2000 MITSUBISHI MONTERO Service Repair Manual

CHASSIS ELECTRICAL -Clock or Center Display54A-63
INSPECTION PROCEDURE 3
Abnormal vehicle speed is displayed on the service mode.

OK
NGRepair.
Measure at center display unit connec-
tor D-03.
DDisconnect the connector.
DVoltage between terminal 36 and
body earth.
OK:(Ignition switch: ON)
System voltage.
(Ignition switch: OFF)
0-1VNGCheck the wiring harness between the
center display unit and the junction
block, and repair if necessary.
NG
Check the wiring harness between the
center display unit and the engine-ECU,
and repair if necessary.
Select “Check of units connected into
the center display” on the service mode.
Does the symbol “MU” appear?YES NGDisconnect MUT-
II. Then check vehicle
wiring harnesses.Disconnect connector D-04.
Then check voltage at terminal 5 of that
connector.
DIgnition switch: ON
NG:More than 80% of system volt-
age
OK:Less than that
OK NO
OK
Check the connections between the
center display unit and the engine-ECU.OKReplace the center display unit.
Check the connector: D-04

Measure at center display unit connector D-03.
DDisconnect the connector.
DVoltage between terminal 36 and body earth.
OK:(Ignition switch: ON) System voltage.
(Ignition switch: OFF) 0 - 1 VNGCheck the wiring harness between the center display unit and
the junction block, and repair if necessary.
OK
Measure at center display unit connector D-03 .
DDisconnect the connector.
DVoltage between terminal 27 and body earth.
OK:HI: System voltage.
Lo: 0 - 1VNGCheck the wiring harness between the center display unit and
the vehicle speed sensor, and repair if necessary.
OK
Replace the center display unit.


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CHASSIS ELECTRICAL -Clock or Center Display54A-64
INSPECTION PROCEDURE 4
Abnormal driving data are displayed:
DAbnormal average fuel consumption (momentary fuel consumption) and average vehicle speed
DAbnormal cruising distance
Are the average fuel consumption and average vehicle speed dis-
play correctly?NOGo to inspection procedure 3.1.
YES
Does the vehicle information on displayed on the screen meet
with the actual vehicle?
Is the vehicle type (long or short body) recognized correctly?
(Select “Check of units connected into the center display” and
“Check of vehicle information” on the service mode.)NOReplace the center display unit.
YES
Is remained fuel amount displayed correctly on servicemode?YESEnd (no abnormality).
NO
Measure at center display unit connector D-03.
DDisconnect the connector.
DVoltage between terminal 33 and body earth.
OK:0.1 - 3 VNGCheck the wiring harness between center display unit and the
fuel gauge unit, and repair ifnecessary. (relevant units: Combination
meter, fuel gauge unit)
OK
Replace the center display unit.
NOTE
(1) If the remained fuel amount is so small that the fuel gauge unit can not detect a correct amount,
incorrect cruising range may be displayed.
(2) Fuel consumption is updated each time fuel is supplied. Furthermore, the cruising range depends
on road and driving conditions.
INSPECTION PROCEDURE 5
Clock runs fast or slow.
NGRepair the fuse and wiring harness.
OK
YES
Does it receive a radio station on differ-
ent region where has timelag?YESTurn off the CT function.
NO
Replace the center display unit.
Measure at center display unit connec-
tor D-03.
DIgnition switch: OFF
DVoltage between terminal 26 and
body earth.
OK:System voltage
Is the symbol “CT” displayed?
NO


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CHASSIS ELECTRICAL -Clock or Center Display54A-65
INSPECTION PROCEDURE 6
The display screen is dim.
NOMeasure at center display unit connec-
tor D-03.
DDisconnect the connector.
DVoltage between terminal 24 and
body earth.
OK:0 V (Lighting switch: off)
System voltage (Lighting
switch: ON)NGRepair the fuse and wiring harness.
Is the brightness of the center display
set correctly?NOAdjust the brightness of display on set-
ting mode.
OK
Replace the center display unit.
OK
Replace the center display unit.
YES
Measure at center display unit connec-
tor D-03.
DDisconnect the connector.
DRheostat: max
DVoltage between terminal 32 and
body earth.
OK:Low voltage (0 - 3 V)NGRepair the wiring harness.
Does the brightness of display change
when the lighting switch is on or off?
YES


