Mitsubishi Evolution X. Manual — part 1019

MMCS

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CHASSIS ELECTRICAL

54A-437

Inspection Procedure 6: Poor reception.

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.)

.

COMMENTS ON TROUBLE SYMPTOM

In case of poor reception, the roof antenna (antenna
rod, antenna base), antenna feeder, or multivision
display may have a problem.
NOTE: The radio wave may not be received if the
vehicle is placed in the area which is exposed to a
special electric field. Thus, check that the radio
broadcasting can be received using the radio of
another vehicle before carrying out diagnosis.

.

PROBABLE CAUSES

• The roof antenna (antenna rod, antenna base)

may be defective

• The antenna feeder may be defective

• The multivision display may be defective

• Damaged harness wires and connectors

DIAGNOSIS

STEP 1. Check the state of the roof antenna.

Q: Is the roof antenna assembled?

YES :

Go to Step 2.

NO :

Assemble the antenna. Check that a poor
reception is resolved.

STEP 2. Check to see if inspections are taking
place is an area exposed to special electric
fields.

Q: Are inspections taking place under special electric

field conditions (underground garage, inside a
building, etc.)?
YES :

Go to Step 3.

NO :

Go to Step 4.

STEP 3. Move the vehicle and check the radio.
Move the vehicle to a good reception area that is not
exposed to special electric fields.

Q: Is reception of the strongest radio frequency

possible within the area?
YES :

Check that a poor reception is resolved.

NO :

Go to Step 4.

STEP 4. Tune the radio, and then check it.

Q: Did the sensitivity improve after tuning?

YES :

Check that a poor reception is resolved.

NO :

Go to Step 5.

STEP 5. Check with several broadcasting
stations.
NOTE: Two types of noise are addressed in this pro-
cedure, multipath and fading noise. The frequency of
FM waves is extremely high. This makes them sus-
ceptible to effects from geological formations and
buildings. These effects disrupt the broadcast signal
and obstruct reception in many ways.

.

•

Multipath noise is the echo that occurs when the
broadcast signal is reflected by a large obstruc-
tion and enters the receiver with a slight time
delay relative to the direct signal (repetitious
buzzing).

•

A fading or buzzing noise may occur when the
broadcast beam is disrupted by obstructing
objects and the signal strength fluctuates within a
narrow range.

Q: Is the abnormality in reception generated only

within a certain range?
YES :

Check that a poor reception is resolved.

NO :

Go to Step 6.

STEP 6. Check the connection of the antenna
plug and multivision display.

Q: Is the antenna plug thoroughly connected to the

multivision display?
YES :

Go to Step 7.

NO :

Thoroughly connect the antenna plug and
the multivision display. Check that a poor
reception is resolved.

STEP 7. Check by replacing multivision display.

Q: Do the other multivision display work normally?

YES :

Either repair or replace the original

multivision display. Check that a poor
reception is resolved.

NO :

Either repair or replace the antenna
assembly. Check that a poor reception is
resolved.

MMCS

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CHASSIS ELECTRICAL

54A-438

Inspection Procedure 7: GPS signal can not be received.

CAUTION

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

.

COMMENTS ON TROUBLE SYMPTOM

The GPS antenna or the multivision display may be
defective.

.

PROBABLE CAUSES

• The GPS antenna may be defective

• The multivision display may be defective

DIAGNOSIS

STEP 1. Confirmation in MMCS service mode
Perform "Network/Connect Line Check" in the MMCS service
mode to check that the communication and wire connection
with the GPS antenna are OK. (Refer to

P.54A-369

.)

Q: Is the check result normal?

YES : Go to Step 2.
NO : Check that the GPS antenna is correctly connected to

the multivision display, and go to Step 3.

STEP 2. Check for the vehicle's current position.
Check that the vehicle is parked on a well-ventilated place.
Q: Is the vehicle parked on a well-ventilated place?

YES : Go to Step 3.
NO : Move the vehicle to a well-ventilated area.

STEP 3. Confirming GPS signal reception
(1) Start the multivision display.
(2) Press the [INFO] button.
(3) Select [Vehicle Position].
(4) Wait for 5 minutes, and then check whether GPS signal can

be received.

Q: Can GPS signal be received?

YES : The diagnosis is complete. (There is no failure)
NO : Go to Step 4.

STEP 4. Substitute a known good multivision display, and
check the trouble symptom.
(1) Temporarily replace the multivision display.
(2) Start the multivision display.
(3) Press the [INFO] button.
(4) Select [Vehicle Position].
(5) Check if the GPS signals are being received after 5 minutes

have elapsed.

Q: Is the check result normal?

YES : Replace the multivision display.
NO : Replace the GPS antenna.

MMCS

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CHASSIS ELECTRICAL

54A-439

Inspection Procedure 8: CD (compact disk)/DVD (Video Disk) cannot be played.

