change wheel MITSUBISHI 3000GT 1991 Service Manual

00-18
GENERAL - Towing and Hoisting
Frame contact support location:
1,070 mm (42.0 in.): 1,130 mm (44.0 in.) OOFOO3'
Front OOFO046HOISTING
POST TYPESpecial care should be taken when raising the vehicle on a
\frame contact type hoist. The hoist must be equipped with theL)proper adapters in order to support the vehicle at the proper
locations.
Caution
When service procedures require removing rear suspen-sion, fuel tank, spare tire and liftgate, place additional
weight on rear end of vehicle or anchor vehicle to hoist toprevent tipping of center of gravity changes.
FLOOR JACKThe usual type of floor jack is used at the following locations.
Front: Under the mid point of No. 1 crossmember
NOTEOn vehicles with active-aero system, the front jacking point
can be accessed by removing the center cover panel from
the under cover. Be sure to reinstall the center cover panel
after jack-up operation.
Rear:
Under the jack up bracket of crossmember
Under the rear differential
Caution1. When lifting the No. 1 crossmember, do not allow jack
lifting plate to contact under cover.
2. In order to prevent scarring the crossmember, place a
piece of cloth on the jack’s contact surface (to prevent‘corrosion caused by damage to the coating).
d3. A floor jack must never be used on any part of the
underbody.
4.Do not attempt to raise one entire side of the vehicle by
placing a jack midway between front and rear wheels.This practice may result in permanent damage to the
body.
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FUEL SYSTEM - Troubleshootina13-17
PROBLEM SYMPTOMS TABLE (FOR YOUR INFORMATION)
I;
L
/
L/
Items
Won’t start(no initial combustion)-g Starting problem
2(i;il;i combustion, then
Symptom
The starter is used to crank the engine, but there is no combustion within the
cylinders, and the engine won’t start.
There is combustion within the cylinders, but then the engine soon stalls.(Starting takes a long
time.)Engine won’t start quickly.
Idling instability
(Rough idling)Engine speed doesn’t remain constant; changes during idling.Usually, a judgement can be based upon the movement of the tachometer
>.rpointer, and the vibration transmitted to the steering wheel, shift lever, body, etc.
EThis is called rough idling.
s0
Incorrect idling speedThe engine doesn’t idle at the usual correct speed.
F.-=e-ImpDr;p;ertidling continuityThis non-continuity of idling includes the following elements.(1) Die outPass out. . . . . The engine stalls when the foot is taken from the accelerator pedal,regardless of whether the vehicle is moving or not.(2) Pass out . . The engine stalls when the accelerator pedal is depressed or while
it is being used.
Hesitation
Sag
“Hesitation” is the delay in responseHesitation
of the vehicle speed (engine rpm) thatLNormaloccurs when the accelerator pedal is
depressed in order to accelerate from---
the speed at which the vehicle is nowx\a,r- ,
traveling, or a temporary drop in vehi-g Initialv) accelerator**’ ,8’ /cle speed (engine rpm) during such+ pedal/,’ /
’
acceleration.2 depression
Serious hesitation is called “sag”.2
1“*’.’
/’ ,’I&L-e**’Ii Sag
Poor acceleration
Time1 FU022:
Poor acceleration is inability to obtain an acceleration corresponding to thedegree of throttle opening, even though acceleration is smooth, or the inability toreach maximum speed.
0, Stumble.F
‘iIn
Engine rpm response is delayed when
the accelerator pedal is initially.
depressed for acceleration from thestopped condition.
$Normal
x
:Initial
3acceleratorI//
c
-7
pedal2 depression,#’,
4,/Idling *--’Stumble
Shock
cTime1 FUO22L
The feeling of a comparatively large impact or vibration when the engine isaccelerated or decelerated.
SurgeThis is repeated surging ahead during constant speed travel or during variable
speed travel.
Knocking
A sharp sound like a hammer striking the cylinder walls during driving and which
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13-102FUEL SYSTEM - On-vehicle Inspection of MPI Components
TROUBLESHOOTING HINTSHint 1: If the engine is hard to start when hot, check fuel pressure and check the injector for leaks.
Hint 2:If the injector does not when the engine that is hard to start is cranked, the following as well as the
Iinjector itself may be responsible.
(1) Faulty power supply circuit to the engine control unit, faulty ground circuit
\-J
-(2) Faulty control relay
Hint 3:(3) Faulty crank angle sensor, top dead center sensor
If there is any cylinder whose idle state remains unchanged when the fuel injection of injectors is cut
one after another during idling, make following checks about such cylinder.
