Mitsubishi Evolution X. Manual - part 611

DIAGNOSIS

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WIRELESS CONTROL MODULE (WCM)

42C-61

DTC C1915: Transmitter OFF Mode 1

 

DTC C1925: Transmitter OFF Mode 2

 

DTC C1935: Transmitter OFF Mode 3

 

DTC C1945: Transmitter OFF Mode 4

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 TPMS transmitter(s) is in the OFF MODE, this code 
is set.

.

TROUBLESHOOTING HINTS

The most likely causes for this DTC to set are:

• OFF mode cancellation not performed

• Damaged wiring harness and connector

• Malfunction of TPMS transmitter

• 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 3.
NO :  Repair the CAN bus lines (Refer to GROUP 54C 

− 

CAN Bus Diagnostics table 

P.54C-14

). On 

completion, go to Step 2.

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 DTC C1915, C1925, C1935 or C1945 set?

YES : Go to Step 3.
NO :  The procedure is complete.

DIAGNOSIS

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WIRELESS CONTROL MODULE (WCM)

42C-62

STEP 3. Diagnostic trouble code check
(1) Drive the vehicle for five minutes.
(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Turn the ignition switch to the "ON" position.
(4) Check if the DTC is set.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are the all DTC C1915, C1925, C1935 and C1945 set?

YES : Replace the TPMS transmitters of all the four wheels, 

and register ID codes (Refer to 

P.42C-9

). Then go to 

Step 4.

NO :  Register the ID codes (Refer to 

P.42C-114

). Then go 

to Step 4.

STEP 4. Diagnostic trouble code recheck after register the 
ID codes
(1) Turn the ignition switch to the "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC C1915, C1925, C1935 or C1945 set?

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

P.42C-9

). Then start over at Step 1.

NO :  The procedure is complete.

DTC U0019: Bus off (CAN-B)

CAUTION

• If DTC U0019 is set, be sure to diagnose the 

CAN bus line.

• When replacing the ECU, always check that 

the communication circuit is normal.

.

DTC SET CONDITION

If the CAN-B circuit malfunctions, the WCM sets DTC 
U0019.

.

TECHNICAL DESCRIPTION(COMMENT)

If WCM cannot perform the data transmission in nor-
mal conditions due to a malfunction of the CAN-B 
bus circuit, WCM determines that there is a problem.

.

TROUBLESHOOTING HINT

The CAN bus line may be defective

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

DIAGNOSIS

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WIRELESS CONTROL MODULE (WCM)

42C-63

STEP 1.Recheck for diagnostic trouble code.
Check again if the DTC is set to the WCM.

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 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 : Go to Step 2.
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

).

STEP 2. Using scan tool MB991958, diagnose the CAN bus 
line.
(1) Turn the ignition switch to the "ON" position.
(2) Diagnose the CAN bus line.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : 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

).

NO :  Repair the CAN bus line (Refer to GROUP 54C, 

Diagnosis 

P.54C-14

).

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

DIAGNOSIS

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WIRELESS CONTROL MODULE (WCM)

42C-64

DTC U0141: ETACS-ECU CAN timeout

CAUTION

• If DTC U0141 is set, be sure to diagnose the 

CAN bus line.

• When replacing the ECU, always check that 

the communication circuit is normal.

.

DIAGNOSTIC FUNCTION

If the signal from ETACS-ECU cannot be received, 
the WCM sets DTC U0141.

.

TROUBLESHOOTING HINTS

• Malfunction of CAN bus line

• Malfunction of WCM

• 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 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

).

STEP 2. Using scan tool MB991958, read the ETACS-ECU 
diagnostic trouble code.
Check again if the DTC is set to the ETACS-ECU.
Q: Is the DTC set?

YES : Diagnose the ETACS-ECU (Refer to GROUP 54A 

− 

ETACS, Diagnose 

P.54A-582

).

NO :  Go to Step 3.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB