check engine MITSUBISHI ECLIPSE 1991 Service Manual

25-8EMISSION CONTROL SYSTEMS - Crankcase Emission Control System
-Positive crankcase
ventilation valve3EM0051CRANKCASE VENTILATION SYSTEM
INSPEC-
TIONNZSIAAHAfter disconnecting the ventilation hose from the positive
crankcase ventilation valve, disconnect the positive crank-
case ventilation valve from the rocker cover, and reconnectthe positive crankcase ventilation valve to the ventilation
hose.
Idle engine, put finger on the opening end of the positive
crankcase ventilation valve, and check that the negative
pressure of the intake manifold is felt with finger.
NOTEAt this time, the plunger
Ian the positive crankcase ventila-
tion valve moves back and forth.
(3) If negative pressure is not felt, clean or replace the positivecrankcase ventilation valve.
POSITIVE CRANKCASE VENTILATION VALVE
INSPECTION(1) Remove the positive crankcase ventilation valve.
(2) Insert a thin stick into the positive crankcase ventilation
valve from the threaded side to check that the plunger
moves.(3) If the plunger does not move, the positive crankcase
ventilation valve is clogged. Clean it or replace.
INSTALLATION
Install the positive crankcase ventilation valve and tighten to
specified torque.
iSpecified tightening torque: 8-12 Nm
(8-8.5 ft.lbs.)

EMISSION CONTROL SYSTEMS- Evaporative Emission Control SYStem25-m
PURGE CONTROL SYSTEM INSPECTION NZ5lBEK
sensor
P+
Engine control unit
IlEM0086(1) Disconnect the vacuum hose (red stripes) from the throttle
body and connect it to a hand vacuum pump.
(2) Plug the nipple from which the vacuum hose is discon-
nected.(3) Under the engine conditions shown below, check by
applying vacuum from a hand vacuum pump.
When engine is cold-engine coolant temperature:
60% (140°F) or less
Engine operating Applying vacuum
>When engine is hot-engine coolant temperature:
70°C (158°F) or higher
Engine operating
condition
Idling3,000 rpm within
three minutes afterstarting engine
3,000 rpm after
three minutes
have elapsedafter starting
engineApplying vacuum
375
mmHg(14.8 in.Hg.1
Try wpMwvacuum375
mmHg(14.8 in.Hg.1
ResultVacuum is maintained
Vacuum leaks
Vacuum will be main-
tained momentarily,
after which it will
leaks.
NOTEThe vacuum will leak
continuously if the
altitude is 2,200
m(7,200 ft.) or higher,or the intake air
temperature is
50°C(122°F) or higher.

25-12EMISSION CONTROL SYSTEMS -Evaporative Emission Control System
PURGE CONTROL SYSTEM INSPECTION
Canister
6EM0215
(1) Disconnect the purge air hose from the air intake hose, andplug the air intake hose. Then, connect the hand vacuum
pump to the purge air hose.
(2) Under the engine conditions shown below, check by
applying vacuum from a hand vacuum pump.
When engine is cold-engine coolant temperature:
60°C (140°F) or less
Engine operating Applying vacuum
11When engine is hot-engine coolant temperature:
70°C (158°F) or higher
Engine operating Applying vacuum
condition
Result
Idling375 mmHg(14.8 in.Hg.)Vacuum is maintained
3,000 rpm within Try applying
three minutes after vacuum
starting engineVacuum leaks
3,000 rpm after375
mmHgVacuum will be main-
three minutes(14.8 in.Hg.1tained momentarily,
have elapsedafter which it will
after startingleaks.
engineNOTEThe vacuum will leak
continuously if the
altitude is 2,200
m(7,200 ft.) or higher,
or the intake air
temperature is
50°C(122°F) or higher.

25-14EMISSION CONTROL SYSTEMS- Evaporative Emission Control System
(5) Measure the resistance between the terminals of the
solenoid valve.
Standard value: 36-44
Q [at 20°C (68OF)]_
6EM137
AIR FLOW SENSOR, ENGINE COOLANT TEMPER-
ATURE SENSOR AND INTAKE AIR TEMPERA-
TURE SENSORTo inspect these parts, refer to GROUP
14-MPI System
Components.‘.
AIR CONDITIONER SWITCHTo inspect the air conditioner switch, refer to GROUP
24’--AirConditioner Switch.
OVERFILL LIMITER (TWO-WAY VALVE)N2BlBE&To inspect the overfill limiter (two-way valve), refer to GROUP
14-Fuel Tank.
CANISTERNzslBmTo inspect the canister, refer to GROUP
14-Fuel Line and
Vapor Line.
FUEL FILLER CAP INSPECTIONNZSIBJACheck the gasket of the fuel filler cap, and, the filler cap itself,
for damage or deformation; replace the cap if necessary.