(1) Injector and harness check
(2) Ignition plug and high tension cable check
(3) Compression pressure check
Hint 4: If the injector harness and individual part checks have resulted normal but the injector drive time is
out of specification, the following troubles are suspected.
(1)Poor combustion in the cylinder (faulty ignition plug, ignition coil, compression pressure, etc.)
(2) Loose EGR valve seating
(3) High engine resistance
INSPECTIONUsing Multi-use Tester
FunctionItem No. Data displayCheck conditionCoolant temperatureStandard valueData reading 41
Drive time”’Engine: Cranking0°C (32”F)*zApprox. 17 ms
20°C (68°F)Approx. 46 ms
8O"C(176"F)Approx. 11 ms
Function
Data readingItem No.Data display
41Drive time*3l Engine coolant tem-perature: 80 to 95°C700 rpm (Idle)2.4-3.0 ms
(176 to 205°F)2,000 rpm2.0-2.6
msl Lamps, electric coolingfan, accessory units:When sharp racing isTo increaseAll OFF
madel Transaxle: Neutral
(P range for vehicle
with A/T)l Steering wheel: Neutral
Check conditionEngine stateStandard value ,
.---NOTE“I : The injector drive time refers to when the supply voltage is 11 V and the cranking speed is less than 250 rpm.*2: When coolant temperature is lower than 0°C (32°F). injection ismade by four-cylinders.---simultaneously.
“3: When the vehicle is new [within initial operation of about 500 km (300 miles)], the injector drive time may be about
10% longer.
Function
Actuator testItem No.
Drive content
Check conditionNormal state
01No. 1 injector shut offEngine: Idling afterIdle state to change
02No. 2 injector shut offwarm-up
(Shut off the injectorsfurther (becoming less
in sequence during afterstable or stalling)
03
No. 3 injector shut offengine warm-up, check
04No. 4 injector shut offthe idling condition)
05No. 5 injector shut off
06No. 6 injector shut off
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13-106FUEL SYSTEM - On-vehicle Inspection of MPI Components
INSPECTION
Using Multi-use Tester
FunctionItem No.Data displayCheck conditionCoolant temperatureStandard value‘L,,,J
DataDrive time*’0°C (32’F)*’readingiRea:bankiEngine: CrankingApprox. 53 ms
(FronT7bank)20°C (68°F)
Approx. 29 ms
80°C (176°F)Approx. 7 ms
FunctionItem No.
Data displayCheck conditionEngine stateStandard value
Datareading(Reaebank)Drive time*3l Engine coolant tem-700 rpm (Idle)1.9 - 2.5 ms
perature: 80 to 95°C
(Front7banki(176 to 205°F)2,000 rpm1.6 - 2.2 ms
l Lamps, electric coolingfan, accessory units:To increase
All OFFWhen sharp racing is
made
l Transaxle: Neutral(P range for vehicle
with A/T)
l Steering wheel: Neutral
NOTE“I : The injector drive time refers to when the supply voltage is 11 V and the cranking speed is less than 250 rpm.
“2: When coolant temperature is lower than 0°C (32°F). injection is made by four cylinders simultaneously.
“3: When the vehicle is new [within initial operation of about 500 km (300 miles)], the injector drive time may be about
10% longer.
Function
Actuator testItem No.
Drive contentCheck conditionNormal state
01No. 1 injector shut offEngine: Idling afterIdle state to changewarm-upfurther (becoming less
02No. 2 injector shut off(Shut off the injectorsstable or stalling)
03in sequence during afterNo. 3 injector shut offengine warm-up, checkthe idling condition)
04No. 4 injector shut off
05
No. 5 injector shut off
06
No. 6 injector shut off
\,iUsing
OscillqscopeI(1) Run the engine at idle speed.
(2) Connect the probe to the oscilloscope pick-up point as
shown in the circuit diagram, and check the waveform at
the drive side of each injector.~
-
LJ
4 AL A: InjectorNormal waveformdrive time03A0209
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33A-4FRONT SUSPENSION - Service Adjustment Procedures
Strut lowermounting bolt(upper)
\/
0 camber@ camber12FOO31
SERVICE ADJUSTMENT PROCEDURES
M33FBAT
FRONT WHEEL ALIGNMENT‘d
TOE-INStandard value: 0 2 3 mm (0 +
.12 in.)
1. Adjust the toe-in by undoing the clips and turning the left
and right tie rod turnbuckles by the same amount (in
opposite directions).
