sensor MITSUBISHI MONTERO 1991 User Guide

1) Disconnect sensor connector at evaporator case. Using an
ohmmeter, measure continuity between sensor terminals. See AIR THERMO
& AIR INLET SENSORS SPECIFICATIONS table.
2) If resistance is not within specifications, sensor is
faulty and must be replaced. If resistance is within specifications
and all other components are okay, replace A/C compressor control unit
(if equipped).
AIR THERMO & AIR INLET SENSORS SPECIFICATIONS TABLE









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Sensor Temperature Ohms
Air Thermo Sensor
32
F (0C) .................................. 11,400
50F (10C) ................................... 7320
68F (20C) ................................... 4860
86F (30C) ................................... 3310
104F (40C) .................................. 2320
Air Inlet Sensor
32
F (0C) .................................... 3310
50F (10C) ................................... 2000
68F (20C) ................................... 1250
86F (30C) .................................... 810
104F (40C) .................................... 530








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BLOWER RESISTOR
Disconnect blower resistor connector. Using an ohmmeter,
measure resistance between terminals indicated in BLOWER RESISTOR
RESISTANCE table. See Fig. 5.
BLOWER RESISTOR RESISTANCE TABLE









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Terminal Ohms
Colt Vista
1 & 2 ................................ Approx. 1.22
1 & 3 ................................ Approx. 0.41
1 & 4 ................................ Approx. 2.65
1 & 5 ................................... Approx. 0
Montero (Front)
1 & 2 ................................ Approx. 1.22
1 & 3 ................................ Approx. 0.41
1 & 4 ................................ Approx. 2.25
1 & 5 ................................... Approx. 0
Montero (Rear)
2 & 4 ................................. Approx. 0.5
1 & 4 ................................. Approx. 1.8
3 & 4 ................................. Approx. 3.3
Pickup & Ram-50
1 & 2 ................................ Approx. 1.19
1 & 3 ................................ Approx. 0.50
1 & 4 ................................ Approx. 2.33
1 & 5 ................................... Approx. 0









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COMPRESSOR CLUTCH
Disconnect wiring to compressor clutch. Connect battery
voltage directly to A/C compressor clutch wiring harness connector
terminals. If a click is heard, clutch engagement is okay. If click is
not heard, pulley and armature are not making contact. Repair or
replace as necessary.
REAR BLOWER SWITCH
Montero
With blower switch in position indicated in REAR BLOWER
SWITCH CONTINUITY TEST table, ensure continuity exists between
terminals listed. See Fig. 8.
REAR BLOWER SWITCH CONTINUITY TEST TABLE









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Switch Terminal
Position Numbers Continuity
OFF ................. 1-6 ................. No
Low .............. 1, 2 & 6 .............. Yes
Medium 1 ......... 1, 3 & 6 .............. Yes
Medium 2 ......... 1, 4 & 6 .............. Yes
High ............. 1, 5 & 6 .............. Yes









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Fig. 8: Identifying Rear Blower Switch Terminals (Montero)
Courtesy of Mitsubishi Motor Sales of America.
REFRIGERANT TEMPERATURE SENSOR
Disconnect refrigerant temperature sensor electrical
connector. Using an ohmmeter, measure resistance between terminals. At

77F (25C) resistance should be approximately 80,470 ohms. If
resistance deviates greatly, replace sensor.
RELAYS
4-Terminal Relay
1) Either round or square relays may be used. Testing is same
for either relay. Remove relay from holder. Using an ohmmeter, ensure
continuity exists between terminals No. 2 and 4 and does not exist
between terminals No. 1 and 3. See Fig. 9.
2) Connect battery voltage to terminal No. 2, and ground
terminalNo. 4. Ensure continuity exists between terminals No. 1 and 3.
If continuity is not as specified, replace relay.
Fig. 9: Testing 4-Terminal Relays
Courtesy of Mitsubishi Motor Sales of America.
6-Terminal Relay
Remove relay from holder. Using an ohmmeter, ensure

