Mitsubishi Evolution X. Manual - part 600

DIAGNOSIS

TSB Revision

WIRELESS CONTROL MODULE (WCM)

42C-17

STEP 2. Using scan tool MB991958, check for 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. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(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 : Replace WCM and register the ID codes (Refer to 

P.42C-9

). After registering the ID codes, go to Step 4.

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 4. Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.
(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 : Replace the engine control module and record the 

VIN (Refer to GROUP 00 - How To Perform Vehicle 
Identification Number (VIN) Writing 

P.00-27

).

NO :  The procedure is complete.

DIAGNOSIS

TSB Revision

WIRELESS CONTROL MODULE (WCM)

42C-18

DTC B1761: VIN code not programmed

CAUTION

• When DTC B1761 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

WCM sets DTC B1761 when no VIN is recorded in it.

.

TECHNICAL DESCRIPTION (COMMENT)

WCM determines that the abnormality is present 
when no VIN is recorded in it.

.

TROUBLESHOOTING HINTS

• VIN not programmed

• Malfunction of the WCM

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle 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

).

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

DIAGNOSIS

TSB Revision

WIRELESS CONTROL MODULE (WCM)

42C-19

STEP 2. Register the VIN and recheck the diagnostic 
trouble code.
Register VIN in WCM [Refer to GROUP 00 

− How to Perform 

Vehicle Identification Number (VIN) Writing 

P.00-27

] and 

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

the "ON" position.

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

YES : Replace WCM and register the ID codes (Refer to 

P.42C-9

).

NO :  The procedure is complete.

DTC B1A08: Keyless/KOS key1 performance

 

DTC B1A09: Keyless/KOS key2 performance

 

DTC B1A0A: Keyless/KOS key3 performance

 

DTC B1A0B: Keyless/KOS key4 performance

 

DTC B1A0C: Keyless key 5 performance

 

DTC B1A0D: Keyless key 6 performance

 

DTC B1A0E: Keyless key 7 performance

 

DTC B1A0F: Keyless key 8 performance

CAUTION

When replacing the ECU, always check that the 
communication circuit is normal.

.

DTC SET CONDITION

The door locking/unlocking code is automatically 
updated every time the doors are locked (rolling 
code). WCM stores DTC B1A08, B1A09, B1A0A, 
B1A0B, B1A0C, B1A0D, B1A0E, or B1A0F when it 
receives wrong signal (rolling code out of synchroni-
sation) from the transmitter.

.

TECHNICAL DESCRIPTION (COMMENT)

• B1A08: WCM determines that the abnormality is 

present when the rolling code received from the 
transmitter 1 (the first transmitter registered in 
WCM) greatly differs from the rolling code stored 
in WCM.

• B1A09: WCM determines that the abnormality is 

present when the rolling code received from the 
transmitter 2 (the second transmitter registered in 
WCM) greatly differs from the rolling code stored 
in WCM.

• B1A0A: WCM determines that the abnormality is 

present when the rolling code received from the 
transmitter 3 (the third transmitter registered in 
WCM) greatly differs from the rolling code stored 
in WCM.

• B1A0B: WCM determines that the abnormality is 

present when the rolling code received from the 
transmitter 4 (the fourth transmitter registered in 
WCM) greatly differs from the rolling code stored 
in WCM.

• B1A0C: WCM determines that the abnormality is 

present when the rolling code received from the 
transmitter 5 (the fifth transmitter registered in 
WCM) greatly differs from the rolling code stored 
in WCM.

• B1A0D: WCM determines that the abnormality is 

present when the rolling code received from the 
transmitter 6 (the sixth transmitter registered in 
WCM) greatly differs from the rolling code stored 
in WCM.

• B1A0E: WCM determines that the abnormality is 

present when the rolling code received from the 
transmitter 7 (the seventh transmitter registered 
in WCM) greatly differs from the rolling code 
stored in WCM.

DIAGNOSIS

TSB Revision

WIRELESS CONTROL MODULE (WCM)

42C-20

• B1A0F: WCM determines that the abnormality is 

present when the rolling code received from the 
transmitter 8 (the eighth transmitter registered in 
WCM) greatly differs from the rolling code stored 
in WCM.

.

TROUBLESHOOTING HINTS

• Rolling code out of synchronisation

• Malfunction of the transmitter

• Malfunction of the WCM

DIAGNOSIS

STEP 1. Synchronise the rolling code and 
recheck the diagnostic trouble code.
(1) Synchronise the rolling code. Use either way to 

synchronise the rolling code:

• Push the transmitter switches twice or more.

• Resister the keyless ID (Refer to 

P.42C-114

).

NOTE: *: Name of the signals to be regis-
tered.

(2) Recheck if the DTC is set.

a. Erase the DTC.
b. Push the lock switch or unlock switch of 

transmitter.

c. Check if the DTC is set.

Q: Is the DTC set?

YES : 

Go to Step 2.

NO : 

The diagnosis is complete.

STEP 2. Check whether the diagnostic trouble 
code is reset.
Replace the transmitter by which the DTC is set with 
a new one, register the key ID and the keyless ID 
(Refer to 

P.42C-114

), and recheck if the DTC is set.

(1) Erase the DTC.
(2) Push the lock switch or unlock switch of 

transmitter.

(3) Check if the DTC is set.

Q: Is the DTC set?

YES : 

Replace WCM and register the ID codes 

(Refer to 

P.42C-9

).

NO : 

The diagnosis is complete.