2.After making the adjustments, use a turning radius gauge to
confirm that the steering wheel turning angle is within thestandard value range. (Refer to GROUP 37A
- Service
Adjustment Procedures.)Standard value:
Inner wheel
33”45’Outer wheel
28”21’
CAMBER AND CASTERStandard value:
Camber0” IL 30’
Caster3”55’ IL 30’
Install the special tool by tightening it to the same torque as
that applied to the drive shaft nut.
a
To adjust camber, turn the strut lower mounting bolt (upper).
One graduation is equivalent to about 20’ in camber. Caster hasbeen factory-adjusted to the standard value and requires no
adjustment.
Caution
1.One camber graduation changes toe by about 0.5 mm
(.02 in.). Be sure to adjust toe after camber has been
adjusted.
2.The difference in camber between right and left shouldbe within
O”30’.
WHEEL BEARING ADJUSTMENTM33FCAA
Bearing preload is pre-set to the specified value by design andtherefore can not be adjusted.
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1

339-l 6ELECTRONIC CONTROL SUSPENSION (ECS) - ;;:%,:?‘Stment5. CONTROL FUNCTION SIMULATION CHECK
Using the MUT, check all control functions during operationwith the vehicle in stationary condition.
5-1. Anti-Roll Control Function Check:d
(1) Raise the front wheels on a jack and have them supportedby rigid racks.
(2) Place the steering wheel in straight ahead position.
(3) Select the Tour mode by the ECS switch.
(4) Enter a simulated vehicle speed of 100 km/h (62 mph) fromthe MUT.
(5) Using the MUT, check the indications of service data itemsNo. 61 through 64.
MUT indication: SOFT
12FOO64(6) Turn the steering wheel clockwise or counterclockwise
from the straight ahead position.
(7) Using the MUT, check that the indications of service dataitems No. 61 through 64 change over.
Approx. 0.2 seconds for 90” rotation
(8) Check that the original damping force indication (SOFT) isrestored a second later.
5-2. Anti-Dive Control Function Check
(1) Select the Tour mode by the ECS switch.
(2) Enter a simulated vehicle speed of 100 km/h (62 mph) fromthe MUT.
(3) Using the MUT, check the indications of service data itemsNo. 61 through 64.
MUT indication: SOFT
(4) Depress the brake pedal and simultaneously change the
entered simulated vehicle speed by the MUT. (Change thespeed in 0.4 seconds after depressing the brake pedal.)
(5) Using the MUT, check that the indications of service dataitems No. 61 through 64 change over.
Changing entered simulated
vehicle speedMUT indication
100 km/h (62 mph) to 80 km/h (50 mph)HARD
(6) Check that the original damping force indication (SOFT) isrestored a second later.
Ls5-3. Anti-Squat Control Function Check
(1) Select the Tour mode by the ECS switch.
(2) Enter a simulated vehicle speed of 30 km/h (19 mph) fromthe
MUT.
(3) Using the MUT, check the indications of service data itemsNo. 61 through 64.
MUT indication: SOFT
l/i
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REAR SUSPENSION - Service Adjustment Procedures34-5
0 camber
“\
er
ewer arm (L.H.)A-L!?., ’ cLr”“l‘412F002E
SERVICE ADJUSTMENT PROCEDURES
REAR WHEEL ALIGNMENT INSPECTIONM34FAAH
CAMBERStandard value: 0” + 30
To adjust camber, turn the lower arm mounting bolt
(cross-
member side).
NOTE(1) Make the adjustment with the assist link mounting bolt
(crossmember side) loosened.
(2) The difference between the right and left wheels should be30’ or less.
(3) Left wheel: Clockwise
(0 camber)
Right wheel: Clockwise
(0 camber)
One graduation changes camber by about 15’.
TOE-INStandard value: 0.5
-+ 2.5 mm (.Ol + .09 in.)
To adjust toe, turn the assist link mounting bolts (on crossmem-ber side) on both sides
t,he same amount.
NOTE
(1) The difference between right and left wheels should be 3mm (.I2 in.) or less.
(2) Left wheel: Clockwise (toe-in)
Right wheel: Clockwise (toe-out)
One graduation changes toe by about 4.8 mm
(.19 in.)
.
Caution1. Adjust the eccentric bolt within 90” from the central
position.
2.Adjust camber and toe, in that order, and, if camber isadjusted, be sure to adjust toe also.
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REAR SUSPENSION - Service Adjustment Procedures34-23
SERVICE ADJUSTMENT PROCEDURES
REAR WHEEL ALIGNMENT INSPECTIONM34FDACCAMBER
Standard value:
-0”lO’ + 30’
To adjust camber, turn the lower arm mounting bolt on the
crossmember side.
