Mitsubishi Evolution X. Manual - part 1061

ETACS

TSB Revision

CHASSIS ELECTRICAL

54A-605

STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set to the ETACS-ECU.
(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 the A/C-ECU.
NO :  The trouble can be an intermittent malfunction such 

as a poor connection or open circuit in the CAN bus 
lines between the A/C-ECU and the ETACS-ECU 
(Refer to GROUP 00, How to Cope with Intermittent 
Malfunction 

P.00-15

).

STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set to the ETACS-ECU.
(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 the ETACS-ECU.
NO :  The trouble can be an intermittent malfunction such 

as a poor connection or open circuit in the CAN bus 
lines between the A/C-ECU and the ETACS-ECU 
(Refer to GROUP 00, How to Cope with Intermittent 
Malfunction 

P.00-15

).

DTC U0168: WCM or KOS-ECU CAN timeout

CAUTION

• If DTC U0168 is set to the ETACS-ECU, always 

diagnose the CAN bus line.

• Before replacing the ECU, ensure that the 

communication circuit is normal.

.

TROUBLE JUDGMENT

If the signal from WCM or KOS-ECU cannot be 
received, the ETACS-ECU sets DTC U0168.

.

JUDGEMENT CRITERIA

After the following statuses continue to be true for 5 
seconds, if the communication with the WCM or 
KOS-ECU cannot be established for 0.6 second or 
more, the ETACS-ECU determines that a problem 
has occurred.

• No abnormality is present to the network.

• Ignition switch is in the ON position.

• No abnormality is present to the power supply 

fuse, or the odometer value is at 80.5 km (50.0 
miles) or more.

• ETACS-ECU system voltage is at 10−16 volts.

.

TROUBLESHOOTING HINTS

• The WCM may be defective.

• The KOS-ECU may be defective.

• The ETACS-ECU may be defective.

• The CAN bus may be defective.

ETACS

TSB Revision

CHASSIS ELECTRICAL

54A-606

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 (Vehicles with 

CAN communication system)

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.54A-579

."

(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 WCM or 
KOS-ECU diagnostic trouble code.
Check if DTC is set to the WCM or KOS-ECU.
Q: Is the DTC set?

YES : Troubleshoot the WCM or KOS (Refer to GROUP 

42B, Diagnosis 

P.42B-20

 <KOS> or GROUP 42C, 

Diagnosis 

P.42C-14

 <WCM>).

NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, read the diagnostic 
trouble code.
Check if the DTC U0168 is set to the combination meter.
Q: Is the DTC set?

YES : Go to Step 4.
NO :  Go to Step 5.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

ETACS

TSB Revision

CHASSIS ELECTRICAL

54A-607

STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set to the ETACS-ECU.
(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 the WCM or KOS-ECU.
NO :  The trouble can be an intermittent malfunction such 

as a poor connection or open circuit in the CAN bus 
lines between the WCM or KOS-ECU and the 
ETACS-ECU (Refer to GROUP 00, How to Cope with 
Intermittent Malfunction 

P.00-15

).

STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set to the ETACS-ECU.
(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 the ETACS-ECU.
NO :  The trouble can be an intermittent malfunction such 

as a poor connection or open circuit in the CAN bus 
lines between the WCM or KOS-ECU and the 
ETACS-ECU (Refer to GROUP 00, How to Cope with 
Intermittent Malfunction 

P.00-15

).

DTC U0184: Audio CAN timeout

CAUTION

• If DTC U0184 is set to the ETACS-ECU, always 

diagnose the CAN bus line.

• Before replacing the ECU, ensure that the 

communication circuit is normal.

.

TROUBLE JUDGEMENT

If the signal from radio and CD player or CD changer 
cannot be received, the ETACS-ECU sets DTC 
U0184.

.

JUDGEMENT CRITERIA

After the following statuses continue to be true for 5 
seconds, if the communication with the radio and CD 
player or CD changer cannot be established for 0.6 
second or more, the ETACS-ECU determines that a 
problem has occurred.

• No abnormality is present to the network.

• Ignition switch is in the ON position.

• No abnormality is present to the power supply 

fuse, or the odometer value is at 80.5 km (50.0 
miles) or more.

• ETACS-ECU system voltage is at 10−16 volts.

.

TROUBLESHOOTING HINTS

• The radio and CD player or CD changer may be 

defective.

• The ETACS-ECU may be defective.

• The CAN bus may be defective.

ETACS

TSB Revision

CHASSIS ELECTRICAL

54A-608

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 (Vehicles with 

CAN communication system)

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.54A-579

."

(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 audio 
diagnostic trouble code.
Check if DTC is set to the audio.
Q: Is the DTC set?

YES : Troubleshoot the audio (Refer to 

P.54A-288

).

NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, read the combination 
meter diagnostic trouble code.
Check if the DTC U0184 is set to the combination meter.
Q: Is the DTC set?

YES : Go to Step 4.
NO :  Go to Step 5.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB