1991 MITSUBISHI MONTERO steering wheel
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if possible. If proper
adjustment cannot be obtained,
require repair or replacement
of worn component.
Wheel bearing race
is loose in the
hub bore ............... A ...... Require replacement of hub
assembly and wheel bearings.
Wheel bearing races
are pitted ............. A .. Require replacement of bearing
assembly.
Wheel bearing races
are worn ............... A .. Require replacement of bearing
assembly.
Wheel bearing rollers
are pitted ............. A .. Require replacement of bearing
assembly.
Wheel bearing rollers
are worn ............... A .. Require replacement of bearing
assembly.
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WHEEL ALIGNMENT
WHEEL ALIGNMENT
Wheel alignment is defined as the measurement, analysis, and
adjustment of steering and suspension angles to conform to OEM
specifications. These angles usually include, but are not limited to:
caster, camber, toe, and thrust angle. Where these angles are not
adjustable and not in specification, component replacement or
correction kits may be required. Errors in set-back and steering axis
inclination (SAI) are often attributable to failed or damaged
components and must be corrected prior to performing an alignment.
Failure to replace or correct suggested parts or service may
prevent a proper alignment.
Before performing an alignment check, inspect and verify the
following:
* Tire pressure and size
* Vehicle loading
* Ride height
* Steering and suspension parts
If the inspection reveals that all the above are within
published specifications, a wheel alignment check and an alignment, if
needed, may be performed.
CAUTION: Under no circumstances should a technician bend or heat
any steering or suspension component, unless specified by
the vehicle manufacturer, for example, Ford forged twin
"I" beam axles. All measurements and specifications must
be noted on the inspection report.
WHEEL ALIGNMENT INSPECTION
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Condition Code Procedure
Dog tracking, shown
to be caused by
faulty alignment ....... 2 ................ Suggest repair.
Lead, shown to
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be caused by
faulty alignment ....... A ............. Require alignment.
Part has been changed,
affecting alignment .... A ....... Require alignment check.
Pull, shown to be caused
by faulty alignment .... A ............. Require alignment.
Steering wheel
off-center ............. 2 ............. Suggest alignment.
Tire wear, shown
to be caused by
faulty alignment ....... A ............. Require alignment.
Wander, shown
to be caused by
faulty alignment ....... A ............. Require alignment.
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WHEELS AND TIRES
TIRES
These guidelines do not apply to split rims. Some vehicle
manufacturers restrict replacement of tires to specific brands, types,
or sizes.
WARNING: High pressure temporary compact spare tires should not be
used with any other rims or wheels, nor should standard
tires, snow tires, wheel covers, or trim rings be used
with high pressure compact spare rims or wheels.
Attempting to mount a tire of one diameter on a wheel of
a different diameter or flange type may result in serious
injury or death.
WARNING: Only specially trained persons should dismount or mount
tires. Explosions of tire and wheel assembly can result
from improper mounting, possibly causing serious injury
or death.
WARNING: Consult the vehicle owner's manual or vehicle placard for
correct size, speed rating, designation, and cold
inflation pressure of the original tires. DO NOT exceed
the maximum load or inflation capacity of the tire
specified by the Tire and Rim Association
WARNING: When replacing tires, it is suggested that the
replacement tires match or exceed the OEM speed rating
designation. If tires of different speed rating
designations are mixed on the same vehicle, the tires may
vary in handling characteristics. DO NOT mix different
speed rating designations on the same axle.
WARNING: DO NOT mix radials with non-radial tires on the same
axle, as this may affect vehicle handling and stability.
If radial tires and bias or bias-belted ply tires are
mixed on the same vehicle, the radials must be on the
rear. High-pressure temporary compact spare tires are
exempt from this rule.
WARNING: DO NOT mix size or type (all season, performance, mud and
snow) of tires on the same axle.
TIRE INSPECTION
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Circuit Circuit
Application Terminals Terminals
Montero, Pickup 3.0L & Ram-50 3.0L ..... 2 & 4 ............. 1 & 3
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POWER STEERING OIL PRESSURE SWITCH
1) Power steering oil pressure switch is mounted on power
steering pump. Disconnect single wire connector at switch. Start
engine.
2) Connect ohmmeter between switch terminal and ground. If
continuity is present with steering wheel in straight-ahead position,
replace switch. If continuity is not present while turning steering
wheel, perform POWER STEERING IDLE-UP SYSTEM TEST. See IDLE-UP SYSTEMS
under IDLE CONTROL SYSTEM.
THROTTLE POSITION SENSOR
1) TPS is mounted to throttle body, at end of throttle shaft.
