Mitsubishi Evolution X. Manual — part 564
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-163
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the KOS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) 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 trouble can be an intermittent malfunction (Refer
to GROUP 00
− How to use
Troubleshooting/inspection Service Points
− How to
Cope with Intermittent Malfunction
DTC U1412: Implausible Vehicle Speed Signal Received
CAUTION
If there is any problem in the CAN bus lines, an incorrect
diagnostic trouble code may be set. Prior to this diagno-
sis, diagnose the CAN bus lines (Refer to GROUP 54C,
Trouble code diagnosis
.
DTC SET CONDITION
KOS-ECU receives the wheel speed information from
ASC-ECU via the CAN-bus line. If KOS-ECU cannot receive
the information about the wheel speed sensor from ASC-ECU,
this code is set.
.
TROUBLESHOOTING HINTS
The most likely causes for this DTC to set are:
• Damaged wiring harness and connector
• Malfunction of ASC-ECU
• Malfunction of KOS-ECU
• Malfunction of ETACS-ECU
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
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-164
STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP 54C
−
CAN Bus Diagnostics table
). On
completion, go to Step 2.
STEP 2. Diagnostic trouble code recheck after resetting
CAN bus lines
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC U1412 set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Vehicle speed check by combination meter
When the vehicle is driven, check whether the proper vehicle
speed is shown on the combination meter or not.
Q: Is the check result normal?
YES : Replace the KOS-ECU and register ID codes (Refer
to
NO : Go to Step 4.
STEP 4. Check for other diagnostic trouble code.
Check if the diagnostic trouble code is set from ASC-ECU
(Refer to GROUP 35C, diagnostic trouble code chart
).
Q: Is the check result normal?
YES : Go to Step 5.
NO : Carry out the relevant troubleshooting. (Refer to
GROUP 35C, diagnostic trouble code chart
). Then go to Step 5.
STEP 5. Check for other diagnostic trouble code.
Check if the diagnostic trouble code is set from ETACS-ECU
(Refer to GROUP 54A, ETACS
− diagnostic trouble code chart
).
Q: Is the check result normal?
YES : Diagnose the combination meter. (Refer to GROUP
54A, Combination meter
− diagnostic trouble code
chart
) Go to Step 6.
NO : Carry out the relevant troubleshooting. (Refer to
GROUP 54A, ETACS
− diagnostic trouble code chart
). Then go to Step 6.
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-165
STEP 6. Recheck for diagnostic trouble code.
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC U1412 set?
YES : Start over at Step 1.
NO : The procedure is complete.
DTC U1415: Coding not completed/Data fail
CAUTION
• If DTC U1415 is set, diagnose the CAN bus
lines.
• When replacing the ECU, always check that
the communication circuit is normal.
.
DIAGNOSTIC FUNCTION
If the vehicle information data is not registered to the
combination meter, the KOS-ECU sets DTC U1415.
.
JUDGMENT CRITERIA
With the global coding counter value "0," if all the glo-
bal coding data (vehicle information) are not stored,
the KOS-ECU determines that a problem has
occurred.
.
TROUBLESHOOTING HINTS
• The CAN bus line may be defective.
• The KOS-ECU may be defective.
• The ETACS-ECU may be defective.
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
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-166
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 con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
Scan Tool (M.U.T.-III)
(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 ETACS-ECU
diagnostic trouble code.
Check if DTC is set to the ETACS-ECU.
Q: Is the DTC set?
YES : Troubleshoot the ETACS-ECU (Refer to GFROUP
54A, Diagnosis
NO : Go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the KOS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) 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 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
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