Mitsubishi Evolution X. Manual — part 1018

MMCS

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CHASSIS ELECTRICAL

54A-433

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827 M.U.T.-III USB Cable

• MB991910 M.U.T.-III Main Harness A

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 normal (Refer to

P.54A-369

).

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

P.54A-59

).

STEP 3. Check combination meter connector C-04 and
multivision display connector C-13 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
Q: Is combination meter connector C-04 and multivision

display connector C-13 in good condition?
YES : Go to Step 4.
NO : Repair or replace the damaged component (Refer to

GROUP 00E, Harness Connector Inspection

P.00E-2

).

STEP 4. Check the wiring harness between combination
meter connector C-04 (terminal 20) and multivision display
connector C-13 (terminal 13).

• Check the communication lines for open circuit and short

circuit..

NOTE: Also check intermediate connector C-108 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector C-108 is damaged, repair
or replace the connector as described in GROUP 00E, Harness
Connector Inspection

P.00E-2

.

Q: Is the wiring harness between combination meter

connector C-04 (terminal 20) and multivision display
connector C-13 (terminal 13) in good condition?
YES : Go to Step 5.
NO : The wiring harness may be damaged or the

connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary.

MMCS

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CHASSIS ELECTRICAL

54A-434

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.

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

CAUTION

Before replacing the ECU, ensure that the power supply circuit, the ground circuit, and the communi-
cation circuit are normal. (Check that the voltage is 10 V or more.)

.

Multivision Display Communication Circuit

COMBINATION
METER

INTERFACE
CIRCUIT

MULTIVISION
DISPLAY

AC708950

Connector: C-04

AR

AC708951BM

Connectors: C-13, C-108

C-13 (GR)

C-108

MMCS

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CHASSIS ELECTRICAL

54A-435

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.

.

PROBABLE CAUSES

• The GPS antenna may be defective

• The combination meter may be defective

• The multivision display may be defective

• Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

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

P.54A-369

.)

• Perform "Network/Connect Line Check" in the MMCS ser-

vice mode to check that the communication and wire con-
nection 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

P.54A-438

.) Then, go to Step

6.

STEP 3. Check the speedometer.
Check whether the speedometer works normally.
Q: Does the speedometer work normally?

YES : Go to Step 4.
NO : Diagnose the combination meter (Refer to

Combination meter

− Diagnosis

P.54A-59

).

MMCS

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CHASSIS ELECTRICAL

54A-436

STEP 4. Check combination meter connector C-04 and
multivision display connector C-13 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
Q: Is combination meter connector C-04 and multivision

display connector C-13 in good condition?
YES : Go to Step 5.
NO : Repair or replace the damaged component (Refer to

GROUP 00E, Harness Connector Inspection

P.00E-2

).

STEP 5. Check the wiring harness between combination
meter connector C-04 (terminal 20) and multivision display
connector C-13 (terminal 13).

• Check the communication lines for open circuit and short

circuit..

NOTE: Also check intermediate connector C-108 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector C-108 is damaged, repair
or replace the connector as described in GROUP 00E, Harness
Connector Inspection

P.00E-2

.

Q: Is the wiring harness between combination meter

connector C-04 (terminal 20) and multivision display
connector C-13 (terminal 13) in good condition?
YES : Go to Step 6.
NO : The wiring harness may be damaged or the

connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary.

STEP 6. Retest the system.
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

P.00-15

).

NO : Replace the multivision display.