Disconnect TPS connector. See Fig. 6. Using ohmmeter, measure total
resistance between TPS connector terminals as specified in TPS
CONNECTOR TERMINAL IDENTIFICATION table. If resistance is not 3500-
6500 ohms, replace TPS.
2) Using an analog (needle-type) ohmmeter, measure variable
resistance between TPS connector terminals as specified in TPS
CONNECTOR TERMINAL IDENTIFICATION table.
3) Operate throttle valve from closed to wide open throttle.
If rate of resistance does not change smoothly within 3500-6500 ohms
throughout range of throttle valve movement, replace TPS.
Fig. 6: TPS Sensor Connector Terminal ID
Courtesy of Mitsubishi Motor Sales of America.
TPS CONNECTOR TERMINAL IDENTIFICATION TABLE
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assembly.
IDLE-UP SYSTEMS
Power Steering Idle-Up System Test
1) Disconnect pressure hose from power steering pump. Connect
in-line a pressure gauge and hoses capable of handling 300 psi (21
kg/cm
). Also connect a shut-off valve in-line with pressure gauge.
See Fig. 13 .
Fig. 13: Connecting Pressure Gauge Shutoff Valve Assembly
Courtesy of Mitsubishi Motor Sales of America.
2) Bleed air from system by disabling ignition system and
cranking engine while turning steering wheel completely from left to
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right several times. Start engine, and turn steering wheel back and
forth to raise fluid temperature to approximately 122-140F (50-60C).
3) With engine idling, gradually close shutoff valve of
pressure gauge to increase hydraulic pressure. If idle speed does not
increase 200-250 RPM when fluid pressure reaches 213-284 psi (15-20
kg/cm
), replace power steering idle-up switch.
4) Gradually open shutoff valve. If engine speed does not
return to curb idle speed between 100-142 psi (7-10 kg/cm
), replace
power steering idle-up switch. Remove testing equipment. Bleed air
from system as in step 2).
IGNITION SYSTEM
NOTE: For basic ignition checks, see F - BASIC TESTING article in
ENGINE PERFORMANCE Section.
TIMING CONTROL SYSTEMS
Crank Angle Sensor
Crank angle sensor is located inside distributor on SOHC
engines and is attached to cylinder head on DOHC engines. If
malfunction occurs, Code 22 will set. For testing procedure, see
appropriate G - TESTS W/CODES article in the ENGINE PERFORMANCE
Section.
EMISSION SYSTEMS & SUB-SYSTEMS
EXHAUST GAS RECIRCULATION (EGR)
System Testing (Federal)
1) Disconnect Green-striped hose from throttle body, and
connect vacuum pump to hose end. Plug nipple where hose was connected
to throttle body. When engine is cold, 122
F (50C) or less, and at
idle, apply vacuum to disconnected hose. If idle does not change and
vacuum bleeds down, system is okay.
2) When engine is hot, 205
F (95C), and at idle, apply 1.8
in. Hg. If idle does not change and vacuum holds, system is okay.
Using a vacuum pump, apply 7.7 in. Hg. If idle becomes unstable or
engine stalls (and vacuum holds), system is okay.
System Testing (California)
1) Connect vacuum "T" fitting into Green-striped hose from
EGR valve, and connect vacuum gauge to vacuum tee. When engine coolant
temperature is 68
F (20C) or less and engine is idling, snap throttle
open to race engine. If no change in vacuum reading is detected on
gauge, system is okay.
2) When engine coolant temperature is 158
F (70C) or more
and engine is idling, snap throttle open to race engine. If vacuum
increases to 3.9 in. Hg or higher, system is okay.
3) Using vacuum pump, apply specified vacuum to open EGR
valve. See EGR VALVE SPECIFICATIONS table. If idle becomes unstable or
engine stalls, system is okay.
EGR Control Solenoid Valve (Pickup & Ram-50, California)
1) EGR control solenoid valve is located near left shock
tower. Label and disconnect vacuum hoses and wiring harness from
solenoid valve.
2) Connect hand vacuum pump to vacuum nipple where Green-
striped vacuum hose was connected. Apply vacuum and ensure vacuum does
not hold. Apply battery voltage to one terminal of solenoid, and
ground other. Ensure vacuum holds.
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problem symptoms. For model-specific Trouble Shooting,
refer to SUBJECT, DIAGNOSTIC, or TESTING articles available
in the section(s) you are accessing.
