light MITSUBISHI MONTERO 1991 Owner's Manual
Page 190 of 1333
Wear indicator device
(mechanical) contacts
rotor .................. .. ......... (6) Further inspection
required.
Worn close to minimum
specifications ......... 1 ........ ( 7) Suggest replacement.
Worn to, or below minimum
specifications ......... B ............ Require replacement.
( 1) - Identify and repair cause of contamination prior to
replacing friction material.
( 2) - When reconditioning or replacing drums or rotors,
replacement of friction material may be suggested
depending on the severity of the grooves or ridges.
( 3) - Some vehicles use pads that are tapered by design. Refer
to specific vehicle application. If not normal, require
replacement of pads and correction of cause.
( 4) - Uneven pad thickness is normal on some vehicles. Refer to
specific vehicle applications.
( 5) - The pad wear indicator light may come on due to other
electrical problems.
( 6) - Explain to the customer that the purpose of the wear
indicator is to alert him or her to check for friction
wear. Wear indicators may be bent or broken. Therefore,
the friction material must be measured. The need for
friction material replacement is determined based upon
the conditions stated in this section. Periodic inspection
is suggested.
( 7) - When the part appears to be close to the end of its useful
life, replacement may be suggested.
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G SENSORS
See ACCELEROMETERS .
HOSES
HOSE INSPECTION \
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Condition Code Procedure
Attaching hardware
broken ................. A ... Require repair or replacement
of hardware.
Attaching hardware
missing ................ C .......... Require replacement of
hardware.
Attaching hardware not
functioning ............. A ... Require repair or replacement
of hardware.
Blistered ............... B ............ Require replacement.
Fitting threads damaged . A .. Require repair or replacement.
Fitting threads stripped
(threads missing) ...... A ............ Require replacement.
Incorrectly secured ..... B ................. Require repair.
Inner fabric
(webbing) cut .......... B ............ Require replacement.
Leaking ................. A ............ Require replacement.
Missing ................. C ............ Require replacement.
Outer covering is cracked
to the extent that
inner fabric of hose
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specifications.
Wire lead open .......... A .. Require repair or replacement.
Wire lead shorted ....... A .. Require repair or replacement.
(1) - If a sensor is not adjustable, further inspection is
required to identify and correct cause.
( 2) - Determine cause and correct prior to repair or
replacement of part.
( 3) - Determine source of contamination, such as metal
particles or water. Require repair or replacement.
( 4) - Inoperative includes intermittent operation or out of OEM
specification. Some components may be serviceable; check
for accepted cleaning procedure.
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STEEL BRAKE LINES
STEEL BRAKE LINE INSPECTION \
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Condition Code Procedure
Attaching hardware
broken ................. A ... Require repair or replacement
of hardware.
Attaching hardware
missing ................ C .......... Require replacement of
hardware.
Attaching hardware not
functioning ............ A ... Require repair or replacement
of hardware.
Corroded, affecting
structural integrity ... A ............ Require replacement.
Fitting incorrect (for
example, compression
fitting) ............... B ............ Require replacement.
Flare type incorrect .... B .. Require repair or replacement.
Leaking ................. A .. Require repair or replacement.
Line material incorrect
(copper, etc.) ......... B ............ Require replacement.
Restricted .............. A ............ Require replacement.
Routed incorrectly ...... B ..... Require routing correction.
Rust-pitted ............. 1 ............ Suggest replacement.
Threads damaged ......... A .. Require repair or replacement.
Threads stripped
(threads missing) ...... A ............ Require replacement.
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STOPLIGHT SWITCHES
See BRAKE STOPLIGHT SWITCHES .
SWITCHES
NOTE: Copied from Electrical UIGs & added "float saturated" from
old fluid level sensor switches.
STEEL BRAKE LINE INSPECTION
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Condition Code Procedure
Attaching hardware
broken ................. A ... Require repair or replacement
of hardware.
Page 208 of 1333
BRAK E S YSTE M
1991 M it s u bis h i M onte ro
1991 BRAKES
Disc & Drum
Chrysler Motors: Ram-50;
Mitsubishi: Montero, Pickup
DESCRIPTION
Brake system consists of a master cylinder, vacuum power
brake unit, proportioning valve and self-adjusting assembly. Pickup
and Ram-50 models have a Load-Sensing Proportioning Valve (LSPV). All
models are equipped with front disc brakes and rear drum brakes.
Parking brake assembly activates rear brakes.
BLEEDING BRAKE SYSTEM
BLEEDING PROCEDURES
Montero
Bleed brake system in following order: right rear, right
front and left front (one circuit handles both rear brakes).
Pickup & Ram-50
Bleed brake system in following order: right rear, left rear,
LSPV, right front and left front.
ADJUSTMENTS
BRAKE PEDAL HEIGHT & FREE PLAY
1) Separate connector from stoplight switch, and loosen lock
nut. Position switch so it does not contact brake pedal arm. Adjust
brake pedal height by rotating master cylinder push rod (yoke, if
equipped) until distance from top of brake pedal to floor board is
correct. See BRAKE PEDAL SPECIFICATIONS table.
2) DO NOT depress push rod. Tighten lock nut, and ensure
brake pedal height is within specification. Start engine to evacuate
brake booster chamber. Stop engine, and apply brake several times to
remove vacuum from brake booster.
3) Using hand pressure, depress brake pedal to measure free
play before resistance is felt. If distance is incorrect, bleed the
brake hydraulic system, and check for misadjusted brakes. Refer to the
BRAKE PEDAL SPECIFICATIONS table.
BRAKE PEDAL SPECIFICATIONS TABLE
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Free Play Pedal Height
Application In. (mm) In. (mm)
Montero ............ .12-.31 (3-8) ... 7.5-7.7 (191-196)
Pickup & Ram-50 .... .12-.31 (3-8) ........... 6.5 (166)
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LOAD-SENSING PROPORTIONING VALVE (LSPV) (Pickup & Ram-50)
Park vehicle on level surface. Remove all luggage and
passengers. Ensure lever is not against stopper bolt. Check spring
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brake pedal to center shoes, and check pedal travel. Rotate brake drum
to verify free movement.
STOPLIGHT SWITCH
Loosen lock nut, and adjust switch-to-pedal arm clearance to
.02-.04" (.5-1.0 mm). Tighten lock nut. DO NOT depress master cylinder
push rod during stoplight switch adjustment.
TESTING
POWER BRAKE UNIT
Check Valve Inspection
Remove vacuum hose from power brake unit. Remove check valve
from hose (if possible). Using a vacuum pump, ensure airflow is in
direction of intake manifold only.
System Check
1) Run engine for 2 minutes, and shut it off. Depress brake
pedal several times with normal pressure. If pedal height gradually
becomes higher with successive applications, power brake unit is okay.
If pedal height remains steady, power brake unit is faulty.
2) With engine stopped, depress brake pedal repeatedly until
it's height no longer falls. Hold brake pedal down, and start engine.
If pedal moves downward slightly, power brake unit is okay. If pedal
height does not change, power brake unit is faulty.
3) With engine running, press and hold brake pedal and shut
off engine. Hold brake pedal for 30 seconds. Brake pedal height should
not change. If pedal height falls, power brake unit is faulty.
LOAD-SENSING PROPORTIONING VALVE (LSPV) (PICKUP & RAM-50)
1) Before diagnosing Load-Sensing Proportioning Valve (LSPV)\
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ensure all other brake components are operating properly. When all
other brake system components are determined to be okay, perform LSPV
test beginning with next step.
2) Ensure unladen vehicle is on level ground. Ensure lever is
not contacting stopper bolt. See Fig. 1.
3) When lever is pushed toward valve, distance from LSPV
lever hole and support hole must be 6.97-7.09 in. (177-180 mm). If
measured distance is not within specification, loosen support bolt.
Adjust support until measured distance is within specification.
4) After measured distance is within specification, connect
pressure gauges to input and output ports of LSPV. See Fig. 4. Bleed
brake system. See BLEEDING BRAKE SYSTEM .
Fig. 4: Connecting Pressure Gauges to LSPV (Pickup & Ram-50)
Courtesy of Mitsubishi Motor Sales of America.
Page 212 of 1333
5) Remove the LSPV load-sensing spring. Slowly depress the
brake pedal. Check the readings on the pressure gauges. Refer to the
LSPV PRESSURE SPECIFICATIONS table.
6) Install LSPV load-sensing spring. Load weight into rear of
vehicle until measured spring length distance is 7.0" (178 mm) with
lever slightly pressed in. See Fig. 1.
7) Slowly depress brake pedal. Check readings on pressure
gauges. See LSPV PRESSURE SPECIFICATIONS table. If fluid pressure is
not within specification, ensure all other brake system components are
okay. If other components are okay, replace LSPV assembly.