NOTE
12FOO21Left wheel: Clockwise (0 camber)
Right wheel: Clockwise
(0 camber)
The difference between the right and left wheels
shoiuld be 30’
or less.
One graduation changes camber by about 12’.
\Trailing arm (L.H.)
\\12A0083
17FllO75TOE-IN
Standard value: 0.5
-t 2.5 mm (.Ol + .09 in.)
To adjust toe, turn the trailing arm mounting bolts on the
crossmember side on both sides the same amount.
NOTELeft wheel: Clockwise (toe-in)
Right wheel: Clockwise (toe-out)
The difference between right and left wheels should be 3 mm
(.12 in.) or less.
One graduation changes toe by about 2 mm
(.08 in.).
Caution
1. Adjust the eccentric cam bolt within 90” from’ the
central position.
2.Adjust camber and toe, in that order, and, if camber is
adjusted, be sure to adjust toe also.
3.For the vehicles with 4WS, make the adjustments with
the 4WS tie rod end disconnected from the trailing arm.
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L.
SERVICE BRAKES -Service Adjustment Procedures35-53
I14A0398
14F003r
i14A04014NOO27
7
FRONT BRAKE DISC RUN-OUT CORRECTION
M35FFAC
1.If the run-out of the brake’disc is equivalent to or exceeds
the limit specification, change the phase of the disc and
hub, and then measure the run-out again.
(1) Before removing the brake disc, chalk both sides of the
wheel stud on the side at which run-out is greatest.
(2) Remove the brake disc, and then place a dial gauge as
shown in the illustration; then move the hub in the axial
direction and measure the play.
Limit: 0.05 mm (.002 in.)
If the play is equivalent to or exceeds the limit, replace
the front hub unit bearing.
(3) If the play does not exceed the limit specification, and
then check the run-out of the brake disc once again.
Mount the brake disc on the position dislocated from
the chalk mark.
2.If the run-out cannot be corrected by changing the phase of
the brake disc, replace the disc.
REAR DISC BRAKE PAD CHECK AND REPLACE-
MENTM35FUAE
1.Check brake pad thickness through caliper body check port.
Standard value: 10.0 mm
(39 in.)
Limit: 2.0 mm
(08 in.)
Caution
1.When the limit is exceeded, replace the pads at both
sides, and also the brake pads for the wheels on the
opposite side at the same time.
2.If there is a significant difference in the thicknesses
of the pads on the left and right sides, check the
sliding condition of the piston, lock pin sleeve and
guide pin sleeve.
2. Loosen the parking brake cable (from the vehicle interior),
and disconnect the parking brake end installed on the rear
brake assembly.
3. Remove lock pin. Lift caliper assembly and retain with
wires.
Caution
Do not smear special grease on lock pin or make it
dirty.
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35-58SERVICE BRAKES - Service Adjustment Procedures
POINTS IN WAVEFORM MEASUREMENT
Symptom
Too small or zero waveform
amplitudeProbable causes
Faulty wheel speed sensorRemedy
Replace sensor
Incorrect pole piece-to-rotor clearance
Adjust clearance
Waveform amplitude fluctuates
excessively (this is no problem ifAxle hub eccentric or with large runout
Replace hub
the minimum amplitude is
100 mV
or more)
Noisy or disturbed waveformOpen circuit in sensor
Open circuit in harness
Incorrectly mounted wheel speed sensor
Rotor with missing or damaged teethReplace sensor
Correct harness
Mount correctly
Replace rotor
NOTEThe wheel speed sensor cable moves following motion of the front or rear suspension. Therefore, it is likely that it has an
open circuit only when driving on rough roads and it functions normally on ordinary roads. It is, therefore, recommended
to observe sensor output voltage waveform also under special conditions, such as rough road driving,
(ME!991 377)12FOO5i
INSPECTION OF HYDRAULIC UNITINSPECTION BY FEEL
(I) Jack up the vehicle and support the vehicle with rigid racks
placed at the specified jack-up points.
(2) Release the parking brake and determine the drag force
(drag torque) of each wheel by feel.
LJ(3) Set the MUT through the adapter harness (MB991377) as
illustrated.
(4) After confirming that the shift lever or selector lever is in
the neutral position, start the engine.
The ABS warning light lights up, it goes into the MUT mode.
In the MUT mode, ABS does not function.
(5) Operate the MUT to force the actuator to operate (item No.
04, 05, 06).
(6) Turning the wheel manually, check the change of the
braking force when the brake pedal is depressed.
The change should be as shown in the following illustration.
NOTEWhile the ABS is in the fail safe mode, the MUT actuator
test cannot be made.
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