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 

P.54C-14

).

.

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 

P.54C-9

). 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 

P.42C-114

). 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 

P.54C-14

).

.

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 

P.54C-240

). 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 

P.42C-114

). 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 

P.42C-114

). 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 

P.54C-14

).

.

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 

P.54C-14

). 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 

P.35C-20

).

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 

P.35C-20

). 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 

P.54A-582

).

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 

P.54A-582

). 

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 

P.42C-114

).

OK:

Acceleration value: 5G or less

Q: Is the check result OK?

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

P.42C-9

). Then go to Step 6.

NO :  Replace the TPMS transmitter and register ID codes 

(Refer to 

P.42C-9

). Then go to Step 6.

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.