1993 MITSUBISHI 3000GT check engine

Downloaded from www.Manualslib.com manuals search engine CIRCUIT DIAGRAMS - Windshield Wiper and Washer Circuit315
OPERATION/
LlWhen the wipe: switch is placed in the OFF
l When the wiper switch is placed in the LO
position, the cam contacts of wiper motor causesposition with the ignition switch in the ACC orcurrent to flow through the auto wiper stop
ON position, wipers operate continuously at lowcircuit, allowing the wiper blades to cycle before
speed.they reach to the stop position.
l Placing the wiper switch in the HI position
causes the wipers to operate at high speed.


lIf the washer switch is on for 0.6 second or
less when the ignition switch is at ON or ACC
lIf the wiper switch is turned to the INT positionwith the wiper switch turned off, the washer
when the ignition switch is in the ON or ACCliquid will not be poured but transistor will be
position, the voltage value from the intermittentturned on to operate the wipers one time.
variable volume switch is input to intermittent

’time detection circuit.
l The intermittent time detection circuit outputs
an H signal at the intermittent time according
to the set value of the intermittent variable
volume switch and, via OR, turns the Tr on
and off to operate the wiper.lIf the washer switch is on for 0.6 second or
more when the ignition switch is at ON or ACC
with the wiper switch turned off, the washer
liquid will be poured and the transistor will be
turned on 0.6 second later to operate the wipers
two or three times.
TROUBLESHOOTING HINTS
L
PhenomenonWipers do not operate Washer does not operate.
continuously
Washer operates.Inspecting method
lCheck the multi-purpose fuse No. 9l Check the wiper motor. (Refer to GROUPS-Windshield
Wiper and Washer.)l Check the column switch. (Refer to GROUPS-Windshield
Wiper and Washer.)Low-speed (or high-speed) wiper operation only is l
inoperative.Check the column switch. (Refer to GROUP51-Windshield Wiper and Washer.)
Wipers do not operate intermittently.
(They operate continuously.)lCheck the wiper switch “INT” input signal. (Refer
to GROUP
51-Troubleshooting.)l Check the column switch. (Refer to GROUPS-Windshield
Wiper and Washer.)
Wipers do not stop.lCheck the wiper switch “INT” input signal. (Refer
to GROUP
51-Troubleshooting.)l Check the column switch. (Refer to GROUP
51-Windshield Wiper and Washer.)
o Check the wiper motor. (Refer to GROUP
51-Windshield Wiper and Washer.)The intermittent time will not vary even if the variable l
intermittent wiper control switch is operated.
Check the variable intermittent wiper control switch
input signal. (Refer to GROUP S-Troubleshooting.)l Check the column switch. (Refer to GROUP
51-Windshield Wiper and Washer.)
Even if the washer switchThe wipers linked with the lCheck the washer motor. (Refer to GROUP
is on for 0.6 second or
washer operate.51-Windshield Wiper and Washer.)
more,. the washer will notlCheck the washer nozzle and washer tube.
operate.The wipers linked with the lCheck the washer switch input signal.
washer do not operate.l Check the washer switch. (Refer to GROUP51-Windshield Wiper and Washer.)
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Downloaded from www.Manualslib.com manuals search engine CIRCUIT DIAGRAMS - Rear Wiper and Washer Circuit
COMPONENT LOCATION
OPERATION

0 When the rear wiper switch is placed in the
ON position with the ignition switch in the ACC
or ON position, wipers operate continuously at
low speed.
l
When the rear wiper switch is placed in the
OFF position, the cam contains of wiper motor
causes current to flow through the auto wiper
stop circuit, allowing the wiper blades to cycle
before they reach to the stop positions.
i
l
When the rear wiper switch is placed in the
INT position with the ignition switch in ACC
or ON position, the rear intermittent wiper relay
is energized causing the rear intermittent wiper
relay contacts to close and open repeatedly.l
When the contacts are closed, the wiper motor
is energized.l
When the rear wiper motor is energized, the
rear intermittent wiper relay contacts open;
however, the cam contacts keep the rear wiper
motor energized until the wiper blades return
to their stop position.
TROUBLESHOOTING HINTS
1. Wipers do not operate.
(1) Washer is not operative, either.l
Check multi-purpose fuse No. 9.l
Check ground.
2.Low-speed wiper operation only is inoperative.l
Check wiper switch.
3. Wipers do not stop.l
Check wiper motor.l
Check rear intermittent wiper relay.l
Check rear wiper switch.
4. Intermittent wiper operation is inoperative.l
Check terminal voltage of the rear
intermittent wiper relay energized.
(Refer to GROUP 51-Windshield Wiper and
Washer for information concerning the
installation position of the intermittent wiper
relay.)
Terrr$al 1 Voltage
I
12v
0 3-b 12v
1 (alternating)
5. Washer is inoperative.l
Check washer motor.l
Check washer switch.
Check
Rear intermittent
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Downloaded from www.Manualslib.com manuals search engine CIRCUIT DIAGRAMS - Remote Controlled Mirror Circuit321 ~
OPERATIONTROUBLESHOOTING HINTSI
Ll When teh remote controlled mirror switch isNeither right nor left mirror operates
operated while the ignition key is in “ACC” or
“ON” position, current flows through fuse No.1) Also cigarette lighter does not operateI
5 remote controlled mirror switch, remotel Check multi-prpose fuse No. 5.
controlled mirror, remote controlled mirror2) Cigarette lighter operates
switch, and ground, causing the mirror to move.l Check remote controlled mirror switch.
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Downloaded from www.Manualslib.com manuals search engine CIRCUIT DIAGRAMS - Tension-reducer Type Seat Belt Circuit427OPERATION
L0If the driver fastens the seat belt with the ignition switch placed in the “ON” position, the seat belt
switch in the seat belt buckle is turned “ON” to operate the seat belt solenoid in the retractor.
0This will reduce the seat belt rewinding torqe to minimize a sense of oppression given by the belt.
lOwing to the timer function of the ETACS unit, the seat belt solenoid is kept in operation for 30 seconds
after turning off the ignition switch, with due consideration to elimination of the sudden rise in a senseof oppression caused by the belt immediately after the ignition switch is turned off.
TROUBLESHOOTING HINTS
PhenomenonInspection method
Some of the tension-reducers do not operates.0Check dedicated fuse No. 1 and 19.
0Check the inoperative seat belt switch.
lCheck the inoperative seat belt solenoid.
The tension-reducer does not operate with the ignition
0Check the ignition switch input signal.
switch placed in the ON position.
0 Check the ignition switch. (Refer to GROUP
M-Ignition switch.)
The tension-reducer is in operation immediately after the0Check the door switch input signal.
ignition switch is turned off, but it does not stop operationlCheck the door switch. (Refer to GROUP 42-Door
even if the door is opened within 30 seconds from theAssembly.)
turning-off the ignition switch.
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Downloaded from www.Manualslib.com manuals search engine 16-1
id
ENGINE
ELECTRICALCONTENTS
i;
CHARGING SYSTEM . . . . . . . . . . . . . . .2
GENERATOR. . . . ..*.............-.......12
ON-VEHICLE SERVICE.....................
6
Generator Output Line Voltage Drop Test.......6
Output Current Test..........................7
Regulated Voltage Test.......................9
Wave-form Check Using An Analyzer.........10
SPECIFICATIONS.........................2
General Specifications........................2
Service Specifications........................2
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . .3
IGNITION SYSTEM . . . . . . . . . . . . . . . .31
IGNITION SYSTEM . . . . . . . . . . . . . . . . . . . . . . .45
ON-VEHICLE SERVICE . . . . . . . . . . . . . . . . . . . .36
Camshaft Position Sensor
Check. . . . . . . . . .Refer to GROUP 13A
(ON-VEHICLE INSPECTION
OF
MFI COMPONENTS)Crankshaft Position Sensor
Check. . _ . . . . . . .Refer to GROUP 13A
(ON-VEHICLE INSPECTION
OF MFI COMPONENTS)
Ignition Primary Voltage Wave-form
Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Ignition Secondary Voltage Wave-form
Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .._.37
Ignition Timing Adjustment . . . Refer to GROUP 11
Spark Plug Cable Test . . . . . . . . . . . . . . . . . . . . .36
Spark Plug Test . . . . . . . . . . . . . . . . . . . . . . . . . . .36
SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . .31
SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . .31
General Specifications . . . . . . . . . . . . . . . . . . . *. .31
Service Specifications . . . . . . . . . . . . . . . . . . . . . .31
TROUBLESHOOTING.....................32STARTING SYSTEM...............
19
SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . .19~
General Specifications . . . . . . . . . . . . . . . . . . . . . .19
Service Specifications . . . . . . . . . . . . . . . . . . . . . .19
STARTER MOTOR . . . . . . . . . . . . . . . . . . . . . . . 23~
TROUBLESHOOTING . . . . . .-a.. . . . . . . . . . . . .20
L
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Downloaded from www.Manualslib.com manuals search engine ENGINE ELECTRICAL - Charging System16-5
OPERATION
When engine is stoppedWhen the ignition switch is switched to the “ON”
position, electricity flows from the
‘I” terminal of
the generator to the field coil, and at the same time
the charging warning light illuminates.
When engine is being started/has started
When the engine is started, charging voltage is ap-
plied to the ‘I” terminal of the generator, with the
result that the charging warning light is extinguished.
In addition, because battery voltage is applied to
the “S” terminal of the generator, this battery voltage
is monitored at the
IC voltage regulator, thus switch-ing ON and OFF the current to the field coil and
thereby controlling the output voltage of the genera-
tor.
Power is supplied to each load from the “B” terminal
of the generator.
NOTE
The generator relay functions as a back-up for the
flow of electricity to the field coil if there is a discon-
nection or damaged wiring of the charging warning
light.
COMPONENT LOCATION
Name/ Symbol 1
1 Generator relayI A I
TROUBLESHOOTING HINTS1. Charging warning light does not go on when
the ignition switch is turned to “ON”, before the
engine starts.l Check the bulb.
2.Charging warning light fails to go off once the
engine starts.l
Check the IC voltage regulator (located with-
in the generator).
3. Discharged or overcharged battery.l
Check the IC voltage regulator (located with-
in the generator).4. The charging warning light illuminates dimly.
l Check the diode (within the combination
meter) for a short-circuit.
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Downloaded from www.Manualslib.com manuals search engine 16-6ENGINE ELECTRICAL - Charging System
ON-VEHICLE SERVICEGENERATOR OUTPUT LINE VOLTAGE DROP TEST
+I I.=-@=
Voltmeter
This test determines whether the wiring from thegenerator
“B” terminal to the battery (+) terminal
(including the fusible link) is in a good condition
or not.(1) Always be sure to check the following before
the test.l Generator installation
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) Disconnect the generator output wire from the
generator
‘73” terminal and connect a DC testammeter with a range of 0
- 100 A in series
between the “B” terminal and the disconnected
output wire. (Connect the
(+) lead of the amme-ter to the
‘73” terminal, and then connect the
Battery
6EN0962(-) lead of the ammeter to the disconnected
output wire.)
NOTE
A clamp-type ammeter which enables measure-
ments to be taken without disconnecting thegenerator output wire is recommended. The
reason for this is if a vehicle in which the voltage
may have dropped due to an imperfect connec-tion at the generator
“B” terminal is being in-
spected, and the generator “B” terminal is loos-
ened when the test ammeter is connected, the
connection will be completed at this time andthe possibility of finding problems will be re-
duced.
(5) Connect a digital-type voltmeter between thegenerator
“B” terminal and the battery (+)
terminal. (Connect the (+) lead of the voltmeterto the “B” terminal, and then connect the
(-)
lead of the voltmeter to the battery (+) cable.)
’
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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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