1998 MITSUBISHI MONTERO light
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![MITSUBISHI MONTERO 1998 Service Manual \
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g grams")
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g grams
GND or GRND Ground
GRN Green
GRY Gray
Ga. Gauge
Gals. gallons
Gov. Governor
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"H" ABBREVIATION TABLE
"H" ABBREVIATION TABLE \
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ABBREVIATION DEFINITION
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H/D Heavy Duty
HAC High Altitude Compensation
HC Hydrocarbons
HEDF High Speed Electro Drive Fan relay or circuit
HEGO Heated Exhaust Gas Oxygen Sensor
HEGOG HEGO Ground circuit
HEI High Energy Ignition
HLDT Headlight
HO High Output
HP High Performance
HSC High Swirl Combustion
HSO High Specific Output
HTR Heater
HVAC Heating
Headlt. Headlight
Hg Mercury
Hgt. Height
Htr. Heater
Hz Hertz (Cycles Per Second)
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"I" ABBREVIATION TABLE
"I" ABBREVIATION TABLE \
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ABBREVIATION DEFINITION
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I.D. Inside Diameter
IAC Idle Air Control
IACV Idle Air Control Valve
IC Integrated Circuit
ID Identification
IDM Ignition Diagnostic Monitor
IGN Ignition system or circuit
ILC Idle Load Compensator
In. Hg Inches of Mercury
INCH Lbs. Inch Pounds
INFL REST Inflatable Restraint
INJ Injector or Injection
IP Instrument Panel
IPC Instrument Panel Cluster
ISA Idle Speed Actuator
ISC Idle Speed Control
ISS Idle Stop Solenoid
ITS Idle Tracking Switch
IVSV Idle Vacuum Switching Valve
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Ign. Ignition
In. Inches
Inj. Injector
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"J" ABBREVIATION TABLE
"J" ABBREVIATION TABLE \
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ABBREVIATION DEFINITION
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J/B Junction Block
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"K" ABBREVIATION TABLE
"K" ABBREVIATION TABLE \
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ABBREVIATION DEFINITION
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k/ohms 1000 ohms (kilo as in k/ohms)
kg Kilograms (weight)
kg/cm Kilograms Per Square Centimeter
KAM Keep Alive Memory
KAPWR Keep Alive Power
KM/H Kilometers Per Hour
KOEO Key On Engine Off
KOER Key On Engine Running
KS Knock Sensor
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"L" ABBREVIATION TABLE
"L" ABBREVIATION TABLE \
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ABBREVIATION DEFINITION
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L Liter(s)
L/D Light Duty
LCD Liquid Crystal Display
LED Light Emitting Diode
LH Left Hand
LOS Limited Operation Strategy
LT BLU Light Blue
LT GRN Light Green
LUS Lock-Up Solenoid
Lbs. Pounds
Lt(s). Light(s)
Lugg. Luggage
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"M" ABBREVIATION TABLE
"M" ABBREVIATION TABLE \
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ABBREVIATION DEFINITION
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mA Milliamps
mV Millivolts
mfd. Microfarads
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mm Millimeters
M/T Manual Transaxle or Transmission
MA PFI Mass Air Sequential Port Fuel Injection system
MA or MAF Mass Airflow
MAF Mass Air Flow sensor
MAFS Mass Airflow Sensor
MAP Manifold Absolute Pressure sensor
MAT Manifold Air Temperature
MCU Microprocessor Control Unit
MCV Mixture Control Valve
MEM-CAL Memory Calibration Chip
MFI Multiport Fuel Injection
MIL Malfunction Indicator Light
MLP Manual Lever Position
MPFI Multi Point Fuel Injection
MPH Miles Per Hour
MPI Multi-Point (Fuel) Injection
Man. Manual
Mech. Mechanical
Mem. Memory
Mtr. Motor
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"N" ABBREVIATION TABLE
"N" ABBREVIATION TABLE \
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ABBREVIATION DEFINITION
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N.m Newton-Meter
NA Not Available
NDS Neutral Drive Switch
NGS Neutral Gear Switch
NOx Oxides of Nitrogen
NPS Neutral Pressure Switch
No. Number
Nos. Numbers
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"O" ABBREVIATION TABLE
"O" ABBREVIATION TABLE \
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ABBREVIATION DEFINITION
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O Oxygen
O.D. Outside Diameter
O/S Oversize
O2 Oxygen
OC Oxidation Catalyst
OCC Output Circuit Check
OD Overdrive
ODO Odometer
OHC Overhead Camshaft
ORG Orange
OSC Output State Check
Opt. Option or Optional
oz. Ounce
ozs. Ounces
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RVB Rear Vacuum Break
RWAL Rear Wheel Anti-Lock Brake
RWD Rear Wheel Drive
Recirc. Recirculate or Recirculation
Reg. Regulator
Rly. Relay
