1998 MITSUBISHI MONTERO check oil

A/C COMPRESSOR REFRIGERANT OIL CHECKING
1998 Mitsubishi Montero
1998 A/C SYSTEM GENERAL SERVICING
Mitsubishi - Compressor Refrigerant Oil Checking
Diamante, Eclipse, Galant, Mirage, Montero, Montero Sport &
3000GT
* PLEASE READ THIS FIRST *
NOTE: Always refer to underhood A/C specification label in engine
compartment or A/C compressor label while servicing A/C
system. If engine compartment/compressor label specifications
differ from specifications in this article, use
underhood/compressor label specifications.
A/C COMPRESSOR APPLICATIONS
A/C COMPRESSOR APPLICATION TABLE








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Application Compressor
Diamante ......................... Sanden MSC105CVS Scroll
Eclipse
2.0L Non-Turbo ............. Nippondenso 10PA17C 10-Cyl.
2.0L Turbo & 2.4L .............. Sanden MSC105CVS Scroll
Galant ............................ Sanden MSC90C12 Scroll
Mirage ............................... Sanden MSC90 Scroll
Montero ....................... Nippondenso 10PA15 10-Cyl.
Montero Sport ...................... Sanden MSC105C Scroll
3000GT .............................. Sanden MSC105 Scroll









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REFRIGERANT OIL & REFRIGERANT CAPACITY SPECIFICATIONS
NOTE: DO NOT exceed A/C system refrigerant oil capacity when
servicing system.
REFRIGERANT OIL & R-134a REFRIGERANT CAPACITY TABLE









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Application ( 1) Oil Refrigerant
Ounces Ounces
Diamante .................... 5.7-6.4 ........ 22.9-24.3
Eclipse
2.0L Non-Turbo ............ 2.7-4.1 ........ 24.7-26.1
2.0L Turbo & 2.4L ......... 5.7-6.4 ........ 24.7-26.1
Galant ...................... 4.1-5.1 ........ 22.9-24.3
Mirage ...................... 4.1-5.1 ........ 19.6-21.0
Montero ..................... ( 2) 4.1 ........ 21.2-22.9
Montero Sport ............... ( 2) 5.7 ........ 22.9-24.0
3000GT ...................... 4.7-6.1 ........ 26.1-27.9
( 1) - Total system capacity, unless otherwise noted.
( 2) - Compressor refrigerant oil capacity.









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REFRIGERANT OIL

Only NEW, moisture-free refrigerant oil should be used in the
air conditioning system. This oil is highly refined and dehydrated so
moisture content is less than 10 parts per million. The oil container
must be tightly closed at all times when not in use, or moisture from
the air will be absorbed into the refrigerant oil.
SERVICING PRECAUTIONS
DISCHARGING SYSTEM
Discharge A/C system, using approved refrigerant
recovery/recycling equipment that meets SAE J2210 requirements. Always
follow recovery/recycling equipment manufacturer's instructions. After
refrigerant recovery process is completed, replace any refrigerant oil
removed with the same amount of NEW refrigerant oil.
DISCONNECTING LINES & FITTINGS
After system is discharged, carefully clean area around all
fittings to be opened. Always use 2 wrenches when tightening or
loosening fittings. Some refrigerant lines are connected with a
coupling. Special tools may be required to disconnect lines. Cap or
plug all openings as soon as lines are removed. DO NOT remove shipping
caps from replacement components until ready to install.
CONNECTING LINES & FITTINGS
NOTE: Ensure all replacement component connections match
connections of system being worked on.
Always use a NEW gasket or "O" ring when connecting lines or
fittings. Coat "O" ring with NEW refrigerant oil and ensure it is not
twisted during installation. Always use two wrenches to prevent damage
to lines and fittings.
PLACING SYSTEM IN OPERATION
After component service or replacement has been completed and
all connections have been made, thoroughly evacuate system with a
vacuum pump. Charge system with proper amount of refrigerant and
perform leak test. See REFRIGERANT OIL & REFRIGERANT SPECIFICATIONS
table for system capacities. Ensure there are no leaks at any fitting
that has been opened. After system has been leak tested, check system
performance.
NIPPONDENSO 10-CYL.
Eclipse 2.0L Non-Turbo & Montero
Replacement compressor is shipped with NEW refrigerant oil.
Drain, measure and discard refrigerant oil from old compressor. Drain
NEW refrigerant oil from replacement compressor equal to difference
between amount drained from old compressor and amount shipped in
replacement compressor. If any other components are replaced, add NEW
refrigerant oil as specified. See COMPONENT REFRIGERANT OIL CAPACITIES
(MITSUBISHI - NIPPONDENSO 10-CYL.) table.
COMPONENT REFRIGERANT OIL CAPACITIES TABLE (NIPPONDENSO)









