1991 MITSUBISHI 3000GT Service Manual

AUTOMATIC TRANSAXLE - Troubleshooting23-45Symptom
Probable cause
RemedyRef. page
Selector lever cannot
be shifted from
R to P.Defective selector lever assembly
Check and replace selector23-54
lever assembly.
Improperly adjusted transaxle control cable
Adjust transaxle control
23-56
cable.Ignition key cannot
Foreign matter wedged in lock cams A and B
23-58
be turned to LOCKCheck and replace lock cams
A and B.
position with selector
lever in
P.Improperly adjusted key interlock cable,
sticking inner cableCheck, adjust, and replace213-55key interlock cable.
Binding slide lever inside key cylinder
Check slide lever.
23-55
Ignition key can be
Damaged lock cam A
Check and replace lock cam A.
2:3-58turned to LOCK
position even withLoose key cylinder cover
Check and retighten cover.
2:3-55selector lever in
position other than P.
Broken key interlock cable, loose connec-
Check and replace key
2355tions, elongated inner cable
interlock cable.
Damaged cam lever inside key cylinder
Check and replace cam lever.
2:3-55Buzzer does not soundDefective buzzer
Check and replace buzzer.
2:3-55even when selector
lever is placed in
ROpen-circuited buzzer circuit harness
Check or correct harness.-position.
Defective inhibitor switchCheck and replace inhibitor
-switch.
Improperly adjusted transaxle control cableAdjust transaxle control
2:3-52
cable.
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23-46AUTOMATIC TRANSAXLE - Service Adjustment Procedures
Fluid level must be
within this range.
TFA038:
SERVICE ADJUSTMENT PROCEDURE!5
MZ3FElBJ
TRANSMISSION FLUID LEVEL INSPECTION
1.Drive until the fluid temperature reaches the usual tempera-
ture
170 - 80°C (160 - 18O”F)].2. Place vehicle on level floor.
3. Move selector lever sequentially to every position to fill
torque converter and hydraulic circuit with fluid, then place
lever in “N” Neutral position.
4. Before removing dipstick, wipe all dirt from area
arouniddipstick. Then take out the dipstick and check the condition
of the fluid.
The transaxle should be overhauled under the following
conditions.
’ l If there is a “burning” odor.
l If the fluid color has become noticeably blacker.
lIf there is a noticeably great amount of metal particles in
the fluid.
5.Check to see if fluid level is in “HOT” range on dipstick. If
fluid level is low, add automatic transmission fluid until level
reaches “HOT” range.
Transmission fluid: MITSUBISHI PLUS ATF/Automatictransmission fluid “DEXRON”
abr“DEXRON II”
Low fluid level can cause a variety of conditions because it
allows pump to take in air along with fluid. Air trapped in
hydraulic circuit forms bubbles which make fluid spongy.
Therefore, pressures will be erratic, causing delayed shift,
slippy clutch and brakes, etc.
Improper filling can also raise fluid level too high. When
transaxle has too much fluid, gears churn up foam
anldcause the same conditions which occur with low fluid level,
resulting in accelerated deterioration of automatic
transaxllefluid.
In either case, air bubbles can cause overheating, fluid
oxidation, which can interfere with normal valve, clutch, and
servo operation. Foaming can also result in fluid escaping
from transaxle vent where it may be mistaken for a leak.
6. Be sure to examine fluid on dipstick closely.
TRANSMISSION FLUID REPLACEMENTM23FCBHRefer to GROUP 00
- Maintenance Service.
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AUTOMATIC TRANSAXLE - Service Adjustment Procedures23-47
MD998916-3-01
KICKDOWN SERVO ADJUSTMENTM23FRAC(1) Remove dust, dirt, and other contaminants completely fromkickdown (K/D) servo cover and surrounding areas.
(2) Snap off the snap ring and remove K/D servo switch.
(3) Fit claw of special tool into cutout in piston to prevent
piston from turning and use adapter to fix the piston into
position.
