check engine MITSUBISHI 3000GT 1993 2.G Owner's Manual

Downloaded from www.Manualslib.com manuals search engine CIRCUIT DIAGRAMS - Buzzer Circuit211
OPERATION
L
lBattery positive voltage is continuously applied to the key-reminder switch.l
If the driver’s door is opened (door switch ON) with the key inserted in the ignition switch (key-reminderswitch ON), the buzzer sounds to warn that the key has been left in the switch.
&eat belt warning>
lWhen the ignition switch is turned on, the timer circuit and pulse circuit will flicker the seat belt warning
light for approx. 6 seconds with the buzzer intermittently sounding.
lIf the seat belt is fastened for the while, the seat belt switch will be turned off and the buzzer will
stop.
TROUBLESHOOTING HINTS
/
L
ProblemCheck methodThe key-reminder The seat belt warning function l
Check the door switch.
warningdoesn’t is OK.(Refer to GROUP 42-Door Assembly.)
sound.The seat belt warning also l Check the buzzer.
doesn’t function.(Refer to GROUP 52A-Seat Belt.)
The seat belt warn-The seat belt warning light lCheck the seat belt switch.
ing doesn’t
func- flashes.(Refer to GROUP 52A-Seat Belt.)
tion.The seat belt warning light l Check the key-reminder switch.
also does not function (and(Refer to GROUP M-Ignition Switch.)
the key-reminder warning
also does not function).
The buzzer doesn’t stop even through the driver’slCheck the seat belt switch.
seat belt has been buckled.(Refer to GROUP 52A-Seat Belt.)
The seat belt warning light doesn’t flashes (but thelCheck the light bulb.
buzzer sounds).lCheck the key-reminder switch.(Refer to GROUP 54-Ignition Switch.)
lCheck the seat belt switch.
(Refer to GROUP
52A-Seat Belt.)
The warning light does not flash and the warninglCheck the ignition switch input signal.buzzer also does not sound.(Refer to GROUP 52A-Troubleshooting.)l Check the key-reminder switch.
(Refer to GROUP 54-Ignition Switch.)
lCheck the seat belt switch.
(Refer to GROUP 52A-Seat Belt.)
The warning light flashes, but the warning buzzer l
Check the key-reminder switch.
does not sound.(Refer to GROUP M-Ignition Switch.)lCheck the seat belt switch.
(Refer to GROUP 52A-Seat Belt.)
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Downloaded from www.Manualslib.com manuals search engine CIRCUIT DIAGRAMS - Power Window Circuit221OPERATION
lTurn on the ignition switch, and the transistor Tr will be turned on by the timer circuit. This will turn
on the power window relay allowing the power window to be opened and closed.
lTurn the ignition switch from on to off, and the timer circuit will be activated to keep transistor Tr
on for 30 seconds allowing the power window to be opened and closed.
Moreover, if the front door is opened, the timer circuit will stop to turn off the transistor Tr. This
will prevent the window from being opened and closed.
TROUBLESHOOTING HINTS
’
PhenomenonInspection method
All door windows cannot be opened or closed.
eCheck fusible link No. 9.
0 Check the power-window relay.
lCheck the power-window main switch.
One of the door windowsNeither of the power- l
Check the power-window main switch.cannot be opened or
window switches (main l
closed.
Check the power-window motor for the power window that
or sub) operatesdoes not operate.Either the power-win- lCheck the power-window switch for the power window
dow main switch or subthat does not operate.
switch does not oper-ate.
The one-touch down switch function only does notlReplace the power-window main switch.
operate.
The power windows do not operate when the ignition
lCheck the ignition switch input signal. (Refer to GROUP
switch is at the “ON” position.
42-Troubleshooting.)
0Check the ignition switch. (Refer to GROUP 54-Ignition
Switch.)
lCheckthepowerwindow relay. (RefertoGROUP42-Power
Window)The power windows can be opened and closed l
Check the front door switch input signal. (Refer to GROUP
immediately after ignition switch is switched “OFF”,42-Troubleshooting.)
but the power window operation does not stop if al
front door is opened within 30 seconds.
Check the front door switch. (Refer to GROUP 42-DoorAssembly.)
The opening and closing operations of the power l
Check the power window relay. (Refer to GROUP 42-Power
windows are possible after the timer operation timeWindow.)
has elapsed when the ignition switch is set to the
“OFF” position.
/
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Downloaded from www.Manualslib.com manuals search engine CIRCUIT DIAGRAMS - Central Door Locking Circuit237
OPERATION/
Li!l
When the door lock switch is set to the LOCKside (or UNLOCK side), the LOCK side (or
UNLOCK side) of the door lock relay is turned
ON and the door actuators of all doors operate.l
If the driver seat side door (or assistant seat
side door) is opened and the driver seat side
inside lock knob (or assistant seat side inside

