Timing MITSUBISHI MONTERO 1987 1.G Workshop Manual

8-1
ELECTRICAL
CONTENTS
NOBAA-
ACCESSORY ......................................................
188
Cigarette Lighter ............................................
,190
Clock ...............................................................
,191
AUDIO SYSTEM ................................................
.192
AUTOMATIC FREE-WHEELING HUB
INDICATOR SYSTEM ........................................
208
Automatic Free-wheeling Hub
Indicator Control Unit
..................................... ,216
Pulse Generator ..............................................
215
BACK DOOR WINDOW DEFOGGER
................ .203
Defogger switch ............................................
,206
Printed Heater Lines
...................................... ,207
CHARGING SYSTEM .........................................
71
Alternator ........................................................
83
Service Adjustment Procedures
..................... 77
Battery Charging ........................................
82
Inspection of Battery ..................................
81
Output Current Test ...................................
78
Regulated Voltage Test ..............................
79
Voltage Drop Test of Alternator Output
Wire ............................................................
77
ELECTRICAL SYSTEM PARTS LOCATION
...... 2
Diode ...............................................................
5
Fusible Link and Fuse
..................................... 6
Grounding .......................................................
7
Relay and Control Unit ....................................
2
Sensor .............................................................
4
HORN ..................................................................
184
Horn Switch
.................................................... 187
IGNITION SYSTEM ............................................
105
Ignition Switch
................................................ 122
Ignition System ...............................................
1 14
Service Adjustment Procedures
.................... .l 1 1
Checking Ignition System
..........................
11 1
Checking Ignition Timing
...........................
11 1
Spark Plug Cable Test
................................
1 12
Spark Plug Test
.......................................... 1 12 INSPECTION OF HARNESS CONNECTOR ...... 9
Check for Improper Engagement of
Terminal .......................................................... 9
Continuity and Voltage Test for Connector .... 9
Engaging and Disengaging of Connector
Terminal ..........................................................
9
LIGHTING SYSTEM ........................................... 143
Column Switch
................................ .
.............. .I59
Dimmer Control Switch
................................. .I62
Hazard Warning Switch
................................. .I61
Headlight ........................................................ ,158
Service Adjustment Procedures
.................... .I57
Headlight Aiming .......................................
157
METERS AND GAUGES .................................... 123
Service Adjustment Procedures
.................... .I30
Fuel Gauge Simple Test ................................. .I31
Fuel Gauge Unit Inspection ........................... .I31
Oil Pressure Gauge Simple Test
.................... .I32
Oil Pressure Gauge Unit Simple Test
............ ,132
Speedometer Inspection
............................... .I30
Tachometer Inspection .................................. ,130
Voltage Meter Simple Test
............................ .I33
Water Temperature Gauge Simple Test
....... ..I3 1
Water Temperature Gauge Unit Inspection
. ..I3 2
STARTING SYSTEM .......................................... 91
Starter Motor ............ ....................................... 97
WIPER AND WASHER SYSTEM
....................... .163
WIRING HARNESS ............................................ 13
Centralized Junction ....................................... 69
Circuit Diagram ............................................... 34
Configuration Diagram .................................... 27
How to Read Wiring Diagrams ....................... 20
Troubleshooting .............................................. 13

8408 IGNITION SYSTEM - Specifications
SERVICE SPECIFICATIONS
N08GC-B
Items Specifications
Basic ignition timing at curb idle speed 7”BTDC
Distributor
Federal
Governor (crank deghpm)
Initial O/l 600
Middle 1 9/2800
Final 1 g/6000
Vacuum (crank deg/mmHg)
Initial
O/80
Middle 12/I 50
Final 231280
California
Governor (crank deghpm)
initial O/l 600
Middle 912800
Final 1 g/6000
Vacuum (crank deg/mmHg)
Initial O/80
Middle 8/l 50
Final 201360
Idle advance (crank deg/mmHg)
Initial O/60
Final 5180
Ignition coil
Primary resistance at 20°C (68°F) R 1.1-1.3
Secondary resistance at 20°C (68°F) k0 14.5-19.5
External resistor resistance at 20°C (68°F) 1R 1.22-1.48
Spark plug gap mm (in.) 1.0-I .I (.039-,043)
TORQUE SPECIFICATIONS
Items Nm
NOBGD-
ft.lbs.
Spark plug 20-30 15-21
1 STB Revision

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.‘.
1 STB Revision

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
I

IGNITION SYSTEM - Ignition Svstem 8-115
Good No good
721017
72T06t
16W947
SERVICE POINTS OF REMOVAL
l-4. CAUTION OF SPARK PLUG CABLES17. HIGH TENSION
CABLE
The cable is to be pulled out by grasping the cap part.
9. REMOVAL OF DISTRIBUTOR
Before removing the distributor, position the piston in No.
1 cylinder at the top dead center on compression stroke by
the following procedure.
(1) Remove the cap from the distributor.
(2) Turn the crankshaft until the distributor rotor lines up
with the No. 1 spark plug cable electrode on the
distributor cap.
(3) Align the notch on the crankshaft pulley with the timing
mark “T” on the timing indicator to set the engine
SO
that the piston in No. 1 cylinder is at the compression
top dead center.
INSPECTION
CLEANING AND INSPECTION OF SPARK PLUGS
1. Pull the spark plug cables out of the spark plugs.
2. Using a spark plug wrench, take all the spark plugs out of the
cylinder head.
Caution
Ensure that no foreign bodies fall from the spark plug
holes.
3. Using the following criteria check that there is no electrode
spark loss, that there is no damage to the outer insulation, and
that sparking is good.
l Existence of insulation damage
l Spark dissipation
l Carbon accumulation
Using either plug cleaner or wire brush, clean both the up-
per part and the glass part.
l Damage to or breakage of gaskets
l Spark action in spark glass area
In cases where there are black deposits due to carbon, this
indicates excessive passage of mixed gases so that air in-
take becomes extremely deficient.
Owing to the excessively large spark gap, spark loss and so
on can be expected.
In case of white scorching, this indicates an excessively
thin gas mixture and prolongment of sparking time, which
suggests poorly fitted plugs.
/ STB Revision
1

IGNITION SYSTEM-Ignition System 8417
Notch on
crankshaft
pulley
Stud 2
SERVICE POINTS OF INSTALLATION
9. INSTALLATION OF DISTRIBUTOR
(1) Align the notch on the crankshaft pulley with the timing
mark “T” on the timing indicator to set the engine so
that the No. 1 cylinder is at the compression top dead
center.
(2) Align mating mark on distributor housing with mating mark
on distributor driven gear.
(3) Install distributor to cylinder head while aligning mating
mark on distributor attaching flange with center of distrib-
utor installing stud and tighten nut.
l-4. INSTALLATION OF SPARK PLUG CABLE
Improper arrangement of spark plug cables will induce voltage
between the cables, causing miss firing and developing a
surge at acceleration in high-speed operation. Therefore, be
careful to arrange the spark plug cables properly by the fol-
lowing procedure.
1. Install the spark plug cable clamps as shown in the illus-
tration.
2. The numerals on the support and clamp indicate the spark
plug cable No.
3. Pay attention to the following items when the spark plug
cables are installed.
(1) Install the cables securely to avoid possible contact
with metal parts.
(2) Install the cables neatly, ensuring they are not too
tight, loose, twisted or kinked.
( STB Revision