Caution
1. Do not push piston with the special tool.
2.Secure adapter only hand-tight to L/R brake press-
ure take-up port and do not apply
excessiwe torque.
(4) Loosen lock nut to immediately before V-groove in adjust
rod (see illustration on left) and tighten special tool (Inner
Wrench) until it contacts lock nut.
(5) Fit special tool (Outer Wrench) over the lock nut. Turn Outer
Wrench counterclockwise and turn inner cylinder clockwise
to lock the lock nut and special tool (Inner Wrench).
(6) Fit torque wrench to special tool (Inner Wrench) and repeat
tightening and loosening cycle two times with a torque of
10 Nm (7.2 ft.lbs.). Then, torque to 5 Nm (3.6 ftlbs.).Next, back off special tool (Inner Wrench) 2 to
2’/4 turns.
(7) Fit special tool (Outer Wrench) to lock nut.
Turn Outer Wrench clockwise and Inner Wrench counter-
clockwise to unlock the lock nut from special tool (Inner
Wrench).
Caution
Be sure to apply even torque to the two special tools
when unlocking.
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23-48AUTOMATIC TRANSAXLE - Service Adjustment Procedures
Adjusting screw4
or~0\====m00~7/IIIITFAm
c-1
Pi(8) Tighten lock nut by hand until it contacts piston. Then, using
torque wrench, tighten to specification.
Lock nut: 29 Nm (21
ftlbs.)Caution
Use of socket wrench or torque wrench could result in
lock nut being turned with adjust rod.
(9) Remove the special tool to secure the piston and torque
plug to specification at L/R brake pressure take-up port.
LINE PRESSURE ADJUSTMENT
(I) Discharge AFT.
(2) Remove oil pan.
(3) Remove oil filter.
(4) Remove oil temperature sensor.
M23FSAC(5) Press solenoid valve harness grommet catch to push in
grommet; then, remove valve body assembly.
Caution
Do not let manual valve fall.
(6) Turn adjusting screw of regulator valve to obtain the
specified line pressure
(K/D brake pressure).
Standard value:870
- 890 kPa (124 - 127 psi)
Oil pressure change for
each turn of adjustment screw:38
kPa (54 psi)
(7)Check that an O-ring is fitted at the location shown on top off
valve body.
(8) Replace O-ring of solenoid valve intermediate grommet
with a new one and then fit the O-ring into case.6
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AUTOMATIC TRANSAXLE - Service Adjustment Procedures23-49
1(9) Install valve body and oil temperature sensor.
Bolt A
= Length 18 mm (.709 in.)
Bolt B
= Length 25 mm (.984 in.)
Bolt C
= Length 40 mm (1.575 in.)
CautionSecure solenoid valve and oil temperature sensor
harness at locations shown.
(1O)lnstall oil filter.(1l)lnstall new oil pan gasket and oil pan.
(12)Add the specified amount of ATF.
(13)Carry out hydraulic test.
Readjust as necessary.
REDUCING PRESSURE ADJUSTMENTh323FfADWhen multi-use tester is not used
(1) Following the same steps as those in line pressure
adjustment, remove parts up to oil filter.
There is no need to remove valve body.
(2) Turn adjusting screw of lower valve body to obtain the
specified reducing pressure. Turn it counterclockwise to
increase the pressure.
Standard value:425 f 10 kPa (60 f 1 psi)
Oil pressure change for
each turn of adjusting screw:45 kPa (6 psi)(3) In the same way as in line pressure adjustment,
/nstall oil
filter and oil pan.
(4) Perform hydraulic test.
Adjust as necessary.
When multi-use tester is used
(1) Adjust to obtain the specified K/D brake pressure when PC
solenoid is energized at duty 50% with the multi-use tester.
Standard value:275 kPa (39 psi)
Oil pressure change for
each turn of adjusting screw:50 kPa (7 psi)(2) After adjustment has been made, check that the recuding
pressure is in the range 360
- 480 kPa (51 - 68 psi).
