1991 MITSUBISHI MONTERO check engine

Calibration Test
Adjust tire pressure to standard value. Using a calibrated,
reliable speedometer tester, compare reading of vehicle speedometer to
speedometer tester. See SPEEDOMETER ALLOWABLE VARIATION table. Replace
speedometer if necessary.
SPEEDOMETER ALLOWABLE VARIATION TABLE









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MPH (km/h) Allowable Variation MPH (km/h)
20 (32) .......................... 19-22 (31-35)
40 (64) .......................... 38-44 (61-71)
60 (97) ......................... 57-66 (92-106)
80 (129) ....................... 76-88 (122-142)
100 (161) ..................... 94-110 (151-177)









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TACHOMETER
NOTE: DO NOT reverse polarity when installing tachometer, as diode
and transistor may be damaged.
Calibration Test
Connect a calibrated, reliable tach-dwell meter to vehicle
ignition system. Operate engine at various speeds (RPM). See
TACHOMETER ALLOWABLE VARIATION table. If comparison between tach-dwell
meter and vehicle tachometer readings do not fall in the standard
range of permissible variation, replace vehicle tachometer.
TACHOMETER ALLOWABLE VARIATION TABLE









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Engine Speed (RPM) Allowable Variation (RPM)
1000 .................................. 900-1100
3000 ................................. 2850-3150
5000 ................................. 4750-5250
6000 ................................. 5700-6300









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TEMPERATURE GAUGE
CAUTION: DO NOT connect sender wire directly to ground during test.
Circuit Test
Disconnect temperature sender wire from sending unit. Connect
a 12-volt, 3.4-watt test bulb between connector terminal and ground.
Turn ignition switch to ON position. If test bulb flashes and
temperature gauge needle moves, go to SENSOR RESISTANCE TEST. If test
light does not flash and gauge needle does not move, repair wiring to
sending unit.
Sensor Resistance Test
Remove thermosensor (sending unit) from engine block. Place
sending unit in hot water of 158
F (70C) temperature. Check sensor
resistance with an ohmmeter. Thermosensor resistance should be 90-117
ohms at 158
F (70C). If thermosensor resistance in okay, go to GAUGE
RESISTANCE TEST. Replace thermosensor if resistance is not as
specified.
Gauge Resistance Test
Remove instrument cluster from instrument panel. See
INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. Measure resistance
between temperature gauge terminals at rear of cluster or combination

NOTE: When routing speedometer cable, DO NOT bend cable sharply.
Minimum bending radius is 6" (150 mm). Speedometer cable
length varies with transmission type.
Removal
Disconnect speedometer cable from transmission or transaxle.
Remove instrument cluster from instrument panel. See
INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. Disconnect
speedometer cable from instrument cluster and/or adapter (if
equipped). Remove speedometer cable from firewall grommet.
Installation
Install new cable. Insert cable until stopper seats properly
in groove on rear of speedometer housing. Pull speedometer cable
through firewall grommet until cable marking is visible from engine
compartment. Install adapter onto speedometer cable (if equipped).
Install instrument cluster. See INSTRUMENT CLUSTER under REMOVAL &
INSTALLATION. Install cable onto transmission or transaxle. Check for
proper operation.
NOTE: An improperly installed cable can cause fluctuating meter,
noise or damaged harness inside instrument panel.
WIRING DIAGRAMS
See appropriate chassis wiring diagram in the WIRING DIAGRAMS
Section.

