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 

P.42B-12

).

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 

P.00-15

).

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 

P.54C-14

).

.

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 

P.54C-240

). 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 

P.42B-12

). Then go to Step 6.

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 

P.35C-20

).

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 

P.35C-20

). 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 

P.54A-582

).

Q: Is the check result normal?

YES : Diagnose the combination meter. (Refer to GROUP 

54A, Combination meter 

− diagnostic trouble code 

chart 

P.54A-28

) Go to Step 6.

NO :  Carry out the relevant troubleshooting. (Refer to 

GROUP 54A, ETACS 

− diagnostic trouble code chart 

P.54A-582

). 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) 

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

).

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 

P.54A-582

).

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 

P.42B-12

).

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 

P.00-15

).

AC608435

Data link connector

MB991827

MB991824

MB991910

AB