LSPV PRESSURE SPECIFICATIONS (PICKUP & RAM-50)
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Application Inlet Pressure Outlet Pressure
psi (kg/cm) psi (kg/cm)
Load-Sensing Spring
Removed ........... 853 (60) ......... 242-327 (17-23)
Installed ........ 1991 (140) .... ( 1) 299-583 (21-40)
( 1) - On vehicles with 2WD and heavy-duty suspension,
outlet pressure is 526-697 psi (37-49 kg/cm
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PROPORTIONING VALVE (NON-LOAD-SENSING) (MONTERO)
Pressure Test
1) Connect pressure gauges to input and output ports of the
proportioning valve. See Fig. 5. Bleed brake hydraulic system. Refer
to BLEEDING BRAKE SYSTEM .
2) Slowly depress brake pedal. Check readings on pressure
gauges. See the PROPORTIONING VALVE PRESSURE SPECIFICATIONS table. If
fluid pressures are not within specification, replace proportioning
valve.
Fig. 5: Connecting Pressure Gauges to Proportioning Valve (Typical)
Courtesy of Mitsubishi Motor Sales of America.
PROPORTIONING VALVE PRESSURE SPECIFICATIONS (MONTERO)
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Installation
To install, reverse removal procedure. Tighten wheel bearings
to 22 ft. lbs. (30 N.m). Loosen nut, and then retighten to 72 INCH
lbs. (8 N.m). Install cotter pin. If pin does not align, loosen nut up\
to a maximum of 30 degrees.
REAR BRAKE DRUM & SHOES
Removal
1) Raise and support vehicle. Remove wheel and brake drum.
Remove shoe return spring and brake shoe adjuster. See Fig. 8. Remove
adjusting spring, shoe retaining spring and shoe hold-down pins.
2) Remove shoe and lining assembly with parking brake lever.
Remove cable from parking lever. Remove parking brake lever snap ring,
and disengage lever from brake shoe.
Fig. 8: Exploded View of Rear Brake Assembly
Courtesy of Mitsubishi Motor Sales of America.
Installation
1) To install, reverse removal procedure. Apply Lubriplate to
backing plate bosses, adjuster assembly threads and parking brake
lever pin.
2) Set adjustment assembly so brake shoes lightly contact
brake drum. Depress brake pedal to center shoes, and check pedal
travel. Rotate brake drum to ensure free movement.
WHEEL CYLINDERS
Removal & Installation
Raise and support vehicle. Remove rear brake drum and shoes.
See REAR BRAKE DRUM & SHOES under REMOVAL & INSTALLATION. Remove wheel
cylinder and seal assembly. To install, reverse removal procedure.
Bleed brakes.
MASTER CYLINDER
Removal
Drain brake fluid from master cylinder. Remove sensor
connector (if equipped). Disconnect brake lines from master cylinder,
and install plugs to prevent brake fluid spillage. Remove master
cylinder from booster unit and separate reservoirs from housing (if
necessary).
Installation
To install, reverse removal procedure. Before installation,
check and adjust clearance between back of master cylinder piston and
power brake push rod. Refer to MASTER CYLINDER PUSH ROD under
ADJUSTMENTS. After installation, adjust the brake pedal height. Refer
to BRAKE PEDAL HEIGHT & FREE PLAY under ADJUSTMENTS. Bleed brake
system. See BLEEDING BRAKE SYSTEM .
Page 222 of 1333
CO M PU TE R R ELE A R N P R O CED URES
1991 M it s u bis h i M onte ro
GENERAL INFORMATION
Computer Relearn Procedures
All Models
* PLEASE READ THIS FIRST *
The following general procedures are to be used if
driveability problems are encountered after power loss or battery has
been disconnected. These procedures may provide an aid in eliminating
these problems.
To reduce the possibility of complaints, after any service
which requires battery power to be disconnected, vehicle should be
road tested.
COMPUTER RELEARN PROCEDURES
Vehicles equipped with engine or transmission computers may
require a relearn procedure after vehicle battery is disconnected.
Many vehicle computers memorize and store vehicle operation patterns
for optimum driveability and performance. When vehicle battery is
disconnected, this memory is lost. The computer will use default data
until new data from each key start is stored. As computer memorizes
vehicle operation for each new key start, driveability is restored.
Vehicle computers may memorize vehicles operation patterns for 40 of
more key starts.
