Mitsubishi Evolution X. Manual — part 616
DIAGNOSIS
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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)
(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,
).
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
).
YES (DTC is set to the engine control module.) :
Troubleshoot the MFI system (Refer to GROUP 13A
−
MFI, Diagnosis
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
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
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
DIAGNOSIS
TSB Revision
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
The ignition key cannot be registered using scan tool.
2
Engine does not start (cranking but no initial combustion).
3
Abnormality in WCM power supply and ground circuits.
4
Keyless entry system does not work.
5
Keyless entry hazard light answerback function, the dome light answerback
function or the horn answerback function does not work normally.
6
The timer lock function does not work after doors have been unlocked by the
keyless entry system.
7
The trunk is not opened when the keyless entry transmitter "TRUNK" button
is operated.
8
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