Mitsubishi Outlander (2013+). Manual - part 539

TROUBLESHOOTING <KOS-ECU>

KEYLESS OPERATION SYSTEM (KOS)

42B-17

The engine switch can be turned from LOCK (OFF) 
to ACC, ON, START positions by operating all of 
the keyless operation keys. : 

Check if the 

diagnosis code is set. If the diagnosis code 
is erased, the diagnosis is complete. If not, 
go to Step 5.

The engine switch cannot be turned from LOCK 
(OFF) to ACC, ON, START positions by operating 
all of the keyless operation keys. : 

Go to Step 4

STEP 4. Replace the keyless operation key(s) 
which cannot activate the engine switch with a 
new one.
(1) Replace the keyless operation key(s) which 

cannot activate the engine switch with a new one.

(2) Register a new keyless operation key (Refer to 

P.42B-88

).

(3) Check that all of the registered keyless operation 

keys allow the engine switch to be turned from 
OFF to ACC, ON, START positions.
a. Remove the batteries from all of the keyless 

operation keys (Refer to 

P.42B-98

).

b. Insert one of the keyless operation keys into 

the key slot.

c. Check whether the engine switch can be 

turned from LOCK (OFF) to ACC, ON, START 
positions.

d. Turn the engine switch to LOCK (OFF) 

position again.

e. Repeat the same procedure for the other 

keyless operation keys.

f.

Install the batteries to all the keyless 
operation keys.

Q: Is the check result normal?

YES : 

Go to Step 6

NO : 

Replace KOS-ECU and register the ID 
codes (Refer to 

P.42B-88

).

STEP 5. Replace the KOS-ECU, and then register 
all of the keyless operation keys again.
(1) Replace KOS-ECU and register the ID codes 

(Refer to 

P.42B-88

).

(2) Register all of the keyless operation keys again 

(Refer to 

P.42B-88

).

(3) Check that all of the registered keyless operation 

keys allow the engine switch to be turned from 
OFF to ACC, ON, START positions.
a. Remove the batteries from all of the keyless 

operation keys (Refer to 

P.42B-98

).

b. Insert one of the keyless operation keys into 

the key slot.

c. Check whether the engine switch can be 

turned from LOCK (OFF) to ACC, ON, START 
positions.

d. Turn the engine switch to LOCK (OFF) 

position again.

e. Repeat the same procedure for the other 

keyless operation keys.

f.

Install the batteries to all the keyless 
operation keys.

Q: Is the check result normal?

YES : 

Go to Step 6

NO : 

Replace KOS-ECU and register the ID 
codes (Refer to 

P.42B-88

).

STEP 6. Check whether the diagnosis code is 
reset.
(1) Erase the diagnosis code.
(2) Turn the power supply mode of the engine switch 

from OFF to ON.

(3) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace KOS-ECU and register the ID 

codes (Refer to 

P.42B-88

).

NO : 

Intermittent malfunction is suspected (Refer 
to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

Code No.B2101 IG SW start POS circuit low

 

Code No.B2102 IG SW start POS circuit high

CAUTION

• If the diagnosis code No. B2101 or B2102 is 

set in KOS-ECU, always diagnose the CAN 
bus lines.

• Before replacing the ECU, ensure that the 

communication circuit is normal.

TROUBLE JUDGEMENT

If the actual engine switch status is different from the 
engine switch status information received from 
ETACS-ECU via CAN, KOS-ECU sets the diagnosis 
code No. B2101 or B2102.

TROUBLESHOOTING <KOS-ECU>

KEYLESS OPERATION SYSTEM (KOS)

42B-18

JUDGEMENT CRITERIA

If the engine switch status is infeasible consecutively 
ten times the KOS-ECU will judge that the system is 
defective.

