1998 MITSUBISHI MONTERO evap

Schrader valve is similar in construction and operation to a
tire valve. When a test gauge hose with built-in valve core depressor
is attached, Schrader stem is pushed inward to the open position and
allows system pressure to reach gauge.
If test hose does not have a built-in core depressor, an
adapter must be used. Never attach hose or adapter to Schrader valve
unless it is first connected to manifold gauge set.
Refrigerant R-12 Schrader-type valve cores have TV5 thread
size. Refrigerant R-134a Schrader-type valve cores use M6 (Metric)
threads. See Fig. 1.
SERVICE VALVE LOCATIONS
SERVICE VALVE LOCATIONS TABLE








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Vehicle High Low
Diamante ...................... ( 1) ................ ( 2)
Eclipse ....................... ( 1) ................ ( 2)
Galant ........................ ( 1) ................ ( 2)
Mirage ........................ ( 1) ................ ( 2)
Montero ....................... ( 3) ................ ( 3)
Montero Sport ................. ( 1) ................ ( 2)
3000GT ........................ ( 4) ................ ( 2)
( 1) - On high pressure line, between accumulator/receiver-
drier and evaporator.
( 2) - On low pressure line, between evaporator and
compressor.
( 3) - On top of accumulator/receiver-drier.
( 4) - On high pressure line, near receiver-drier.









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REFRIGERANT RECOVERY/RECYCLING
Refrigerant recovery/recycling equipment is used to remove
refrigerant from vehicle's A/C system without polluting atmosphere. To
remove and recycle refrigerant, connect the recovery/recycling
equipment and following the equipment manufacturer's instructions.
Removed refrigerant is filtered, dried and stored in a tank
within the recovery/recycling equipment until it is ready to be pumped
back into vehicle A/C system. With refrigerant stored in the
recovery/recycling equipment, A/C system can be opened without
polluting atmosphere.
NOTE: Separate sets of hoses, gauges and refrigerant
recovery/recycling equipment MUST be used for R-12 and
R-134a based systems. DO NOT mix R-12 and R-134a
refrigerants, as their refrigerant oils and desiccants are
not compatible. It is NOT possible to clean equipment
thoroughly enough to prevent cross-contamination of A/C
systems. On systems with R-134a refrigerant, use
Polyalkylene Glycol (PAG) wax-free refrigerant oil.

B - EMISSION APPLICATION
1998 Mitsubishi Montero
1998 ENGINE PERFORMANCE
Mitsubishi - Emission Applications
Diamante, Eclipse/Spyder, Galant, Mirage, Montero/Sport,
3000GT
EMISSION APPLICATIONS
EMISSION APPLICATIONS TABLE








