ECU MITSUBISHI LANCER EVOLUTION IV 1998 Workshop Manual

CHASSIS ELECTRICAL – Combination MetersCHASSIS ELECTRICAL – Combination Meters54-27
ON-VEHICLE SERVICE
SPEEDOMETER CHECK
1. Adjust the pressure of the tyres to the specified level.
2. Set the vehicle onto a speedometer tester and use wheel
chocks to hold the rear wheels.
3. Pull the parking brake lever firmly.
4. To prevent the front wheel from moving from side to side,
attach tension bars to the tie-down hook, and secure
both ends to anchor plates.
5. To prevent the vehicles from starting, attach a chain or
wire to the rear towing hook, and secure the other end
of the chain or wire firmly to an unmovable body.
6. Check if the speedometer indication range is within the
standard values and if the pointer fluctuation is within
the limits.
Caution
Do not operate the clutch suddenly. Do not
increase/decrease speed rapidly while testing.
Standard values:
Vehicle speed km/hSpeedometer indication
allowable errors km/h
4037 – 45
8075 – 88
120113 – 132
160150 – 176
Limit: Pointer fluctuation
(at vehicle speeds of higher than 35 km/h) ±3 km/h
TACHOMETER CHECK
1. Insert a paper clip in the engine speed detection connector
from the harness side, and attach the engine
speedometer.
2. Compare the readings of the engine speedometer and
the tachometer at every engine speed, and check if the
variations are within the standard values.
Standard values:
700 r/min : ±100 r/min
3,000
*1 r/min : ±150 r/min
3,000*2 r/min : +225 to –100 r/min
5,000*1 r/min : ±250 r/min
5,000*2 r/min : +325 to –125 r/min
6,000*1 r/min : ±300 r/min
7,000*2 r/min : +400 to –100 r/min
8,000*3 r/min : +400 to 0 r/min
NOTE
*1: Tachometer measurable up to 8,000 r/min
*2: Tachometer measurable up to 9,000 r/min and one measurable up to 10,000 r/min
*3: Tachometer measureble up to 10,000 r/min
Wheel chocks
Tension bar
Tie-down hook
Front
Anchor plate
Engine speed detection
connector

CHASSIS ELECTRICAL – Headlamp54-32
HEADLAMP
SERVICE SPECIFICATIONS
ItemsStandard valueLimit
Headlamp
aiming
High
beam
Vertical direction25’ (22 mm) below horizontal line–
aiming
[Parenthe-
sized are
allowable
beam
Horizontal
directionLeft head-
lampParallel to direction of vehicle travel–
allowable
beam axis
deviations 3
m ahead of
Right head-
lamp15’ (13 mm) leftward from vertical line (V)–
m ahead of
headlamp.]Low
beam
Vertical direction25’ (22 mm) below horizontal line–p]beam
Horizontal directionPosition where 15* rising section intersects
vertical line (V)–
Headlamp intensity cd (Center of high-beam high intensity
zone)–15,000 or
more per
light
Cautions in Handling Headlamp Assembly
Each headlamp assembly has a plastic outer lens on. Observe the do’s and don’ts below when
handling the headlamps.

Do not leave the headlamps lit for longer than 3 minutes with a protective cover on.

Do not mask the outer lens surface by taping or in any other way.

Do not scrub the outer lens surface with a pointed tool.

Use the designated wax remover for cleaning the outer lens surface. Rinse it thoroughly.

