MITSUBISHI 3000GT 1991 Service Manual

EMISSION CONTROL - Evaporative Emission Control System17-7
PURGE CONTROL SYSTEM INSPECTION <Non Turbo>M17lBBP
Barometric pressure sensor
Engine control unit
7EM0161I-----I
\7EM0140t
(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°C (140°F) or less
When engine is hot
-engine coolant temperature:
70°C (158°F) or higher
Engine operatingcondttionApplying vacuumResult
ldllng375 mmHg(14.8 In.Hg)Vacuum is maintalned
I
after staitingengineNOTEThe vacuum will leak con-tenuously if the altitudeis 2,200 m (7.200 ft.) or
higher, or the intake airtemperature is 50°C(I 22°F) or higher.TSB Revision

17-8EMISSION CONTROL - Evaporative Emission Control System
PURGE CONTROL SYSTEM INSPECTION <Turbo>M17IBBQ
Canister
Purge control
valve\
PI IrnQ rnntrnlI.1 I
kXffo~~~~r~~ ’ I I-J
relay
Barometric pressure sensor
Intake air temperature sensor
Engine coolant temperature sensor
II1 I IAir flow sensor
Engine control unit
6EM0215(1) Disconnect the purge air hose from the air intake hose, and
plug 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
conditionApplying vacuumResult
Idling
375 mmHgVacuum is maintained
3,000 rpm(14.8 in.Hg)When engine is hot
-engine coolant temperature:
70°C (158°F) or higher
Engine operating
condition
Idling
3,000 rpm within
three minutes after
starting engine
3,000 rpm after
three minutes
have elapsedafter startingengine
Applying vacuum
375
mmHg(14.8 in.Hg)
Try applyingvacuum
375
mmHg(14.8 in.Hg)
Result
Vacuum is marntained
Vacuum leaks
Vacuum WIII be main-tained momentarily, after
which it will leak.
NOTEThe vacuum WIII leak con-
tinuously if the altitude
is 2,200 m
(7,200 ft.) orhrgher. or the Intake arrtemperature is 50°C(122°F) or higher.
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EMISSION CONTROL - EvaporativeEmission Control System
Purge/-----hose -----PURGE PORT VACUUM CHECK
Check Condition
17-9
M17lBKDEngine coolant temperature: 80
- 95°C (176 - 205°F)
(1) Disconnect the vacuum hose from the throttle body purge
hose nipple and connect a hand vacuum pump to the
nipple.
Ez8>
Engine speed (rprd3FU262(2) Start the engine and check to see that, after raising the
engine speed by racing the engine, vacuum remains fairly
constant.
NOTEIf there is no vacuum created, it is possible that the throttle
body port may be clogged and require cleaning.
PURGE CONTROL VALVE <Turbo>
INSPECTIONMl7IBCE
(1) Remove the purge control valve.
(2) Connect a hand vacuum pump to the vacuum nipple of the
purge control valve.
(3) Apply a vacuum of 400 mmHg (15.7
in.Hg.1 and check
airtightness.
(4) Blow in air lightly from the canister side nipple and check
conditions as follows.
IHand vacuum pump vacuumINormal conditionI
I0
mmHg (0 in.Hg.1Air does not blow through
(No vacuum is applied)
I ..200 mmHg (8.0 in.Hg.) or more1Air blow throughI(5) Connect a hand vacuum pump to the positive pressure
nipple of the purge control valve.
(6) Apply a vacuum of 400 mmHg (15.7
in.Hg.1 and check
airtightness.
PURGE CONTROL SOLENOID VALVE
INSPECTION
NOTEMl7lBFI
When disconnecting the vacuum hose, make an identification
mark on it so that it can be reconnected to the original position.
(I) Disconnect the vacuum hoses (non stripe and red stripe
hose) 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.
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17-10EMISSION CONTROL - Evaporative Emission Control System
I-6EM13i(4) Apply a vacuum and check for airtightness when voltage
applied directly to the purge control solenoid valve and
when the voltage is discontinued.
Battery voltageResultNon-Turbo When applied
Vacuum leaks
When discontinuedVacuum is maintained
TurboWhen applied
When discontinued
Vacuum is maintained
Vacuum leaks
(5) Measure the resistance between the terminals of the
solenoid valve.
Standard value: 36
- 44 R [at 20°C (68”F)]
AIR FLOW SENSOR, ENGINE COOLANT TEMPER-ATURE SENSOR AND INTAKE AIR TEMPERA-
TURE SENSORM17lBGFTo inspect these parts, refer to GROUP 13
- MPI System
Components.
AIR CONDITIONER SWITCHMl7IBHF
To inspect the air conditioner switch, refer to GROUP 55
- Air
Conditioner Switch.
OVERFILL LIMITER (TWO-WAY VALVE)M17IBEFTo inspect the overfill limiter (two-way valve), refer to GROUP
13
- Fuel Tank.
CANISTERM17lBIFTo inspect the canister, refer to GROUP 13
- Fuel Line and
Vapor Line.
FUEL FILLER CAP INSPECTIONM17IBJBCheck the gasket of the fuel filler cap, and the filler cap itself,
for damage or deformation; replace the cap if necessary.
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EMISSION CONTROL -Exhaust Gas Recirculation (EGR) System17-11
EXHAUST GAS RECIRCULATION (EGR) SYSTEMrm?MA- -COMPONENTS LOCATION
L
,
i
-
\\
(%vTT
I
4/ -I---Id/- -3Th
--02
I
1-a\\
IJ-l f--An7FUlOl
NameSymbol
<California - Non Turbo, Turbo>~ EGR control solenoidvalve1 :
EGR temperature sensor <Cahfornla>~
EGR valve <California - Non Turbo, Turbo>
7EM014f
1TSB Revision

