Mitsubishi Evolution X. Manual - part 535

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-47

STEP 3. Check the wiring harness between the receiver 
antenna module connector C-08 (terminal Nos. 2, 1, 8, 12) 
and the ground for short circuit.
(1) Disconnect reciever anntena module connector C-08, and 

check the wiring harness.

(2) Check the wiring harness between reciever anntena 

module connector C-08 (terminal No.2) and ground

OK: No Continuity

(3) Check the wiring harness between reciever anntena 

module connector C-08 (terminal No.1) and ground

OK: No Continuity

(4) Check the wiring harness between reciever anntena 

module connector C-08 (terminal No.8) and ground

OK: No Continuity

AC709707

Harness side: C-08

FQ

AC709707FR

Harness side: C-08

AC709707FS

Harness side: C-08

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-48

(5) Check the wiring harness between reciever anntena 

module connector C-08 (terminal No.12) and ground

OK: No Continuity

Q: Is the wiring harness between receiver antenna module 

connector C-08 (terminal Nos. 2, 1, 8, 12) and the ground 
in good condition?
YES  : Go to Step 4.
NO (receiver antenna module connector C-08 terminal 
No.2 

− ground.) : Repair the wiring harness between 

receiver antenna module connector C-08  (terminal 
No. 2) and the ground.

NO (receiver antenna module connector C-08 terminal 
No.1 

− ground.) : Repair the wiring harness between 

receiver antenna module connector C-08  (terminal 
No. 1) and the ground.

NO (receiver antenna module connector C-08 terminal 
No.8 

− ground.) : Repair the wiring harness between 

receiver antenna module connector C-08  (terminal 
No. 8) and the ground.

NO (receiver antenna module connector C-08 terminal 
No.12 

− ground.) : Repair the wiring harness between 

receiver antenna module connector C-08  (terminal 
No. 12) and the ground.

STEP 4. Replace the receiver antenna module, and check 
whether the diagnostic trouble code is reset.

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 

scan too (M.U.T.-III) 

P.42B-10

."

(2) Erase the DTC.
(3) Turn the ignition switch from the "LOCK" (OFF) position to 

the "ON" position.

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

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

to 

P.42B-12

).

NO :  The procedure is complete.

AC709707FT

Harness side: C-08

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-49

DTC B2400: KOS key registration fail

CAUTION

• If DTC B2400 is set, diagnose the CAN bus 

lines.

• When replacing the ECU, always check that 

the communication circuit is normal.

Receiver Antenna  Module and KOS-ECU Circuit

KOS-ECU

IMMOBILIZER
ANTENNA

RECEIVER

RECEIVER ANTENNA
ASSEMBLY

RECEIVER ANTENNA
MODULE

JOINT
CONNECTOR (6)

AC708950AX

C-41

Connectors: C-05, C-41

C-05

AC708951CG

Connectors: C-08, C-16

C-16 (B)

C-08

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-50

.

DTC SET CONDITION

If the registration of the keyless operation key ID to 
KOS-ECU fails, KOS-ECU sets DTC B2400.

.

TECHNICAL DESCRIPTION (COMMENT)

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.

.

TROUBLESHOOTING HINTS

• Keyless operation key ID registration failure

• Malfunction of the keyless operation key

• Malfunction of CAN bus line

• Battery drain of keyless operation key

• Damaged wiring harness and connectors

• Malfunction of reciever antenna assembly

• Malfunction of reciever antenna module

• Malfunction of KOS-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

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

).

AC708955AM

Connector: D-14

AC608435

Data link connector

MB991827

MB991824

MB991910

AB