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Model, Engine & Fuel System Emission Control Systems/Devices
Diamante
3.5L V6 SFI
Major Control Systems/Devices .... PCV, EVAP, TWC, FR, EGR, SPK,
( 1) HO2S, CEC, MIL
Components/Other Related Devices ........... EVAP-CPCS, EVAP-VC,
EVAP-VSOL, EGR-CS, EGR-VCV, SPK-CC
Eclipse
2.0L 4-Cyl. SFI
Non-Turbo
Major Control Systems/Devices ....... PCV, EVAP, TWC, FR, EGR,
SPK, ( 1) HO2S, CEC, MIL
Components/Other Related Devices ......... EVAP-CPCS, EVAP-VC,
EVAP-VSOL, EGR-TS, SPK-CC
Turbo
Major Control Systems/Devices PCV, EVAP, TWC, FR, EGR,
SPK, ( 1) HO2S, CEC, MIL
Components/Other Related Devices .... (2) EVAP-CKV, EVAP-CPCS,
EVAP-CPCV, EVAP-VC, EVAP-VSOL, EGR-SOL, SPK-CC
Eclipse Spyder
2.0L 4-Cyl. Turbo SFI
Major Control Systems/Devices ......... PCV, EVAP, TWC, FR, EGR,
SPK, ( 1) HO2S, CEC, MIL
Components/Other Related Devices ..... (2) EVAP-CKV, EVAP-CPCS,
EVAP-CPCV, EVAP-VC, EVAP-VSOL, EGR-SOL, SPK-CC
2.4L 4-Cyl. SFI
Major Control Systems/Devices ......... PCV, EVAP, TWC, FR, EGR,
SPK, ( 1) HO2S, CEC, MIL
Components/Other Related Devices ........... EVAP-CPCS, EVAP-VC,
EVAP-VSOL, EGR-SOL, EGR-VCV, SPK-CC
Galant
2.4L 4-Cyl. SFI
Major Control Systems/Devices .......... PCV, EVAP, (3) TWC, FR,
( 4) EGR, SPK, ( 1) HO2S, CEC, MIL
Components/Other Related Devices ........... EVAP-CPCS, EVAP-VC,
EVAP-VSOL, ( 4) EGR-CS, ( 4) EGR-VCV, SPK-CC
Mirage
1.5L 4-Cyl. SFI
Major Control Systems/Devices .......... PCV, EVAP, (3) TWC, FR,
EGR, SPK, ( 1) HO2S, CEC, MIL
Components/Other Related Devices ........... EVAP-CPCS, EVAP-VC,
EVAP-VSOL, EGR-SOL, EGR-VCV, SPK-CC
1.8L 4-Cyl. SFI
Major Control Systems/Devices .... PCV, EVAP, TWC, FR, EGR, SPK,
( 1) HO2S, CEC, MIL
Components/Other Related Devices ........... EVAP-CPCS, EVAP-VC,
EVAP-VSOL, EGR-SOL, EGR-VCV, SPK-CC
Montero
3.5L V6 SFI

Major Control Systems/Devices ..... PCV, EVAP, (5) TWC, ( 4) EGR,
FR, SPK, ( 6) ( 7) HO2S, CEC, MIL
Components/Other Related Devices ........... EVAP-CPCS, EVAP-VC,
EVAP-VSOL, ( 4) EGR-SOL, ( 4) EGR-VCV, SPK-CC
Montero Sport
2.4L 4-Cyl. SFI
Major Control Systems/Devices ..... PCV, EVAP, TWC, FR, ( 4) EGR,
SPK, ( 1) HO2S, CEC, MIL
Components/Other Related Devices ........... EVAP-CPCS, EVAP-VC,
EVAP-VSOL, ( 4) EGR-SOL, ( 4) EGR-VCV, SPK-CC
3.0L V6 SFI
Major Control Systems/Devices ..... PCV, EVAP, TWC, (4) EGR, FR,
SPK, ( 6) ( 7) HO2S, CEC, MIL
Components/Other Related Devices ........... EVAP-CPCS, EVAP-VC,
EVAP-VCS, EVAP-VSOL, ( 4) EGR-VCS, SPK-CC
3000GT
3.0L V6 SFI
Non-Turbo
Major Control Systems/Devices ........ PCV, EVAP, (8) TWC, FR,
EGR, SPK, ( 9) HO2S, CEC, MIL
Components/Other Related Devices ......... EVAP-CPCS, EVAP-VC,
EGR-SOL, EGR-VCV, SPK-CC
Turbo
Major Control Systems/Devices ........ PCV, EVAP, (8) TWC, FR,
EGR, SPK, ( 9) HO2S, CEC, MIL
Components/Other Related Devices ........ EVAP-CKV, EVAP-CPCS,
EVAP-VC, EGR-SOL, EGR-VCV, SPK-CC
( 1) - Equipped with 2 HO2Ss.
( 2) - Equipped with 2 EVAP-CKVs.
( 3) - California equipped with 2 TWCs.
( 4) - Federal.
( 5) - California equipped with 3 TWCs.
( 6) - Federal equipped with 2 HO2Ss.
( 7) - California equipped with 4 HO2Ss.
( 8) - Equipped with 3 TWCs.
( 9) - Equipped with 4 HO2Ss.