IN TE R FE R EN CE V ER IF IC ATIO N C HEC K F O R O HC E N G IN E
1991 Mitsubishi Montero
Maintenance & Service Information
1983-96 Mitsubishi - Timing Belt Information
Cordia, Diamante, Eclipse, Expo, Expo LRV, Galant, Mirage,
Montero, Pickup, Precis, Sigma, Tredia, Van, 3000GT
TIMING BELT INTERFERENCE VERIFICATION INFORMATION
TIMING BELT INTERFERENCE CAUTION
NOTE: CAMSHAFT DRIVE BELTS OR TIMING BELTS - The condition of
camshaft drive belts should always be checked on vehicles
which have more than 50,000 miles. Although some
manufacturers do not recommend replacement at a specified
mileage, others require it at 60,000-100,000 miles. A
camshaft drive belt failure may cause extensive damage to
internal engine components on most engines, although some
designs do not allow piston-to-valve contact. These designs
are often called "Free Wheeling". Many manufacturers changed
their maintenance and warranty schedules in the mid-1980's to
reflect timing belt inspection and/or replacement at
50,000-60,000 miles. Most service interval schedules shown in
this section reflect these changes. Belts or components
should be inspected and replaced if any of the following
conditions exist:
* Crack Or Tears In Belt Surface
* Missing, Damaged, Cracked Or Rounded Teeth
* Oil Contamination
* Damaged Or Faulty Tensioners
* Incorrect Tension Adjustment
TIMING BELT INTERFERENCE CHECK MENU
TIMING BELT INTERFERENCE VERIFICATION TABLE ( 1)








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Replacement Interval
Application Engine (Miles)
Passenger Cars
Cordia
1983-88 .......... 1.8L 4-Cyl. ............ ( 4) 60,000
2.0L 4-Cyl. ............ ( 4) 60,000
Diamante
1992-96 ...... ( 2) 3.0L V6 (DOHC) ............. 60,000
3.0L V6 (SOHC) ........... ( 4) 60,000
Eclipse
1990-94 .......... 1.8L 4-Cyl. ............ ( 4) 60,000
1990-95 ....... ( 2) 2.0L 4-Cyl. ........... ( 4) 60,000
1990-94 ... ( 2) 2.0L 4-Cyl. Non-Turbo ..... ( 4) 60,000
1990-96 ..... ( 2) 2.0L 4-Cyl. Turbo ....... ( 4) 60,000
1996 ........... ( 2) 2.4L 4-Cyl. .......... ( 4) 60,000
Expo
1992-95 .......... 1.8L 4-Cyl. ................ 60,000
( 2) 2.4L 4-Cyl. .......... ( 4) 60,000
Expo LRV
1995 ............. 1.8L 4-Cyl. ................ 60,000
( 2) 2.4L 4-Cyl. .......... ( 4) 60,000
Galant

1985-87 ........ (2) 2.4L 4-Cyl. .......... ( 4) 60,000
1988 ............... 3.0L V6 .............. ( 3) 60,000
1989-93 .... ( 2) 2.0L 4-Cyl. (DOHC) ....... ( 4) 60,000
2.0L 4-Cyl. (SOHC) ........ ( 4) 60,000
1994-96 .... ( 2) 2.4L 4-Cyl. (DOHC) ....... ( 4) 60,000
2.4L 4-Cyl. (SOHC) ........ ( 4) 60,000
Mirage
1985-96 ........ ( 2) 1.5L 4-Cyl. .............. 60,000
1985-88 ..... ( 2) 1.6L 4-Cyl. Turbo ........... 60,000
1989, 1991 ..... ( 2) 1.6L 4-Cyl. .............. 60,000
1993-96 ........... 1.8L 4-Cyl ................ 60,000
Precis
1987-93 ........ ( 2) 1.5L 4-Cyl. .............. 60,000
Sigma
1989-90 ............ 3.0L V6 .............. ( 3) 60,000
Tredia
1983-88 .......... 1.8L 4-Cyl. ............ ( 4) 60,000
2.0L 4-Cyl. ............ ( 4) 60,000
3000GT
1991-96 .......... ( 2) 3.0L V6 ................ 60,000
Light Trucks
Montero
1985-96 ............ 3.0L V6 .............. ( 3) 60,000
1994-96 ............ 3.5L V6 .............. ( 3) 60,000
Pickup
1983-89 ........... 2.0L 4-Cyl. ........... ( 3) 60,000
1983-86 ... ( 2) 2.3L 4-Cyl. Turbo Diesel .. ( 4) 60,000
1990-96 ........... 2.4L 4-Cyl. ........... ( 4) 60,000
3.0L V6 .............. ( 3) 60,000
Van
1987-90 ........... 2.4L 4-Cyl. ........... ( 4) 60,000
( 1) - Other interference engine applications may exist which
are not indicated here.
( 2) - Interference engine. Check for possible damage to
piston(s) or valve(s) if there has been a timing belt
failure.
( 3) - Although the vehicle manufacturer does not recommend a
specific scheduled maintenance interval, aftermarket
belt manufacturers suggest the belt be replaced at
60,000 mile intervals.
( 4) - Vehicle manufacturer recommends replacing all belts at
the same time.