Use the designated genuine bulbs.
SPECIAL TOOLS
ToolNumberNameUse
MB991502MUT-II sub as-
semblyETACS-ECU input signal checking

CHASSIS ELECTRICAL – Headlamp54-33
TROUBLESHOOTING
DIAGNOSIS FUNCTION
INPUT SIGNAL INSPECTION POINTS
Refer to Group 00 – How to Use Troubleshooting / Inspection Service Points.
The lighting monitor buzzer does not sound even when
the ignition key is removed with the tail lamps or
headlamps ON and the driver’s side door open. [However,
the key reminder warning buzzer sounds when inserting
the key into the ignition key cylinder.
Probable cause
The cause is probably a malfunction of the lighting switch input circuit system or
a malfunction of ETACS-ECU or buzzer ECU. When the key reminder warning buzzer
is sounding, the lighting monitor warning buzzer does not sound even if the tail lamps
or headlamps are lit.
Malfunction of harness or connector

Malfunction of ETACS-ECU

Malfunction of buzzer ECU

MUT-II Pulse check
OK:MUT-II buzzer sounds once
when the lighting switch is
turned from OFF to TAIL or
HEAD.NG
Check the following connectors.
B-79Repair
OK
Check trouble symptom.NGOK
Replace the ETACS-ECU.

NG
Check the harness in the junction block.NG
Replace the ETACS-ECU or the buzzer
ECU.OKRepair NG

CHASSIS ELECTRICAL – Headlamp54-35
Standard values:
Vertical direction25’ (22 mm) below hori-
zontal line (H)
Horizontal
directionLeft headlampParallel to direction of
vehicle travel
Right head-
lamp15’ (13 mm) leftward
from vertical line (V)
Caution:
(1) Perform aiming adjustments, one light at a time,
with the other headlamp disconnected so as not
to be lit unless circumstances compel otherwise.
When reconnecting the headlamps, be careful not
to upset their aim. Do not leave the headlamps
on for any longer than 3 minutes if their outer
lenses are covered with a surface covering
impervious to light.
(2) Do not mask the outer lenses by taping or in any
other way.
(3) Aiming adjustment must be completed with the
aiming adjustment screws turned in the tightening
direction.
INTENSITY MEASUREMENT
1. Position the tester so that its light sensor faces each
headlamp center to center at the appropriate distance
shown.
2. Maintain an engine speed of 2,000 r/minto keep the battery
in the charged condition.
3. Check that the high-beam headlamp intensity at the center
of the high intensity zone satisfies the limit value.
Limit: 15,000 cd or more per headlamp
Caution
(1) Perform intensity measurement, one headlamp at
a time, with the low-beam lamp and the other
headlamp disconnected from the battery unless
circumstances compel otherwise. Do not leave
the headlamps on for any longer than 3 minutes
if their outer lenses are covered with a surface
covering impervious to light.
(2) Do not mask the outer lens surfaces by taping
or in any other way.
HEADLAMP BULB REPLACEMENT
1. Disconnect the connector.
2. Remove the socket cover.
3. Unhook the spring which secures the bulb, and then
remove the bulb.
Caution
Do not touch the surface of the bulb with hands or
dirty gloves. If the surface does become dirty, clean
it with alcohol or thinner, and let it dry thoroughly
before installing.

Lamp center
Vertical direction
Vertical direction High
intensity
zone
center
(optical
axis)
High
intensity
zone
center
(optical
axis)High intensity zone
High intensity zoneLamp center V
H
V
H
Screen type tester: 3 m Converging
lens type tester: 1 m
Spring

CHASSIS ELECTRICAL – Front Fog Lamp54-40
Standard values:
Vertical direction2° (349 mm) below horizontal line
(H)
Horizontal direction3° (524 mm) leftward from
vertical line (V)
Caution:
(1) Perform aiming adjustments, one light at a time,
with the other headlamp disconnected so as not
to be lit unless circumstances compel otherwise.
When reconnecting the headlamps, be careful not
to upset their aim. Do not leave the headlamps
on for any longer than 3 minutes if their outer
lenses are covered with a surface covering
impervious to light.
(2) Do not mask the outer lenses by taping or in any
other way.
(3) Aiming adjustment must be completed with the
aiming adjustment screws turned in the tightening
direction.
FOG LAMP BULB REPLACEMENT
1. Remove the fog lamp.
2. Remove the cover.
3. Unhook the spring which secures the bulb and then
replace the bulb.
Caution
(1) Do not touch the surface of the bulb with hands
or dirty gloves. If the surface does become dirty,
clean it with alcohol or thinner, and let it dry
thoroughly before installing.
(2) To prevent the clouding of lens and ingress of
water into the lamp unit, install the socket cover
correctly.
Lamp center
Vertical
direction
High
intensity
zone
center
(optical
axis)High intensity zone
Horizontal directionV
H
Cover

