check engine MITSUBISHI ECLIPSE 1990 User Guide

FUEL SYSTEM -Fuel Supply and Fuel Pressure Control
FUEL-PRESSURE CONTROL VALVE
14-11To fuel
-
Fuel-pressureregulatorFuel-pressurecontrol valve
Intake-airEnginecontrol
unit
Usually, the negative pressure (vacuum) of the
intake manifold is applied to the fuel-pressure
regulator, and, because the fuel pressure is thus
held at a fixed constant level relative to the pressure
within the intake manifold, the amount to fuel
injected is regulated so as to be proportional to the
injectors’ actuation time. If, however, the engine
coolant-temperature and the intake air temperature
are high when then engine is started, the engine
control unit sends a flow of current to the fuel-
pressure control valve, with the result that outside
air (atmospheric) pressure acts upon the fuel-
pressure regulator.
0Fuel ump
1chec terminal 1!Fuel pumpAs a result. the
fuel pressure is increased and the
generation of fuel vapors caused by high tem-
perature is suppressed, thereby maintaining idling
stability immediately after restarting under
high-temperature conditions.
Note that there is a return to the usual fuel pressure
level after two minutes or more have passed after
starting is completed.
In addition, the circuitry of the fuel-pressure control
valve. is interrupted, thus controlling so that the fuel
pressure corresponds to supercharging pressure,
under high-load driving conditions (during super-
charged driving by the turbocharger).
FU,EL PUMP CHECK TERMINAL
This terminal is for directly driving the fuel pump.
By applying the battery voltage directly to this terminal, you can
check fuel pump operation or check fuel leaks from the
fuel
line.
__. - ---

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14-28FUEL SYSTEM- Ennine Control Unit
The engine control unit has an
onboard diagnosis
function, which is used mainly to diagnose the
sensors, thus facilitating system checks and troub-leshooting. It also has a fail-safe/backup function tc
ensure passenger and vehicle safety.
Onboard self-
diagnosisMainly for detecting failure of sensors
and foroutputting diagnosis code.
for detecting failure of sensors, etc. related
toemission control and to turn ON warning light
(Malfunction indicator light).
> Codes can be read by voltmeter.
ENGINE CHECK light is turned
2 ON.
The engine control unit is mounted in the passenger compart-
ment, at the location indicated in the illustration.,

FUEL SYSTEM - Engine Control Unit14-31
r
L
IMPI
Ground
1 Engine control unit
Engine wam-
$b?Stionindicator
light)The diagnosis connector is located next to the junction block.
By connecting a voltmeter between the
No.1 and No.12terminals of the diagnosis connector, the meter pointer will
deflect according to the output pattern shown before so that
the diagnosis code can be read.
To clear the diagnosis codes that are stored in the memory,
disconnect the
.battery ground cable for 10 seconds.
When a malfunction is detected in items related to emission
control (items marked
Q in the table), the engine warning light
(Malfunction indicator light) is illuminated to warn the driver of
the necessity for an engine check.
When the malfunction is corrected, the light goes off. The light
also goes off when the ignition switch is turned OFF. At that
time, it will not come on when the ignition switch is turned ON
unless a malfunction is detected again.
However, the light remains on for
E.5 seconds, after the
ignition switch is turned on. This is to allow the driver to check
that the engine warning light circuit is operating normally.

23-18BODY -Body Color Code / Body Color Code Interpretation / Solid
izsiii
Noofl -ENGINE -TNANS I
coLm %F
-T-iI/IBody color code0010163BODY COLOR CODE
The body color code is imprinted on the vehicle information
code plate, which is mounted on the front deck.
BODY COLOR CODE INTERPRETATION
The information contained in the body color code is explained inthe body color parts.
BODY COLOR
Check the vehicle’s body color code, and then use this body color chart to determine the refinishing paint ___
supplier from which the color can be purchased.(M): Metallic paint
(P): Pearl tone paint
B”%d:‘orBody colorColor numberBody color nameEngine compartment and
lug-gage compartment color
Color numberColor name
,814
H18
Rll
R33
w12 _c
BLUE (MI
UGRAY (Mvt)
RED
RED (MI
WHITE
AC10814
AC10818
AC1081 1
AC10833
AC10812Bright Blue
(MI
LT. Mynx
Diamond Star (MI
Flash Red
Raspberry Red (MI
Bright White
BLACKAC10813Black
n R16
T81
T93
D/RED (PIAC10916
D/BLUE (Ml
AC1 0881
TURQUOISE (MIAC 10893
SOLID
i
Common solid,Solid on this vehicleISolid on this vehicle has one more layer of a clear coat on the
Itop coating to increase depth and luster.
IAs for coating operation, this solid is applied by the samf
-”procedure as metallic coat.
I Pre-treatmentElectrodeposition coating

__..--. -._ _^__. __--- -._ _..EMISSION CONTROL SYSTEMS
- Evaporative Emission Control Svsvem25-l 1
,VAPORATlVE EMISSION CON-
TROL SYSTEMIn order to prevent the escape of fuel vapor from the
fuel system into the atmosphere. the evaporative
emission control system consists of a charcoal
canister, a purge control solenoid valve, etc.
When the fuel vapors generated inside the fuel tank
fill the tank, they press and open the overfill limiter’s
valve and pass to the canister, where they are
absorbed into and accumulated by the charcoal.
Because the purge control solenoid valve is ON
(open) when the engine is running, as a
conse-
Non-TurboAir cleaner
Fuel injector
Canister
Charcoal
/Purge control tsolenoid valve r
RZSGAAB
quence of the purge air being taken in from the
canister in accordance with the intake negative
pressure (vacuum), the fuel vapors accumulated in
the canister are taken from the charcoal and are alsotaken into the intake manifold.
Note that the purge control solenoid valve is OFF
(closed) when the engine is cold and during idling,
and so fuel vapors are not taken into the intake
manifold at that time.
Overfill
limiter(Two-way valve)
Fuel check valveFilter
- Fuel vapor
*---- Purge air

25-12EMISSION CONTROL SYSTEMS- Evaporative Emisson Control System-
TurboPurge control valve
/Air cleaner
Canister
-Charcoal-ITurbo-
chargerPurge control
solenoid valve
Fuel check valve
Thermal expansion
Fuel gauge unit
Filter
- Fuel vapor
- - - - Purge air
BEMO211
%-E?”solenoidvalve
Charcoal -fuel tank
CANISTERWhile the engine is inoperative, fuel vapors generated
insidEthe fuel tank are absorbed and stored in the canister.
When the engine is running, the fuel vapors absorbed in
thfcanister are drawn into the throttle body through the
purgecontrol solenoid valve.
Atmosphere
L- Filter03Roo3E