B2101

• Engine switch power supply mode: OFF

• Engine switch information from ETACS-ECU: ON

B2102

• Engine switch power supply mode: ON

• Engine switch information from ETACS-ECU: 

OFF

PROBABLE CAUSES

• Malfunction of CAN bus line

• Malfunction of the KOS-ECU

• Malfunction of the OSS-ECU

• Damaged wiring harness and connectors

• Malfunction of ETACS-ECU

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2

NO : 

Repair the CAN bus line (Refer to GROUP 
54C 

− Troubleshooting ). On completion, go 

to Step 2.

STEP 2. M.U.T.-III other system diagnosis code
Check if any diagnosis code is set to the OSS-ECU.

Q: Is the diagnosis code set?

YES : 

Perform troubleshooting for the OSS-ECU 

(Refer to Troubleshooting 

P.42B-11

). On 

completion, go to Step 3.

NO : 

Go to Step 3

STEP 3. M.U.T.-III other system data list
Use M.U.T.-III to check the ETACS-ECU service 
data. (Refer to GROUP 54A 

− ETACS-ECU, Service 

Data Reference List ).

• Item 254: IG voltage

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 4

NO : 

Perform troubleshooting for ETACS-ECU 
(Refer to GROUP 54A 

− ETACS-ECU − 

Troubleshooting ).

STEP 4. Check whether the diagnosis code is 
reset.
(1) Erase the diagnosis code.
(2) Turn the power supply mode of the engine switch 

from OFF to ON.

(3) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace KOS-ECU and register the ID 

codes (Refer to 

P.42B-88

).

NO : 

Intermittent malfunction is suspected (Refer 
to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

Code No.B2204 Coding data mismatch

CAUTION

• When the diagnosis code No. B2204 is set, be 

sure to diagnose the CAN bus line.

• When replacing the ECU, always check that 

the communication circuit is normal.

DIAGNOSIS FUNCTION

If the vehicle information data on the CAN bus lines 
is different from that registered with KOS-ECU, 
KOS-ECU sets the diagnosis code No. B2204.

JUDGMENT CRITERIA

KOS-ECU determines that the abnormality is present 
when the vehicle information registered in it does not 
match the vehicle information on the CAN bus lines.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Malfunction of KOS-ECU

• Malfunction of ETACS-ECU

DIAGNOSIS PROCEDURE

1. M.U.T.-III CAN bus diagnostics

2. M.U.T.-III other system diagnosis code

3. Check whether the diagnosis code is reset.

TROUBLESHOOTING <KOS-ECU>

KEYLESS OPERATION SYSTEM (KOS)

42B-19

Code No.B2206 Chassis No. mismatch

DIAGNOSIS FUNCTION

KOS-ECU sets diagnosis code No. B2206 when 
chassis number registered in it and chassis number 
that has been transmitted on the CAN bus do not 
match.

JUDGEMENT CRITERIA

KOS-ECU determines that the abnormality is present 
when chassis number registered in it and the one 
that has been transmitted on the CAN bus do not 
match.

PROBABLE CAUSES

• Malfunction of KOS-ECU (KOS-ECU being regis-

tered to another vehicle)

• Malfunction of engine-ECU (Chassis number reg-

istered in engine-ECU unmatched)

DIAGNOSIS PROCEDURE

1. Check of chassis number registered in the 

engine-ECU and matching check of vehicle's 
chassis number.

2. Check whether the diagnosis code is reset 

(KOS-ECU).

3. Check whether the diagnosis code is reset 

(engine-ECU).

Code No.B2352 Antenna fail

CAUTION

Before replacing the ECU, ensure that the com-
munication circuit is normal.

DIAGNOSIS FUNCTION

If an open circuit or short to earth occurs in the key 
slot, KOS-ECU sets the diagnosis code No. B2352.

JUDGMENT CRITERIA

When the engine switch power supply mode is set 
from OFF to ON or the driver’s door is opened with 
the engine switch power supply mode at OFF after 
the battery-discharged keyless operation key is 
inserted into the key slot, the KOS-ECU will send a 
signal to the key slot. Then the key slot will send a 
code to the keyless operation key via its antenna. If 
the KOS-ECU detects open circuit or short circuit to 
earth consecutively four times during the operation 
above, the ECU will set this diagnosis code.

