1989 MITSUBISHI GALANT Service Repair Manual

EMISSION CONTROL SYSTEMS -Evaporative Emission Control System17-21EC1510
6EM137
EVAPORATIVE EMlS$lON
PURGE SOLENOID
INSPECTIONM17lBFD
NOTE
When disconnecting the vacuum hose, make an identification
mark on it so that it can be reconnected to the original posi-
tion.
(1) Disconnect the vacuum hoses (non stripe and red stripe
hoses) from the solenoid valve
(2) Disconnect the harness connector from solenoid valve.
(3) Connect a hand vacuum pump to the nipple to which the red-striped vacuum hose was connected.
(4) Apply a vacuum and check for air-tightness when voltage applied directly to the evaporative emission purge solenoid
when the voltage is discontinued.
Battery voltageResult
Non-Turbo When appliedVacuum leaks
When discontinued Vacuum is maintained
TurboWhen appliedVacuum is maintained
When discontinued Vacuum leaks
(5) Measure the resistance between the terminals of the sole-
noid valve.
Standard value: 36-44 Q [at 20°C (68”F)l
VOLUME AIR FLOW SENSOR, ENGINE
COOLANT TEMPERATURE SENSOR AND
INTAKE AIR TEMPERATURE SENSOR
M17IBGB
To inspect these parts, refer to GROUP 13-On-Vehicle Inspec-
tion of
MFI Components.
AIR CONDITIONING SWITCH Ml7IBHB
To inspect the air conditioning switch, refer to GROUP
55-Air
Conditioning Switch.
FUEL TANK PRESSURE CONTROL VALVE MI’IIBEB
To inspect the fuel tank pressure control valve, refer to GROUP
13-Fuel
Tank.
EVAPORATIVE EMISSION CANISTERM17lBlB
To inspect the evaporative emission canister, refer to GROUP
13-Fuel Line and Vapor Line.
FUEL TANK FILLER TUBE CAP INSPECTIONM,7,w~
Check the gasket of the fuel tank filler tube cap, and the filler
cap itself, for damage or deformation; replace the
cap if neces-
sary.
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17-22EMISSION CONTROL SYSTEMS -Exhaust Gas Recirculation (EGR) System
EXHAUST GAS RECIRCULATION (EGR) SYSTEM
COMPONENT LOCATION

Name
EGR solenoid
EGR valve
EGR temperature sensor
Thermal vacuum valve
Symbol
D
B
C
A
\ temperature
-, ‘F-$
3
i
bEM0148
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EMISSION CONTROL SYSTEMS -Exhaust Gas Recirculation (EGR) System17-23

INameISymbol 1
IEGR solenoid I D I
EGR valve
EGR temperature sensor
B
C
1 Thermal vacuum valve 1 A 1
\
. ,6FUl93~
I
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17-24EMISSION CONTROL SYSTEMS- Exhaust Gas Recirculation (EGR) System

Name
EGR solenoid
EGR valve
EGR temperature sensor
Thermal vacuum valve
Symbol
D
B
C
A
6EM0166
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EMISSION CONTROL SYSTEMS -Exhaust Gas Recirculation (EGR) System17-25
1
.

EGR SYSTEM INSPECTION Ml7ICJF
(1) Disconnect the vacuum hose (green stripe) from the throttle body, and connect a hand vacuum pump to the
vacuum hose.
(2) Under the engine conditions described below, provide a
vacuum by using the hand vacuum pump, and then check.
WhenEngine is Cold-
coolant temperature 50°C (122°F) or below
Engine operatingconditionApplying vacuumResul
t
IdlingTry applying vacuum Vacuum leaks
When Engine is Hot-
coolant temperature 85”-95°C (185”-205°F) or higher
Engine operatingconditionApplying vacuumResult
Idling45 mmHg(1.7 in.Hg.1Vacuum is maintained
Changes from
idling to slightlyunstable
Vacuum is maintained
EGR SYSTEM INSPECTION
(1) Disconnect the vacuum hose (green striped hose) from the exhaust gas recirculation
(EGR) valve, and then connect a
manual vacuum pump via the three-way terminal.
(2) Check the following points when the engine is cold [enginecoolant temperature is
20°C (68°F) or below] and when the
engine is warm [engine coolant temperature is
70°C (158°F)
or higher].
116EMOZW
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17-26EMISSION CONTROL SYSTEMS- Exhaust Gas Recirculation (EGR) System

