codes, go to
Step 4.
NO : The trouble can be an intermittent malfunction (Refer
to GROUP 00
− How to use
Troubleshooting/inspection Service Points
− How to
Cope with Intermittent Malfunction
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-24
STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set to the KOS-ECU.
(1) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(2) Check if DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace the engine control module and record the
VIN (Refer to GROUP 00 - How To Perform Vehicle
Identification Number (VIN) Writing
).
NO : The procedure is complete.
DTC B1761: VIN code not programmed
CAUTION
• When the DTC No. B1761 is set, be sure to
diagnose the CAN bus line.
• When replacing the ECU, always check that
the communication circuit is normal.
.
DTC SET CONDITION
KOS-ECU sets DTC B1761 when no VIN is recorded
in it.
.
TECHNICAL DESCRIPTION (COMMENT)
KOS-ECU determines that the abnormality is present
when no VIN is recorded in it.
.
TROUBLESHOOTING HINTS
• VIN not programmed
• Malfunction of the KOS-ECU
DIAGNOSIS
Required Special Tools:
• 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
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-25
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool (MB991958), always turn
the ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool (MB991958).
(1) Connect scan tool MB991958 to the data link connector.
(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,
).
STEP 2. Register the VIN and recheck the diagnostic
trouble code.
Register VIN in KOS-ECU (Refer to GROUP 00
− How to Per-
form Vehicle Identification Number (VIN) Writing
) and
recheck if the DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) position to
the "ON" position.
(2) Check if DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace KOS-ECU and register the ID codes (Refer
to
NO : The procedure is complete.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-26
DTC B1A08: Keyless/KOS key1 performance
DTC B1A09: Keyless/KOS key2 performance
DTC B1A0A: Keyless/KOS key3 performance
DTC B1A0B: Keyless/KOS key4 performance
CAUTION
When replacing the ECU, always check that the
communication circuit is normal.
.
DTC SET CONDITION
The mechanism which automatically changes a code
for lock/unlock each time a lock operation is per-
formed is referred to as a rolling code. If KOS-ECU
receives wrong signal (out of synchronization of a
rolling code) from the keyless operation key,
KOS-ECU memorizes DTC B1A08.
.
TECHNICAL DESCRIPTION (COMMENT)
• B1A08: If the difference between the rolling code
for the keyless operation key 1 (the first keyless
operation key registered with KOS-ECU) and that
memorized by KOS-ECU is large, it is judged as
abnormal.
• B1A09: If the difference between the rolling code
for the keyless operation key 2 (the second key-
less operation key registered with KOS-ECU) and
that memorized by KOS-ECU is large, it is judged
as abnormal.
• B1A0A: If the difference between the rolling code
for the keyless operation key 3 (the third keyless
operation key registered with KOS-ECU) and that
memorized by KOS-ECU is large, it is judged as
abnormal.
• B1A0B: If the difference between the rolling code
for the keyless operation key 4 (the fourth keyless
operation key registered with KOS-ECU) and that
memorized by KOS-ECU is large, it is judged as
abnormal.
.
TROUBLESHOOTING HINTS
• Rolling code out of synchronization
• Malfunction of the keyless operation key
• Malfunction of the KOS-ECU
DIAGNOSIS
STEP 1. Synchronize the rolling code and
recheck the diagnostic trouble code.
Synchronize the rolling codes, and check whether
the DTC is reset.
(1) Erase the DTC.
(2) Turn the ignition switch from the LOCK (OFF)
position to the ON position.
(3) Press the lock or unlock switch of the keyless
operation key for which the diagnosis code is set
at least once to synchronize the rolling codes.
(4) Check if the DTC is set.
Q: Is the DTC set?
YES :
Go to Step 2.
NO :
The diagnosis is complete.
STEP 2. Check whether the diagnostic trouble
code is reset.
Replace the keyless operation key for which the DTC
is set with a new one, register the key ID and keyless
operation key ID (refer to
), and check
whether the DTC is reset.
(1) Erase the DTC.
(2) Turn the ignition switch from the LOCK (OFF)
position to the ON position.
(3) Check if the DTC is set.
Q: Is the DTC set?
YES :
Replace KOS-ECU and register the ID
codes (Refer to
NO :
The diagnosis is complete.
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