MITSUBISHI 3000GT 1991 Service Manual

INTAKE AND EXHAUST -Exhaust Pipe, Main Muffler and Catalytic Converter <Turbo>15-31
- EXHAUST PIPE, MAIN MUFFLER AND CATALYTIC CONVERTER
<Turbo>MlSRA-S
ii REMOVAL AND INSTALLATION31
/
L
LRemoval steps
36ft.lbs.
22013 Nm9 ft.lbs.----
em
/---------6_ 5ftJbs.13 Nm
9 ft.lbs.
1. Main muffler and center
exhaust pipe installation
bolts
2. Protector
l +3. Connection of cable assemblya*4. Rubber hangersa*5. Rubber hangersl *6. Main muffler
7. Gasket8. Mouldings
9. Hanger brackets10. Catalytic converter and center
exhaust pipe installation nuts
11. Hanger bracket
12. Rubber hangers13 Nm
9
ft.lbs.
13. Center exhaust pipe14.Gasket15.Rubber hangers
16.Hanger brackets17.Hanger bracket
18. Rear floor heat
protector
19. Catalytic converter and front
exhaust pipe installation bolts
20.Catalytic converter21.Gasket22.Self-locking nuts23.Rubber hanger
24. Front exhaust pipem
-.Ibs.
25.Gaskets
26.Self-locking nuts
27. Catalytic converter (Right)28.Gasket
29.Hanger bracket
+*l 4130.Oxygen sensor connection31. Heat protector D
32. EGR pipe connection
33.Gasket34. Catalytic converter (Left)
35. Heat protector E
36. Gasket
37. Front floor heat protectorTSB Revision

15-32 INTAKE AND EXHAUST -Exhaust Pipe, Main Muffler and Catalytic Converter <Turbo>
SERVICE POINTS OF REMOVALMlBRBAA
4. 5. REMOVAL OF RUBBER HANGER / 6. MAIN MUFFLERSupport with a transmission jack, etc.
:iJ ~
30. REMOVAL OF OXYGEN SENSORDisconnect the connector of the oxygen sensor, and install
the special tool to the oxygen sensor.
INSPECTIONMlSRCAN
l Check the mufflers and pipes for corrosion or damage.
l Check the rubber hangers for deterioration or damage.
l Check for gas leakage from mufflers and pipes.
lCheck if the main muffler active exhaust system valve can\\be moved smoothly by hand.
SERVICE POINTS OF-INSTALLATIONMllRDAl
30. INSTALLATION OF OXYGEN SENSORUse the special tool to install the oxygen sensor.
3. INSTALLATION OF CABLE ASSEMBLY
Install with the paint mark facing up and adjust the adjusting
nut to obtain the illustrated dimension.
TSB Revision

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

INTAKE AND EXHAUST - Active Exhaust SystemINSPECTION
ACTIVE EXHAUST SWITCH
MllWCAA
(1) Remove switch garnish B from the knee protector.
05FOO5(2) Operate the switch and check the continuity between the
terminals.NOTEO-O indicates that there is continuity between the terminals.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
<NonTurbo>....................................................Purge Control System Inspection
<Turbo>
............................................................Purge Control Valve <Turbo>
........................
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
<California
- Non Turbo, Turbo>. . . . . . . . . . . . . . . . . . . .EGR System Inspection
<California
- Non Turbo, Turbo>. . . . . . . . . . . . . . . . . . . .EGR Temperature Sensor <California>
. . . . . . . .EGR Valve <California
- Non Turbo, Turbo>
EGR Valve Control Vacuum Check
<California
- 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 <California>Thermistor type
EGR control solenoid valve <California
- Non Turbo, Turbo>Duty cycle solenoid valve
Catalytic converter
Monolith type
Location <Non-Turbo>
Under floor<Turbo>
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

EMISSION CONTROL - Vacuum Hoses
VACUUM 1-10sEs
lVACUUM HOSES ROUTING
L// <Federal - Non Turbo>
17-3M17JA-
-
I’
Li
Fuel pressureregulator
Vehicle front
id<California - Non Turbo>
L: Light blueR: RedB: Black
7EM0131
EGR controlsolenoid valve
r-c,cud valve/
Canister
/Fuel pressureregulator
v
Vehicle frontG: GreenY: Yellow
L: Light blueR: RedB: Black
TSB Revision
7EM0132I
1

17-4EMISSION CONTROL - Vacuum Hoses<Turbo>
Fuel pressure control
solenoid valveEGR controlWaste gate control
solenoid valve
solenoid valve
/\,i
aste gate actuator
G: GreenY: Yellow
L: Light blueR: RedB: BlackW:White
Purge controlsolenoid valve
Bypass valve
/Fuel pressure regulator
Purge control valve
Waste gate actuator
TLrbocharger7EM0133
INSPECTIONM17JCAF +’
(1) Referring to the VACUUM HOSES ROUTING, confirm that
the vacuum hoses are properly connected.
(2) Check the hoses for irregularities (disconnection, loose-
ness, etc.) and confirm that there is no breakage or
damage.
INSTALLATIONM17JDAF(1) When connecting a hose, firmly press it onto the nipple.
(2) Referring to the VACUUM HOSES ROUTING, connect the
hoses correctly.
TSB Revision

EMISSION CONTROL - Crankcase Emission Control System17-5
CRANKCASE EMISSION CONTROL SYSTEM
COMPONENTS LOCATIONJ
Ir--‘-l7FU1002
Name
Positive crankcase ventilation valveSymbolA
i{
ventilation valve\”
------rLYJ7EM0134M17KA--
CRANKCASE VENTILATION SYSTEM INSPEC-
TIONM171ABG(1) After disconnecting the ventilation hose from the positive
crankcase ventilation valve, disconnect the positive crank-
case ventilation valve from the rocker cover, and reconnect
the positive crankcase ventilation valve to the ventilation
hose.
(2) Idle engine, put finger on the opening end of the positive
crankcase ventilation valve, and check that the negative
pressure of the intake manifold is felt with finger.
NOTEAt this time, the plunger in the positive crankcase ventila-
tion valve moves back and forth.
(3) If negative pressure is not felt, clean or replace the positive
crankcase ventilation valve.
POSITIVE CRANKCASE VENTILATION VALVEMl7lACC
INSPECTION
(1) Remove the positive crankcase ventilation valve.
(2) Insert a thin stick into the positive crankcase ventilation
valve from the threaded side to check that the plunger
moves.
(3) If the plunger does not move, the positive crankcase
ventilation valve is clogged. Clean it or replace.
INSTALLATIONInstall the positive crankcase ventilation valve and tighten to
specified torque.
Specified tightening torque:
10 Nm (7.2 ft.lbs.1TSB Revision

17-6EMISSION CONTROL - Evaporative Emission Control System
EVAPORATIVE EMISSION CONTROL SYSTEM
COMPONENTS LOCATION
-\-\
TUW-\pJJ
7FIIl
NameSymbol
Canister
Purge control solenoid valveB
A
1 Purge control valve <Turbo>I c I
M17LA- -
ITSB RevisionI
Ldi ’
LI