Customers often complain of driveability problems during
relearn stage because vehicle acts differently then before being
serviced. Depending on type and make of vehicle and how it is
equipped, the following complaints (driveability problems) may exist:
* Harsh Or Poor Shift Quality
* Rough Or Unstable Idle
* Hesitation Or Stumble
* Rich Or Lean Running
* Poor Fuel Mileage
These symptoms and complaints should disappear after a number
of drive cycles have been memorized. To reduce the possibility of
complaints, after any service which requires battery power to be
disconnected, vehicle should be road tested. If a specific relearn
procedure is not available, the following procedure may be used:
Automatic Transmission
* Set parking brake, start engine in "P" or "N" position.
Warm-up vehicle to normal operating temperature or until
cooling fan cycles.
* Allow vehicle to idle for one minute in "N" position. Select
"D" and allow engine to idle for one minute.
* Accelerate at normal throttle position (20-50%) until vehicle
shifts into top gear.
* Cruise at light to medium throttle.
* Decelerate to a stop, allowing vehicle to downshift, and use
brakes normally.
* Process may be repeated as necessary.
Manual Transmission
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CRUIS E C O NTR O L S YSTE M
1991 M it s u bis h i M onte ro
1991-92 SAFETY EQUIPMENT
Mitsubishi Cruise Control Systems
Montero
DESCRIPTION & OPERATION
The cruise control system is electronically and vacuum
controlled. System components include a control unit, actuator, vacuum
pump, cruise control switch, clutch pedal switch, cruise indicator
light, diode, inhibitor switch (A/T), stoplight switch, vehicle speed
sensor and A/T control unit.
The system has self-diagnostic capability. When
self-diagnostic mode is activated, each switch and sensor is checked
for defects. When cruise control system has been cancelled without
using a normal cancel method, a code will be set and stored in control
unit. Codes can be retrieved to help determine which circuit is
malfunctioning.
PRELIMINARY INSPECTION
Before performing TROUBLE SHOOTING steps, inspect linkage
assembly, actuator, cables and vacuum hoses. Ensure linkage and cables
move smoothly. Ensure cables do not have excessive slack or tension.
TROUBLE SHOOTING
NOTE: For further trouble shooting information, see CHECK RESULTS
& SYMPTOM CHARTS. See Figs. 11-16.
SYSTEM CANCELS OR WILL NOT RESET AFTER CANCELLATION
1) Check trouble codes, see SELF-DIAGNOSTICS under DIAGNOSIS
& TESTING. If no trouble codes are stored, ensure cruise control can
be set.
2) If cruise control can be set, system may have cancelled
because of driving on steep hills or loose wiring connection. If
cruise control still cannot be set, perform SYSTEM INPUT TESTS under
DIAGNOSIS & TESTING.
3) On 1991 models, if SYSTEM INPUT TESTS check okay, check
actuator circuit. See TEST NO. 5 under CIRCUIT TESTS (1991). On 1992
models, if SYSTEM INPUT TESTS check okay, check vacuum pump circuit.
See TEST NO. 6 under CIRCUIT TESTS (1992). On all models, if SYSTEM
INPUT TESTS do not check okay, see INPUT CODE CHART. See Fig. 9 or 10.
ADJUSTMENTS
CRUISE CONTROL CABLE
1991
1) Ensure cruise control and accelerator cables are free of
bends and folds. Remove actuator cover. Loosen lock nuts and adjusting
nuts to free cables. Adjust accelerator cable "A" to correct
dimension. See Fig. 1 or 2.
2) Tighten lock nuts. Loosen adjustment bolts on intake air
plenum. Adjust plate so that inner cable free play is .04-.08" (1-2
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CRUISE CONTROL SWITCH FUNCTION TEST
NOTE: If vehicle speed decreases approximately 9 MPH below set
speed, set speed will be cancelled.
1) Cruise control switch is part of multifunction switch
mounted on steering column. To operate cruise control system, turn
ignition on. Turn cruise control switch to ON position. Ensure switch
indicator light comes on.
NOTE: Speed will not set beyond system limit of 90 MPH.
2) With cruise control switch in ON position, drive vehicle
between 25 and 90 MPH. Press and release SET button. Vehicle speed
should stay at set speed. Instrument cluster cruise indicator light
should come on. To increase set speed, turn control switch to RESUME
position and hold until new set speed is reached.
