Mitsubishi Evolution X. Manual - part 616

DIAGNOSIS

TSB Revision

WIRELESS CONTROL MODULE (WCM)

42C-81

PROBABLE CAUSES

• Malfunction of ETACS-ECU

• Engine control module malfunction

• ETACS-ECUs have been interchanged between two vehi-

cles.

• WCM malfunction

• External noise interference

• WCMs have been interchanged between two vehicles.

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 con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the 

Scan Tool (M.U.T.-III) 

P.42C-6

."

(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-82

STEP 2. Using scan tool MB991958, check for other 
system diagnostic trouble code.
Check if DTC is set to the ETACS-ECU or engine control mod-
ule.
Q: Is the DTC set?

YES (DTC is set to ETACS-ECU.) : Troubleshoot the 

ETACS (Refer to GROUP 54A 

− ETACS, Diagnosis 

P.54A-582

).

YES (DTC is set to the engine control module.) : 

Troubleshoot the MFI system (Refer to GROUP 13A 

− 

MFI, Diagnosis 

P.13A-44

).

NO  :  Go to Step 3.

STEP 3. Check part number of ETACS-ECU
Check the part number of ETACS-ECU.

OK: 8637A313

Q: Is the check result normal?

YES : Go to Step 4.
NO :  Replace ETACS-ECU.

STEP 4. Check part number of WCM
Check the part number of WCM.

OK: MN141352

Q: Is the check result normal?

YES : Go to Step 5.
NO :  Replace WCM and register the ID codes (Refer to 

P.42C-9

).

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 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

).

DIAGNOSIS

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WIRELESS CONTROL MODULE (WCM)

42C-83

DATA LIST REFERENCE TABLE

M1427501000034

Item No.

Scan tool MB991958 
display

Check conditions

Normal conditions

01

Received key data(ID)

−

Key ID for stored ignition key

02

Received key 
data(button)

−

Switch display of transmitter

13

Number of registered 
IMMOB.key

−

Number of stored ignition keys 
(Number of registered ignition 
keys that can start the engine)

21

Air pressure, Tire 1

−

−

22

Air pressure, Tire 2

23

Air pressure, Tire 3

24

Air pressure, Tire 4

25

*

Air pressure, Tire 5

31

Acceleration, Tire 1

−

−

32

Acceleration, Tire 2

33

Acceleration, Tire 3

34

Acceleration, Tire 4

35

*

Acceleration, Tire 5

36

Threshold of PRS. 
warning

The tire pressure is within the 
specified value range.

OFF

The tire pressure is not within 
the specified value range.

ON

37

Threshold of PRS. 
warning release

The tire pressure is within the 
specified value range.

ON

The tire pressure is not within 
the specified value range.

OFF

38

Number of registered 
TPMS ID

−

Number of stored TPMS

39

Ignition signal(CAN data) Ignition switch status 

information received from 
ETACS-ECU via CAN:ON

ON

Ignition switch status 
information received from 
ETACS-ECU via CAN:OFF

OFF

40

Ignition signal(Port input) Ignition switch: ON

ON

Ignition switch: OFF

OFF

41

VSS

Drive the vehicle

The scan tool and the 
speedometer readings are 
approximately the same

50

Registered ID reception, 
Tier1 

Ignition switch: ON

Yes

Ignition switch: OFF

No

51

Registered ID reception, 
Tier2 

Ignition switch: ON

Yes

Ignition switch: OFF

No

DIAGNOSIS

TSB Revision

WIRELESS CONTROL MODULE (WCM)

42C-84

NOTE: 

*

 shows that it is displayed but not used.

TROUBLE SYMPTOM CHART

M1427500400169

CAUTION

During diagnosis, a DTC associated with other system may be set when the ignition switch is turned 
on with connector(s) disconnected. On completion, check all systems for DTC(s). If DTC(s) are set, 
erase them all.

52

Registered ID reception, 
Tier3 

Ignition switch: ON

Yes

Ignition switch: OFF

No

53

Registered ID reception, 
Tier4 

Ignition switch: ON

Yes

Ignition switch: OFF

No

54

*

Registered ID reception, 
Tier5

Ignition switch: ON

Yes

Ignition switch: OFF

No

61

Air pressure, Tire1(not 
adjusted)

−

−

62

Air pressure, Tire2(not 
adjusted)

63

Air pressure, Tire3(not 
adjusted)

64

Air pressure, Tire4(not 
adjusted)

65

*

Air pressure, Tire5(not 
adjusted)

Item No.

Scan tool MB991958 
display

Check conditions

Normal conditions

Trouble symptom

Inspection 
procedure 
number

Reference 
page

Scan tool cannot communicate with WCM.

1

P.42C-85

The ignition key cannot be registered using scan tool.

2

P.42C-86

Engine does not start (cranking but no initial combustion).

3

P.42C-88

Abnormality in WCM power supply and ground circuits.

4

P.42C-90

Keyless entry system does not work.

5

P.42C-93

Keyless entry hazard light answerback function, the dome light answerback 
function or the horn answerback function does not work normally.

6

P.42C-102

The timer lock function does not work after doors have been unlocked by the 
keyless entry system.

7

P.42C-104

The trunk is not opened when the keyless entry transmitter "TRUNK" button 
is operated.

8

P.42C-105