~

I6EM0224 1
(3) Disconnect the three-way terminal and connect the manual
vacuum pump directly to the exhaust gas recirculation
(EGR) valve.
(4) Check whether the engine stalls or the idling is unstable
when a vacuum of 155 mmHg (5.9 in.Hg) or higher is
applied during idling.
EGR VALVE CONTROL VACUUM
INSPECTION M17WBB
Engine coolant temperature: 85-95°C

(185-205°F)
(1) Disconnect the vacuum hose from the throttle body EGR
vacuum nipple and connect a hand vacuum pump to the
nipple.
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EMISSION CONTROL SYSTEMS -Exhaust Gas Recirculation (EGR) System1 T-27
1 /]
LEngine speed (rpm)
lFU446
4zJ -6EM159
(2) Start the engine and check to see that, after raising the
engine speed by racing the engine, vacuum raises prop-
ortionately with the rise in engine speed.
NOTE
if there is a problem with the change in vacuum, it is
possible that the throttle body port may be clogged and
require cleaning.
EGR VALVE
INSPECTION MI’IICKF
(1) Remove the EGR valve and check it for sticking, deposit of
carbon, etc.
If such condition exists, clean with adequate solvent to en-
sure tight valve seat contact.
(2) Connect a hand vacuum pump to the EGR valve.
(3) Apply a vacuum of 500 mmHg (19.6 in.Hg.) and check air
tightness.
(4)Blow in air from one passage of the EGR to check condition
as follows.
INSTALLATION
(1) Install a new gasket and EGR valve, tighten bolts to
specified torque.
Specified tightening torque: 17-26 Nm (12-19 ft.lbs.1
THERMAL VACUUM VALVE Y~JICNG
INSPECTION
(1)Disconnect the vacuum hoses from the thermal vacuum
valve, and connect a hand vacuum pump to nipple of the
thermal vacuum valve.
(2) Apply a vacuum and check the air passage through the
thermal vacuum valve.

17-28EMISSION CONTROL SYSTEMS -Exhaust Gas Recirculation (EGR) Svstem
n
7@
REMOVAL
(1) When removing the thermal vacuum valve, do not use
wrenches or other tools on the resin part.
(2) When disconnecting the vacuum hose, put a mark on thehose so that it may be reconnected at original position.
INSTALLATION
(1) Apply specified sealant to the threads of thermal vacuumvalve and tighten to specified torque. When installing the
thermal vacuum valve, do not use wrenches or other tools
on the resin part.
Specified sealant: 3M
NUT Locking Part
No.4171 or equivalent
Specified torque:
20-40 Nm (15-30 ft.lbs.)
(2) Reconnect the vacuum hose as it was before.
EGR TEMPERATURE SENSOR Ml’IICZB
INSPECTION
(1) Remove the EGR temperature sensor.
(2) Place the EGR temperature sensor in water, and then
measure the resistance value between terminals 1 and 2
while increasing the water’s temperature.
Replace the EGR temperature sensor if there is a signifi-
cant deviation from the standard value.
INSTALLATION
(1) Install the EGR temperature sensor, tighten to specified
torque.
Specified tightening torque:
lo-12 Nm (7.3-8.6 ft.lbs.1
EGR SOLENOID
INSPECTION
NOTE
Ml7ICRB
When disconnecting the vacuum hose, make an identification
mark on it so that it can be reconnected to the original posi-
tion.
(1) Disconnect the vacuum hoses (yellow and green stripe)
from the solenoid valve.
(2) Disconnect the harness connector.
(3) Connect a hand vacuum pump to the nipple to which the
green-striped vacuum hose was connected.
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