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NOTE: California or Federal refers to installed emissions
equipment. California emissions models may be available in
all states.
APPLICATION ABBREIVEATIONS
APPLICATION ABBREIVEATIONS TABLE








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Application Abbreiveation
CEC .................................... Computerized Engine Control
EGR ...................................... Exhaust Gas Recirculation
EGR-CS ........................................ EGR Control Solenoid
EGR-SOL ............................................... EGR Solenoid
EGR-TS ..................................... EGR Transducer Solenoid
EGR-VCV ................................... EGR Vacuum Control Valve
EVAP ....................................... Fuel Evaporative System
EVAP-CKV .......................................... EVAP Check Valve
EVAP-CPCS ..................... EVAP Canister Purge Control Solenoid
EVAP-CPCV ........................ EVAP Canister Purge Control Valve
EVAP-VC ........................................ EVAP Vapor Canister
EVAP-VCS .............................. EVAP Vacuum Control Solenoid
EVAP-VSOL ................................ EVAP Ventilation Solenoid

usage on specific models, see appropriate wiring diagram in
L - WIRING DIAGRAMS article. For theory and operation on each
output component, refer to system indicated after component.
Data Link Connector (DLC)
See SELF-DIAGNOSTIC SYSTEM .
EGR Control Solenoid Valve
See EXHAUST GAS RECIRCULATION (EGR) CONTROL under EMISSION
SYSTEMS.
Fuel Injectors
See FUEL CONTROL under FUEL SYSTEM.
Fuel Pressure Control Solenoid Valve (Turbo)
See FUEL DELIVERY under FUEL SYSTEM.
Fuel Pressure Regulator
See FUEL DELIVERY under FUEL SYSTEM.
Idle Air Control (IAC) Motor
See IDLE SPEED under FUEL SYSTEM.
Malfunction Indicator Light
See SELF-DIAGNOSTIC SYSTEM .
Power Transistor(s) & Ignition Coils
See IGNITION SYSTEMS .
Purge Control Solenoid Valve
See EVAPORATIVE CONTROL under EMISSION SYSTEMS.
Wastegate Control Solenoid Valve
See TURBOCHARGED ENGINES under AIR INDUCTION SYSTEM.
FUEL SYSTEM
FUEL DELIVERY
Electric fuel pump, located in gas tank, feeds fuel through
in-tank fuel filter, external fuel filter (located in engine
compartment) and fuel injector rail.
Fuel Pump
Fuel pump consists of a motor-driven impeller. Pump has an
internal check valve to maintain system pressure, and a relief valve
to protect fuel pressure circuit. Pump receives voltage supply from
MFI control relay.
Fuel Pressure Control Solenoid Valve (Turbo)
Valve prevents rough idle due to fuel percolation. On engine
restart, if engine coolant or intake air temperature reaches a preset
value, PCM applies voltage to fuel pressure control solenoid valve for
2 minutes after enginerestart. Valve will open, allowing atmospheric
pressure to be applied to fuel pressure regulator diaphragm. This
allows maximum available fuel pressure at injectors, enriching fuel
mixture and maintaining stable idle at high engine temperatures.
Fuel Pressure Regulator
Located on fuel injector rail, this diaphragm-operated relief
valve adjusts fuel pressure according to engine manifold vacuum.
As engine manifold vacuum increases (closed throttle), fuel

