Mitsubishi Evolution X. Manual — part 607
DIAGNOSIS
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WIRELESS CONTROL MODULE (WCM)
42C-45
DTC C1608: EEPROM Error
CAUTION
If there is any problem in the CAN bus lines, an incorrect
diagnostic trouble code may be set. Prior to this diagno-
sis, diagnose the CAN bus lines (Refer to GROUP 54C,
Trouble code diagnosis
.
DTC SET CONDITION
WCM incorporates EEPROM (nonvolatile memory), and that
EEPROM stores the TPMS, WCM and immobilizer information.
When the data in EEPROM is failed, this code is set.
.
TROUBLESHOOTING HINTS
The most likely causes for this DTC to set are:
• Damaged wiring harness and connector
• 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
STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP 54C
−
CAN Bus Diagnostics table
). On completion,
go to Step 2.
STEP 2. Diagnostic trouble code check
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC C1608 set?
YES : Replace the WCM and register the ID codes (Refer to
). Then go to Step 3.
NO : The procedure is complete.
STEP 3. Diagnostic trouble code check
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC C1608 set?
YES : Start over at Step 1.
NO : The procedure is complete.
DIAGNOSIS
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WIRELESS CONTROL MODULE (WCM)
42C-46
DTC C1900: No Registration
CAUTION
If there is any problem in the CAN bus lines, an incorrect
diagnostic trouble code may be set. Prior to this diagno-
sis, diagnose the CAN bus lines (Refer to GROUP 54C,
Trouble code diagnosis
.
DTC SET CONDITION
When the ID registration information of the TPMS transmitter is
not stored in the WCM, and/or when the WCM is replaced with
a new one, this code is set. If the ID registration mode is termi-
nated forcibly or time-out after one or more TPMS transmitters
are registered in the ID registration mode, the ID information in
the WCM is erased, and this diagnostic trouble code is set.
.
TROUBLESHOOTING HINTS
The most likely causes for this DTC to set are:
• Damaged wiring harness and connector
• Malfunction of TPMS transmitter
• Malfunction of WCM
• ID code registration failed.
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. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP 54C
−
CAN Bus Diagnostics table
). On
completion, go to Step 2.
STEP 2. Diagnostic trouble code check
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC C1900 set?
YES : Register the ID codes (Refer to
). Then go
to Step 3.
NO : The procedure is complete.
DIAGNOSIS
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WIRELESS CONTROL MODULE (WCM)
42C-47
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC C1900 reset?
YES : Replace the WCM and register the ID codes (Refer to
). Then start over at Step 1.
NO : The procedure is complete.
DTC C1901: Vehicle Speed Information Abnormality
CAUTION
If there is any problem in the CAN bus lines, an incorrect
diagnostic trouble code may be set. Prior to this diagno-
sis, diagnose the CAN bus lines (Refer to GROUP 54C,
Trouble code diagnosis
.
DTC SET CONDITION
WCM receives the wheel speed information from ASC-ECU via
the CAN-bus line. Although WCM receives the information that
the wheel is not currently rotated from ASC-ECU, if the TPMS
transmitter sends the information that the wheel is rotated, this
code is set.
.
TROUBLESHOOTING HINTS
The most likely causes for this DTC to set are:
• Damaged wiring harness and connector
• Malfunction of TPMS transmitter
• Malfunction of WCM
• Malfunction of ASC-ECU
• 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. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP 54C
−
CAN Bus Diagnostics table
). On
completion, go to Step 2.
DIAGNOSIS
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WIRELESS CONTROL MODULE (WCM)
42C-48
STEP 2. Diagnostic trouble code recheck after resetting
CAN bus lines
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC C1901 set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. Check for other diagnostic trouble code.
Check if the diagnostic trouble code is set from ASC-ECU
(Refer to GROUP 35C, diagnostic trouble code chart
).
Q: Is the check result normal?
YES : Go to Step 4.
NO : Carry out the troubleshooting for ASC-ECU (Refer to
GROUP 35C, diagnostic trouble code chart
). Then go to Step 6.
STEP 4. Check for other diagnostic trouble code.
Check if the diagnostic trouble code is set from ETACS-ECU
(Refer to GROUP 54A, ETACS
− diagnostic trouble code chart
).
Q: Is the check result normal?
YES : Go to Step 5.
NO : Troubleshoot the set DTC (Refer to GROUP 54A,
ETACS
− diagnostic trouble code chart
Then go to Step 6.
STEP 5. Check the TPMS transmitter acceleration.
Check the acceleration value of each TPMS transmitter by the
TPMS transmitter check function (Refer to
OK:
Acceleration value: 5G or less
Q: Is the check result OK?
YES : Replace the WCM and register ID codes (Refer to
NO : Replace the TPMS transmitter and register ID codes
(Refer to
STEP 6. Recheck for diagnostic trouble code.
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC C1901 set?
YES : Start over at Step 1.
NO : The procedure is complete.
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