1990 MITSUBISHI SPYDER Service Repair Manual

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Page 785 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual Emission
ENGINE AND EMISSION CONTROL
GENERAL INFORMATION
The emission control system consists of the following sub-systems:
l Positive crankcase ventilation system
l Evaporative emi

Page 786 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual 17-46ENGINE AND EMISSION CONTROL
VACUUM HOSES
VACUUM HOSE
Two wayvalve
II
To heater and
control
EVAPcanister
Vent
EVAP
solenoid
T oengine block
EVAPem i s s i o nBack pressure EGR andelect

Page 787 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual Emission
ENGINE AND EMISSION
VACUUM CIRCUIT
.
DIAGRAM
intake air plenum
b o d y
To combustion
Electric EGRtransducer
EGR valve
EVAPcanister
EVAPpurge solenoid
(ON: open)
V A C U U M H O

Page 788 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual Emission Control System
ENGINE AND EMISSION CONTROL Engine
POSITIVE CRANKCASE VENTILATION SYSTEM
GENERAL INFORMATION
The positive crankcase system (PCV)
prevents the escape of blow-by

Page 789 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual Emission
ENGINE AND EMISSION CONTROL (Non-turbo)>
CRANKCASE, CHECK’
Remove the rocker cover side’ of the PCV
2. Start the engine and run at idle. ,
Positive
Positive
crankcase
ve

Page 790 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual ENGINE AND EMISSION CONTROL
EVAPORATIVE EMISSION CONTROL SYSTEM17300510271
GENERAL INFORMATION
The evaporative emission control system prevents
the emission of fuel tank vapors into

ENGINE AND EMISSION CONTROL
EVAPORATIVE EMISSION CONTROL SYSTEM17300510271
GENERAL INFORMATION
The evaporative emission control system prevents
the emission of fuel tank vapors into the atmo-
sphere. When fuel evaporates in the fuel tank,
the vapors pass through vent hoses or tubes to
the charcoal filled EVAP canister. The EVAP canis-
ter temporarily holds the vapors. Through the EVAP
OPERATION
The EVAP purge solenoid regulates the rate of
vapor flow from the EVAP canister to the throttle
body. The PCM controls solenoid operation.
During the cold start warm-up period and the hot
start time delay, the PCM does not energize the
solenoid.When de-energized, no vapors are
purged. The PCM de-energizes the solenoid during
open loop operation.
The engine enters closed loop operation after it
reaches a specified temperature and the
COMPONENT LOCATION
Evaporative emission purge solenoidpurge solenoid, the power-train control module
(PCM) allows intake manifold vacuum to draw va-
pors into the combustion chambers during certain
engine operating conditions. The plunger solenoid
regulates vapor flow from the canister to the engin e.
grammed time delay ends. During closed loop
operation, the PCM energizes and de-energizes
the solenoid approximately 5 to 10 times per se-
cond, depending on operating conditions. The PCM
varies the vapor flow rate by changing solenoid
pulse width. Pulse width is the amount of time
the solenoid de-energizes.
Revision
I 1PURGE CONTROL SYSTEM CHECK
1.Disconnect the vacuum hose from the throttle body a nd
connect it to a hand vacuum pump.
2. Plug the nipple where the vacuum hose was remove d.
3. When the engine is at operating temperature [Eng ine
coolant temperature: or higher], apply vacu-
um at idle to check the condition of the engine and the
vacuum.
Vacuum Engine status Normal condition
53
(15.7 right after starting
engine is
or moreVacuum leaks
, seconds later

Page 791 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual Emission
ENGINE AND CONTROL
Vacuum
Engine speed
AFUOO
PURGE PORT VACUUM CHECK
1.Disconnect the vacuum hose from the throttle body purge
vacuum nipple and connect a hand vacuum

Page 792 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual ENGINE AND EMISSION CONTROL
ENGINE COOLANT TEMPERATURE SENSOR
AND INTAKE AIR TEMPERATURE SENSOR
To check these parts, refer to GROUP Troubleshooting.
AIR CONDITIONING SWITCH173002

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