cylinder is on its exhaust stroke when plug fires.
HALL EFFECT IGNITION SYSTEM
This system is equipped with a Hall Effect distributor.
Shutter(s) attached to distributor shaft rotate through distributor
Hall Effect switch, also referred to as a Camshaft Position (CMP)
sensor, which contains a distributor pick-up (a Hall Effect device and
magnet). As shutter blade(s) pass through pick-up, magnetic field is
interrupted and voltage is toggled between high and low. PCM uses this
data along with Crankshaft Position (CKP) sensor data to control
ignition timing and injector pulse width to maintain optimum
driveability.
Power Transistor & Ignition Coil
Power transistor is mounted inside distributor with disc and
optical sensing unit. When ignition is on, ignition coil primary
circuit is energized. As distributor shaft rotates, disc rotates,
triggering optical sensing unit. PCM receives signals from optical
sensing unit. Signals are converted and sent to power transistor,
interrupting primary current flow and inducing secondary voltage.
IGNITION TIMING CONTROL SYSTEM
Ignition timing is controlled by PCM. PCM adjusts timing
based on various conditions such as engine temperature, altitude and
detonation.
EMISSION SYSTEMS
EXHAUST GAS RECIRCULATION (EGR) CONTROL
Federal Emissions (Non-Turbo)
To lower oxides of nitrogen (NOx) exhaust emissions, a non-
computer controlled exhaust gas recirculation system is used. EGR
operation is controlled by throttle body ported vacuum. Vacuum is
routed through vacuum control valve to prevent EGR operation at low
engine temperatures.
Spring pressure holds EGR valve closed during low vacuum
conditions (engine idling or wide open throttle). When vacuum pressure\
increases and overcomes EGR spring pressure, EGR valve is lifted to
allow exhaust gases to flow into intake manifold for combustion.
California Emissions & Turbo
PCM controls EGR operation by activating EGR control solenoid
valve according to engine load. When engine is cold, PCM signals EGR
control solenoid valve to deactivate EGR.
EGR Control Solenoid Valve
Valve denies or allows vacuum supply to EGR valve based on
PCM commands.
EVAPORATIVE CONTROL
Fuel evaporation system prevents fuel vapor from entering
atmosphere. System consists of special fuel tank with vapor separator
tanks (if equipped), vacuum relief filler cap, overfill limiter (2-wa\
y
valve), fuel check valve, thermovalve (if equipped), charcoal
canister, purge control valve, purge control solenoid valve, and
connecting lines and hoses.
Purge Control Solenoid Valve

Junction Block Behind left side of dash.
Passenger Compartment Relay Box Behind left side of dash.
Power Seat Relay Box Under driver's seat.









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CONTROL UNITS









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Component Component Location








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ABS Control Unit Mounted on top of right rear
wheelwell, under metal plate.
A/C Control Unit On top of evaporator case.
Antenna Motor ECU Behind center console.
Auto-Cruise Control ECU Behind center of dash.

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Component Component Location








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ABS Speed Sensors (4) On bracket, on each wheel hub.\
Air Inlet Sensor In evaporator air duct.
Camshaft Position Sensor At bottom of left camshaft
gear.
Crankshaft Position Sensor Above crankshaft gear.
Engine Coolant Temperature Gauge Unit On thermostat housing.
Engine Coolant Temperature Sensor On thermostat housing.
Front Impact Sensor (Left) (SRS) On left front of engine
compartment.
Front Impact Sensor (Right) (SRS) On right front of engine
compartment.
Fuel Gauge Unit In fuel tank.
Fuel Tank Differential Pressure Sensor
(Calif.) Top of fuel tank.
G-Sensor (ABS) In center console, rear of
parking brake lever.
Geomagnetic Sensor (Compass) On top center of dash.

Heated Oxygen Sensor (Front)
(Federal) Underside of vehicle, forward
of catalytic converter.
Heated Oxygen Sensor (Front)
(Left Bank) (Calif.) In left exhaust manifold.
Heated Oxygen Sensor (Front)
(Right Bank) (Calif.) In right exhaust manifold.
Heated Oxygen Sensor (Rear)
(Federal) Underside of vehicle, behind
catalytic converter.
Heated Oxygen Sensor (Rear) (Left Bank)
(Calif.) In left exhaust pipe, below
engine.
Heated Oxygen Sensor (Rear) (Right Bank)
(Calif.) In right exhaust pipe, below
engine.
Input Shaft Speed Sensor On side of transmission.
Intake Air Temperature Sensor Mounted on outside of
evaporator case.
Manifold Differential Pressure Sensor On top left rear of engine.
Output Shaft Speed Sensor On rear of transmission.