EMISSION CONTROL SYSTEMS- Exhaust Gas Recirculation (EGR) Svstem254 7
EGR SYSTEM INSPECTION Canada-2.0L DOHC Engine>N25lCJMa(1) Disconnect the vacuum hose (green stripe) from the
throttle body, and connect a hand vacuum pump to the
vacuum hose.
(2) Plug the nipple from which the vacuum hose is discon-
nected.(3) Under the engine conditions shown
below, check by
applying vacuum from a hand vacuum pump.
When Engine is
Cold-engine coolant temperature
40°C (104°F) or below
Engine operating
conditionApplying vacuum
Result
I
IdlingTry awMngVacuum leaksvacuumIWhen Engine is
Hot-engine coolant temperature
80°C (176°F) or higher
Engine operating
conditionApplying vacuum
Result
Idling45
mmHg(1.8
in.Hg.1Vacuum is maintained
Changes from
idling to slightly
unstable215
mmHg(8.5
in.Hg.1Vacuum is maintained
EGR SYSTEM INSPECTION N25lCJN
(1) Disconnect the vacuum hose (green-striped) from the EGRvalve, and connect the hand vacuum pump through the
three-way terminal.
(2) Regarding cold condition [coolant temperature:
20°C (68°F)or less] and warm condition [coolant temperature:
70°C
(68°F) or more] of the engine, check the following two
points:
Engine operation
Normal state
Race the engine byThe negative pressure does
rapidly press in the
not vary.accelerator pedal.(Atmospheric pressure)

Engine operationNormal state
Race the engine by
rapidly press in the
accelerator pedal.The negative pressure rises
to
100 mmHg (3.9 in.Hg.1 ormore.(3) Disconnect the three-way terminal, and connect the hand
vacuum pump to the EGR valve.
(4) When a negative pressure of 215
mmHg (8.5 in.Hg.) is
applied during idling, check that the engine stops or idles
unstably.

25-18EMISSION CONTROL SYSTEMS- Exhaust Gas Recirculation (EGRI System
EGR VALVE .8L Engine>N25lCKI
INSPECTION(1) Remove the EGR valve and check it for sticking, deposit of
carbon, etc.
If such condition exists, clean with adequate solvent to
ensure tight valve seat contact.
(2) Connect a hand vacuum pump to the EGR valve.
(3) Apply a vacuum of 500 mmHg (19.8
in.Hg.) and check
air-tightness.
(4)Blow in air from one passage of the EGR to check conditionas follows.
IApplying vacuumIResultI
I45 mmHg (1.8 in.Hg.1 or less1 Air does not blow through 1215
mmHg (8.5 in.Hg.1 or more Air blows through
INSTALLATION
Install a new gasket and EGR valve, tighten bolts to specified
torque.Specified tightening torque:
< 1.8L Engine>lo-15 Nm (7.2-10 ft.lbs.)
<2.0L DOHC Engine>15-22 Nm (lo-155 ft.lbs.)
THERM0 VALVE 2.0L DOHC Engine>NZHCNGb
INSPECTION(1) Disconnect the vacuum hoses from the therm0 valve, and
connect a hand vacuum pump to nipple of the therm0
valve.(2) Apply a vacuum and check the air passage through thetherm0 valve.
REMOVAL
(1) When removing the therm0 valve, do not use wrenches or
other tools on the resin part.
(2) When disconnecting the vacuum hoses, put a mark on the
hose so that it may be reconnected at original position.
INSTALLATION(1) Apply specified sealant to the threads of therm0 valve and
tighten to specified torque. When installing the therm0
valve, do not use wrenches or other tools on the resin part.Specified sealant:
MOPAR Part No.4318034 or equivalent
Specified torque:
20-40 Nm (15-30 ftlbs.)(2) Reconnect the vacuum hoses in position.
‘I