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CHASSIS ELECTRICAL -Clock or Center Display54A-66
INSPECTION PROCEDURE 7
Air conditioning display is not available.
Measure at center display unit connec-
tor D-03.
DDisconnect the connector.
DVoltage between terminal 36 and
body earth.
OK:System voltage (Ignition
switch: ON)
0 - 1 V (Ignition switch:
OFF)NGCheck the wiring harness between the
center display unit and the junction
block, and repair if necessary.
OK
NO OK
Check theaudio unit.
NG
NG
Repair wiring harness.
OK
OK
Replace the center display unit.
YES
Replace the A/C-ECU.
YES
Refer to GROUP 55 - A/C troubleshoot-
ing.Check the reoccurrence of symptom.OKEND
NG
Replace the center display unit.
Measure at center display unit connec-
tor D-04.
DDisconnect the connector.
DVoltage between terminal 9 and
body earth.
DVoltage between terminal 10 and
body earth.
DVoltage between terminal 19 and
body earth.
OK:Hi:4–5V
Lo:0–1V
Check the the wiring harnesses:
DBetween the center display and
A/C-ECU D-04, D-49
DBetween the center display and
AUDIO D-04, D-49
Check the reoccurrence of symptom.Select “Check of units connected into
the center display” on the service mode.
Does the symbol “AU” appear?
MUT-
IISelf-Diag code
Is the diagnosis code for A/C set?NG
NO


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CHASSIS ELECTRICAL -Radio/Tape Player54A-68
RADIO/TAPE PLAYER
TROUBLESHOOTING
QUICK-REFERENCE TROUBLESHOOTING CHART
ItemsProblem symptomRelevant chart
NoiseNoise appears at certain places when travelling.A-1
Mixed with noise, only at night.A-2
Broadcasts can be heard but UKW/MW/LW has a lot of noise.A-3
There is noise when starting the engine.A-4
Some noise appears when there is vibration or shocks during
travelling.A-5
Ever-present noise.A-6
RadioWhen switch is set to ON, no power is available.B-1
No sound from one speaker.B-2
There is noise but no reception for UKW/MW/LW or no sound from
UKW/MW/LW.B-3
Insufficient sensitivity.B-4
Distortion on UKW/MW/LW.B-5
Too few automatic select stations.B-6
Insufficient memory (preset stations are erased).B-7
Tape playerCassette tape will not be inserted.C-1
No sound.C-2
No sound from one speaker.C-3
Sound quality is poor, or sound is weak.C-4
Cassette tape will not be ejected.C-5
Uneven revolution. Tape speed is fast or slow.C-6
Faulty auto reverse.C-7
Tape gets caught in mechanism.C-8


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CHASSIS ELECTRICAL -Radio/Tape Player54A-69
CHART
A. NOISE
A-1 Noise appears at certain places when travelling.
Is there a particular structure?NODo the following measures eliminate
the noise?
1. Change to a different station with
a strong signal to boost
resistance to interference.
2. Suppresshightones to reduce
noise.
3. Extend antenna completely.YESOK
YES
Find out the following information
from the user:
1. Place
2. Locality conditions (valley,
mountain, etc.)
3. Name and frequency of stations
affected by noiseNO
If due to vehicle noise:
It may not be possible to prevent
noise if the signal is weak.
If there is more noise than other radios, find out the
noise conditions and thename andfrequency of the
receiving stations from the user, and consult with the
service centre.
If due to external noise:
In almost all cases, prevention on
the receiver side is impossible.
Weak signals especially are suscep-
tible to interference.


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CHASSIS ELECTRICAL -Radio/Tape Player54A-70
A-2 Mixed with noise, only at night.
The following factors can be considered as possible
causes of noise appearing at night.
1. Factors due to signal conditions: Due to the
fact that long-distance signals are more easily
received at night, even stations that are
received without problem during the day may
experience interference in a general worsening
of reception conditions. The weaker a station
is the more susceptible it is to interference,and a change to a different station or the
appearance of a beating sound* may occur.
Beat sound*: Two signals close in frequency
interfere with each other, creating a repetitious
high-pitched sound. This sound is generated
not only by sound signals but by electrical
waves as well.
2. Factors due to vehicle noise: Alternator noise
may be a cause.
Is the noise still obvious even with
the lamps OFF?NO
YES
Do the following measures eliminate
the noise?
DTune to a station with a strong
signal.
DTune to a station with a strong
signal without completely
extending the antenna.YESOK
NO
Does the noise fade away when the
vehicle harness is moved away from
the radio chassis? (if the harness is
not in the proper position.)YESOK
NO
If there is more noise than other radios, consult a
service centre.


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