Mitsubishi Evolution X. Manual - part 606

DIAGNOSIS

TSB Revision

WIRELESS CONTROL MODULE (WCM)

42C-41

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

).

STEP 2. Check receiver antenna assembly connector D-14 
and WCM connector C-07 for loose, corroded or damaged 
terminals, or terminals pushed back in the connector.
Q: Is the receiver antenna assembly connector D-14 and 

WCM connector C-07 in good condition?
YES : Go to Step 3.
NO :  Repair the defective connector.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

DIAGNOSIS

TSB Revision

WIRELESS CONTROL MODULE (WCM)

42C-42

STEP 3. Check the wiring harness between the receiver 
antenna assembly connector D-14 (terminal Nos. 8, 12) and 
the WCM connector C-07 (terminal Nos. 8, 12) for open 
circuit.
(1) Disconnect reciever anntena assembly connector D-14 and 

WCM connector C-07, and check the wiring harness.

(2) Check the wiring harness between reciever anntena 

assembly connector D-14 (terminal No.8) and WCM 
connector C-07 (terminal No.8).

OK: Continuity exists (2 

Ω or less)

(3) Check the wiring harness between reciever anntena 

assembly connector D-14 (terminal No.12) and WCM 
connector C-07 (terminal No.12).

OK: Continuity exists (2 

Ω or less)

Q: Is the wiring harness between receiver antenna 

assembly connector D-14 (terminal Nos. 8, 12) and the 
WCM connector C-07 (terminal Nos. 8, 12) in good 
condition?
YES  : Go to Step 4.
NO (receiver antenna assembly connector D-14 terminal 
No.8  

− WCM connector C-07 terminal No.8.) : Repair the 

wiring harness between receiver antenna assembly 
connector D-14 (terminal No.8) and WCM connector 
C-07 (terminal No.8).

NO (receiver antenna assembly connector D-14 terminal 
No.12 

− WCM connector C-07 terminal No.12.) : Repair 

the wiring harness between receiver antenna 
assembly connector D-14 (terminal No.12) and WCM 
connector C-07 (terminal No.12).

AC709707 HT

Harness side: D-14

Harness side: C-07

AC709707 HU

Harness side: D-14

Harness side: C-07

DIAGNOSIS

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WIRELESS CONTROL MODULE (WCM)

42C-43

STEP 4. Check the wiring harness between the receiver 
antenna assembly connector D-14 (terminal Nos. 8, 12) and 
the ground for short circuit.
(1) Disconnect reciever anntena assembly connector D-14, 

and check the wiring harness.

(2) Check the wiring harness between reciever anntena 

assembly connector D-14 (terminal No.8) and and ground

OK: No continuity

(3) Check the wiring harness between reciever anntena 

assembly connector D-14 (terminal No.12) and and ground

OK: No continuity

Q: Is the wiring harness between receiver antenna 

assembly connector D-14 (terminal Nos. 8, 12) and the 
ground in good condition?
YES  : Go to Step 5.
NO (receiver antenna assembly connector D-14 terminal 
No.8 

− ground.) : Repair the wiring harness between 

receiver antenna assembly connector D-14  (terminal 
No.8) and the ground.

NO (receiver antenna assembly connector D-14 terminal 
No.12 

− ground.) : Repair the wiring harness between 

receiver antenna assembly connector D-14  (terminal 
No.12) and the ground.

STEP 5. Replace the receiver antenna assembly, and check 
whether the diagnostic trouble code is reset.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to 

the "ON" position.

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

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

P.42B-12

).

NO :  The procedure is complete.

AC709707FY

Harness side: D-14

AC709707FX

Harness side: D-14

DIAGNOSIS

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WIRELESS CONTROL MODULE (WCM)

42C-44

DTC B2416: ECU internal error

.

DTC SET CONDITION

WCM sets DTC B2416 when it determines an abnor-
mal status within itself.

.

TECHNICAL DESCRIPTION (COMMENT)

WCM determines that the abnormality is present, if 
the data abnormality is found when the ignition 
switch is turned ON and then EEPROM is written.

.

TROUBLESHOOTING HINTS

Malfunction of 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

Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.

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

position.

(4) Check if DTC is set.
(5) 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 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

).

AC608435

Data link connector

MB991827

MB991824

MB991910

AB