Mitsubishi Evolution X. Manual - part 531

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-31

STEP 4. Register the key ID and recheck the diagnostic
trouble code.
Register the key ID and keyless operation key ID of the keyless
operation key by which the DTC is set (refer to

P.42B-12

), and

recheck if the DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) position to

the "ON" position.

(2) Check if the DTC is set.
Q: Is the DTC set?

YES : Go to Step 5.
NO : The procedure is complete.

STEP 5. Replace the keyless operation key and recheck
the diagnostric trouble code.
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

P.42B-12

), and check whether the DTC is reset.

(1) Turn the ignition switch from the "LOCK" (OFF) position to

the "ON" position.

(2) Check if the DTC is set.
Q: Is the DTC set?

YES : Replace KOS-ECU and register the ID codes (Refer

P.42B-12

NO : The procedure is complete.

DTC B1A28: Engine control module authenticate error

CAUTION

• When DTC B1A28 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

If the key certification result by KOS-ECU does not
match with the engine control module status,
KOS-ECU sets DTC B1A28.

TECHNICAL DESCRIPTION (COMMENT)

KOS-ECU determines that the abnormality is
present, if the key certification result and the engine
control module status do not match after the engine
start permission communication is completed.

TROUBLESHOOTING HINTS

• Malfunction of CAN bus line

• Malfunction of KOS-ECU

• Malfunction of engine control module

• VIN registered in engine control module

unmatched

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

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-32

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,

Diagnosis

P.54C-14

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

P.13A-44

NO : Go to Step 3.

STEP 3. Using scan tool MB991958, read the diagnostic
trouble code.
Check if the DTC is set to the KOS-ECU.
(1) Turn the ignition switch from the "LOCK" (OFF) position to

the "ON" position.

(2) Check if the DTC is set.
Q: Is DTC B1761 or B2206 set other than B1A28?

YES : Perform the troubleshooting for each DTC. Refer to

P.42B-24

<B1761> and

P.42B-41

<B2206>.

NO : Go to Step 4.

AC608435

Data link connector

MB991827

MB991824

MB991910

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-33

STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set to the KOS-ECU.
(1) Turn the ignition switch from the "LOCK" (OFF) position to

the "ON" position.

(2) Check if the DTC is set.
Q: Is the DTC set?

YES : Replace KOS-ECU and register the ID codes (Refer

P.42B-12

). Then go to Step 5.

NO : The diagnosis is complete.

STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set to the KOS-ECU.
(1) Turn the ignition switch from the "LOCK" (OFF) position to

the "ON" position.

(2) Check if the DTC is set.
Q: Is the DTC set?

YES : Replace the engine control module and record VIN

(Refer to GROUP 00

− How to Perform Vehicle

Identification Number (VIN) Writing

P.00-27

NO : The procedure is complete.

DTC B1A35: Transponder read error

CAUTION

• When DTC B1A35 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

If no transponder data can be received, KOS-ECU
sets DTC B1A35.

TECHNICAL DESCRIPTION (COMMENT)

KOS-ECU determines that the abnormality is
present, if it cannot receive the key ID for the keyless
operation key when the ignition switch is turned ON.

TROUBLESHOOTING HINTS

• Insufficient inverse insertion of keyless operation

key at the emergency operation

• Malfunction of CAN bus line

• Malfunction of the keyless operation key

• Interference of the key ID

• Malfunction of KOS-ECU

• Ignition switch ON by the emergency key only

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

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-34

STEP 1. Sufficiently insert the keyless operation key in the
inverted direction at the emergency operation, and
recheck the diagnostic trouble code.
With the emergency operation by the sufficient inverse inser-
tion of keyless operation key, recheck if the DTC is set.

CAUTION

insertion of keyless operation key, turn the ignition switch
from the LOCK (OFF) position to the ON position.

(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Go to Step 2.
NO : The procedure is complete.

STEP 2. Using scan tool MB991958, diagnose the CAN bus
line.
(1) Turn the ignition switch to the "ON" position.
(2) Diagnose the CAN bus line.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 3.
NO : Repair the CAN bus line (Refer to GROUP 54C,

Diagnosis

P.54C-14

STEP 3. Check the emergency key and keyless operation
key inserted in the key cylinder for interference.
Check if there are other keys or anything that interferes with the
communication (things that generate radio waves such as mag-
nets and an air-cleaning device that has a power plug) near the
key inserted in the key cylinder.
Q: Are there other keys or anything that interferes with the

communication?
YES : Move away or remove other keys or anything that

interferes with the communication, and go to Step 4.

NO : Go to Step 5.

AC608435

Data link connector

MB991827

MB991824

MB991910

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