1991 MITSUBISHI 3000GT check engine

17-12EMISSION CONTROL - Exhaust Gas Recirculation (EGR) System
Engine speed (rpm)1 FU44lEGR SYSTEM INSPECTION - 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:

~1
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
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.

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

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.
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MANUAL TRANSAXLE - Transaxle Assembly22-15
idPost-installation Operationl Installation of Front Under Cover(Referto GROUP 51 -Front Bumper.)l Supplying of Transmission Oil (Refer to P.22-9.)l Filling of Engine Coolant (Refer to GROUP 14-
Service Adjustment Procedures.)70 Nm
l Checking Operation of Shift Lever at Each Positionl Checking the Operation of the Meters and Gauges26
ft.lbs.09FOO84
4*9. Connection for transaxle mount16. Starter10. Transaxle mount bracket4*17. Drive shaft (Left side),
l * 11. Mounting stopperinner shaft assembly12. Transaxle assembly upper part+* ** 18. Drive shaft (Right side)
coupling bolt19. Transaxle stay (Front bank side)4*13. Connection for tie rod end20. Transaxle stay (Rear bank side)4*14. Connection for lower arm4*21. Transaxle assembly lower part
ball jointcoupling bolt15. Right member4*22. Transaxle assembly
SERVICE POINTS OF REMOVALMZZMBBA6. DISCONNECTION OF THE CLUTCH TUBE BRACKET
AND CLUTCH DAMPER ASSEMBLY
Remove the clutch release cylinder and clutch oil line
bracket installation bolt, and then secure at the body side
without disconnecting the oil line coupling.
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AUTOMATIC TRANSAXLE - Troubleshootincl23-19Based upon use of the troubleshooting
Checks should be made of fluid levels and
the condition of the ATF, as well as the
condition of the manual control cables;
adjustments should then be made if found
to be necessary.
If a presumption has been made that there
is an abnormal condition somewhere in
the electronic-control system, check the
fault code, in order to determine the
probable location of the problem, by using
a multi-use tester or voltmeter.
I
When the abnormal system is discovered,
check each element (sensors, etc.) one by
one, and make repairs as necessary.
IWhen the abnormal condition is presumed
to be in the oil-pressure-control system
When the result of the oil-pressure test
does not satisfy the specified pressure,
check each system at places related to the
valve body, check the oil-pressure pas-
sages for leakage, etc.
I
If the problem isunusually dirty ATF,
abnormal noises, oil leakage, or slippage of
the clutch or brakes, or an abnormal
condition of the transaxle itself, disassem-
ble and repair the transaxle.
TROUBLESHOOTINGM23EEAYFunctional malfunctions of the ELC4A/T can lead to other
problems, such as those described below:(I
) Improper maintenance and/or adjustments
(2) Malfunctions of the electronic control functions
(3) Malfunctions of mechanical functions
(4) Malfunctions of hydraulic control functions
(5) Malfunctions of engine performance
etc.
In order to properly determine (“Troubleshoot”) the source of
these malfunctions, it is first essential to methodically question
the user concerning the details of the problem, such as the
condition of the problem, the situation at the time the problem
occurred, and any other relevant information, all in as much
detail as possible. The user should also be asked whether or
not the problem has occurred more than once, and under what
conditions.
Subsequently, certain tests should be conducted in a certain
order, as described at the left.
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23-28AUTOMATIC TRANSAXLE - Troubleshooting
INSPECTION OF CONTROL SYSTEMCheck the control system by using the multi-use tester and following the procedure given below.
CONTROL SYSTEM INSPECTION TABLE
Check Item
sensor
l Data listl Item No. 15Cold engine (before start)nglne warming up
l Data listl Item No. 23
or circuitharness
Item No. 26
lerator pedal switchl
Item No. 27l Defective inhibitor switch circuitl Defective TPS circuitl
Defective pulse generator A
shielded wire
l External noise interference
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23-32AUTOMATIC TRANSAXLE - Troubleshooting
INSPECTION OF ELECTRONIC CONTROL SYSTEM COMPONENTS
1. WiringBased on the wiring diagram.check whether the continuity andgrounding of each harness is OK.
I
(
4
ContinuityII
+
Normal~ Improper connection of
connector, damaged ordisconnected harness,
or incorrect wiring con-
nection.
I
Reconnect the connec-tor; repair or replace theharness.Vary the thermo-sensitive part
2. Oil-temperaturefrom low temperature to highsensortemperature and check theresist-Damaged or disconnected
ante between the terminals 1 anwiring2or2and3.
4
J
Changes of the resistance con-Replace the oil-
tinuous and smooth.temperature sensor
41750447
Normal1
1:LOW temperature side2: Ground
3:High temperature side
I:3. Throttle-
K
Check the resistance between
Ip~~~t,ion sensorterminals 1 and 4 of the TPS.hiah or infinitem- -----inecteciI-
\ IDamaged or discon-..----Awiring
I
c3.5 - 6.5 kW20”C (68°F)t
v
Replace the TPS.I>ITPS terminal
7FUO5351. Ground
2. Idle switch
3. output
4. Power
Check the resistance betweenterminals 4 and 2 with the engine
idling after throttle-valve opening
warm-up.
Resistance: approx. 0.4
kR/20°C (68°F)
Changes of the resistance con-
tinuous and smooth.
/Resistance:\more or less
than 0.4 kQ/Improper adjustment
Istallaiion.I
Check for changes of theresist-ance between terminals 4 and 2when the throttle valve is
operated from the idling position
o the fully open position.
Poor contactII
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AUTOMATIC TRANSAXLE - Troubleshooting23-33
4. Pulse generatorCheck the resistance betweenAorBterminals1and 2or3and4.agedordisconnected
iv1-Pulse generator terminalsl-2: pulse
generator A3-4 pulse
generator B
17503381I\Connect the pulse generator and
front wheels raised.
Oscilloscope waveform
With the selector lever at the “L”
position and the engine running at
1,000 rpm, check the voltagewaveform between terminals1(
1 .OOO mVp-p or higher
Noise>
iJh
171092
f\/ With the selector lever at the “L”\
position and the engine running at1,000 rpm. check the voltagewaveform between terminals 3and 4.
I
1fWWF;tf: pulse /
Correct the inst.allationcondition, or replace the
pulse generator.
L-
*
500 mVp-p or higherI
Noise
ICorrect the installationcondition. or redace theI1 pulse generator,.1
171092
*
Normal1
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