MITSUBISHI SPYDER 1990 Service Repair Manual

ENGINE AND EMISSION CONTROL
Engine (Non-turbo)> (Turbo) and
Powertrain control module removal
steps Engine (Non-turbo)>
l Air cleaner22. Powertrain control module bracket23. Powertrain control module
Auto-cruise removalsteps Engine (Turbo) and Engine>
l side
Auto-cruise control main switch
removat steps
25. Instrument panel switch 26. Auto-cruise control main
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17-42ENGINE AND EMISSION CONTROL Auto-cruise Control System
CAUTION:Beforeremoval of air bag module and clock spring, refer t o the following sections:GROUP SRS Service Precautions.GROUP Air Bag Modules Clock Spring.
5.9 Nm4.3
41Nm30
2 8
Auto-cruise control switch and
clock spring
steps
27. Air bag module (Refer to GROUP
Bag
Modules and Clock Spring.)
28. Auto-cruise control
29. Steering wheel
30. Steering column upper cover
31. Steering column lower cover
l
under cover (Refer to
GROUP Panel.)
32. Clock spring (Refer to GROUP
Bag
Modules and Clock Spring.) 3 8
Sensor removal steps
33. Throttle position sensor
Engine (Turbo) and Engine>
34. Transaxle range switch
Engine (Non-turbo) 35. Park/neutral position switch Engine AA and Engine
36. Stop light switch
37. Clutch pedal position switch
Engine (Turbo) M/T and Engine 38. Vehicle speed sensor Revision

ENGINE AND EMISSION CONTROL Control
INSPECTION. .
AUTO-CRUISE CONTROL MAIN SWITCH CHECK
SwitchTerminal No.
ON0
0 0
AUTO-CRUISE CONTROL SWITCH CHECK
17200120082
Measure the resistance between the terminals when e ach
of the SET, RESUME and CANCEL switches is pressed.
If the values measured at this time correspond to t hose in
the table below, then there is no problem.
Switch position Resistance between terminals
Switch OFFNo continuity
CANCEL switch ONApprox. 0
RESUME switch ONApprox. 820
SETswitch ONApprox. 2,700
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ENGINE AND EMISSION CONTROL Auto-cruise System’,
AUTO-CRUISE CONTROL INDICATOR CHECK 17200190052
(1) Remove the combination meter.(Refer to GROUP 54
Combination meter.)
(2) Check the continuity between terminals (10) and (16).
If there is no continuity, replace the auto-cruise control
indicator.
CLOCK SPRING CHECK
Refer to GROUP Air Bag Module and Clock Spring.
THROTTLE POSITION SENSOR CHECK
Engine
(Turbo) and
Engine>17200290011
Refer to GROUP On-vehicle Service.
VEHICLE SPEED SENSOR CHECK Engine
(Non-turbo) A/T>, INPUT SPEED SENSOR OR OUTPUT
SPEED SENSOR CHECK
Engine (Non-turbo)
Refer to GROUP 54 Combination Meter.
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Emission
ENGINE AND EMISSION CONTROL
GENERAL INFORMATION
The emission control system consists of the following sub-systems:
l Positive crankcase ventilation system
l Evaporative emission control system
l Exhaust emission control system
SERVICE SPECIFICATIONS
Evaporative emission purge solenoid coil resistance
[at
Electric EGR transducer solenoid coil resistance
[at
Standard value
25-35
.
2 5 - 3 5
TROUBLESHOOTING17300070052
Symptom Probable causeRemedy,
Engine will not start or
Vacuum hose disconnected or damaged. replace is hard to start.
The EGR valve is not replace
Malfunction of the evaporative emission purge or solenoid.
Rough idle or engineThe EGR valve is not closed. Repair or replace
stalls.Vacuum hose disconnected or damaged.Repair or replace
Malfunction of the crankcase ventilationReplace
valve.
Malfunction of the purge control system.
Checkthe system; if there is a prob-
lem, check its component
Engine hesitates or
poor acceleration.
Excessive oil
sumption.
Poor fuel mileage.
Malfunction of the exhaust gas recirculation
system.
Positive crankcase ventilation line clogged.
Malfunction of the exhaust gas recirculation
system.
Check the system; if there is a
check its component parts.
Check positive crankcase ventilation
system.
Checkthe system; if there is a
check its component parts.
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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 andelectric EGR transducer s o l eassembly
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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 S E C H E C K
1.Using the VACUUM HOSE ROUTING as a guide, check that
the vacuum hoses are correctly that there are
no bends or damage to the hoses.
VACUUM HOSE
1.When connecting the vacuum should securely
inserted onto the nipples.
2.To connect the hoses correctly, use the VACUUM HOSE POUT-
ING as a guide.

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
from inside
the crankcase into the atmosphere.
Fresh air is sent from the air cleaner into the
case through the breather hose, to be mixed with the blow-by gases inside the crankcase.
The blow-by gas inside the crankcase is drawn
into the intake manifold through positive crank-
case ventilation valve.
The plunger inside the positive crankcase
tion valve is designed to lift according to intake
manifold vacuum, regulating the flow of blow-by.
The blow-by gas flow is decreased during low load
engine operation to maintain engine stability, and
is increased during high load operation to improve
the ventilation performance.
SYSTEM DIAGRAM
Positive crankcase
Positive crankcaseventilation valve
ventilation valve
Ventilation hose
Ventilation hose Breather hose
Breather hose
COMPONENT LOCATION
Positive crankcase ventilation valve
Valve
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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
ventilation
Positive crankcase
ventilation3.Place a finger at the opening positive
ventilation valve and of the
manifold is felt.
NOTE
At this time, the plunger in the positive crankcase ventila-
tion valve moves forward and: backward.
4. If vacuum is not felt, replace the PCV valve.
POSITIVE CRANKCASE VALVE
CHECK
1. Insert a thin rod into the positive
valve from the side shown in the illustration (rock er cover
installation side), and move the rod back forth to
confirm that the plunger moves.
2. If the plunger does not move, the valve is clogged. In
this case, clean or replace, the valve.
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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