PROBABLE CAUSES

• Malfunction of the key slot

• Damaged wiring harness and connectors

• Malfunction of KOS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Key slot check
Check that the key slot is normal (Refer to Inspection 

P.42B-100

).

Q: Is the check result normal?

YES : 

Go to Step 2

NO : 

Replace the key slot.

STEP 2. Check of short to power supply, short to 
earth, and open circuit in ANTP, ANTG line 
between the key slot connector and the 
KOS-ECU connector.

Q: Is the check result normal?

YES : 

Go to Step 3

NO : 

Repair the wiring harness.

STEP 3. Check whether the diagnosis code is 
reset.
(1) Open the driver's door.
(2) Turn the power supply mode of the engine switch 

from OFF to ON.

(3) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace KOS-ECU and register the ID 

codes (Refer to 

P.42B-88

).

NO : 

The diagnosis is complete.

TROUBLESHOOTING <KOS-ECU>

KEYLESS OPERATION SYSTEM (KOS)

42B-20

Code No.B2400 KOS key registration fail

CAUTION

• If the diagnosis code No. B2400 is set, diag-

nose the CAN bus lines.

• When replacing the ECU, always check that 

the communication circuit is normal.

DIAGNOSIS FUNCTION

If the registration of the keyless operation key ID to 
KOS-ECU fails, KOS-ECU sets the diagnosis code 
No. B2400.

JUDGEMENT CRITERIA

Assuming that another keyless operation key has 
already been registered with KOS-ECU, if the regis-
tration of the keyless operation key ID fails when a 
new keyless operation key is added or the existing 
key is replaced, KOS-ECU determines that there is a 
problem.

PROBABLE CAUSES

• At the registration, there is an object near the 

keyless operation key which interferes with the 
communication.

• Wrong keyless operation key registration method

• Failure of keyless operation key code registration

• Battery drain of keyless operation key

• Malfunction of the keyless operation key

• Malfunction of CAN bus line

• Malfunction of KOS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Interference check at keyless operation 
key registration
At the keyless operation key registration, check if 
there is another key nearby or anything that inter-
feres with the communication (magnets or objects 
that generate radio waves such as air-cleaning 
devices with a power plug).

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.

NO : 

Go to Step 2

STEP 2. Check of keyless operation key 
registration method
Check that the correct method was used at the regis-
tration of keyless operation key.

Q: Is the check result normal?

YES : 

Go to Step 3

NO : 

Register the keyless operation key.(Refer to 

P.42B-88

.)

STEP 3. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 4

NO : 

Repair the CAN bus line (Refer to GROUP 
54C 

− Troubleshooting ). On completion, go 

to Step 4.

STEP 4. M.U.T.-III diagnosis code
Check if any diagnosis code is set to the KOS-ECU.

Q: Is the diagnosis code set?

YES : 

 Refer to diagnosis code chart 

P.42B-11

.

NO : 

Go to Step 5

STEP 5. Replace the battery in the keyless 
operation key and recheck the diagnosis code.
Replace the battery of the keyless operation key, 
which the diagnosis code is stored in, with new one, 
register the key ID and keyless operation key ID 
(refer to 

P.42B-88

), and check whether the diagnosis 

code is stored again.
(1) Turn the power supply mode of the engine switch 

from OFF to ON.

(2) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Go to Step 6

NO : 

The diagnosis is complete (Discharged 
battery).

STEP 6. Replace the keyless operation key and 
recheck the diagnosis code.
Replace the keyless operation key for which the 
diagnosis code is set with a new one, register the key 
ID and keyless operation key ID (refer to 

P.42B-88

), 

and check whether the diagnosis code is reset again.
(1) Turn the power supply mode of the engine switch 

from OFF to ON.

(2) Check if the diagnosis code is set.

Q: Is the diagnosis code set?