Mitsubishi Evolution X. Manual — part 603
DIAGNOSIS
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WIRELESS CONTROL MODULE (WCM)
42C-29
STEP 4. Replace the ignition key and recheck the
diagnostic trouble code.
Replace the ignition key by which the DTC is set with the other
key, and recheck if the DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) position to
the "ON" position.
(2) Check if the DTC is set.
Q: Is the DTC set?
YES : Go to Step 5.
NO : Go to Step 6.
STEP 5. Register the key ID and recheck the diagnostic
trouble code.
Register the key ID of the ignition key (refer to
recheck if the DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) position to
the "ON" position.
(2) Check if the DTC is set.
Q: Is the DTC set?
YES : Go to Step 6.
NO : The procedure is complete.
STEP 6. Replace the ignition key and recheck the
diagnostic trouble code.
Replace the ignition key by which the DTC is set with a new
one, register the key ID of the new key, (refer to
), and
recheck if the DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) position to
the "ON" position.
(2) Check if the DTC is set.
Q: Is the DTC set?
YES : Replace WCM and register the ID codes (Refer to
NO : The procedure is complete.
DIAGNOSIS
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WIRELESS CONTROL MODULE (WCM)
42C-30
DTC B2101: IG SW start POS.circuit low
DTC B2102: IG SW start POS.circuit high
CAUTION
• If DTC B2101 or B2102 is set, be sure to diag-
nose the CAN bus line.
• Before replacing the ECU, ensure that the
communication circuit is normal.
.
WCM Communication Circuit
34
FUSIBLE
LINK
IGNITION
SWITCH (IG1)
ETACS-
ECU
IMMOBILIZER
ANTENNA
KEY ID
TRANSPONDER
IG1
RELAY
WCM
AC708951CD
Connector: C-07
C-07
AC708972AB
Connector: C-317
Junction block
DIAGNOSIS
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WIRELESS CONTROL MODULE (WCM)
42C-31
DTC SET CONDITION
WCM sets DTC B2101 or B2102 when the actual
state of the ignition switch and the ignition switch
position information received from ETACS-ECU via
CAN do not match.
.
TECHNICAL DESCRIPTION (COMMENT)
WCM determines that the abnormality is present, if it
has detected discrepancy in the ignition switch level
shown below ten consecutive times when WCM has
received the CAN message (ignition switch position
information) from ETACS-ECU with the ignition
switch turned to the ON or START position.
B2101
• Status of ignition switch: OFF position
• Ignition switch position information from the
ETACS-ECU: ON
B2102
• Status of ignition switch: ON position
• Ignition switch position information from the
ETACS-ECU: OFF
.
TROUBLESHOOTING HINTS
• Malfunction of CAN bus line
• Malfunction of the WCM
• Malfunction of the ignition switch
• Damaged wiring harness and connectors
• Malfunction of ETACS-ECU
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,
).
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
DIAGNOSIS
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WIRELESS CONTROL MODULE (WCM)
42C-32
STEP 2. Check ETACS-ECU connector C-317 and WCM
connector C-07 for loose, corroded or damaged terminals,
or terminals pushed back in the connector.
Q: Is ETACS-ECU connector C-317 and WCM connector
C-07 in good condition?
YES : Go to Step 3.
NO : Repair the defective connector.
STEP 3. Check the wiring harness between WCM
connector C-07 (terminal No.9) and the ETACS-ECU
connector C-317 (terminal No.5) for open circuit.
(1) Disconnect WCM connector C-07 and ETACS-ECU
connector C-317, and check the wiring harness.
(2) Check the wiring harness between WCM connector C-07
(terminal No.9) and ETACS-ECU connector C-317 (terminal
No.5)
OK: Continuity exists (2
Ω or less)
Q: Is the wiring harness between WCM connector C-07
(terminal No.9) and the ETACS-ECU connector C-317
(terminal No.5) in good condition?
YES : Go to Step 4.
NO : Repair the wiring harness between WCM connector
C-07 (terminal No.9) and ETACS-ECU connector
C-317 (terminal No.5).
STEP 4. Using scan tool MB991958, check data list.
Use the ETACS-ECU data list to check the signals related to
the ignition voltage.
(1) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
Q: Does scan tool MB991958 display the item "IG voltage"
as normal condition?
YES : Go to Step 5.
NO : Diagnose the ETACS-ECU (Refer to GROUP 54A
−
ETACS, Diagnosis
).
AC709707
AC709707EP
Harness side: C-07
Harness side: C-317
Item No.
Item name
Normal
condition
Item 254
IG voltage
Battery
voltage
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