Mitsubishi Evolution X. Manual - part 1016

MMCS

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CHASSIS ELECTRICAL

54A-425

AUDIO AMPLIFIER

MULTIVISION DISPLAY

AC708951BO

C-116

C-23

Connectors: C-13, C-23, C-24, C-108, C-116, 
C-117

C-108

C-117 (BR)

C-24

C-13 (GR)

AC708950BH

Connectors: C-128, C-129

 

C-128

C-129 (BR)

AC708954 AS

Connectors: D-01, D-29, D-30

D-30

D-29

D-01

AC708955AV

Connectors: D-16, D-24

D-16

D-24

MMCS

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CHASSIS ELECTRICAL

54A-426

.

COMMENTS ON TROUBLE SYMPTOM

If the sound is not heard from one of the speakers, 
the speaker, multivision display, audio amplifier, com-
munication line from the multivision display to the 
audio amplifier, or communication line from the audio 
amplifier to the speaker may have a problem. Also, 
the option coding information may be inconsistent.

.

PROBABLE CAUSES

• The speaker may be defective

• The multivision display may be defective

• The audio amplifier may be defective

• Option coding information inconsistency

• Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

• 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

AC608167 AB

Connectors: E-02, E-13

E-02 (B)

E-13

AC608168 AJ

Connectors: E-04, E-11

E-04 (B)

E-11

AC608170 AI

Connector: E-22

AC608169AH

Connector: E-23

AC708970AP

Connector: F-26

F-26 (B)

MMCS

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CHASSIS ELECTRICAL

54A-427

STEP 1. 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 2.
NO :  Operate scan tool MB991958 to set the option coding 

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

STEP 2. 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 3.
NO :  Go to Step 4.

STEP 3. 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 4.
NO :  Go to Step 7.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

MMCS

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CHASSIS ELECTRICAL

54A-428

STEP 4. 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 5.
NO :  Repair the CAN bus line.

STEP 5. 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 6.

STEP 6. 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 7.

STEP 7. Checking with audio speaker check
Perform the audio speaker check, and check which speaker 
does not output the sound (Refer to 

P.54A-369

).

NOTE: In the following procedure, check the speaker, tweeter 
or subwoofer that is abnormal.
Q: Is the check result normal?

YES (normal for all) : The trouble can be an intermittent 

malfunction (Refer to GROUP 00, How to Cope with 
Intermittent Malfunction 

P.00-15

).

NO (Either a speaker, a tweeter or a subwoofer is 
abnormal) : Go to Step 8.

STEP 8. Check door speaker connector E-13 <front-LH>, 
E-11 <front-RH>, E-23 <rear-LH> or E-22 <rear-RH>, or 
tweeter connector E-02 <LH> or E-04 <RH>, or subwoofer 
connector F-26 for loose, corroded or damaged terminals, 
or terminals pushed back in the connector.
Q: Is door speaker connector E-13 <front-LH>, E-11 

<front-RH>, E-23 <rear-LH> or E-22 <rear-RH>, or 
tweeter connector E-02 <LH> or E-04 <RH>, or 
subwoofer connector F-26 in good condition?
YES : Go to Step 9.
NO :  Repair or replace the damaged component (Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

).