BASIC FWD AXLE SHAFTS & CV JOINTS TROUBLE SHOOTING CHART
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CONDITION POSSIBLE CAUSE \
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Grease Leaks CV boot torn or cracked \
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Clicking Noise on Cornering Damaged outer CV \
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Clunk Noise on Acceleration Damaged inner CV \
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Vibration or Shudder Sticking, damaged or worn CV
on Acceleration Misalignment or spring height
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STEERING & SUSPENSION
MANUAL STEERING GEAR TROUBLE SHOOTING
NOTE: This is GENERAL information. This article is not intended
to be specific to any unique situation or individual vehicle
configuration. The purpose of this Trouble Shooting
information is to provide a list of common causes to
problem symptoms. For model-specific Trouble Shooting,
refer to SUBJECT, DIAGNOSTIC, or TESTING articles available
in the section(s) you are accessing.
BASIC MANUAL STEERING GEAR TROUBLE SHOOTING CHART
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CONDITION POSSIBLE CAUSE CORRECTION \
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Rattle or Rack and pinion mounting Tighten all mounting
Chucking Noise bracket loose bolts
in Rack and
Pinion Lack of/or incorrect Correct as necessary
lubricant
Steering gear mounting Tighten all mounting
bolts loose bolts
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Excessive Play Front wheel bearing See FRONT SUSPENSION
improperly adjusted article
Loose or worn steering See STEERING LINKAGE
linkage article
Loose or worn steering See MANUAL STEERING
gear shift GEAR article
Steering arm loose on See MANUAL STEERING
gear shaft GEAR article
Steering gear housing Tighten all mounting
bolts loose bolts
Steering gear adjustment See MANUAL STEERING
too loose GEAR article
Steering arms loose on Tighten and check
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knuckles steering linkage
Rack and pinion mounting Tighten all mounting
loose bolts
Rack and pinion out of See adjustment in
adjustment STEERING article
Tie rod end loose Tighten and check
steering linkage
Excessive Pitman shaft-to- Repair as necessary
ball nut lash
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Poor Lack of lubricant in ball Lubricate and service
Returnability joint or linkage systems
Binding in linkage or ball See STEERING LINKAGE
joints and SUSPENSION article
Improper front end alignment See WHEEL ALIGNMENT
article
Improper tire pressure Inflate to proper
pressure
Tie rod binding Inflate to proper
pressure
Shaft seal rubbing shaft See STEERING COLUMN
article
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Excessive Improper tire pressure Inflate to proper
Vertical Motion pressure
Tires, wheels or rotors Balance tires then
out of balance check wheels and
rotors
Worn or faulty shock Check and replace if
absorbers necessary
Loose tie rod ends or Tighten or replace if
steering necessary
Loose or worn wheel See SUSPENSION article
bearings
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Steering Pulls Improper tire pressure Inflate to proper
to One Side pressure
Front tires are different Rotate or replace if
sizes necessary
Wheel bearings not See FRONT SUSPENSION
article
adjusted properly
Bent or broken suspension See FRONT SUSPENSION
components article
Improper wheel alignment See WHEEL ALIGNMENT
article
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![MITSUBISHI MONTERO 1991 Service Manual Brakes dragging See BRAKES article \
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\](/manual-img/19/57332/w960_57332-1240.png "MITSUBISHI MONTERO 1991 Service Manual Brakes dragging See BRAKES article \
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Brakes dragging See BRAKES article \
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Instability Low or uneven tire Inflate to proper
pressure pressure
Loose or worn wheel See FRONT SUSPENSION
bearings article
Loose or worn idler arm See FRONT SUSPENSION
bushing article
Loose or worn strut See FRONT SUSPENSION
bushings article
Incorrect front wheel See WHEEL ALIGNMENT
alignment article
Steering gear not See MANUAL STEERING
centered GEARS article
Springs or shock Check and replace if
necessary
Improper cross shaft See MANUAL STEERING
GEARS article
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POWER STEERING TROUBLE SHOOTING
NOTE: This is GENERAL information. This article is not intended
to be specific to any unique situation or individual vehicle
configuration. The purpose of this Trouble Shooting
information is to provide a list of common causes to
problem symptoms. For model-specific Trouble Shooting,
refer to SUBJECT, DIAGNOSTIC, or TESTING articles available
in the section(s) you are accessing.
BASIC POWER STEERING TROUBLE SHOOTING CHART
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CONDITION POSSIBLE CAUSE CORRECTION \
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Rattle or Pressure hoses touching Adjust to proper
Chucking Noise engine parts clearance
Loose Pitman shaft Adjust or replace if
necessary
Tie rods ends or Pitman Tighten and check system
arm loose
Rack and pinion mounts Tighten all mounting
loose bolts
Free play in worm and See POWER STEERING GEAR
article
Loose sector shaft or See POWER STEERING GEAR
thrust bearing adjustment
Free play in pot coupling See STEERING COLUMN
article