Mitsubishi Outlander GS45X. Manual - part 1117

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-47

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-17

).

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-49

 <2.4L 

Engine> or GROUP 13B, Diagnostic trouble code 
chart 

P.13B-50

 <3.0L Engine>).

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-39

 <B1761> and 

P.42B-55

 <B2206>.

NO :  Go to Step 4.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-48

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 

to 

P.42B-15

). 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.00-40

).

NO :  The procedure is complete.

DTC B1A35: Transponder read error

CAUTION

• When the DTC B1A35 is set, be sure to diag-

nose 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 the DTC B1A35.

.

TECHNICAL DESCRIPTION (COMMENT)

KOS-ECU determines that the abnormality is 
present, if it cannot receive the key ID for the emer-
gency 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 (Vehicles with 

CAN communication system)

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-49

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

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) With the emergency operation by the sufficient inverse 

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-17

).

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.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-50

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 : Go to Step 5.
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

).

STEP 5. Replace the keyless operation key and recheck 
the diagnostic trouble code.
Replace the keyless operation key for which the DTC is set 
with the other key, 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 : Go to Step 6.
NO :  Go to Step 7.

STEP 6. 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-15

), 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 7.
NO :  The procedure is complete.

STEP 7. Replace the keyless operation key and recheck 
the diagnostic 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-15

), 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 

to 

P.42B-15

).

NO :  The procedure is complete.