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Component Ounces
Compressor ( 1)

A/C COMPRESSOR SERVICING
1998 Mitsubishi Montero
1998 GENERAL SERVICING
Mitsubishi - Compressor Servicing
Diamante, Eclipse, Galant, Mirage, Montero, Montero Sport &
3000GT
A/C COMPRESSOR APPLICATIONS
A/C COMPRESSOR APPLICATION TABLE








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Application Compressor
Diamante ......................... Sanden MSC105CVS Scroll
Eclipse
2.0L Non-Turbo ............. Nippondenso 10PA17C 10-Cyl.
2.0L Turbo & 2.4L .............. Sanden MSC105CVS Scroll
Galant ............................ Sanden MSC90C12 Scroll
Mirage ............................... Sanden MSC90 Scroll
Montero ....................... Nippondenso 10PA15 10-Cyl.
Montero Sport ...................... Sanden MSC105C Scroll
3000GT .............................. Sanden MSC105 Scroll









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NOTE: Due to variety of clutch and shaft seal configurations,
obtain appropriate A/C compressor service tools for
compressor being serviced. Land Rover and Jaguar compressor
service information not available at time of publication.
NIPPONDENSO
CLUTCH COIL
Removal
1) Hold clutch plate stationary. Remove clutch plate center
bolt and clutch plate. If clutch plate cannot be removed by hand,
tighten an 8-mm or 10-mm bolt into clutch plate center bolt hole to
remove clutch plate.
2) Remove shim(s) and pulley snap ring from compressor shaft\
.
Tap pulley using a plastic hammer and remove pulley from compressor
shaft. See Fig. 1 or 2. Remove retaining screw for clutch coil lead.
Remove clutch coil snap ring and clutch coil.
Installation
1) To install, reverse removal procedure. Ensure clutch coil
pin is aligned with hole in compressor housing. Ensure clutch coil
lead is positioned properly. Ensure NEW snap rings are installed with
beveled side facing out. Tighten shaft bolt to 10-13 ft. lbs. (14-17
N.m).
2) Check air gap between clutch plate and pulley. Position
dial indicator on clutch plate. Energize clutch coil and zero dial
indicator. De-energize clutch coil and measure air gap (clutch plate
movement). Ensure air gap between clutch plate and pulley is 0.014-0.
026" (0.35-0.65 mm). If air gap is incorrect, add or remove shim(s) \
as
necessary. Ensure pulley rotates freely.
NOTE: On some compressors, it is necessary to use a dial indicator
on clutch plate to check air gap. Energize clutch coil and
zero dial indicator. De-energize clutch coil and measure air
gap. Ensure air gap is as specified.