0
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0
With the driver’s and front passenger’s doorsunlocked, press the LOCK switch of the
transmitter, and the door lock signal output (0V) will be sent from the
keyless entry control
unit terminal No. 12 closing the door lock powerrelays 1 and 2 to lock the driver’s and front
passenger’s doors.
While the R.H. and L.H. doors are in the lockedstate, press the UNLOCK switch of the
transmitter once, and the DOOR UNLOCK
switch signal (0 V) will be sent from the keylessentry control unit terminal No. 14 closing the
door lock power relay 2 to unlock the driver’s
door.
Under the above-mentioned conditions, further
press the UNLOCK switch of the transmitter,and the DOOR UNLOCK signal output (0 V)
will be sent from the keyless entry control unitterminal No. 13 closing the door lock power
relay 1 to lock the front passenger’s door.
When the keyless entry system is operated toturn the driver’s door lock switch from the
UNLOCK position to the LOCK position, thelock knob) is locked with the key inserted in
the ignition switch, the ETACS unit grounds the
unlock side circuit of the door lock relay to unlock
all doors. This way, failure to remove the key
is prevented.dome light/foot light blinking signal output
(system voltage) will be sent twice from the
keyless entry control unit terminal No. 11 when
the door lock switch is turned from the LOCK
position to the UNLOCK position, the lighting
signal output (0 V) will be provided for approx.
3 seconds.
NOTE
The dome light winks or comes on when the domelight switch is in the DOOR interlock position.
However, the dome light does not wink while it .is
ON for 6 seconds after closing the door by ETACS
function.Besides the above-mentioned operations, the
keyless entry control unit has the following functions.l
If any door is not opened or closed within 30
seconds from unlocking the door by means ofthe
keyless entry system, the door is
automatically locked.In addition, if the
cryptographic code other than the code storedin the receiver memory is received 30 times
in one minute continuously, operation of the
unit is suspended for 10 minutes.l
Operation is also suspended if the ignition key
remains inserted (key reminder switch: OFF)
and either door is left open (door switch: ON).TROUBLESHOOTING HINTS

Phenomenon
Inspection method
One of the door lock actuators fails to operate.
0Check the door actuator which fails to operate.
No unlock operation can be made by pressing door lock0
knob after fulfilment of following conditions.Check the key reminder switch input signal.0Check the key reminder switch. (Refer to GROUP
0Insertion of key in ignition switch (key reminder switch54-Ignition Switch.)
OFF)0
0Opening of door (door switch ON)Check the front door switch input signal.0 Check the front door switch. (Refer to GROUP
42-Door Assembly)
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Downloaded from www.Manualslib.com manuals search engine 238CIRCUIT .DIAGRAMS - Central Door Locking Circuit
l
The indicator does not blink after pressing thetransmission switch of the transmitter.
1) Check or replace the battery. (Refer to
GROUP
42-Keyless Entry System.)
2) Replace the transmitter.
l Transmitted wave is being sent from thel
R.H. and L.H. doors can be locked and unlocked
by the transmitter but the dome light and footlight do not blink or come on. (Interlocked
lighting of the dome light and foot light by means
of the dome light switch or door opening and
closing is normal).
transmitter (indicator is blinking), but the system
does not operate.1) Check the cryptographic code registering
method. (Refer to GROUP
42-Keyless
Entry System.)
2)Check the keyless entry control unit terminalvoltage. (Refer to GROUP
42-Trouble-
shooting.)3) Check the coaxial cable of antenna and
the ground wire for connection.
l Only R.H. or L.H. door can be locked or
unlocked.
1)Check the door lock power relay 1 (for front
passenger’s door) or door lock power relay2 (for driver’s door). (Refer to GROUP
42-Central Door Locking System.)
2)Check the keyless entry control unit terminalvoltage. (Refer to GROUP
42-Trouble-
shooting.)
1)Check the keyless entry control unit terminal
voltage (Refer to GROUP
42-Troubleshoot-
ing.)2) Check the harness.
NOTE
l :Perform this check when replacement of the
transmitter and/or
keyless entry control unit or
faulty storage of cryptographic code has been
made.
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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.
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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
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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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