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4 * High
5 * Premium
7 - Body Type
1 * 5-Door Wagon
2 * 2-Door Canvas Top
3 * 2-Door Metal Top (1983-86)
3 * 3-Door Metal Top Or Van (1987 & Newer Models)
8 - Engine Type
E * 2.6L 4-Cylinder
H * 3.0L V6
M * 3.5L V6
S * 3.0L V6
7 * 2.6L 4-Cylinder (1983)
9 - VIN Check Digit
* 1 Through 9 Or X
10 - Vehicle Model Year
D * 1983
E * 1984
F * 1985
G * 1986
H * 1987
J * 1988
K * 1989
L * 1990
M * 1991
N * 1992
P * 1993
R * 1994
S * 1995
T * 1996
11 - Assembly Plant
Y * Ohye, Japan (1983)
Y * Nagoya, Japan (1984)
J * Nagoya, Japan (1985-96)
12 - Transmission Code (1983-85)
4 * 5-Speed M/T (1984-85 Federal Vehicles)
5 * 5-Speed M/T (1984-85 California Vehicles)
7 * 5-Speed M/T (1983 Federal Vehicles)
7 * A/T (1984-85 Federal Vehicles)
8 * A/T (1984-85 California Vehicles)
12-17 - Serial Number (1986-96)
* Sequential Production Number
13-17 - Serial Number (1983-85)
* Sequential Production Number
MAINTENANCE SERVICE INFORMATION
SEVERE & NORMAL SERVICE DEFINITIONS
NOTE: Use the Severe Service schedule if the vehicle to be serviced
is operated under ANY (one or more) of these conditions:
Service is recommended at mileage intervals based on vehicle
operation. Service schedules are based on the following primary

operating conditions.
Normal Service
* Driven More Than 10 Miles Daily
* No Operating Conditions From Severe Service Schedule
Severe Service (Unique Driving Conditions)
* Short Trips In Freezing Temperatures
* Towing Or Commercial Use
* Driving Off-Road Or In Salty Or Sandy Areas
* Severe Dust Conditions
* Hot Weather, Stop-And-Go Driving
* Extensive Idling
CAMSHAFT TIMING BELT
CAUTION: Failure to replace a faulty camshaft timing belt may result
in serious engine damage.
The condition of camshaft drive belts should always be
checked on vehicles which have more than 50,000 miles. Although some
manufacturers do not recommend belt replacement at a specified
mileage, others require it at 60,000-100,000 miles. A camshaft drive
belt failure may cause extensive damage to internal engine components
on most engines, although some designs do not allow piston-to-valve
contact. These designs are often called "Free Wheeling".
Many manufacturers changed their maintenance and warranty
schedules in the mid-1980's to reflect timing belt inspection and/or
replacement at 50,000-60,000 miles. Most service interval schedules in
this manual reflect these changes.
Belts or components should be inspected and replaced if any
of the following conditions exist:
* Cracks Or Tears In Belt Surface
* Missing, Damaged, Cracked Or Rounded Teeth
* Oil Contamination
* Damaged Or Faulty Tensioners
* Incorrect Tension Adjustment
Replace camshaft timing belt at 60,000 mile intervals.
SERVICE POINT LOCATIONS
Fig. 1: Service Point Locations (1983-86 2.6L 4-Cylinder Engine)
Courtesy of Mitsubishi Motor Sales of America.

2.6L Engine ........................................... 45
2.6L Optional ......................................... 45
3.0L V6 ........................................... (1) 24
3.5L V6 ........................................... ( 1) 24
( 1) - Check hood clearance on 1986 and newer models.









