1991 MITSUBISHI ECLIPSE coolant temperature

HEATERS AND AIR CONDITIONING - Service Adjustment Procedures 24-25
16A1077
20AO499
CONDENSER FAN MOTOR HIGH-LOW SELECTING RELAYCheck for continuity between the
term,inals when the battery
power-supply is applied to terminal
(5), and terminal (3) is
grounded.
IWhen current flows1 Between terminals l-2 1 Continuity1When no current
flows
IDLE-UP OPERATION CHECKN24FoAA
(I) Before inspection and adjustment set vehicle in the
following condition:
l Engine coolant temperature:
80-90°C (176-194°F)
lLights, electric cooling fan and accessories: Set to OFFl Transaxle: Neutral
(N or P for vehicles with A/T)l Steering wheel: Straightforward
(2) Check whether or not the idling speed is the standard
value.Standard value:
4.8L Engine>700 rpm
<2.0L DOHC Engine>750 rpm
NOTE
There is no necessity to make an adjustment, because theidling speed is automatically adjusted by the
ISC” system.
If, however, there occurs a deviation from the standard
value for some reason, check the
ISC” system.
(3) Check to be sure that the idlig speed becomes the standardvalue when the air conditioner switch is switched ON and
the air conditioner is activated.
Standard value: 850 rpm
NOTE
There is no necessity to make an adjustment, because theidling speed is automatically adjusted by the
ISC” system.
If, however, there occurs a deviation from the standard
value for some reason, check the
ISC” system.
ISC: Idle Speed Control

HEATERS AND AIR CONDITIONING- Engine Coolant Temperature Switch24-51
ENGINE COOLANT TEMPERATURE SWITCH <2.0L DOHC Engine>
-.REMOVAL AND INSTALLATIONN24xA-
1 to GROUP f-service Adjust-1ment Procedures.)
22-28
ft.lbs.
Removal steps1. Engine coolant temperature switch
connector (2-pin)
.4 2. Engine coolant temperature switch(always-closed type)
NOTE(1) Reverse the removal procedures to reinstall.(2) l 4 : Refer to “Service Points of Installation”.
20A0190I
INSPECTIONN24XcAAENGINE COOLANT TEMPERATURE SWITCH
(ALWAYS-
CLOSED TYPE CHECK)
(1) Remove the engine coolant temperature switch from the
water outlet fitting.
(2) Immerse the engine coolant temperature switch in oil and
heat by a gas stove or similar method so as to increase theoil temperature.
(3) Check to be sure that the engine coolant temperature
switch is switched OFF when the oil temperature reaches
the standard value.
Standard value:
112- 118°C (233-244°F)
CautionUse engine oil for this test; stir it well while heating,
and do not heat more than necessary.
SERVICE POINTS OF INSTALLATIONN24XDM2. INSTALLATION OF ENGINE COOLANT TEMPERATURE
SWITCH (ALWAYS-CLOSED TYPE)
Apply a coating of the specified sealant to the threaded
parts and then install the engine coolant temperature
switches.
Specified sealant: MOPAR Part No.4318034 or ewiva-lent

.^
EMISSION CONTROL
SYSTEMS
CONTENTSN25AA-
CATALYTICCONVERTER...............................20CRANKCASE EMISSION CONTROL
SYSTEM...........................................................7Components Location
...................................7Crankcase Ventilation System
Inspection......................................................8Positive Crankcase Ventilation Valve
...........8EVAPORATIVE EMISSION CONTROL
SYSTEM...........................................................9
AirConditionerSwitch.................................14Air Flow Sensor, Engine Coolant
Temperature Sensor and Intake Air
Temperature Sensor
.....................................14
Canister.........................................................14Components Location
...................................9
FuelFillerCapInspection............................14Overfill Limiter (Two-way Valve)
..................14
PurgeControlSolenoidValve......................13Purge Control
SystemInspection................11
PurgeControlValve.....................13EXHAUST GAS RECIRCULATION (EGR)
SYSTEM...........................................................15Air-fuel Ratio Control (MPI) System
............20Components Location
...................................15EGR Control Solenoid Valve

.................................................19
EGR
SystemInspection...............................17EGR Temperature Sensor
......19
EGR Valve.....................................................18
Therm0 Valve 2.0L DOHC Engine>...................................18
SPECIFICATIONS.............................................2General Specifications
..................................2
Sealant..........................................................2Service Specifications
...................................2
TorqueSpecifications...................................2
TROUBLESHOOTING......................................3
VACUUMHOSES...........................................4
VacuumHosesRouting...............................4

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.

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.