1987 MITSUBISHI MONTERO engine

CHARGING SYSTEM - Service Adjustment Procedures 8-79
Result
(1) The ammeter reading must be higher than the limit value. If it
is lower but the alternator output wire is normal, remove the
alternator from the vehicle and check it.
Limit value : 31 A min.
Caution
1. The nominal output current value is shown on the
nameplate affixed to the alternator body.
2. The output current value changes with the electrical
load and the temperature of the alternator itself.
Therefore, the nominal output current may not be ob-
tained if the vehicle electrical load at the time of test is
small. In such a case, keep the headlights on to cause
discharge of the battery or use lights of another vehi-
cle as a load to increase the electrical load. The nom-
inal output current may not be obtained if the temper-
ature of the alternator itself or abmient temperature is
too high. In such a case, reduce the temperature be-
fore testing again.
(2) Upon completion of the output current test, lower the engine
speed to the idle speed and turn off the ignition switch.
(3) Disconnect the battery ground cable.
(4) Remove the test ammeter and voltmeter and the engine ta-
chometer.
(5) connect the alternator output wire to the alternator “B” ter-
minal.
(6) Connect the battery ground cable.
REGULATED VOLTAGE TEST
The purpose of this test is to check that the electronic voltage
regulator controls the voltage correctly.
Preparation
(1) Prior to the test, check the following items and correct if nec-
essary.
(a) Check the battery installed on the vehicle to see that it is
fully charged. For battery checking method, see “BAT-
TERY”.
(b) Check the alternator drive belt tension. For belt tension
check, see “GROUP 7 COOLING - Service Adjustment
Procedures”.
(2) Turn the ignition switch to “OFF”.
(3) Disconnect the battery ground cable.
(4) Connect a digital voltmeter between the “S” terminal of the
alternator and ground. Connect the (+) lead of the voltmeter to
the “S” terminal of the alternator, inserting from the wire side
of the 2-way connector and connect the (-1 lead to sound
ground or battery (-) terminal.
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8-80 CHARGING SYSTEM - Service Adjustment Procedures
Ignition
switch Alternator
Voltmeter
I
lid-hi! @ Ammeter e Load
6EK52
(5) Disconnect the alternator output wire from the alternator “B”
terminal.
(6) Connect a DC ammeter (0 to 100 A) in series between the “B”
terminal and the disconnected output wire. Connect the (+I
lead of the ammeter to the “B” terminal and connect the (-1
lead wire to the disconnected output wire.
(7) Set the engine tachometer and connect the battery ground
cable.
Test
(1) Turn on the ignition switch and-check that the voltmeter indi-
cates the following value.
Voltage : Battery voltage
If it reads 0 V, there is an open circuit in the wire between the
alternator “S” terminal and the battery (+) or the fusible link
is blown.
(2) Start the engine. Keep all lights and accessories off.
(3) Run the engine at a speed of about 2500 rpm and read the
voltmeter when the alternator output current drops to 10 A or
less.
Result
(1) If the voltmeter reading agrees with the value listed in the
regulating voltage table below, the voltage regulator is func-
tioning correctly. If the reading is other than the standard
value, the voltage regulator or the alternator is faulty.
Regulating voltage table
Voltage regulator ambient Regulating voltage V
temperature “C (“F)
-20 (-4) 14.2-15.4
20 (68) 13.9-14.9
60 (140) 13.4-14.6
80 (176) 13.1-14.5
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CHARGING SYSTEM - Service Adjustment Procedures 8-81
(2) Upon completion of the test, set the engine speed at idle and
turn off the ignition switch.
(3) Disconnect the battery ground cable.
(4) Remove the test voltmeter and ammeter and the engine ta-
chometer.
(5) Connect the alternator output wire to the alternator “B” ter-
minal.
(6) Connect the battery ground cable.
ll3Y1848 2. Remove battery from vehicle.
Caution
White
I Blue
I Care should be taken in the event battery case is cracked
or leaking to protect hands from the electrolyte. A suit-
able pair of rubber gloves (not the household type) should
be worn when removing battery by hand.
3. Inspect battery carrier for damage caused by loss of acid from
battery. If acid damage is present, it will be necessary to clean
area with a solution of clean warm water and baking soda.