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CAUTIONS & WARNINGS
SUPPLEMENTAL RESTRAINT SYSTEM (SRS) AIR BAG SYSTEM
NOTE: See the AIR BAG RESTRAINT SYSTEM article in the
ACCESSORIES/SAFETY EQUIPMENT Section.
The SRS has no user-servicable parts. Always have servicing
done by an authorized dealer.
When performing maintenance on air bag equipped vehicles
always observe proper safety precautions.
WARNING: To avoid injury from accidental air bag deployment, read and
carefully follow all warnings and service precautions. See
appropriate AIR BAG RESTRAINT SYSTEM article in the
ACCESSORIES/SAFETY EQUIPMENT section.
CAUTION: Disconnect negative battery cable before servicing any air
bag system, steering column or passenger side dash
component. After any repair, turn ignition key to the ON
position from passenger's side of vehicle in case of
accidental air bag inflation
ANTI-LOCK BRAKE SYSTEM (ABS)
CAUTION: Never mix different diameter tires. On loose or uneven
surfaces, the ABS system may require longer stopping
distances than conventional brake systems. Exercise caution
when removing mud or snow from the wheels so as not to
damage the ABS wiring or speed sensors.
BATTERY WARNING
WARNING: When battery is disconnected, vehicles equipped with
computers may lose memory data. When battery power is
restored, driveability problems may exist on some vehicles.
These vehicles may require a relearn procedure. See
appropriate COMPUTER RELEARN PROCEDURES article in the
GENERAL INFORMATION section below.
REPLACING BLOWN FUSES
Before replacing a blown fuse, remove ignition key, turn off
all lights and accessories to avoid damaging the electrical system. Be
sure to use fuse with the correct indicated amperage rating. The use
of an incorrect amperage rating fuse may result in a dangerous
electrical system overload.
BRAKE PAD WEAR INDICATOR
Indicator will cause a squealing or scraping noise, warning
that brake pads need replacement.

Installation
1) To install, reverse removal procedure. Injectors may be
removed after fuel rail is removed from intake manifold. Use new
insulators and "O" rings when installing injectors.
2) Use spindle oil or gasoline on "O" ring. Install injectors
into fuel rail with a twisting motion. Adjust throttle and kickdown
cable (if applicable). Do not drop injectors while removing or
installing fuel rail.
OXYGEN (O2) SENSOR
Removal & Installation
1) O2 Sensor is mounted in exhaust pipe below exhaust header.
It is equipped with a permanent pigtail which must be protected from
damage when sensor is removed. Ensure sensor is free of contaminants,
avoid using cleaning solvents of any type. Sensor may be difficult to
remove when engine temperature is less than 120
F (48 C).
2) Always use anti-seize compound on threads before
installation. On non-turbo models, remove sensor using Remover
(MD998703). On turbo models, use Remover (MD998748) on Eclipse and
Galant, or Remover (MD998770) on Stealth and 3000GT. Tighten oxygen
sensor to specification. See TORQUE SPECIFICATIONS table.
THROTTLE BODY
Removal
Disconnect air intake hose. Remove accelerator and automatic
speed control cables (if equipped). Disconnect fuel vapor hose,
electrical harness connector, vacuum hose and coolant hoses. Remove
throttle body retaining bolts.
Disassembly
Remove throttle position sensor. Remove idle speed control
motor. Remove throttle bracket and connector bracket (if equipped).
Remove idle position switch and adjusting nut.
NOTE: DO NOT remove throttle valve. DO NOT use cleaning solvents
on throttle position sensor, idle speed control motor or
idle position switch.
Cleaning
Clean all parts except those noted in solvent. Check vacuum
port and passage for clogging. Clean vacuum, vapor and fuel passages
with compressed air.
Reassembly
To reassemble, reverse disassembly procedure.
Installation
To install, reverse removal procedure.
THROTTLE POSITION SENSOR/SWITCH
Removal & Installation
Throttle position sensor/switch is located on throttle body.
Disconnect TPS electrical connector. Remove bolts holding TPS and
remove TPS. To install, reverse removal procedure. Tighten throttle
position sensor/switch to specification. See TORQUE SPECIFICATIONS
table. For adjustment procedure, see ON-VEHICLE ADJUSTMENTS article.
TURBOCHARGERS