Group 31 MITSUBISHI 3000GT 1995 2.G User Guide

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
I
I

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.)
’
1 TSB Revision

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
1 TSB Revision

Downloaded from www.Manualslib.com manuals search engine 16-8ENGINE ELECTRICAL - Charging System
This test determines whether the generator outputs
normal current.(1) Before the test, always be sure to check the
following.l Generator installation
l
Battery (Refer to GROUP 54 - Battery.)
NOTE
The battery to be used should be slightly dis-charged. The load in a fully-charged battery
will be insufficient and the test may not be able
to be carried out correctly.l Generator drive belt tension (Refer to
GROUP 11- On-vehicle 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
“B” terminal and connect a DC testammeter with a range of O-100 A in series
between the “B” terminal and the disconnected
output wire. (Connect the
(+) lead of the amme-ter to the
“B” terminal, and then connect the(-) lead of the ammeter to the disconnected
output wire.)
Caution
Never use clips but tighten bolts and nutsto connect the line.
Otherwise loose
connections (e.g. using clips) will lead to
a serious accident because of high current.
NOTE
A clamp-type ammeter which enables measure-
ments to be taken without disconnecting the
generator output wire is recommended.(5) Connect a voltmeter with a range of 0
- 20
V between the generator “B” terminal and the
ground. (Connect the
(+) lead of the voltmeterto the “B” terminal, and then connect the (-)
lead of the voltmeter to the ground.)
(6) Connect a tachometer. (For the procedure forconnecting the tachometer, refer to GROUP
11 - On-vehicle Service.)
(7) Connect the negative battery cable.
(8) Leave the hood open.(9) Check to be sure 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 “B” terminal and the battery
(+)
terminal.
(1O)After turning the light switch on and turning on
the headlights, start the engine.
(1l)lmmediately after setting the headlights to high
beam and turning the heater blower switch to
the high revolution position, increase the enginespeed to 2,500
r/min and read the maximum
current output value displayed on the ammeter.
Limit value: 70% of nominal current output
NOTEl
For the nominal current output, refer to the
Generator Specifications.l
Because the current from the battery will
soon drop after the engine is started, the
above step should be carried out as quickly
as possible in order to obtain the maximum
current output value.l The current output value will depend on
the electrical load and the temperature of
the generator body.l
If the electrical load is small while testing,the specified level of current may not be
output even though the generator is normal.
In such cases, increase the electrical load
by leaving the headlights turned on for sometime to discharge the battery or by using
the lighting system in another vehicle, and
then test again.l
The specified level of current also may not
be output if the temperature of the generator
body or the ambient temperature is too high.
In such cases, cool the generator and then
test again.
(12)The reading on the ammeter should be above
the limit value. If the reading is below the limit
value and the generator output wire is normal,
remove the generator from the engine and check
the generator.(13)Run the engine at idle speed after the test.
(14)Turn the ignition switch to the OFF position.
(15)Disconnect the negative battery cable.
(16)Disconnect the ammeter, voltmeter and
tachometer.(17)Connect the generator output wire to the
generator “B” terminal.
(18)Connect the negative battery cable.
TSB Revision

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
TSB Revision
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 16-12ENGINE ELECTRICAL - Charging System
GENERATORREMOVAL AND INSTALLATION
Pre-removal and Post-installation Operationl Removal and Installation of Right Bank Warm Up
Three-Way Catalytic Converter(Refer to GROUP 15-Exhaust Pipe, Main Mufflerand Catalytic Converter.)14-18ft.lbs.
l b
Removal steps
1. Air hose E 2. Air hose C
3. Suction hose clamo nuts
conditioning,4. Drive belt
(Refer to GROUP 11
-Engine Adjustment.)
216FO346
5. Generator connector
6. Heated oxygen sensor connector
7. Generator and generator bracket
assembly8. Generator bracket
9. Generator
lo-12 Nm7-9 ft.lbs.24 NmREMOVAL SERVICE POINT
dAbCLAMP NUT REMOVAL
On vehicles with an air conditioning, remove the clamp
nut, raise the suction hose and suspend it from the engine
hood using a cord.
1 TSB Revision

Downloaded from www.Manualslib.com manuals search engine ENGINE ELECTRICAL - Starting System16-23
OPERATION
L
0For models equipped with the M/T, the clutch
pedal position switch contact is switched OFF
when the clutch pedal is depressed; when the
ignition switch is then switched to the “ST’ posi-tion, electricity flows to the starter relay and
the starter motor, the contact (magnetic switch)of the starter is switched ON and the starter
motor is activated.
NOTEIf the ignition switch is switched to the “ST
position without the clutch pedal being de-
pressed, electricity flows to the starter relay
(coil), the clutch pedal position switch (contacts)
and to ground, with the result that the contacts
of the starter relay are switched OFF, and, be-
cause the power to the starter motor is thereby
interrupted, the starter motor is not activated.lFor models equipped with the
AIT, when the
ignition switch is switched to the “ST’ position
while the selector lever is at the “P” or “N” posi-
tion, the contact (magnetic switch) of the starter
is switched ON and the starter motor is activated.
TROUBLESHOOTING HINTSThe starter motor does not operate at all.
l Check the starter (coil).
lCheck for poor contact at the battery terminals
and starter.l Check Park/Neutral position switch.
l Check clutch pedal position switch.
l Check starter relay.
l Check theft-alarm starter relay.
l Check key reminder switch.
i
/’
L&J
Fieldcoil wire
Iii?Stopper
IPinion gap
PinionZ6EL003
STARTER MOTORREMOVAL AND INSTALLATION
Refer to GROUP 22
- Manual Transaxle, or GROUP 23 -
Automatic Transaxle.INSPECTION
PINION GAP ADJUSTMENT(1) Disconnect field coil wire from M-terminal of magnetic
switch.
(2)Connect a 12 V battery between S-terminal and M-terminal.(3) Set switch to “ON”, and pinion will move out.
Caution
This test must be performed quickly (in less than 10
seconds) to prevent coil from burning.(4) Check pinion to stopper clearance (pinion gap) with a
feeler gauge.
Standard value: 0.5-2.0 mm (.020-,079 in.)
TSB Revision

Downloaded from www.Manualslib.com manuals search engine /
LiENGINE ELECTRICAL
- lanition Svstem16-37
--7EL0134IGNITION SECONDARY VOLTAGE WAVE-FORM
CHECK
MEASUREMENT METHOD
(1) Clamp SECONDARY PICKUP around spark plug cable.
NOTE
1.The ignition voltage peak appears reversely betweenwhen the spark plug cables of the cylinders
No.4,
No. 5 and No. 6 are clamped and when those of thecylinders No. 1, No. 2 and No. 3 are clamped.
2. Since the
2-cylinder simultaneous ignition system is
employed, the wave-form for two cylinder appears
group by group when the wave-form is observed.
(Cylinder No. 1- cylinder No. 4, cylinder No. 2 -cylinder No. 5 and cylinder No. 3
- cylinder No. 6
as the respective groups) Here, the wave-form is
observed for the cylinder whose spark plug cable is
clamped with the secondary pickup.(2) Clamp the spark plug cable with the trigger pickup.
NOTE
1. Clamp the spark plug cable of the cylinders No.1,
No. 2 or No. 3 which belongs to the same group of
the cylinders clamped with the secondary pickup.2. Though it is difficult to isolate the cylinder of the
wave-form, the wave-form of the cylinders clampedwith the secondary pickup is stable. Use this as a
reference for isolation.
TSB Revision

Downloaded from www.Manualslib.com manuals search engine ENGINE ELECTRICAL - lanition Svstem16-41
/
L
i
Analyzer
GroundL
01L1008
STANDARD WAVE-FORM
Observation ConditionsIGNITION PRIMARY VOLTAGE WAVE-FORM
CHECK
MEASUREMENT METHOD
(1)Remove the ignition coil connector and connect the special
tool (harness connector: MD998464) in between.
(2) When observing the No. 1 - No. 4 cylinder group, connectthe primary pickup of the analyzer probe to the ignition
coil side connector terminal No. 2 (black clip on the special
tool).
For the No. 2 - No. 5 cylinder group, connect to terminal
No. 1 (red clip), and for the No. 3
- No. 6 cylinder group,connect to terminal No. 4 (white clip).
(3) Ground the primary pickup ground terminal.
(4) Clamp the spark plug cable with the trigger pickup.
NOTE(1) Clamp the spark plug cable of cylinder No. 1, No.
2 or No. 3 which belongs to the same group of the
cylinder to which the primary pickup is connected.
(2) The wave-form of any cylinder in the same group
is displayed on the left side of the screen.
FUNCTION
PRIMARY
PATTERN HEIGHTHIGH (or LOW)
PAVERN SELECTOR
Engine revolutionsRASTER
Curb idle speed
(V)
100
Primary Primary*ignition ignition
voltage voltage
wave-form
owave-formkr
0
Zener
voltage
(Point C)
Dwell
section
b
Spark line (Point A)
/b-4
Wave damping reduction section (Point B)
/
Time
7EL0149
/ TSB Revision

Downloaded from www.Manualslib.com manuals search engine ENGINE ELECTRICAL - Ignition System16-45 l
IGNITION SYSTEM
LREMOVAL AND INSTALLATIONI
i
27EN0520
413 NmIlOft.lbs.
d
12 Nm
9 ft.lbs.
22 Nm16ftAbs.B678
W1
,A4
Removal stepsl Intake manifold plenum (Refer to
GROUP
1.5 - Intake Manifold.)1. Center cover
2. Spark plug cable
3. Spark plug
4. Ignition coil
5. Ignition power transistor
6. Crankshaft position sensor
cl 992 models>9 Nm
7
ft.lbs.u 16FO453
00662527
7. O-ring cl992 models>
8. Clamp Camshaft position sensor, Crankshaft
positionsensor removal steps models>l Timing belt cover (Refer to GROUP
11 - Timing Belt)
9. Camshaft position sensor
10. Crankshaft position sensor
TSB Revision