Mitsubishi Lancer (4A9 engine). Manual - part 188

 

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Mitsubishi Lancer (4A9 engine). Manual - part 188

 

 

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-414

YES : 

This diagnosis is complete.

NO : 

Go to Step 9.

STEP 9. Temporarily replace the multivision 
display, and check the trouble symptom.
After temporary replacement of the multivision dis-
play, check that the new DVD is played normally 
when it is inserted.

Q: Is the check result normal?

YES : 

Replace the multivision display.

NO : 

Replace the DVD.

Inspection Procedure 10: Sound of a DVD can be played, but no image is played.

CAUTION

Whenever the multivision display is replaced, 
ensure that the power supply circuit and the 
earthing circuit are normal. (Check that the volt-
age is 10 V or more.)
COMMENTS ON TROUBLE SYMPTOM
The DVD or the multivision display may be defective.

PROBABLE CAUSES

• Defective DVD

• Malfunctions of multivision display

DIAGNOSIS PROCEDURE

STEP 1. Check if the error message is displayed 
on the monitor.
(Refer to .)

Q: Is the error message displayed on the monitor?

YES  : 

Refer to error massage (refer to ), take 

necessary steps. If the DVD is still not be 
played, go to Step 2.

NO : 

Go to Step 2.

STEP 2. Check the DVD.
Check that the DVD is free of dirt or scratch.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Clean the disc, use a disc without scratches 
and burrs, or remove the burrs from the 
disc, and then reinsert the disc.

STEP 3. Temporarily replace the DVD with 
another DVD, and check the trouble symptom.
Check if another DVD is played normally when it is 
inserted.

Q: Is the check result normal?

YES : 

Replace the used DVD.

NO : 

Go to Step 4.

STEP 4. Check the service data log for the MMCS 
service mode.
(1) Display the service data log for the MMCS 

service mode. (Refer to .)

(2) Check that the service data log for drive is 

displayed.

(3) Check that the service data log for monitor is 

displayed.

(4) Check that the service data log for HDD is 

displayed.

Q: Is the error log displayed?

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

Check for foreign materials or condensation. 
Repair if there is an abnormality, and then 
go to Step 5.

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

Abnormalities relating to high or low 

temperature may be present. Check if the 
DVD image is displayed on the monitor 
within the temperature range where the 
navigation and menu screens can be 
displayed. If the image is not displayed, go 
to Step 5.

NO : 

Go to Step 5.

STEP 5. Perform "Network/Connect Line Check" 
in the MMCS service mode.
(1) Display "Network/Connect Line Check" in the 

MMCS service mode. (Refer to .)

(2) Check if "DVD Drive OK" is displayed.
(3) Check if "HDD Drive OK" is displayed.

Q: Is the check result normal?

YES  : 

Go to Step 6.

NO  : 

Replace the multivision display.

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-415

STEP 6. Temporarily replace the multivision 
display, and check the trouble symptom.
After temporary replacement of the multivision dis-
play, check if the DVD image is displayed.

Q: Is the check result normal?

YES : 

Replace the multivision display.

NO : 

Replace the DVD.

Inspection Procedure 11: The picture and sound of audio and video adapter’s input are not played.

CAUTION

Whenever the multivision display is replaced, ensure that the power supply circuit and the earthing 
circuit are normal. (Check that the voltage is 10 V or more.)

COMMENTS ON TROUBLE SYMPTOM
The wiring harness between the audio and video 
adapter and the multivision display, the audio and 
video adapter or the multivision display may have a 
problem.
NOTE: The connected equipment side or the con-
nection from the audio and video adapter to the 
equipment may have a problem. Therefore, check 
that the operation status and the connecting method 
of the equipment connected to the multivision display 
and audio and video adapter before performing the 
diagnosis.

PROBABLE CAUSES

• The multivision display may be defective

• The audio and video adaptor may be defective

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check of DVD picture
Check that the DVD picture is displayed normally.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Perform the troubleshooting related to the 
MMCS (Refer to ).

STEP 2. Check the audio and video adapter.
Check the audio and video adapter.(Refer to )

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the audio and video adapter.

STEP 3. Connector check: C-142 multivision 
display connector, C-120 audio and video 
adaptor connector

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the connector concerned.

STEP 4. Check the wiring harness between C-142 
multivision display connector terminal No. 47, 63, 
48, 64, 49 and C-120 audio and video adaptor 
connector terminal No. 1, 2, 6, 4, 5.

• Check the communication lines for open circuit or 

short circuit.

NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-133, C-140, and repair if 
necessary.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the wiring harness.

AC701094

Connectors: C-120, C-142 <LHD>

BK

C-120

C-142 (GR)

AC701122 CN

Connectors:  C-120, C-142 <RHD>

C-120

C-142 (GR)

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-416

STEP 5. Temporarily replace the multivision 
display, and check the trouble symptom.
Check that the external input is normal.

Q: Is the check result normal?

YES : 

Replace the multivision display.

NO : 

Replace the audio and video adapter.

Inspection Procedure 12: Check the CAN box unit power supply circuit. <Vehicles for RUSSIA>

CAUTION

Before replacing the CAN box unit, ensure that the power supply circuit, the earth circuit, and the 
communication circuit are normal. (Check that the voltage is 10 V or more.)

COMMENTS ON TROUBLE SYMPTOM
If the CAN box unit functions do not work at all, the 
CAN box unit power supply system, body earth sys-
tem, or CAN box unit may have a problem.
NOTE: From the fusible link to C-139 intermediate 
connector, the CAN box unit uses the same power 
supply circuit as that of multivision display. There-
fore, check first if the multivision display operates 
normally. If the multivision display does not operate 
normally, carry out in advance the troubleshooting of 
"No navigation screen is displayed". (Refer to  <Vehi-
cles without Auto Stop & Go (AS&G) System).

PROBABLE CAUSES

• Damaged harness wires and connectors

• Malfunction of CAN box unit

• Malfunction of DC/DC converter

DIAGNOSIS PROCEDURE

STEP 1. Check the multivision display
Check if the multivision display power is turned ON.

Q: Is the check result normal?

YES : 

Go to Step 2

NO : 

Perform Inspection Procedure 1 "No 
navigation screen is displayed."(Refer to  
<Vehicles without Auto Stop & Go (AS&G) 
System>.)

ACA00892

Connectors: C-54, C-65 <LHD>

AH

C-65 (GR)

C-54

ACA00895AG

Connector: C-54, C-65 <RHD>

C-65 (GR)

C-54

ACA00887

AT

Connectors: C-307, C-309, C-311, C-313
 <RHD> 

C-309 (B)

C-307 (B)

ETACS-ECU

C-313 (BR)

C-311

ACA00886

AT

Connectors: C-307, C-309, C-311, C-313
 <LHD>

ETACS-ECU

C-311

C-313 (BR)

C-307 (B)

C-309 (B)

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-417

STEP 2. Connector check: C-54 CAN box unit 
connector and C-139 intermediate connector

Q: Is the check result normal?

YES : 

Go to Step 3

NO : 

Repair or replace the damaged 
component(s).

STEP 3. Resistance measurement at C-54 CAN 
box unit connector.
(1) Disconnect C-54 CAN box unit connector and 

measure the resistance available at the wiring 
harness side of the connector.

(2) Check the continuity between C-54 CAN box unit 

connector terminal No.1 and body earth.

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 5

NO : 

Go to Step 4

STEP 4. Check the wiring harness between C-54 
CAN box unit connector terminal No.1 and body 
earth.

• Check the earth wires for open circuit.

Q: Is the check result normal?

YES : 

No action is necessary and testing is 

complete.

NO : 

Repair the wiring harness.

STEP 5. Voltage measurement at C-54 CAN box 
unit connector
(1) Disconnect C-54 CAN box unit connector and 

measure the voltage available at the wiring 
harness side of the connector.

(2) Measure the voltage between C-54 CAN box unit 

connector terminal No.2 and body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 7

NO : 

Go to Step 6

STEP 6. Check the wiring harness between C-54 
CAN box unit connector terminal No.2 and C-139 
intermediate connector terminal No.10.

• Check the power supply lines (battery power sup-

ply) for open circuit and short circuit.

Q: Is the check result 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 ).

NO : 

Repair the wiring harness.

STEP 7. Voltage measurement at C-54 CAN box 
unit connector
(1) Disconnect C-54 CAN box unit connector and 

measure the voltage available at the wiring 
harness side of the connector.

(2) Ignition switch "ACC".
(3) Measure the voltage between C-54 CAN box unit 

connector terminal No.10 and body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Replace the CAN box unit.

NO : 

Go to Step 8

STEP 8. Check the wiring harness between C-54 
CAN box unit connector terminal No.10 and C-
139 intermediate connector terminal No.1.

• Check the power supply lines (battery power sup-

ply) for open circuit and short circuit.

Q: Is the check result 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 ).

NO : 

Repair the wiring harness.

 

 

 

 

 

 

 

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