Mitsubishi Lancer (4A9 engine). Manual - part 185

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-402

DIAGNOSIS PROCEDURE

STEP 1. Perform "Vehicle Signal Check" in the 
MMCS service mode.
Perform "Vehicle Signal Check" in the MMCS service 
mode to check whether vehicle speed signal is nor-
mal (Refer to ).

Q: Is the vehicle speed signal transmitted normally?

YES : 

Replace the multivision display.

NO : 

Go to Step 2.

STEP 2. Check the speedometer.
Check whether the speedometer works normally.

Q: Does the speedometer work normally?

YES : 

Go to Step 3.

NO : 

Diagnose the combination meter (Refer to 
Combination meter 

− Troubleshooting ).

STEP 3. Connector check: C-01 combination 
meter connector, C-144 multivision display 
connector

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the defective connector.

STEP 4. Check the wire harness between C-01 
combination meter connector terminal No.20 and 
C-144 multivision display connector terminal 
No.13.

• Check the communication line for open circuit or 

short circuit.

NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-139, and repair if neces-
sary.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the wiring harness.

STEP 5. Substitute a known good multivision 
display, and check the trouble symptom.
Check that no menus are active during driving.

Q: Is the check result normal?

YES : 

Replace the multivision display.

NO : 

Replace the combination meter.

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-403

Inspection Procedure 5: The screen is not normal in the navigation mode. (The own vehicle mark is 
dislocated.) <Except vehicles for RUSSIA>

CAUTION

Before replacing the multivision display, 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
There is a failure in the wiring harness between the 
combination meter and the multivision display, the 
GPS antenna, the respective connector(s), the com-
bination meter or the multivision display.
NOTE: If the vehicle speed signal has a problem, the 
speedometer of combination meter will be affected. 
Confirm if the speedometer of combination meter 
works normally at the abnormal state to customers.

PROBABLE CAUSES

• Malfunctions of GPS antenna

Multivision Display Communication Circuit

COMBINATION 
METER

INTERFACE 
CIRCUIT

MULTIVISION 
DISPLAY

Wire colour code 
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue 
BR : Brown     O : Orange     GR : Grey     R : Red     P : Pink     V : Violet     PU : Purple     SI : Silver

AC701093 BM

Connector: C-01 <LHD>

AC701122 CM

Connectors: C-01, C-144 <RHD>

C-01

C-144 (GR)

AC701094

Connector: C-144 <LHD>

BJ

C-144 (GR)

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-404

• Malfunctions of combination meter

• Malfunctions of multivision display

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Confirmation in MMCS service mode
Check the items below in the MMCS service mode 
(Refer to ).

•  Perform "Network/Connect Line Check" in the 

MMCS service mode to check that the communi-
cation and wire connection with the GPS are in 
good condition.

•  Perform "Vehicle Signal Check", and then check 

the status of the vehicle speed signal. 

•  Perform "Sensor Check", and then check the 

status of the vehicle speed sensor and the gyro 
sensor.

Q: Is the check result normal?

YES (OK for all) : 

Go to Step 6.

NO <GPS is not OK> : 

Go to Step 2.

NO <The vehicle speed sensor is not OK, or vehicle 
speed pulse does not increase after starting from a 
standstill> : 

Go to Step 3.

NO <Gyro sensor is not OK> : 

Go to Step 6.

STEP 2. GPS reception check
(1) Start the multivision display.
(2) Press the [INFO] button.
(3) Select [Vehicle Position].
(4) Check if the GPS signals are received.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Perform Inspection Procedure 7 "GPS 
signal cannot be received" (Refer to .), and 
then go to Step 6.

STEP 3. Check the speed meter.
Check whether the speed meter works normally. 
(Refer to .)

Q: Does the speedometer work normally?

YES : 

Go to Step 4.

NO : 

Diagnose the combination meter (Refer to 
Combination meter 

− Troubleshooting ).

STEP 4. Connector check: C-01 combination 
meter connector, C-144 multivision display 
connector

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the defective connector.

STEP 5. Check the harness wire between C-01 
combination meter connector terminal No.20 and 
C-144 multivision display connector terminal 
No.13.

• Check the signal line for open circuit or short cir-

cuit.

NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-139, and repair if neces-
sary.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the wiring harness.

STEP 6. Check of the troubles
Drive the vehicle for some time with the GPS signals 
being received, and check if the own vehicle mark is 
dislocated.

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 : 

Replace the multivision display.

MITSUBISHI MULTI COMMUNICATION SYSTEM (MMCS)

CHASSIS ELECTRICAL

54A-405

Inspection Procedure 5: The screen is not normal in the navigation mode. (The own vehicle mark is 
dislocated.) <Vehicles for RUSSIA>

CAUTION

Before replacing the multivision display, 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
There is a failure in the wiring harness between the 
combination meter and the multivision display, the 
GPS antenna, the respective connector(s), the com-
bination meter or the multivision display.
NOTE: If the vehicle speed signal has a problem, the 
speedometer of combination meter will be affected. 
Confirm if the speedometer of combination meter 
works normally at the abnormal state to customers.

PROBABLE CAUSES

• Malfunctions of GPS antenna

• Malfunctions of combination meter

• Malfunctions of multivision display

• Damaged harness wires and connectors

Multivision Display Communication Circuit

COMBINATION 
METER

INTERFACE 
CIRCUIT

MULTIVISION 
DISPLAY

Wire colour code 
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue 
BR : Brown     O : Orange     GR : Grey     R : Red     P : Pink     V : Violet     PU : Purple     SI : Silver

AC701093 BM

Connector: C-01 <LHD>

AC701094

Connector: C-144 <LHD>

BJ

C-144 (GR)