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

Other Means Of Identification
Refrigerant R-134a, when viewed through a sight glass, may
have a "milky" appearance due to the mixture of refrigerant and
lubricating oil. As the refrigerant and oil DO NOT exhibit a "clear"
sight glass on a properly charged A/C system, most R-134a systems have
no sight glass.
REFRIGERANT OILS
NOTE: Use ONLY the specified oil for the appropriate system or A/C
compressor. Always check vehicle underhood A/C specification
label or A/C compressor label before adding refrigerant oil
to A/C compressor/system. See Figs. 2 and 3. Always use
refrigerant oil specified on vehicle underhood A/C
specification label if different from the following list.
Refrigerant R-12 based systems use mineral oil, while R-134a
systems use Polyalkylene Glycol (PAG) oils. Using a mineral oil based
lubricant with R-134a will result in A/C compressor failure due to
lack of proper lubrication. The following R-134a refrigerant oils are
currently specified:
Use DENSO/ND-Oil 8 refrigerant oil on Nippondenso
compressors. Use SUN PAG 56 refrigerant oil on Sanden compressors.
NOTE: PAG oils absorb moisture very rapidly, 2.3-5.6 percent by
weight, as compared to a mineral oil absorption rate of
0.005 percent by weight.
SERVICE EQUIPMENT
A/C systems using R-134a refrigerant and PAG lubricants
cannot use R-12 refrigerant or mineral oil lubricants. R-134a
refrigerant is NOT compatible or interchangeable with R-12
refrigerant. Separate sets of hoses, manifold gauge sets and
recovery/recycling equipment are required to service the different
systems. This is necessary to avoid cross-contaminating and damaging
A/C system. A single set of A/C service equipment cannot be cleaned
thoroughly enough to be used with both types of refrigerant.
All equipment used to service A/C systems using R-134a must
be U.L. listed and certified to meet SAE standard J2210. The service
hoses on the manifold gauge set must have manual (turn wheel) or
automatic back-flow valves at the service port connector ends. This
will prevent refrigerant from being released into the atmosphere.
For identification purposes, R-134a service hoses must have a
Black stripe along its length and be clearly labeled SAE J2196/R-134a.
The low pressure test hose is Blue with a Black stripe. The high
pressure test hose is Red with a Black stripe, and the center test
hose is Yellow with a Black stripe.
R-134a manifold gauge sets can be identified by one or all of
the following: Labeled FOR USE WITH R-134a on set, labeled HFC-134a or
R-134a on gauge face, or by a Light Blue color on gauge face. In
addition, pressure/temperature scales on R-134a gauge sets are
different from R-12 manifold gauge sets.
SYSTEM SERVICE VALVES
SCHRADER-TYPE VALVES
NOTE: Although similar in construction and operation to a tire
valve, NEVER replace a Schrader-type valve with a tire valve.

DIAGNOSTIC TROUBLE CODE IDENTIFICATION
DIAGNOSTIC TROUBLE CODE IDENTIFICATION








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DTC ( 1) Probable Cause
11 ........................ Defective TP Sensor Or TP Sensor Circuit
15 ............................. Open Oil Temperature Sensor Circuit
16 ............................ Short Oil Temperature Sensor Circuit
21 ................................... Short Ignition Signal Circuit
22 .................................... Open Ignition Signal Circuit
23 .......................... Open Signal Line (ECT) From ECM To TCM\
24 ......................... Short Signal Line (ECT) From ECM To TCM\
29 ............................. Short Neutral Safety Switch Circuit
30 .............................. Open Neutral Safety Switch Circuit
31 ................................. Open No. 2 Speed Sensor Circuit
32 ................................. Open No. 1 Speed Sensor Circuit
41 ..................................... Open Solenoid No. 1 Circuit
42 .................................... Short Solenoid No. 1 Circuit
43 ..................................... Open Solenoid No. 2 Circuit
44 .................................... Short Solenoid No. 2 Circuit
47 ................................... Open Lock-Up Solenoid Circuit
48 .................................. Short Lock-up Solenoid Circuit
49 .............. ( 2) Torque Converter Clutch Engagement Malfunction
50 ........... ( 2) Torque Converter Clutch Disengagement Malfunction
51 ................................. 1st Gear Ratio Signal Incorrect
52 ................................. 2nd Gear Ratio Signal Incorrect
53 ................................. 3rd Gear Ratio Signal Incorrect
54 ................................. 4th Gear Ratio Signal Incorrect
( 1) - Check listed fault code and component for probable cause. See
appropriate fault code listing under DIAGNOSTIC TESTS. Check
wiring and connections of specified component.
( 2) - Scan tool is required for testing malfunctioning circuit.









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Fig. 6: Identifying Data Link Connector (DLC) Terminals
Courtesy of Mitsubishi Motor Sales of America.