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.)

.

COMMENTS ON TROUBLE SYMPTOM

The CD (compact disk)/DVD (Video Disk) or the mul-
tivision display may be defective.

.

PROBABLE CAUSES

• Defective DVD (video disk)

• The multivision display may be defective

DIAGNOSIS

STEP 1. Check the CD (compact disk)/DVD (video
disk) insertion surface.
Check if the CD (compact disk)/DVD (video disk) is
inserted with its correct surface facing upward.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Confirm the disk face, and insert it again. (If
the disk is single-sided, its label should face
up)

STEP 2. Check the CD (compact disk)/DVD (video
disk).

• Check that the DVD (video disk) has the correct

region code.

• Check if the CD (compact disk) corresponds with

the multivision display.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Use the DVD (video disk) with a correct
region code. Or use the CD (compact disk)
which corresponds with the multivision
display.

STEP 3. Check the CD (compact disk)/DVD (video
disk).
Check that the CD (compact disk)/DVD (video disk)
is free of dirt or scratch.

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Clean the disk, use a disk without scratches
and burrs, or remove the burrs from the
disk. Then, reinsert the disk.

STEP 4. Temporarily replace the CD (compact
disk)/DVD (video disk) with another one, and
check the trouble symptom.
Check if another CD (compact disk)/DVD (video
disk) is played normally when it is inserted.

Q: Is the check result normal?

YES :

Replace the used CD (compact disk)/DVD

(video disk).

NO :

Go to Step 5.

STEP 5. Check the service data log for the MMCS
service mode.
(1) Display the service data log for the MMCS

service mode. (Refer to

P.54A-369

.)

(2) Check if the service data log for drive and HDD is

displayed.

Q: Is the service data 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 6.

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

Abnormalities relating to high or low
temperature may be present. Check if the
multivision display can be played at the
operable temperature. If it cannot be played,
go to Step 6.

NO :

Go to Step 6.

STEP 6. Perform "Network/Connect Line Check"
in the MMCS service mode.
(1) Display "Network/Connect Line Check" in the

MMCS service mode. (Refer to

P.54A-369

.)

(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 7.

NO :

Replace the multivision display.

STEP 7. Retest the system.
Check if the CD (compact disk)/DVD (video disk) is
played normally when it is inserted.

Q: Is the check result normal?

YES :

The diagnosis is complete.

NO :

Go to Step 8.

MMCS

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CHASSIS ELECTRICAL

54A-440

STEP 8. Temporarily replace the multivision
display, and check the trouble symptom.
After temporary replacement of the multivision dis-
play, check that the CD (compact disk)/DVD (video
disk) is played normally when it is inserted.

Q: Is the check result normal?

YES :

Replace the multivision display.

NO :

Replace the CD (compact disk)/DVD (video
disk).

Inspection Procedure 9: Image of a DVD (Video Disk) is played, but no sound is played.

CAUTION

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

.

COMMENTS ON TROUBLE SYMPTOM

The DVD (video disk) or the multivision display may
be defective.

.

PROBABLE CAUSES

• Defective DVD (video disk)

• The multivision display may be defective

DIAGNOSIS

STEP 1. Check whether other sounds are
emitted.
Check whether sound other than DVD (video disk) is
emitted.
(1) Check if the sound is output when the music

server is used.

(2) Check if the sound is output when the radio is

used.

(3) Check if the sound is output when a CD (compact

disk) is used.

Q: Is sound other than DVD (video disk) emitted?

YES :

Go to Step 2.

NO :

Diagnose the MMCS. (Refer to

P.54A-408

.)

STEP 2. Check a DVD (video disk) to be inserted.
Check if the sound is recorded in the DVD (video
disk), using other DVD players.

Q: Is sound data recorded in the DVD (video disk)?

YES :

Go to Step 3.

NO :

Use a DVD (video disk) containing sound
data.

STEP 3. Check the DVD (video disk).
Check that the DVD (video disk) is free of dirt or
scratch.

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Clean the disk, use a disk without scratches
and burrs, or remove the burrs from the
disk. Then, reinsert the disk.

STEP 4. Temporarily replace the DVD (video disk)
with another DVD, and check the trouble
symptom.
Check if the DVD (video disk) is played normally
when it is inserted.

Q: Is the check result normal?

YES :

Replace the used DVD (video disk).

NO :

Go to Step 5.

STEP 5. Check the service data log for the MMCS
service mode.
(1) Display the service data log for the MMCS

service mode. (Refer to

P.54A-369

.)

(2) Check if the service data log for drive and HDD is

displayed.

Q: Is the service data 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 6.

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

Abnormalities relating to high or low
temperature may be present. Check if the
multivision display can be played at the
operable temperature. If it cannot be played,
go to Step 6.

NO :

Go to Step 6.