1991 MITSUBISHI 3000GT service

INTAKE AND EXHAUST - Active Exhaust System
ACTIVE EXHAUST SYSTEM
REMOVAL AND INSTALLATION
15-33
M15WA- -7Nm
5 ft.lbs.
Removal steps
I. Active exhaust system control unitI)+2. Connection of cable (Actuator side)3. Actuator
4. Protector
l +5. Connection of cable (Muffler side)
6. CablePre-removal and Post-installation
l Removal and Installation of Rear Side Trim (LH)(Refer to GROUP 52A-Trims.)
/DSFDO21
Adjusting nuts
05FOO2
SERVICE POINTS OF INSTALLATIONMISWDAA
5. INSTALLATION OF CABLE (Muffler Side)
Install with the paint mark facing up and adjust the adjusting
nut to obtain the illustrated dimension.
2. INSTALLATION OF CABLE (Actuator Side)
After adjusting the cable on the muffler side, adjust the
adjusting nuts for an inner cable play of 0 to 1 mm
(0 to .04
in.).
TSB Revision

17-1
EMISSIONCONTROL
.~
CATALYTIC CONVERTER............................:...Inspection
............................................................Removal and Installation
................................
CONTENTSM17.U. -
CRANKCASE EMISSION CONTROL
SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ComponentsLocation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Crankcase Ventilation System Inspection
._..Positive Crankcase Ventilation Valve
. . . . . . . . . . . .
EVAPORATIVE EMISSION CONTROL
SYSTEM................................................................Air Conditioner Switch
....................................Air Flow Sensor, Engine Coolant
Temperature Sensor and Intake Air
Temperature Sensor
........................................Canister
............................................................Components Location
....................................
FuelFiller CapInspection................................OverfillLimiter (Two-way Valve)
....................Purge Control Solenoid Valve
........................Purge Control System Inspection
....................................................Purge Control System Inspection

............................................................Purge Control Valve
........................
PurgePort VacuumCheck................................14
14
14
6
10
10
10
6
10
10
9
7
8
9
9EXHAUST GAS RECIRCULATION
(EGR)
SYSTEM. . . . . ..____._.._........__........_____.........................Air-FuelRatio Control (MPI) System. . . . . . . .
Components Location
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .EGR Control Solenoid Valve
- Non Turbo, Turbo>. . . . . . . . . . . . . . . . . . . .EGR System Inspection
- Non Turbo, Turbo>. . . . . . . . . . . . . . . . . . . .EGR Temperature Sensor
. . . . . . . .EGR Valve - Non Turbo, Turbo>
EGR Valve Control Vacuum Check
- Non Turbo, Turbo>. . . . . . . . . . . . . . . . . . . .
SPECIFICATIONS................................................General Specifications
....................................Service Specifications
....................................
TROUBLESHOOTING. . . . . . . . . . . . . . . . . ..______...............
VACUUM HOSES................................................Inspection
............................................................Installation
........................................................VacuumHosesRouting
....................................
11
14
11
13
12
13
13
12
2
2
22

17-2EMISSION CONTROL - Specifications / Troubleshooting
SPECIFICATIONS
GENERAL SPECIFICATIONSMl’ICA- -\
Items
Crankcase emission control systemSpecifications
Closed type with positive crankcase ventilationvalve
Evaporative emission control systemCanister storage type
Canister
Charcoal type
Purge control solenoid valve
ON/OFF solenoid valve
Exhaust emission control system
Exhaust gas recirculation system
EGR valveVacuum-activated diaphragm type
EGR temperature sensor Thermistor type
EGR control solenoid valve - Non Turbo, Turbo>Duty cycle solenoid valve
Catalytic converter
Monolith type
Location
Under floor
Turbocharger outlet (front bank and rear bank,)
and under floor
SERVICE SPECIFICATIONSMl7CB-.
ItemsSpecifications
Purge control solenoid valve coil resistance
036 - 44 [at 20°C (68”F)I\
EGR temperature sensor resistancekfl60 - 83 [at 50°C (I 22”F)]
11 - 14 [at 100°C (212”F)l
EGR control solenoid valve coil resistance1236 - 44 [at 20°C (68”F)lI
TROUBLESHOOTING
Symptom
Engine will not start
or hard to start
Rough idle or engine
stalls
Probable cause
Vacuum hose disconnected or damaged
The EGR valve is not closed
Malfunction of the purge control solenoid valve
The EGR valve is not closed
Vacuum hose disconnected or damaged
Malfunction of the positive crankcase ventilationvalveRemedy
Repair or replace
Repair or replace
Repair or replace
Repair or replace
Repair or replace
Replace
Malfunction of the purge control systemCheck the system; if there is a
problem, check its component parts
Engine hesitates or3oor acceleration
Zxcessive oil:onsumptron
Malfunction of the exhaust gas recirculation
system
Positive crankcase ventilation line cloggedCheck the system; if there is a
problem, check its component parts
Check positive crankcase
ventila-tion system
Ioor fuel mileageMalfunction of the exhaust gas recirculation
systemTSB RevisionCheck the system; if there is a
problem, check its component parts
d