Once repairs have been performed, DTCs must be cleared from
TCM memory. DTCs may be cleared by disconnecting negative battery
cable for 10 seconds or more. Reconnect cable and ensure DTCs have
been cleared. Start engine and warm to normal operating temperature.
Run engine at idle for 10 minutes. DTCs may also be cleared using scan
tool. Refer to manufacturer's instruction manual.
DIAGNOSTIC TESTS
NOTE: For terminal and wire color identification, see WIRING
DIAGRAMS.
DTC 11: THROTTLE POSITION (TP) SENSOR
For diagnosis and testing information, see appropriate SELF-
DIAGNOSTICS article in ENGINE PERFORMANCE section. If TP sensor is
okay, check wiring harness and connectors between TP sensor and TCM.
Repair if necessary. If wiring harness and connectors are okay,
replace TCM.
DTC 15 & 16: OPEN OR SHORT IN OIL TEMPERATURE SENSOR CIRCUIT
1) Test oil temperature for proper operation. See OIL
TEMPERATURE SENSOR under COMPONENT TESTING. If oil temperature sensor
is okay, check wire harness, connectors and ground circuit for poor
connections or damage. Go to next step.
2) If wire harness and connectors are okay, check DTCs again
and verify code No. 15 or No. 16 still exists. If either code still
exists, replace TCM.
DTC 21 & 22: SHORT OR OPEN IN IGNITION SIGNAL CIRCUIT
1) Using an external tachometer, verify vehicles' tachometer
is operating accurately. If tachometer is incorrect, check ignition
coil and ignition power transistor and circuits for malfunction. See
appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE section.
2) If tachometer is okay, check TCM wire harness connector
for poor connection. If wire harness is okay, recheck DTCs. If codes
reappear check wire harness between ignition power transistor and TCM.
If wire harness is okay, replace TCM.
DTC 23 & 24: OPEN OR SHORT IN SIGNAL LINE (ECT) FROM ECM TO
TCM
Check wire harness, connectors and ground circuit for poor
connections or damage. Go to next step. If wire harness and connectors
are okay, check DTCs again and verify code No. 23 or No. 24 still
exists. If either code still exists, replace TCM.
DTC 29 & 30: SHORT OR OPEN IN PARK/NEUTRAL POSITION (PNP)
SWITCH CIRCUIT
1) Check PNP switch for correct operation. See. If PNP switch
is okay, disconnect switch connector and measure voltage between
harness connector terminal No. 1 and ground.
2) If battery voltage does not exist, check wire harness and
connectors. See WIRING DIAGRAMS. If battery voltage exists, check wire
harness and connectors between PNP switch and TCM. If wire harness is
okay, replace TCM.
DTC 31: INPUT SPEED SENSOR

If DTC 51 is set also, go to DTC 51: 1ST GEAR RATIO SIGNAL
INCORRECT test. If DTC 51 is not set, check overdrive brake for a
mechanical failure. See OVERDRIVE BRAKE in MITSUBISHI R4AW3 & V4AW3
OVERHAUL article.
SYMPTOM TROUBLE SHOOTING
NOTE: Check system using appropriate scan tool. See WIRING DIAGRAMS
for electrical schematics and COMPONENT TESTING.
COMMUNICATION WITH SCAN TOOL NOT POSSIBLE
If scan tool cannot communicate with TCM, check proper
connection with DLC. Check TCM power circuits, TCM ground circuits and
malfunctioning TCM.
SHIFT POINTS INCORRECT
If shift points are incorrect, check for DTCs. If no DTC is
present, check oil temperature sensor, pattern select switch, 4WD low
range detection switch and TCM for proper operation.
UPSHIFTS OCCUR SPONTANEOUSLY
If upshifting occurs spontaneously, check park/neutral
position switch, overdrive switch and TCM for proper operation.
TCC LOCK-UP MALFUNCTIONING
If TCC lock-up system is not operating properly, check torque
converter, valve body, lock-up switch and oil temperature switch.
COMPONENT TESTING
A/T FLUID TEMPERATURE SWITCH
1) Remove fluid temperature switch, located to rear of
neutral safety switch. Immerse switch in container of ATF up to top
threaded portion of switch. Using a DVOM, check continuity between
switch terminals. Continuity should not exist when fluid temperature
is 257
F (125C) or less.
2) When fluid is heated to 289-304F (143-151C), continuity
should exist. Replace switch if necessary. Apply thread sealant to
fluid temperature switch threads and install in transmission.
BRAKELIGHT SWITCH
1) Disconnect electrical connector from brakelight switch,
located near brake pedal. Using ohmmeter, ensure continuity exists
between terminal No. 2 (White/Red wire) and terminal No. 3 (Green
wire) with brake pedal released. Replace brakelight switch if
continuity does not exist. Continuity should not exist between
terminals No. 2 and No. 3 with brake pedal depressed.
2) If continuity does not exist, ensure brake pedal is
properly adjusted so brakelight switch has proper travel for switch
operation. If proper brakelight switch travel exists, replace
brakelight switch.
ENGINE COOLANT TEMPERATURE (ECT) SENSOR