3) To lower set speed, press SET button and hold until new
set speed is reached. To return to set speed after cancellation, move
resume switch from ON to OFF position. Vehicle speed should return to
previous setting before cancellation. Set speed should cancel when any
of the following occurs:
* Brake pedal is pressed.
* Clutch pedal is pressed.
* Transmission is shifted to Neutral or Park.
* Cruise control main switch is turned off.
* Ignition switch is turned off.
SELF-DIAGNOSTICS
1) Self-diagnostics should be performed when cruise control
cancels without the driver using normal cancel modes. Diagnosis
connector is located on right side of fuse box. Use analog voltmeter
or Multi-Use Tester (MB991341) for code retrieval.
2) Use multi-use tester according to operating instructions
provided with tester. Connect leads of analog voltmeter between cruise
control terminal and ground terminal of self-diagnostic connector. See
Fig. 6 . Read voltmeter needle sweeps to determine trouble code.
NOTE: On 1991 models, codes No. 13, 14, 15, 16 and 17 will be
displayed whether malfunction is present or not.
3) Once trouble codes have been displayed, see SELF-
DIAGNOSTIC CODE CHART to determine appropriate CIRCUIT TEST. See
Fig. 7 or 8.
4) To clear trouble codes, either disconnect battery cable or
turn ignition on. Turn main cruise control switch and set switch to ON
position. Within one second turn resume switch to ON position.
5) Hold stoplight switch and cruise control switch in ON
position for more than 5 seconds. Verify codes are cleared.
Fig. 6: Identifying Self-Diagnostic Connector Terminals
Courtesy of Mitsubishi Motor Co.
Page 239 of 1333
Test No. 1 (Power & Ground Circuit)
1) Turn ignition on. When cruise control main switch is
turned to ON position, battery voltage should be present on terminal
No. 7 of cruise control unit connector.
2) If voltage is not present, check fuse No. 3 and replace as
necessary. If fuse is okay, check and repair harness as necessary.
Terminal No. 10 should be grounded at all times. If terminal No. 10 is
not grounded, repair harness.
Test No. 2 (Set Switch Circuits)
When set switch is turned to ON position, voltage should not
be present on terminal No. 5 of cruise control unit. When set switch
is turned to OFF position, battery voltage should be present on
terminal No. 5 of cruise control unit. If circuit does not test
correctly, replace switch as necessary or repair harness.
Test No. 3 (Resume Switch Circuit)
When resume switch is turned to ON position, voltage should
not be present on terminal No. 4 of cruise control unit. When resume
switch is turned to OFF position, battery voltage should be present on
terminal No. 4 of cruise control unit. If circuit does not test
correctly, replace switch as necessary or repair harness.
Test No. 4 (Vehicle Speed Sensor Circuit)
When vehicle moves slowly, voltage should alternate from zero
volts to 3-5 volts at terminal No. 15 of cruise control unit. If
circuit does not test correctly, replace sensor as necessary or repair
harness.
Test No. 5 (Actuator Circuit)
1) When cruise control main switch is in On position, voltage
should not be present on terminal No. 8 of cruise control unit.
2) When vehicle is accelerated using resume switch, voltage
should not be present on terminal No. 9 of cruise control unit. When
vehicle is coasting by using set switch, battery voltage should be
present on terminal No. 9.
3) When vehicle is accelerated using resume switch, battery
voltage should be present on terminal No. 20 of cruise control unit.
When vehicle is coasting by using set switch, voltage should not be
present on terminal No. 20 of cruise control unit. If circuit does not
test correctly, replace actuator as necessary or repair harness.
Test No. 6 (Stoplight Switch Circuit)
1) When brake pedal is pressed, battery voltage should be
present on terminal No. 3 of cruise control unit. If voltage is not
present, adjust or replace brake switch.
2) Battery voltage should be present at all times on terminal
No. 11 of cruise control unit. If voltage is not present, check fuse
no. 7. If fuse is okay, repair harness.
Test No. 7 (Inhibitor Switch Circuit)
1) When gear shift lever is moved to Neutral or Park
position, voltage should not be present on terminal No. 2 of cruise
control unit.
2) When gear shift lever is moved to any other position,
battery voltage should be present on terminal No. 2 of cruise control
unit. If circuit does not test correctly, replace switch as necessary
or repair harness.
Test No. 8 (Clutch Switch Circuit)
When clutch pedal is pressed, battery voltage should be
present at terminal No. 1 of cruise control unit. If circuit does not