HEATER HOSES
HIGH PRESSURE RELIEF VALVES (HPRV)
IDLERS
IN-LINE FILTERS
METAL FITTINGS
METAL LINES
MIX AND AIR CONTROL DOORS (BLEND DOORS)
O-RINGS
ORIFICE TUBES
PILOT-OPERATED ABSOLUTES (POAS)
PLENUMS
PRESSURE CONTROL VALVES
PRESSURE SENSORS
PULLEYS
RADIATORS
RECEIVER-DRIERS
REFRIGERANT
REFRIGERANT OIL
RELAYS
SEALS
SERVICE PORTS
SPRING LOCK COUPLINGS
SUCTION THROTTLING VALVES (STVS)
SWITCHES (ELECTRICAL)
TENSIONERS
THERMISTORS AND PRESSURE SENSORS
THERMOSTATS AND HOUSINGS
VACUUM HOSES AND TUBES
VACUUM RESERVOIRS
VACUUM TUBES
VALVES IN RECEIVER (VIRS)
WATER PUMPS (ELECTRIC AUXILIARY)
WIRING HARNESSES AND CONNECTORS
MOTORIST ASSURANCE PROGRAM (MAP)
OVERVIEW
The Motorist Assurance Program is the consumer outreach
effort of the Automotive Maintenance and Repair Association, Inc.
(AMRA). Participation in the Motorist Assurance Program is drawn from
retailers, suppliers, independent repair facilities, vehicle
manufacturers and industry associations.
Our organization's mission is to strengthen the relationship
between the consumer and the auto repair industry. We produce
materials that give motorists the information and encouragement to
take greater responsibility for their vehicles-through proper,
manufacturer-recommended, maintenance. We encourage participating
service and repair shops (including franchisees and dealers) to adopt
(1) a Pledge of Assurance to their Customers and (2) the Motorist
Assurance Program Standards of Service. All participating service
providers have agreed to subscribe to this Pledge and to adhere to the
promulgated Standards of Service demonstrating to their customers that
they are serious about customer satisfaction.
These Standards of Service require that an inspection of the
vehicle's (problem) system be made and the results communicated to the\
customer according to industry standards. Given that the industry did
not have such standards, the Motorist Assurance Program successfully
promulgated industry inspection communication standards in 1994-95 for
the following systems: Exhaust, Brakes, ABS, Steering and Suspension,
Engine Maintenance and Performance, HVAC, and Electrical Systems.
Further, revisions to all of these inspection communication standards

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Condition Code Procedure
Air control door
binding ................ A ... Require repair or replacement
Air control door
broken ................. A .. Require repair or replacement.
Air control door
leaking ................ A .. Require repair or replacement.
Air control door
seized ................. A .. Require repair or replacement.
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.
Cracked ................. 2 .. Suggest repair or replacement.
Drain hole restricted ... A ................. Require repair.
Drain plugged ........... A ................. Require repair.
Duct disconnected ....... A .. Require repair or replacement.
Duct leaking ............ A .. Require repair or replacement.
Duct missing ............ C ............ Require replacement.
Duct restricted ......... A .. Require repair or replacement.
Leaking ................. A .. Require repair or replacement.
Noisy ................... 2 ..... Suggest cleaning or repair.
Odor .................... 2 ..... Suggest cleaning or repair.
Restricted .............. A .... Require cleaning, repair, or
replacement.









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PRESSURE CONTROL VALVES
See:
* EVAPORATOR PRESSURE REGULATORS (EPRS)
* HIGH PRESSURE RELIEF VALVES (HPRV)
* PILOT-OPERATED ABSOLUTES (POAS)
* SUCTION THROTTLING VALVES (STVS)
* VALVES IN RECEIVER (VIRS)
PRESSURE SENSORS
See THERMISTORS AND PRESSURE SENSORS .
PULLEYS
PULLEY INSPECTION








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Condition Code Procedure
Alignment incorrect ..... B .. Require repair or replacement.
Application incorrect ... B ............ Require replacement.
Attaching hardware
broken ................. A ... Require repair or replacement
of hardware.
Attaching hardware
missing ................ C .......... Require replacement of
hardware.
Attaching hardware not

Alignment incorrect ..... B .. Require repair or replacement.
Application incorrect ... B ............ Require replacement.
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.
Bearing worn ............ 1 ............ Suggest replacement.
Belt tension incorrect .. B ... Require adjustment or repair.
Bracket cracked ......... A .. Require repair or replacement.
Housing cracked ......... A .. Require repair or replacement.
Missing ................. C ............ Require replacement.
Noisy ................... 2 ............ Suggest replacement.
Pulley damaged, affecting
belt life .............. A ............ Require replacement.
Seized .................. A .. Require repair or replacement.









