Mitsubishi Outlander GS45X. Manual - part 1118

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-51

DTC B2101: IG SW start POS.circuit low

 

DTC B2102: IG SW start POS.circuit high

CAUTION

• If the DTC 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.

.

DTC SET CONDITION

If the actual ignition switch status is different from the 

ignition switch status information received from 
ETACS-ECU via CAN, KOS-ECU sets the diagnostic 
trouble code No. B2101 or B2102.

ACA02750

34

KOS-ECU Communication Circuit

ETACS-
ECU

IG1 
RELAY

KOS-ECU

POWER 
SUPPLY

IGNITION 
SWITCH (IG1)

FUSIBLE 
LINK

AB

AC701632AD

Connector: C-317

AC702145

Connector: C-102

AB

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-52

.

TECHNICAL DESCRIPTION (COMMENT)

If the difference in the ignition switch level shown 
below occurs consecutively 10 times with the ignition 
switch being the ON position or START position, 
when the CAN message (ignition switch position 
information) from ETACS-ECU, KOS-ECU deter-
mines that there is a problem.

B2101

• Status of ignition switch: ON position

• Ignition switch position information: OFF

B2102

• Status of ignition switch: OFF position

• Ignition switch position information: ON

.

TROUBLESHOOTING HINTS

• Malfunction of CAN bus line

• Malfunction of the KOS-ECU

• Malfunction of the ignition switch

• Damaged wiring harness and connectors

• Malfunction of ETACS-ECU

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)

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. Check ETACS-ECU connector C-317 and 
KOS-ECU connector C-102 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Is ETACS-ECU connector C-317 and KOS-ECU 

connector C-102 in good condition?
YES : Go to Step 3.
NO :  Repair the defective connector.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-53

STEP 3. Check the wiring harness between KOS-ECU 
connector C-102 (terminal No.39) and ETACS-ECU 
connector C-317 (terminal No.5).

• Check the power supply line for open circuit.

Q: Is the wiring harness between KOS-ECU connector 

C-102 (terminal No. 39) and ETACS-ECU connector 
C-317 (terminal No. 5) in good condition?
YES : Go to Step 4.
NO :  Repair the wiring harness.

STEP 4. Using scan tool MB991958, check data list.
Use the ETACS-ECU data list to check the signals related to 
the ignition voltage.
Turn the ignition switch from "LOCK" (OFF) position to "ON" 
position.

Q: Does scan tool MB991958 display the item "IG voltage" 

as normal condition?
YES : Go to Step 5.
NO :  Diagnose the ETACS-ECU. Refer to GROUP 54A, 

Diagnosis 

P.54A-733

.

STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(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-15

.)

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

).

Item No.

Item name

Normal 
conditions

Item 254

IG voltage

Battery 
positive 
voltage

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-54

DTC B2204: Coding data mismatch

CAUTION

• When the DTC B2204 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 the vehicle information data transmitted from the 
ETACS-ECU via the CAN bus lines is different from 
that registered in the KOS-ECU, the KOS-ECU sets 
DTC No. B2204.

.

TECHNICAL DESCRIPTION (COMMENT)

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.

.

TROUBLESHOOTING HINTS

• Malfunction of KOS-ECU

• Malfunction of ETACS-ECU

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)

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

).

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector