1994 MITSUBISHI 3000GT malfunction

Downloaded from www.Manualslib.com manuals search engine CIRCUIT DIAGRAMS - MFI Circuit
COMPONENT LOCATIONUp to 1993 models and 1994, 1995 models Non Turbo (Federal)
NameSymbol
Air conditioning relay0
Air conditioning switch
Camshaft position sensor
a
Check engine/malfunction indicator lampP
Crankshaft position sensorD
Data link connectorR
EGR solenoid Z
EGR temperature sensor

Engine control module
Engine coolant temperature sensor
Evaporative emission purge solenoid
Fuel pressure solenoid

Heated oxygen sensorE
idle air control motor (stepper motor)L
Name/ Symbol
Ignition coil (ignition power transistor)
Ignition timing adjusting terminal
Injector
(1
Multrport fuel rnjectron (MFI) relay
ParWNeutral position switch c&T>
Power steering pressure switchH
Resistor W
Throttle position sensor (With built-in closed throttleCposition switch)
Turbocharger waste gate solenoid U
Variable induction control motor (DC motor) (withJbuilt-in induction control valve position sensor)

Vehicle speed sensorFIVolume air flow sensor (with built-in intake air A
temperature sensor and barometric pressure sensor)
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Downloaded from www.Manualslib.com manuals search engine CIRCUIT DIAGRAMS - MFI Circuit167 ~
Check engine/malfunction
Lki @ %\\ Y7FUO999 1
\l-T-T-. .
Engine control
moduleW
16FO297
Xl 6FO498
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Downloaded from www.Manualslib.com manuals search engine CIRCUIT DIAGRAMS - MFI Circuit
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L
c
Injector
-I\/-, Y7FUO803
\ R\/1/I‘ relay- 1
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1Check engine/malfunction
U68FOOll
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Downloaded from www.Manualslib.com manuals search engine ENGINE ELECTRICAL - Charging System16-7/
L
(6) Connect a tachometer. (For the procedure for
connecting the tachometer, refer to GROUP
- On-vehicle Service.)(7)
kkconnect the negative battery cable.
(8) Leave the hood open.
(9) Start the engine.
(lO)With the engine running at 2500 rpm, turn the
headlights and other lights on and off to adjust
the generator load so that the value displayed
on the ammeter is slightly above 30A.Limit value: Max. 0.3 V
NOTE
When the generator output is high and the value
displayed on the ammeter does not decreaseto
30A, set the value to 40A. Read the value
displayed on the voltmeter at this time.
In this case the limit value becomes max. 0.4V.
Adjust the engine speed by gradually decreas-
ing it until the value displayed on the ammeterOUTPUT CURRENT TEST
is 30A. Take a reading of the value displayed
on the voltmeter at this time.
(11) If the value displayed on the voltmeter is above
the limit value, there is probably a malfunction
in the generator output wire, so check the wiring
between the generator
“IS” terminal and the bat-tery
(+) terminal (including fusible link).
If a terminal is not sufficiently tight or if the har-
ness has become discolored due to overheating,
repair and then test again.(12)After the test, run the engine at idle.
(13)Turn off all lights and turn the ignition switch
to the OFF position.
(14)Disconnect the negative battery cable.
(15)Disconnect the ammeter, voltmeter and tachom-
eter.
(16)Connect the generator output wire to the genera-
tor “B” terminal.
(17)Connect the negative battery cable.
Charging indicatorGenerator
30A
Voltmeter
BatteryAmmeter
t
-Load
6EN0893
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Downloaded from www.Manualslib.com manuals search engine ENGINE ELECTRICAL - Charging Svstem16-9REGULATED VOLTAGE TEST
\:
b
Ignitionswitch (IGl)Generator
This test determines whether the voltage regulator
is correctly controlling the generator output voltage.
(1) Always be sure to check the following before
the test.l Generator installation
lCheck to be sure that the battery installedin the vehicle is fully charged. (Refer to
GROUP 54 - Battery.)l Generator drive belt tension (Refer to
GROUP 00 - Maintenance Service.)l Fusible link
l Abnormal noise from the generator while
the engine is running(2) Turn the ignition switch to the OFF position.
(3) Disconnect the negative battery cable.
(4) Connect a digital-type voltmeter between the
generator “S” terminal and the ground. (Connect
the
(+) lead of the voltmeter to the “s” terminal,
and then connect the (-) lead of the voltmeter
to a secure ground or to the battery (-) terminal.)
(5) Disconnect the generator output wire from the
generator
“B” terminal.(6) Connect a DC test ammeter with a range of
O-100A in series between the “B” terminal andthe disconnected output wire. (Connect the
(+) lead of the ammeter to the “B” terminal,
and then connect the (-) lead of the ammeter
to the disconnected output wire.)
(7) Connect a tachometer. (Refer to GROUP 11
- On-vehicle Service.)
(8) Reconnect the negative battery cable.
VOLTAGE REGULATION TABLE
Ammeter
- Load
6EN1029
(9) Turn the ignition switch to the ON position and
check that the reading on the voltmeter is equal
to the battery voltage.
NOTE
If the voltage is 0 V, the cause is probably an
open circuit in the wire or fusible link between
the generator
“S” terminal and the battery (+)
terminal.
(1O)Check to be sure that all lights and accessories
are off.
(11) Start the engine.(12)lncrease the engine speed to 2,500
r/min.
(13)Read the value displayed on the voltmeter when
the current output by the generator becomes
10A or less.
(14)lf the voltage reading conforms to the value
in the voltage regulation table, then the voltage
regulator is operating normally.If the voltage is outside the standard value,
there is a malfunction of the voltage regulator
or of the generator.
(15)After the test, lower the engine speed to the
idle speed.
(16)Turn the ignition switch to the “OFF” position.
(17)Disconnect the negative battery cable.
(18)Disconnect the ammeter, voltmeter and
tachometer.(19)Connect the generator output wire to the
generator “B” terminal.
(20)Connect the negative battery cable.
Inspection
terminal
Terminal “S”
Voltage regula-Standard value Inspection
torambient (V)terminal
temperature
(“C PI)-20 (-4)14.2-15.4
Terminal “S”
20 (68)13.9-14.9
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Voltage regula- Standard value
torambient (V)
temperature(“c
PI)
60 (140)13.4-14.5
80 (176)13.1-14.5
I

Downloaded from www.Manualslib.com manuals search engine CHASSIS ELECTRICAL - Radio and Tape Player54-175c-4
Sound quality is poor, or sound is weak.
Yes
,/lEnsure that the tape label is not loose, that the tape itself is not
deformed and that the tape is tightly wound.
l
Tapes of C-i 20 or greater length often get caught in the mechanismand should not be used.
Yes
No
ccl
tIs proper operation obtained when thecaYes/No
1 Repair or replace speaker.1c-5
Cassette tape will not be ejected.
The problems covered here are all the result of the use of a bad tape (deformed or not properly tightened)
or of a malfunction of the cassette player itself. Malfunctions involving the tape becoming caught in themechanism and ruining the case are also possible, and attempting to force the tape out of the player
can cause damage to the mechanism. The player should be taken to a service dealer for repair.
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Downloaded from www.Manualslib.com manuals search engine iCHASSIS ELECTRICAL
- Theft-alarm Svstem54-221
(Output)Voltmeter rvv 1-1
Scan tool(Buzzer %,isound)16FO5712. Make sure that when the following switches are turned
on, the output shown in the illustration is delivered. (Only
those switches which are related to the theft-alarm system
are listed here.)
0Driver and front passenger door switchesl Headlight switch
lDriver and front passenger door lock switchesl Passing light switch
l Pop-up switch (up to 1993 models)
l Hood switch
l
Liftgate switch
l Door key cylinder switch
l
Liftgate switch
If there is no output of a voltage pattern at all, check
for a malfunction of that switch or for damaged or discon-
nected wiring.
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Downloaded from www.Manualslib.com manuals search engine 54-222CHASSIS ELECTRICAL - Theft-alarm System
TROUBLESHOOTING QUICK-REFERENCE TABLE
For information concerning the locations of electrical components, refer to GENERAL-Theft-alarm System
Circuit.
1.ARMING / DISARMING RELATIONSHIP
Trouble symptomThe system is not armed (The
SECURITY light doesn’t illumi-
nate, and the alarm doesn’t func-
tion.)
(The central door locking system
functions normally.
If the central locking system doesnot function normally, refer to
GROUP 42.)
The arming procedures are fol-
lowed, but the SECURITY light
does not illuminate.(There is an alarm, however,
when an alarm test is conductedafter about 20 seconds have
passed.)
The alarm sounds in error when,
while the system is armed, a door
or the liftgate is unlocked by us-
ing the key.
ICause
Damaged or disconnected
wiring of ECU power sup-
ply circuit
Damaged or disconnected
wiring of door switch input
circuit
Damaged or disconnectedwiring of SECURITY light
activation circuit.Blown SECURITY light
bulb
Malfunction of the ECU.
Damaged or disconnected
wiring of a door key cylin-
der and the
liftgate unlock
switch input circuit.
Malfunction of a door key
cylinder and the liftgate un-
lock switch.
Malfunction of the ECU.
2.ACTIVATION / DEACTIVATION RELATIONSHIP
Trouble symptomCauseThere is no alarm when, as an
Damaged or disconnected
alarm test, a door is opened with-wiring of door switch (all
out using the key.doors) input circuit
(The arming and disarming arenormal, and the alarm is
acti-Malfunction of the door
vated when the liftgate or hood isswitch
opened.)
Malfunction of the ECUThere is no alarm when, as an
Damaged or disconnected
alarm test, the liftgate is opened
without using the key.wiring of liftgate switch in-
put circuit
(The alarm is activated, however,
by opening a door or the hood.)Malfunction of the liftgate
switch.
Malfunction of the ECU.Check methodCheck by using check
chart P.54-224.Check by using check
chart P.54-225.Check by using check
chart P.54-229.
If input checks
(P.54-220) indicate amalfunction, check by
using check chart
P&f-227.
Check method
If input checks
(P.54-220) indicate a
malfunction, check by
using check chart
P.54-225.
If input checks
(P.54-220) indicate a
malfunction, check by
using check chart
P.54-228.
Remedy
Replace the fusible link
No. (6) or the fuse No.
(19).Repair the harness.
Repair the harness or re-
place the door switch.
Replace the fusible linkNo. (6) or the fuse No.(1%
Repair the harness.
Replace the bulb.
Replace the ECU.
Repair the harness or re-
place a door key cylinderand the
liftgate unlock
switch.
Replace the ECU.
Remedy
Repairthe harness or re-
place the door switch.
Replace the ECU.
Repair the harness or re-
place the liftgate switch.
Replace the ECU.
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