17-12EMISSION CONTROL - Exhaust Gas Recirculation (EGR) System
Engine speed (rpm)1 FU44lEGR SYSTEM INSPECTION <California
- No,
Turbo, Turbo>M171WQ
(1) Disconnect the vacuum hose (green stripe) from the EGR
valve, and connect a 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
(158°F) or more] of the engine, check the following two
points:
<Cold condition of engine>
~1<Warm condition of engine>
Engine operationINormal state
Race the engine by
rapidly press in the
accelerator pedal.The negative pressure risesto 100 mmHg (3.9 in.Hg) ormore.(3) Disconnect the three-way terminal, and connect the hand
vacuum pump to the EGR valve.
(4) When a negative pressure of 230 mmHg (9.1
in.Hg.1 is
applied during idling, check that the engine stops or idles
unstably.
EGR VALVE CONTROL VACUUM CHECK
<California - Non Turbo, Turbo>Ml7ICMF
Check ConditionEngine coolant temperature: 80
- 95°C (176 - 205°F)
(1) Disconnect the vacuum hose from the throttle body EGR
vacuum nipple and connect a hand vacuum pump to the
nipple.
(2) Start the engine and check to see that, after raising the
engine speed
.by racing the engine, vacuum raises pro-
portionately with the rise in engine speed.
NOTEIf there is a problem with the change in vacuum, it is
possible that the throttle body port may be clogged and
require cleaning.