Scrub area with a stiff bristle brush and wipe off with a cloth
moistened with ammonia or baking soda in water.
4. Clean top of battery with same solutions as described in Step
(3).
INSPECTION OF BATTERY NOBEIBA
VISUAL INSPECTION OF BATTERY (1)
The batten/ contains a visual test indicator which gives blue signal
when an adequate charge level exists, and white signal when
charging is required.
VISUAL INSPECTION OF BAlTERY (2)
Make sure ignition switch is in Off position and all battery feed
accessories are Off.
1. Disconnect ground cable from battery before disconnecting
(+) cable.
5. Inspect battery case and cover for cracks. If cracks are
present, battery must be replaced.
6. Clean the battery post with a suitable battery post cleaning
tool.
7. Clean the inside surfaces of the terminal clamps with a suit-
able battery terminal cleaning tool. Replace damaged or frayed
cables and broken terminals clamps.
8. Install the battery in vehicle.
9. Connect (+) and (-) cables to battery in the order of mention.
10. Tighten the clamp nut securely.
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STARTING SYSTEM-General Information 8-91
STARTING SYSTEM
GENERAL INFORMATION
NOBFAAJ
The electrical circuit of the starter system consists of battery, starter motor, solenoid switch, ignition switch,
inhibitor switch, connecting wire and battery cable.
In the starter system and electrical circuit, electricity flows to activate the coils of the starter motor solenoid when
the ignition switch is turned to the start position. In so doing, the solenoid plunger and clutch shift lever move, the
clutch pinion engages with the ring gear and then the solenoid contacts shut and the starter motor cranks.
As soon as the engine begins to run and, in order to prevent damage due to over-revolution by the armature starter,
the running clutch pinion gear over-rides, Thus in order not to cause damage to the starter motor once the engine
is running, the ignition switch must be immediately turned back to the ON position.
The starter motor is the reduction-drive type, and is compact and lightweight.
Inhibiter switch
-
I lEL151
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8-94 STARTING SYSTEM -Troubleshooting
TROUBLESHOOTING NOFH-
Symptom
Engine will not crank
Engine cranks slowly
Starter keeps running
Starter spins but en-
Jine will not crank Probable cause Remedy Reference
paw
Battery charge low Check battery specific gravity 8-81
,
I Charge or replace battery 8-82
Battery cables loose, corroded or worn Repair or replace cables 8-81
__~
Inhibitor Switch faulty Adjust or replace switch Refer to
(Vehicle with automatic transmission only) GROUP 21.
Fusible link blown
Replace fusible link 8-69
Starter motor faulty
Repair starter motor 8-97
Ignition switch faulty Replace ignition switch 8-l 22
Battery charge low Check battery specific gravity 8-8 1
Charge or replace battery 8-82
Battery cables loose, corroded or worn
Repair or replace cables 8-8 1
Starter motor faulty Repair starter motor 8-97
Starter motor faulty Repair starter motor 8-97
Ignition switch faulty
Replace ignition switch 8-l 22
I
Short in wiring
Repair wiring -
Pinion gear teeth broken or starter motor Repair starter motor 8-97
faulty
Ring gear teeth broken Replace flywheel ring gear or Refer to
torque converter GROUP 9.