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THERMISTORS AND PRESSURE SENSORS
NOTE: Includes, but not limited to, In-Car Temperature, Ambient
Air Temperature, Sun Load Sensor, etc.
THERMISTOR AND PRESSURE SENSOR 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.
Calibration incorrect ... B .. Require repair or replacement.
Connector broken ........ A .. Require repair or replacement.
Connector (Weatherpack
type) leaking .......... A .. Require repair or replacement.
Connector melted,
affecting performance .. A ........... ( 1) Require repair or
replacement.
Connector melted, not
affecting performance .. 2 ........... ( 1) Suggest repair or
replacement.
Connector missing ....... C ............ Require replacement.
Inoperative ............. A ........... ( 2) Require repair or
replacement.
Missing ................. C ............ Require replacement.
Terminal burned, affecting
performance ............ A ........... ( 1) Require repair or
replacement.
Terminal burned, not
affecting performance ... 2 .. Suggest repair or replacement.
Terminal corroded,
affecting performance .. A .. Require repair or replacement.
Terminal corroded, not
affecting performance .. 2 .. Suggest repair or replacement.

minutes. Repeat this step several times for about one hour. This helps
remove air from engine oil.
IGNITION TIMING
NOTE: Perform all adjustments with engine at normal operating
temperature, cooling fan and accessories off, transmission
in Park or Neutral, and front wheels in straight-ahead
position. Set curb idle speed to specification. See IDLE
SPEED SPECIFICATIONS table under IDLE SPEED & MIXTURE.
IGNITION TIMING
1) Locate ignition timing adjustment connector. See IGNITION
TIMING ADJUSTMENT CONNECTOR LOCATION table. Connect jumper wire
between ignition timing adjustment connector and ground. Check
ignition basic timing.
2) If ignition basic timing is not within specification,
loosen distributor (or crank angle sensor on engines with dual coil
assembly) and rotate to adjust timing if necessary. See IGNITION
TIMING SPECIFICATIONS table. Disconnect jumper wire from ignition
timing adjustment connector.
IGNITION TIMING SPECIFICATIONS TABLE (Degrees BTDC@RPM)









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Application (1) Basic (1) (2) Actual
1.5L
Colt, Colt 200
Mirage & Summit ....... 5@650-850 ........ 10@650-850
1.6L
Mirage ................. 5@650-850 ......... 8@650-850
1.8L
Eclipse ................ 5@600-800 ........ 10@600-800
2.0L
Colt Vista &
Galant (VIN V) ........ 5@600-800 ........ 10@600-800
Eclipse ................ 5@650-850 ......... 8@650-850
Galant
(VIN R) ............... 5@650-850 ......... 8@650-850
(VIN U) ............... 5@650-850 ........ 12@650-850
2.4L
Pickup & Ram-50 ........ 5@650-850 ......... 8@650-850
3.0L
Montero, Pickup, Ram-50
Stealth & 3000GT ...... 5@600-800 ........ 15@600-800
(1) - Transmission in Park or Neutral.
(2) - Actual timing may fluctuate.









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IGNITION TIMING ADJUSTMENT CONNECTOR LOCATION TABLE








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Application (1)(2) Wire Color Locati\
on
Colt, Colt Vista, Colt 200,
Mirage & Summit
1.5L, 1.6L & 2.0L ................ Yellow/Red ............. (3)\
Eclipse
1.8L & 2.0L (Except Turbo) ........ Yellow/Red ............. (4\
)
2.0L Turbo ....................... Yellow/Black ............ (4)\
Galant

2.0L .............................. Yellow/Red ............. (5)\
Montero
3.0L ............................. White/Yellow ............ (4)\
Pickup & Ram-50
2.4L .............................. Black/Blue ............. (6)\
3.0L ............................. White/Yellow ............ (6)\
Stealth (SOHC)
3.0L ............................. White/Yellow ............ (4)\
Stealth & 3000GT (DOHC)
3.0L (Non-Turbo) ................. Black/Green ............. (4\
)
3.0L (Turbo) ..................... White/Yellow ............ (4\
)
(1) - Remove waterproof female connector (if equipped) for access to\
wire.
(2) - Ground connector at wire end for basic timing adjustment.
(3) - On main wiring harness, near center of firewall.
(4) - On main wiring harness, near wiper motor on firewall.
(5) - On main wiring harness, near master cylinder on firewall.
(6) - Between right shock tower and firewall.
(7) - Near front of right shock tower.