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"S" ABBREVIATION TABLE
"S" ABBREVIATION TABLE \
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ABBREVIATION DEFINITION
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SAW Spark Angle Word
SBC Single Bed Converter
SBEC Single Board Engine Controller
SC Super Charged
SCC Spark Control Computer
SCS Air Suction Control Solenoid
SDM Supplemental Restraint System Diagnostic Module
SDU SRS Diagnostic Unit
SEN Sensor
SES Service Engine Soon
SFI Sequential (Port) Fuel Injection
SIG RTN Signal Return circuit
SIL Shift Indicator Light
SIR Supplemental Inflatable Restraint
SMEC Single Module Engine Controller
SOHC Single Overhead Cam
SOL or Sol. Solenoid
SPFI Sequential Port Fuel Injection
SPK Spark Control
SPOUT Spark Output Signal
SRS Supplemental Restraint System (Air Bag)
SS 3/4-4/3 Shift Solenoid circuit
SSI Solid State Ignition
STAR Self-Test Automatic Readout
STI Self Test Input circuit
STO Self-Test Output
SUB-O2 Sub Oxygen Sensor
Sen. or Sens. Sensor
Sol. Solenoid
Sprchg. Supercharger
Strg. Steering
Susp. Suspension
Sw. Switch
Sys. System
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"T" ABBREVIATION TABLE
"T" ABBREVIATION TABLE \
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ABBREVIATION DEFINITION
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T.V. Throttle Valve
TAB Thermactor Air By-Pass
TAC Thermostatic Air Cleaner
TAD Thermactor Air Diverter
TAN Tan
TBI Throttle Body Injection
Page 84 of 1501
A/C-HEATER SYSTEM
1998 Mitsubishi Montero
1998 AIR CONDITIONING & HEAT
Mitsubishi - A/C-Heater System
Montero
* PLEASE READ THIS FIRST *
WARNING: To avoid injury from accidental air bag deployment, read and
carefully follow all SERVICE PRECAUTIONS and DISABLING &
ACTIVATING AIR BAG SYSTEM procedures in AIR BAG RESTRAINT
SYSTEM article.
A/C SYSTEM SPECIFICATIONS
A/C SYSTEM SPECIFICATIONS TABLE \
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Application Specification
Compressor Type ............... Nippondenso 10PA15 10-Cyl.
Compressor Belt Deflection ( 1)
New .......................... 13/64-15/64" (5.1-6.0 mm)
Used ......................... 17/64-19/64" (6.6-7.5 mm)
Compressor Oil Capacity ..................... ( 2) 2.7 ozs.
Refrigerant (R-134a) Capacity ................. 21-23 ozs.
System Operating Pressures ( 4)
High Side ............... 149-213 psi (10.5-15.0 kg/cm
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Low Side .................... 14-33 psi (1.0-2.3 kg/cm)
( 1) - With 22 lbs. (100 N.m) force applied midway on longest
span of belt.
( 2) - Use ND 8-OIL refrigerant oil.
( 3) - Use SUN PAG 56 refrigerant oil.
( 4) - With ambient temperature at about 80
F (27C). \
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DESCRIPTION
Slight variations exist among manual A/C-heater systems used.
On Montero, a Nippondenso 10-cylinder compressor is used. Cycling of
compressor clutch is controlled by an automatic A/C Control Unit
(ACCU).
Compressors will only operate within normal temperatures and
pressures set for each model. An electric condenser fan operates
whenever A/C system is operating. System components may vary depending
upon model. Systems may include an ACCU, fan switch, evaporator,
temperature sensor, dual-pressure switch, engine coolant temperature
switch, compressor, condenser, receiver-drier and various pipes and
hoses.
OPERATION
A/C CONTROL UNIT (ACCU)
ACCU controls cycling of compressor clutch based on
information received from air thermosensor and air inlet sensor, dual-
pressure switch, A/C switch and A/C engine coolant temperature switch.
ACCU is attached to top of evaporator housing.
Page 85 of 1501
A/C SWITCH
When turned on, the A/C system will operate if blower motor
control lever is in a position other than OFF. When activated, A/C
switch allows A/C compressor clutch to engage and operate the
compressor.
A/C ENGINE COOLANT TEMPERATURE SWITCH
The A/C engine coolant temperature switch, located on
thermostat housing, is wired in series with compressor clutch. When
coolant temperature is greater than switch control temperature, power
to compressor is cut and compressor is turned off until temperature
returns to operating range. Switch will turn on at 226
F (108C) and
off at 235-243F (112-118C).
AIR SELECTOR LEVER
The lever moves horizontally to select source of air used
inside passenger compartment. Lever moves from position on left
(outside air mode) to position on right (recirculated air mode). Lev\
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should be set in recirculated air mode for maximum A/C cooling.
BLOWER MOTOR CONTROL SWITCH
Blower motor control switch rotates to select blower motor
speeds. As switch is rotated from left or OFF position, increasing
speeds of blower operation are selected. In order for A/C system to
operate, blower motor control switch must be in a position other than
OFF.
