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.