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IDLE SPEED & MIXTURE
NOTE: Perform adjustments with engine at normal operating
temperature, cooling fan and accessories off, transmission
in Park or Neutral, and front wheels in straight-ahead
position.
CURB (SLOW) IDLE SPEED
NOTE: Curb idle speed is controlled by Idle Speed Control (ISC)
motor. Adjustment is usually not necessary. For curb idle
speed specifications, see IDLE SPEED SPECIFICATIONS table
under BASIC IDLE SPEED.
1) Check ignition timing and adjust if necessary. Run engine
at 2000-3000 RPM for more than 5 seconds. Allow engine to idle for 2
minutes. Check curb idle speed.
2) If curb idle speed is not within specification, check ISC
system. If ISC system is okay, adjust basic idle speed. See BASIC IDLE
SPEED.
BASIC IDLE SPEED
NOTE: ALWAYS check TPS adjustment after adjusting basic idle
speed. See THROTTLE POSITION SENSOR (TPS).
BASIC IDLE SPEED TEST APPLICATION TABLE









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Application Test
1.5L
Colt, Colt 200,
Mirage & Summit ............. TEST NO. 1
1.6L
Mirage ....................... TEST NO. 2
1.8L
Eclipse ...................... TEST NO. 1
2.0L (VIN V)
Colt Vista & Galant .......... TEST NO. 1
2.0L (VIN R & U)

throttle body to prevent solvent from entering passage.
4) Clean throttle body with solvent. Replace air intake hose.
Recheck basic idle speed. If basic idle speed is within specification
after cleaning throttle body, go to step 9). If basic idle speed is
still not within specification after cleaning throttle body,
disconnect jumper wires connected in steps 1) and 2). On all models
except Eclipse, Galant and Mirage, go to step 6). On Eclipse, Galant
and Mirage, go to step 5).
5) Adjust idle position switch and go to step 7). See IDLE
POSITION SWITCH under THROTTLE POSITION SENSOR (TPS).
6) Adjust fixed Speed Adjusting Screw (SAS) and go to next
step. See FIXED SPEED ADJUSTING SCREW under IDLE SPEED & MIXTURE.
7) Reconnect jumper wires as indicated in steps 1) and 2).
Check basic idle speed. If basic idle speed is within specification,
go to step 9). If basic idle speed is not within specification, adjust
by turning idle speed adjusting screw on throttle body. See Fig. 2. Go
to next step.
8) If basic idle speed is within specification after turning
idle speed adjusting screw, go to step 9). If basic idle speed cannot
be adjusted to specification by turning idle speed adjusting screw,
check for leaking fast idle air valve. Replace throttle body if fast
idle air valve leaks.
9) Turn ignition off. Disconnect jumper wires from ignition
timing adjustment connector and diagnostic connector. Operate engine
at idle for about 5 minutes. Ensure engine idles smoothly and within
curb idle specification. See IDLE SPEED SPECIFICATIONS table.
IDLE SPEED SPECIFICATIONS TABLE









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Application Curb Idle Basic Idle
1.5L
Colt, Colt 200,
Mirage & Summit .... 650-850 ...... 700-800
1.6L
Mirage .............. 650-850 ...... 700-800
1.8L
Eclipse ............. 600-800 ...... 650-750
2.0L (VIN V)
Colt Vista .......... 600-800 ...... 650-750
Galant .............. 650-850 ...... 700-800
2.0L (VIN R & U)
Eclipse ............. 650-850 ...... 650-750
Galant .............. 650-850 ...... 700-800
2.4L
Pickup & Ram-50 ..... 650-850 ...... 700-800
3.0L
Montero, Pickup, Ram-50,
Stealth & 3000GT . 600-800 ...... 650-750









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Fig. 1: Idle & Fixed Speed Adj. Screws (1.5L, 1.8L, 2.0L (VIN V)
& 2.4L)

NOTE: Fixed Speed Adjusting Screw (SAS) is preset by manufacturer
and usually does not require adjustment. Only adjust fixed
SAS if other adjustment procedures require it, or if
manufacturer's original setting has been changed.
3.0L Montero, Pickup, Ram-50, Stealth & 3000GT
1) Loosen throttle cable. Loosen fixed SAS lock nut. See
Fig. 4. Turn fixed SAS counterclockwise until throttle valve is fully
closed. Turn fixed SAS clockwise until throttle valve begins to open.
Turn fixed SAS clockwise 1 1/4 turns after throttle valve begins to
open.
2) Tighten lock nut while holding fixed SAS in position.
Adjust throttle cable. Adjust basic idle speed. See BASIC IDLE SPEED
under IDLE SPEED & MIXTURE. Adjust throttle position sensor. See
THROTTLE POSITION SENSOR (TPS).
All Other Models
To adjust fixed SAS, adjust basic idle speed. See BASIC IDLE
SPEED under IDLE SPEED & MIXTURE.
Fig. 4: Fixed Speed Adj. Screw & Feeler Gauge Pos. (3.0L)
Courtesy of Mitsubishi Motor Sales of America.
IDLE MIXTURE