MODE SELECTOR KNOB
Mode selector knob has six modes available to achieve desired
distribution of air from various outlets. When knob is rotated fully
to left (counterclockwise), airflow is directed to upper passenger
area. In second position (clockwise), airflow is directed to upper
passenger area and slightly to leg area. Position 3, directs air
mostly to leg area and slightly to upper passenger area. Position 4,
directs air exclusively to leg area. Position 5, directs air to leg
area and to windshield and door windows. Position 6, directs air
exclusively to windshield and door windows.
TEMPERATURE CONTROL KNOB
Temperature control knob operates blend-air door in
heater/air conditioning unit, mixing cooled and heated air so that
selected air temperature can be obtained. The system will provide
cooled air when A/C switch is in ON position and blower motor is in
any position other than OFF. Temperature control knob should be on far
left (maximum cooling) side of temperature selection scale when
maximum A/C cooling is desired.
DUAL-PRESSURE SWITCH
The dual-pressure switch, mounted on receiver-drier, is wired
in series with compressor clutch. Whenever system pressures drop below
or increase above control points of switch, power supplied to
compressor will be cut and compressor function will cease until
pressures are back to normal operating ranges.
Page 86 of 1501
ADJUSTMENTS
NOTE: For adjustment procedures, see HEATER SYSTEM article.
TROUBLE SHOOTING
NO COOLING
1) Ensure compressor clutch is operating. If compressor
clutch is operating, go to next step. If compressor clutch is not
operating, check fuses and A/C switch. Check dual-pressure switch.
Check air inlet sensor and air thermosensor. Check A/C compressor
relay. Check A/C compressor clutch coil. Check A/C control unit.
2) Ensure system is properly charged with correct amount of
refrigerant. Evacuate and charge system as necessary. Ensure receiver-
drier is not clogged. Check compressor belt for proper tension. Check
for clogged expansion valve. Check compressor operation. Repair or
replace components as necessary.
INSUFFICIENT AIRFLOW
Check for air leakage at air duct joint. Check for frost on
evaporator. Ensure blower motor is operating properly. Check for
obstructed air intake.
INSUFFICIENT COOLING
Ensure system is properly charged with correct amount of
refrigerant and free of air and moisture. Evacuate and charge system
as necessary. Ensure receiver-drier is not clogged. Ensure sufficient
airflow through condenser exists. Check compressor belt for proper
tension. Check compressor operation. Repair or replace compressor as
necessary. Check for clogged expansion valve. Replace expansion valve
as necessary. Check A/C compressor clutch coil.
INTERMITTENT COOL AIR
Check for air or moisture in system. Evacuate and charge
system as necessary. Check for expansion valve malfunction. Replace
expansion valve if necessary. Check compressor belt for proper
tension.
TESTING
* PLEASE READ THIS FIRST *
WARNING: To avoid injury from accidental air bag deployment, read and
carefully follow all SERVICE PRECAUTIONS and DISABLING &
ACTIVATING AIR BAG SYSTEM procedures in AIR BAG RESTRAINT
SYSTEM article.
NOTE: For testing procedures not covered in this article, see
HEATER SYSTEM article.
A/C SYSTEM PERFORMANCE
1) Park vehicle out of direct sunlight. Install A/C gauge
set. Start engine and allow it to idle at 1000 RPM. Turn A/C on. Set
A/C controls to recirculated air, panel (vent) mode and full cold
Page 102 of 1501
Transportation (DOT) approved, DOT 4BW or DOT 4BA refrigerant
containers.
7) Never overfill refrigerant containers. The safe filling
level of a refrigerant container MUST NOT exceed 60 percent of the
container's gross weight rating. Store refrigerant containers at
temperature less than 125
F (52C).
8) R-134a refrigerant is sold and stored in 30- or 50-pound
Light Blue containers, while Freon (R-12) is stored in White colored
containers.
9) Refrigerant R-12 and R-134a must never be mixed, as they
and their desiccants and lubricants are not compatible. If
refrigerants are mixed, system cross-contamination or A/C system
component failure may occur. Always use separate servicing and
refrigerant recovery/recycling equipment.
10) Follow equipment manufacturer instructions of all service
equipment to be used. The Material Safety Data Sheet (MSDS), provided
by refrigerant manufacturer/suppliers, contains valuable information
regarding the safe handling of refrigerants.
11) Before connecting refrigerant lines always lubricate "O"
rings using appropriate refrigerant oil.
12) Always plug or cap A/C system refrigerant lines and
component connections as soon as possible to protect components from
moisture and/or dust. DO NOT remove plugs or caps until ready to
install component.
13) Always use a back-up wrench when tightening or loosening
fittings.
IDENTIFYING R-134a SYSTEMS & COMPONENTS
To prevent refrigerant cross-contamination, use following
methods to identify R-134a based systems and components.
Fittings & "O" Rings
All R-134a based A/C systems use 1/2" - 16ACME threaded
fittings (identifiable by square threads) and quick-connect service
couplings. See Fig. 1. Besides the use of these fittings, most
manufacturers will use Green colored "O" rings in R-134a systems.
Fig. 1: Identifying R-134a Fittings & Quick-Connect Service Couplings
Courtesy of Audi of America, Inc.
Underhood A/C Specification Labels
Most R-134a based systems will be identified through the use