Mitsubishi Lancer (4A9 engine). Manual - part 171

 

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Mitsubishi Lancer (4A9 engine). Manual - part 171

 

 

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-346

Tool

Number

Name

Use

MB991955

a. MB991824
b. MB991827
c. MB991910
d. MB991911
e. MB991825
f. MB991826

M.U.T.-III sub-
assembly

a. Vehicle 

Communication 
Interface (V.C.I.)

b. M.U.T.-III USB 

cable

c. M.U.T.-III main 

harness A 
(Vehicles with CAN 
communication 
system)

d. M.U.T.-III main 

harness B 
(Vehicles without 
CAN 
communication 
system)

e. M.U.T.-III measure 

adapter

f. M.U.T.-III trigger 

harness

CAUTION

For vehicles with CAN 
communication, use M.U.T.-III 
main harness A to send 
simulated vehicle speed. If you 
connect M.U.T.-III main harness 
B instead, the CAN 
communication does not 
function correctly.
CAN bus diagnostics or service 
data check.

MB991223

a. MB991219
b. MB991220
c. MB991221
d. MB991222

Harness set

a. Check harness
b. LED harness
c. LED harness 

adapter

d. Probe

Continuity check and voltage 
measurement at harness wire or 
connector

a. For checking connector pin 

contact pressure

b. For checking power supply 

circuit

c. For checking power supply 

circuit

d. For connecting a locally 

sourced tester

MB991910

MB991826

MB991955

MB991911

MB991824

MB991827

MB991825

a

b

c

d

e

f

DO NOT USE

MB991223

a

d

c

b

DO NOT USE

BA

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-347

TROUBLESHOOTING

STANDARD FLOW OF DIAGNOSTIC 
TROUBLESHOOTING

M1544004800595

Refer to GROUP 00 

− Contents of troubleshooting .

DIAGNOSIS FUNCTION <VEHICLES FOR 
RUSSIA>

M1546001600554

HOW TO READ DIAGNOSIS CODE

GROUP 00 

− Diagnosis function .

HOW TO ERASE DIAGNOSIS CODE

GROUP 00 

− Diagnosis function .

CHECK OF FREEZE FRAME DATA

The freeze frame data can be checked by using 
M.U.T.-III.
When detecting fault and storing the diagnosis code, 
the ECU connected to CAN bus line obtains the data 
before the determination of the diagnosis code and 
the data when the diagnosis code is determined, and 
then stores the ECU status of that time. By analysing 
each data from M.U.T.-III, the troubleshooting can be 
performed more efficiently. The displayed items are 
as the table below.

Display item list

PRECAUTIONS ON SERVICING MMCS

M1546003000127

PRIOR TO DISCONNECTING THE VEHI-
CLE BATTERY

The MMCS stores a lot of information which your 
customer registers in its memory. All of this informa-
tion will be cleared when the battery terminals are 
disconnected. Therefore, the preset channels must 
be stored before the vehicle battery is disconnected. 
Vehicle's current position and destinations must be 
stored if the vehicle battery remains disconnected for 
long periods.

DIAGNOSIS TIPS CONCERNING THE 
ENTIRE SYSTEM

1. If at least two system functions are defective at 

the same time, it is possible that communication 
between the system components is abnormal. 
Check the system using the communication and 
wire connection check in the service mode.

2. If an error is displayed, check that relevant wiring 

harness connectors are engaged correctly. If a 
failure is found, repair the connectors and check 
the trouble symptom again.

3. If the wiring harness connectors are engaged 

correctly, check the wiring harness. If the wiring 
harness is in good condition, replace relevant 
component(s). Now the error code and the serv-
ice mode data must be stored.

NOTE: If a system communication related failure is 
suspected, diagnose the system.

MB992006

Extra fine probe

Continuity check and voltage 
measurement at harness wire or 
connector

Tool

Number

Name

Use

MB992006

Item No.

Item name

Data item

Unit

1

Odometer

Total driving distance after the diagnosis code is 
generated

km

2

Ignition cycle

Number of times the ignition switch is turned "ON" or 
"LOCK (OFF)" after the past failure transition

Number of 
counts is 
displayed.

4

Accumulated minute Cumulative time for current malfunction of diagnosis 

code

min

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-348

DIAGNOSIS TIPS CONCERNING THE 
NAVIGATION FUNCTION

1. The precision of the GPS positioning is limited 

due to its operation principles. So, some of cus-
tomer reports do not mean that the system is 
defective.

Prior to troubleshooting, interrogate your customer 

about how the navigation system is used and 
where he/she drives. If you determine that the 
system is OK, explain to your customer about 
how the system works and how the customer 
should operate it.

2. If the system is not OK, diagnose the system 

according to the trouble symptom chart.

ERROR MESSAGE

M1546023500287

When the multivision display detects its own uninten-
tional operation or malfunction in the loaded disc, it 
displays the following error messages.

AC804184

The unit too hot. Please wait...

AB

ERROR MESSAGE SAMPLE

<English>

<Russian>

Error contents

Cause

Action

Malfunction of 
multivision display 
by high temperature

The inside temperature of the 
multivision display is 75

°C or 

more.

Wait until the temperature drops to the operable 
temperature. After the temperature drops, the 
error message display is terminated, and then 
returns to the screen before the error message 
display.

AC804184

The unit too cold Please wait...

AC

ERROR MESSAGE SAMPLE

<English>

<Russian>

Error contents

Cause

Action

Malfunction of 
multivision display 
by low temperature

The inside temperature of the 
multivision display is 

−20°C or 

less.

Wait until the temperature rises to the operable 
temperature by working the air conditioner. After 
the temperature rises, the error message display 
is terminated, and the screen returns to the status 
before displaying the error message.

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-349

AC804210

 It is difficult to read the hard disk. Wait
for a while unit the hard disk is restored.

ERROR MESSAGE SAMPLE

<English>

<Russian>

 It is difficult to read the hard disk. Wait
for a while unit the hard disk is restored.

Soon,Restart...

AC

(1)

After HDD was checked automatically.

After HDD was checked automatically.

Error contents

Cause

Action

Malfunction of HDD 
by vibration

Severe vibration is applied to the 
multivision display, and the 
reading of the HDD data is 
prohibited.

When the multivision display confirms the HDD 
data reading availability, it restarts automatically. 
Check if the multivision display is securely 
installed to the vehicle body.

HDD Partition Error System malfunction occurs to the 

HDD inside the multivision display.

The multivision display checks HDD 
automatically. (1) is displayed after the 
completion of the check. Select (1) to restart the 
multivision display. If it does not restart, turn the 
ignition switch to the OFF position to turn off the 
power supply, and then turn the ignition switch to 
the ON position to restart. After the restart, check 
that the OK is displayed for the HDD Drive in the 
"Network/Connect Line Check" of the MMCS 
service mode. If not, replace the multivision 
display.

AC804184 AK

ERROR MESSAGE SAMPLE

<English>

<Russian>

Please check the disk.

 

 

 

 

 

 

 

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