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-7

IGNITLON SYSTEM -Troubleshooting 8-109
TROUBLESHOOTING
NOBGH--
Symptom Probable cause
Remedy
Reference
paw
Engine will not start or
Incorrect ignition timing
8-111
hard to start (cranks Adjust ignition timing
OKI Ignition coil faulty
Inspect ignition coil 8-116
Ignition faulty
Inspect igniter
8-120
Distributor faulty
Inspect distributor 8-120
High tension cord faulty
Inspect high tension 8-116
cord
Spark plugs faulty Replace plugs 8-115
Ignition wiring disconnected or broken
Inspect wiring -
Rough idle or stalls
Spark plugs faulty
Replace plugs 8-115
Ignition wiring faulty
Inspect wiring -
Incorrect ignition timing
Adjust ignition timing
8-111
Ignition coil faulty
Inspect ignition coil 8-116
Ignition faulty
Inspect igniter 8-120
High tension cord faulty
Inspect high tension 8-116
cord
Engine hesitates/poor
acceleration Spark plugs faulty Replace plugs 8-115
Ignition wiring faulty
Inspect wiring -
Incorrect ignition timing
Adjust timing 8-111
Poor gasoline mileage
Spark plugs faulty Replace plugs 8-115
Incorrect ignition timing Adjust ignition timing 8-111
Engine overheats Incorrect ignition timing
Adjust ignition timing
8-111 1 STB Revision

IGNITION SYSTEM - Service Adjustment Procedures 8-111
SERVICE ADJUSTMENT PROCEDURES
CHECKING IGNITION TIMING NOEGIBA
IGNITION TIMING ADJUSTMENT
Adjustment conditions:
Coolant temperature: 80-90°C (170-I 90°F)
Lights and all accessories: Off
Transmission: N (Neutral)
1. Connect tachometer and timing light.
2. Start eng.ine and run at curb idle speed.
I
Curb idle speed rpm
First 500 km
(300 mile)
After 500 km
(300 mile)
725';;;
800 ?I00 3. To make adjustment at high altitude, disconnect pressure
sensor connector before stopping engine. Then restart
engine and run it at curb idle speed.
4. Check basic ignition timing and adjust if necessary.
Basic ignition timing: 7” + 2”BTDC 5. To adjust ignition timing, loosen distributor mounting nut
and turn distributor housing.
6. After adjustment, securely tighten mounting nut.
7. Reconnect pressure sensor connector disconnected in
Step 3. Then run engine at curb idle speed to make sure
that actual ignition timing is obtained.
. .
CHECKING IGNITION SYSTEM NOBDIDB
CHECKING CENTRIFUGAL ADVANCE EQUIPMENT 1.
Set the tachometer and timing light.
2. Start the engine and allow it to idle.
3. Pull out vacuum hose from vacuum controller.
4. Check the advance while slowly raising RPM. If the advance is
smooth when accompanying the increasing RPM, this is
normal.
Symptom Assumed causes
Excessive advance
Weakness of the governor spring
Sudden advance rise
Broken spring
Insufficient advance or large
Impaired movement of the gover-
hysteresis
nor weight or cam.
5. If the malfunction indicators above are confirmed, dismantle
and check the distributor.
6. After checking, let the engine idle and then turn the ignition
switch to OFF.
7. Remove the tachometer and timing light.‘.
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8-112 IGNITION SYSTEM - Service Adjustment Procedures
CHECKING NEGATIVE PRESSURE ADVANCE EQUIPMENT
1. Set the timing light.
2. Start the engine and allow it to idle.
3. Pull out the vacuum hose from vacuum controller and attach
vacuum pump to nipple.
4. Check the advance while slowly applying negative pressure to
the vacuum pump. If the advance is smooth when accompa-
nying the increase in negative pressure, this is normal.
Secondary cable
~~
Primaw 6-8 mm
Cylinder
block
cable ’ (.24-.31 in.) 5ELO45 1
Spark plug
5ELO46
Iefective insula
5ELO47
/
Symptom
Excessive advances
Sudden advance rise
Insufficient advance or large
hysteresis
No advance Assumed causes
Weakness of vacuum controller
spring
Broken spring
Impaired movement of breaker
base
Broken diaphragm
5. If the malfunction indicators above are confirmed, dismantle
and check the distributor.
6. Allow the engine to idle and then turn the ignition switch to
OFF.
7. Remove the vacuum pump and attach the vacuum hose to the
vacuum controller nipple.
8. Remove the timing light.
SPARK PLUG CABLE TEST NWGIGB
Hold the spark plug cable about 6-8 mm (.24-.31 in.) away from
engine proper (grounding portion such as cylinder block) and crank
engine to verify that sparks are produced.
SPARK PLUG TIEST NOUGIHB
Connect the spark plug to the high tension cable, ground outer
electrode (main body), and crank engine. In the atmosphere, only
short sparks are produced because of small discharge gap. If the
spark plug is good, however, sparks will occur in discharge gap
(between electrodes). In a defective spark plug, no sparks will
occur because of leak of insulation puncture.
fvision
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