CHASSIS ELECTRICAL – Radio and Tape Player54-45
RADIO AND TAPE PLAYER
TROUBLESHOOTING
There is noise when the engine is running.
Kind of Noise (Parenthe-
sized is how noise
sounds.)SymptomCauseRemedy
AM, FM: Ignition noise
(Popping, snapping,
crackling, buzzing)
Popping sound becomes
faster with the increase
of engine speed.

The noise is lost with
ignition switch turned to
ACC.
Mainly due to the
spark plugs.

Due to noise circula-
tion from elsewhere

Noise from the engineCheck the noise capacitor
and earth cable and
replace if necessary. (See
Fig. 1 and Fig. 2.)
AM, FM: Defogger noise
(1) (Murmuring)Occurs when the defogger
switch is turned to ON and
OFF.Noise produced by spark-
ing when the defogger
switch is turned to ON/
OFF enters the glass
antenna.Check the noise capacitor
and replace if necessary.
(See Fig. 1.)
AM, FM: Defogger noise
(2) (Snapping noise)Occurs when the defogger
switch is turned to ON.Noise produced by current
flowing in the defogger
enters the glass antenna.Check the choke coil and
replace if necessary.
(See Fig. 3.)
AM, FM: Defogger noise
(3) (Scratching, gaggling)Occurs when the defogger
switch is turned to ON with
print heater wire broken.Noise produced by spark-
ing where print heater is
broken enters the glass
antenna.Repair the print heater.
AM, FM: Wiper motor
noise (Humming, wheez-
ing)Sound becomes faster with
the increase of wiper speed
and is lost when the wiper is
stopped.Caused by sparking in
wiper motor brush.Replace the wiper motor.
FM: Mirror motor noise
(Humming, wheezing)Occurs when electric mirror
operates.Caused by sparking in
mirror motor brush.Replace the electric
motor.
Other electrical compo-
nents–Noise is emitted by some
electrical components in
long use.Repair or replace electri-
cal components.
Static electricity (Crack-
ling, crinkling)
Noise is stopped when
the vehicle comes to a
complete stop.

Noise becomes louder
when the clutch is
released.Occurs when parts or
wiring move for some
reason and contact metal
parts of the body.Put parts or wiring into
position.
Various noises are produced
by body parts.Due to electrical detach-
ment of the hood, exhaust
pipe and muffler, suspen-
sion, etc. from the body.Tighten mounting bolts
securely. In many cases,
remedy of one part does
not eliminate the problem
due to incomplete earthing
elsewhere.
Caution
(1) Never let the noise filter contact a high tension cable. The noise filter could break down.
(2) Check that there is no external noise. This check is necessary to prevent misidentification of noise
sources.
(3) Noise prevention should be performed by eliminating noise sources in the descending order of loudness.

CHASSIS ELECTRICAL – Antenna54-49
REMOVAL SERVICE POINT
AANTENNA ASSEMBLY REMOVAL
To facilitate the installation work of the antenna assembly,
perform the following before removing the feeder cable:
1. Tie a cord to the end of the feeder cable.
2. Pull out the antenna assembly until the end of the drain
pipe can be seen.
3. Pass the cord through the hole in the end of the drain
pipe and wrap it with vinyl tape.
Caution
Wrap it securely so that the cord will not come off.
4. Pull out the antenna assembly little by little to remove
it.
REAR WINDOW ANTENNA AND GLASS DIVERSITY ANTENNA
REMOVAL AND INSTALLATION
12
Removal steps

Glove box

Front pillar trim (LH), center pillar trim
(LH), rear pillar trim (LH)
Assist grip
1. Radio and tape player
A2. Antenna assembly
Feeder cable
Cord
Cord
Tape
Hole