EMISSION CONTROL - Exhaust Gas Recirculation IEGR) Svstem17-13
GM159
QQQQQQ7FMnn4EGR VALVE <California
- Non Turbo, Turbo>
M17lCKJ
INSPECTION(1) Remove the EGR valve and check it for sticking, deposit of
carbon, etc.
If such condition exists, clean with adequate solvent to
ensure tight valve seat contact.
(2) Connect a hand vacuum pump to the EGR valve.
(3) Apply a vacuum of 500 mmHg (19.8 in.Hg.) and check
airtightness.
(4) Blow in air from one passage of the EGR to check condition
as follows.
INSTALLATIONInstall a new gasket and EGR valve, tighten bolts to specified
torque.
Specified tightening torque: 19
.Nm (13 ft.lbs.)
EGR TEMPERATURE SENSOR <California>M17lCYC
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 significant
deviation from the standard value.
INSTALLATIONInstall the EGR temperature sensor tighten to specified torque.
Specified tightening torque: 11 Nm (8
ftlbs.)
EGR CONTROL SOLENOID VALVE <California -
Non Turbo, Turbo>MlllCRE
INSPECTION
NOTEWhen disconnecting the vacuum hose, make an identification
mark on it so that it can be reconnected to the original position.
(1) Disconnect the vacuum hose (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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17-14 EMISSION CONTROL -Exhaust Gas Recirculation (EGR) System / Catalytic Converter
6EM01871
6EM0181(4) Apply a vacuum and check for air-tightness when voltage
applied directly to the EGR control solenoid valve and when
the voltage is discontinued.
Battery voltageResult
When applied
When discontinued
Vacuum is maintained
Vacuum leaks
(5) Measure the resistance between the terminals of the
solenoid valve.
Standard value: 36
- 44 R [at 20°C (68”F)]
AIR-FUEL RATIO CONTROL (MPI) SYSTEMM17ICAJ
lTo inspect the air-fuel ratio control (MPI) system, refer to
GROUP1 3 - Service Adjustment Procedures.
lFor detailed information concerning the illumination pattern
of the malfunction-indicator light and other aspects of the
self-diagnosis function, refer to GROUP 13 -Self-diagnosis.
\.J
CATALYTIC CONVERTERMl7N& -
REMOVAL AND INSTALLATIONRefer to GROUP 15
- Exhaust Pipe, Main Muffler and Catalytic
Converter.
INSPECTIONMl7NCAA
Inspect for damage, cracking or deterioration. Replace if faulty.
Caution1. Operation of any type, including idling, should be
avoided if engine misfiring occurs. Under this conditionthe exhaust system will operate at abnormally high
temperature, which may cause damage to the catalystor underbody parts of the vehicle.
2.Alteration or deterioration of ignition or fuel system, or
any type of operating condition which results in enginemisfiring must be corrected to avoid overheating the
catalytic converters.
3.Proper maintenance and tune up according to manufac-turer’s specifications should be made to correct the
‘bi
conditions as soon as possible.TSB Revision

CLUTCH
CONTENTS
CLUTCH CONTROL. . .._.........._........................_...
CLUTCH COVER AND DISC ,...............................
CLUTCHMASTERCYLINDER. . . . . . . . . . . . . . . . . . . . . . . . . . . .
CLUTCHPEDAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CLUTCH RELEASE CYLINDER. . . . . . . . . . . . . . . . . . . . . . . .CLUTCH VACUUM LINE,
:
L/
VACUUM TANK <AWD>. . . . . . . . . . . . . . . . . . .._...........
SERVICE ADJUSTMENT PROCEDURES. . . . . . . .Bleeding
. . . . .._................................_................_...Check Valve Operation Check
<AWD>. . .._...Clutch Booster Operating Inspection
<AWD>. . . .._....._................................................Clutch Pedal Inspection and Adjustment
..____..
17
5
7
6
6
5
10
19
14
8
15
SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .General Specifications
. . . . . . . . . . . . . . .._..._...............Lubricants
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Sealant
_..............._...............................................Service Specifications
. . . . . . . . . . . . . . . . . . . . . . . .._........_.
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Clutch Slips
Clutch Vibrates
Gear Shifting Failure
Heavy Clutch Pedal
Noisy Clutch
2i
2
3
3
2
3

CLUTCH - Specifications
SPECIFICATIONSI
GENERAL SPECIFICATIONSMZlCA--i
Type
Facing diameterSingle dry disc type
Single dry disc type
Diaphragmspring strap
SERVICE SPECIFICATIONS
terns
Standard value
Clutch pedal heightmm (in.)
Clutch pedal strokemm (in.)
Amount of clutch pedal return from full pedal stroke
position to where operating sound of interlock switch
is producedmm (in.)
Clutch pedal
clevis pin playmm (in.)
Clutch pedaLfree playmm (in.)
Distance between the clutch pedal and the firewall when
the clutch is disengagedmm (in.)
Specifications
177 - 182 (6.97 - 7.17)
160 (6.29)
IO-15(.394-,591)
I-3 (.04-.12)
6-13(.24-.51)
55 (2.2) or more
Booster push rod to master cylinder piston clearance
0.21 - 0.46 (.0082 - .0181)mm (in.) <AWD>
Vacuum hose insertion distancemm (in.) <AWD>20 - 25 (0.8 - 1 .O)
Limit
Facing rivet sinkmm (in.)0.3 l.012)
Diaphragm spring end height differencemm (in.)0.5 (.020)
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