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 . . . . . . . . . . . . . . . . . . .._...........
SERVICE ADJUSTMENT PROCEDURES. . . . . . . .Bleeding
. . . . .._................................_................_...Check Valve Operation Check
. . .._...Clutch Booster Operating Inspection
. . . .._....._................................................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.)
Vacuum hose insertion distancemm (in.) 20 - 25 (0.8 - 1 .O)
Limit
Facing rivet sinkmm (in.)0.3 l.012)
Diaphragm spring end height differencemm (in.)0.5 (.020)
1 TSB RevisionI

CLUTCH - Service Adjustment Procedures21-5
Clutch pedal height
08YO41
auto-cruise control
L-l
\ \ 0Cl;tchswitch
\ \08F0010
Clutch pedal stroke
Lock nut
08F005414110052
SERVICE ADJUSTMENT PROCEDURES
CLUTCH PEDAL INSPECTION AND ADJUSTMENTMZlFAAP
1.Measure the clutch pedal height (from the face of the pedal
pad to the firewall).
Standard value: 177
- 182 mm (6.97 - 7.17 in.)
If the clutch pedal height is not within the standard value
range, adjust as follows:
For vehicles without auto-cruise control system, turn and
adjust the bolt so that the pedal height is the standard
value, and then secure by tightening the lock nut to the
specified torque.
Vehicles with auto-cruise control system, disconnect the
clutch switch connector and turn the switch for standard
clutch pedal height. Tighten the lock nut to the specified
torque.
Specified torque: 13 Nm (9
ft.lbs.)
NOTEWhen the pedal height is lower than the standard value,
loosen the bolt or clutch switch, and then turn the push rod
to make the adjustment. After making the adjustment,
tighten the bolt or clutch switch to reach the pedal stopper,
and then lock with the lock nut.
2. Measure the clutch pedal stroke.
Standard value: 160 mm (6.29 in.) or more
If the clutch pedal stroke deviates from the standard value,
turn the push rod to adjust the stroke.
3. Return the clutch pedal gradually from its full-stroke
position to measure amount of the return made by the
pedal
u,ntil the interlock switch makes an operating sound.
Standard value: 10
- 15 mm (.394 - .591 in.)
If the amount of pedal return deviates from the standard
value, adjust it by loosening the lock nut and turning the
interlock switch.
TSB Revision

21-6CLUTCH - Service Adjustment Procedures
08YO4Z
Distance between the clutch pedaland the firewall when the clutchis disengaged
08NOOl C
Good
c1‘14UOO61
When engine is
stoppedNo good
\)‘14UOO6:
When engine isstarted
14UOO604. Measure pedal play. In the case of AWD vehicles, depress~
the pedal 2 or 3 times to eliminate booster negative
pressure with the engine stopped and then push the pedal
with a finger to measure the play.
LJClutch pedal play (including play of clevis pin)
Standard value: 6
- 13 mm (.24 - 51 in.)
2
CHECK VALVE OPERATION CHECK I
MZlFOAAWhen checking the check valve, keep the check valve fit in the
vacuum hose.
1. Remove the vacuum hose.
CautionL’The check valve is press-fit inside the vacuum hose and
do not remove the check valve from the vacuum hose.
5.Measure the clearance to the toe board (or pedal stopper)
when the clutch disengages. In the case of AWD vehicles,
measure with the engine running.
Clearance to toe board when clutch disengages:
Standard value: 55 mm (2.2 in.) or more
6.If the play and/or clearance is out of specification, bleed the
hydraulic system or check the master cylinder, release
cylinder or clutch proper.
CLUTCH BOOSTER OPERATING INSPECTION
MZlFCAAFor simple checking of clutch booster operation, carry out the
following tests.
(I) Run the engine for one or two minutes, and then stop it.
(2) Step on the clutch pedal several times. with normal
pressure.
If the pedal depressed fully the first time but gradually
becomes higher when depressed succeeding times the
dbooster is operating properly.
If the pedal height remains unchanged, the booster is
faulty.
(3) With the engine stopped, step on the clutch pedal several
times with the same foot pressure to make sure that the
pedal height will not change.
Then step on the clutch pedal and start the engine.
If the pedal moves downward slightly, the booster is in
good condition. If there is no change, the booster is faulty.
(4) With the engine running, step on the clutch pedal and then
stop the engine.
Hold the pedal depressed for 30 seconds. If the pedal
height does not change, the booster is in good condition.
If the pedal rises, the booster is faulty.
If the above three tests are okay, the booster performance can
be determined as good.
If one of the above three tests is not okay at last, the check
valve, vacuum hose, or booster will be faulty.
TSB Revision