Mitsubishi Evolution X. Manual - part 1014

MMCS

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CHASSIS ELECTRICAL

54A-417

STEP 1. Check the multivision display operation.
Q: Check the sources from which the sound is not output.

No sound only from radio : Perform Inspection Procedure 

6 "Poor Reception." (Refer to 

P.54A-437

.)

No sound only when the CD is played : Perform 

Inspection Procedure 8 "No CD (compact disk)/DVD 
(Video Disk) cannot be Played." (Refer to 

P.54A-439

.) 

No sound only when the DVD is played : Perform 

Inspection Procedure 8 "No CD (compact disk)/DVD 
(Video Disk) cannot be Played."(Refer to 

P.54A-439

.) 

or Inspection Procedure 9 "Image of a DVD (Video 
Disk) is Played, but no Sound is Played." (Refer to 

P.54A-440

.)

No sound only when the music server is used : Go to 

Step 8.

No sound from any of the sources : Go to Step 2.

STEP 2. Check the ETACS-ECU coding data.
Use scan tool MB991958 to diagnose the CAN bus lines.

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-382

."

(2) Turn the ignition switch to "ON" position.
(3) Operate the scan tool MB991958 to read the ETACS-ECU 

option coding information (Refer to GROUP 00, Coding 
Table 

P.00-39

).

(4) Check that the "Speaker" is set to "Premium."
Q: Is the check result normal?

YES : Go to Step 3.
NO :  Operate scan tool MB991958 to set the option coding 

"Speaker" to "Premium," and check the trouble 
symptom.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

MMCS

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CHASSIS ELECTRICAL

54A-418

STEP 3. Check the MMCS service mode, CAN 
communication confirmation, and coding data.
(1) Display the CAN Communication Confirmation and Coding 

Data of the MMCS service mode. (Refer to 

P.54A-369

)

(2) Check if PREMIUM is displayed.
Q: Is the check result normal?

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

STEP 4. Check the service data log for the MMCS service 
mode.
With the service data log of MMCS service mode displayed, 
check if the service data log for SP (speaker) is displayed. 
(Refer to 

P.54A-369

)

Q: Is the service data log for SP (speaker) displayed?

YES : Go to Step 5.
NO :  Go to Step 8.

STEP 5. Using scan tool MB991958, diagnose the CAN bus 
line.
Use scan tool MB991958 to diagnose the CAN bus lines.
(1) Turn the ignition switch to "ON" position.
(2) Diagnose the CAN bus line.
Q: Is the check result normal?

YES : Go to Step 6.
NO :  Repair the CAN bus line.

STEP 6. Using scan tool MB991958, read the CAN box unit 
diagnostic trouble code. 
Check again if the DTC is set to the CAN box unit.
Q: Is the DTC set?

YES : Troubleshoot the MMCS (Refer to 

P.54A-384

).

NO :  Go to Step 7.

STEP 7. Using scan tool MB991958, read the ETACS-ECU 
diagnostic trouble code.
Check if the diagnostic trouble code is set to the ETACS-ECU.
Q: Is the DTC set?

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

− 

ETACS-ECU 

− Troubleshooting 

P.54A-582

).

NO :  Go to Step 8.

MMCS

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CHASSIS ELECTRICAL

54A-419

STEP 8. Check the service data log for the MMCS service 
mode.
(1) Display the service data log for the MMCS service mode. 

(Refer to 

P.54A-369

)

(2) Check if the service data log for drive and HDD is displayed.
Q: Is the service data log displayed?

YES (The service data log for drive is displayed.) : 

Perform Inspection Procedure 8 "No CD (compact 
disk)/DVD (Video Disk) cannot be Played."(Refer to 

P.54A-439

.) or Inspection Procedure 9 "Image of a 

DVD (Video Disk) is Played, but no Sound is Played." 
(Refer to 

P.54A-440

.) Go to Step 9.

YES (The service data log for HDD is displayed.) : 

Abnormalities relating to high or low temperature may 
be present. Check if the multivision display can output 
the sound at the operable temperature. If it cannot 
output the sound, go to Step 9.

YES (The service data log for AMP is displayed.) : Go to 

Step 9.

NO :  Go to Step 9.

STEP 9. Perform "Network/Connect Line Check" in the 
MMCS service mode.
(1) Display "Network/Connect Line Check" in the MMCS 

service mode. (Refer to 

P.54A-369

)

(2) Check if "DVD Drive OK" is displayed.
(3) Check if "HDD Drive OK" is displayed.
(4) Check if "Premium Audio OK" is displayed.
Q: Is the check result normal?

YES : Go to Step 17.
NO :  Go to Step 10.

STEP 10. Check audio amplifier connector D-29 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is audio amplifier connector D-29 in good condition?

YES : Go to Step 11.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

.

MMCS

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CHASSIS ELECTRICAL

54A-420

STEP 11. Check the power supply circuit to the audio 
amplifier. Measure the voltage at audio amplifier connector 
D-29.
(1) Disconnect audio amplifier connector D-29, and measure 

the voltage available at the wiring harness-side connector.

(2) Measure the voltage between terminal 25 and ground.

OK:Battery voltage.

(3) Measure the voltage between terminal 35 and ground.

OK:Battery voltage.

(4) Measure the voltage between terminal 36 and ground.

OK:Battery voltage.

Q: Is the measured voltage battery voltage?

YES : Go to Step 13.
NO :  Go to Step 12.

AC709325 AE

Harness side: D-29

AC709325 AF

Harness side: D-29

AC709325 AG

Harness side: D-29