Caution
This adjustment should be made with oil temperature70
- 80°C (160 - 180°F).
The adjustment made with high oil temperature couldresult in improper adjustment due to a line pressure
drop at idle.
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23-50AUTOMATIC TRANSAXLE - service AdiustmentProcedures
09FO117
m09FOO19
L Pushbuttonv09FOO61
@ Button pressed (while brakepedal is depressed)c Button not pressed@ Button pressed
/\ \\ OSFODdACCELERATOR SWITCH INSPECTION AND
ADJUSTMENTM23FZAACheck that current flows between terminals of accelerator
switch when accelerator pedal is in free state and that no
dcurrent flows when the pedal is depressed and the specified
stroke A is obtained.
Standard value: 2
- 6 mm (.079 - .24 in.)
‘If stroke A is out of specification, adjust with adjusting bolt.
SELECTOR LEVER OPERATION CHECKM23FIAG
1.. Shift selector lever to each range and check that lever
moves smoothly and is controlled. Check that position
indicator is correct.
2.Check to be sure the selector lever can be shifted to each
position (by button operation as shown in the illustration).
3. Start the engine and check if the vehicle moves forward
dwhen the selector lever is shifted from N to
D, and moves
backward when shifted to R.
4.When the shift lever malfunctions, adjust control cable and
selector lever sleeve. Check for worn shift lever assembly
sliding parts.
I
NOTETo move the selector lever from the “P” position to any
other position, first turn the ignition key to any position
other than “LOCK” and depress the brake pedal.
KEY INTERLOCK MECHANISM CHECKM23FlJACCompletely stop the vehicle and switch OFF the engine before
making the check
1.Check to be sure that, under the following conditions, the
selector lever cannot be moved from the “P” position to
any other position.
Also check, at the same time, that the button cannot be
pressed.
Ignition key position: “LOCK” or removed
Brake pedal: Depressed
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AUTOMATIC TRANSAXLE - Service Adiustment Procedures23-51
D9N007SPush button
II
2.Check to be sure that, under the following conditions, the
selector lever can be moved from the “P” position to any
other position.
Press the button a few times and check to be sure that the
selector lever moves smoothly.
Ignition key position: “ACC”
Brake pedal: Depressed
Button
: Pressed
3.Check to be sure that, at all positions of the selector lever
(other than “P”), the ignition key cannot be turned to the
“LOCK” position.
Check to be sure that the ignition key smoothly turns to the
“LOCK” position when the selector lever is then set to the
“P” position and the button is released.
4. If above are not checked okay, adjust key interlock cable
mechanism as follows.
(1) Remove front console assembly.
(2) Place selector lever into “P” position.
(3) Turn ignition key to the “LOCK” position.
(4) Loosen nut that secures key interlock cable.
(5) Lightly pressing lock cam A in the direction of arrow,
lightly push key interlock cable to take up slack and
tighten nut to secure key interlock cable.
(6) Reinstall front console assembly.
SHIFT LOCK MECHANISM CHECKMZ3FVAC
1.
2.
3.
4.Check to be sure that, under the following
condi,tions, the
selector lever cannot be moved from the “P” position to
any other position.
Ignition key position: “ACC”
Brake pedal: Not depressed
Button: PressedCheck to be sure that, under the following conditions, the
selector lever can be moved smoothly from the “P”
position to other position.
Ignition key position: “ACC”
Brake pedal : Depressed
Button: PressedCheck to be sure that, under the following conditions, the
selector lever can be moved smoothly from the “R”
position to the “P” position.
Ignition key position: “ACC”
Brake pedal: Released
Button: PressedIf a malfunction is discovered when following the above
checking procedures, either adjust or check the shift lock
cable mechanism. (Refer to
P.23-56.)
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23-52
AUTOMATIC TRANSAXLE - Service Adjustment Procedures
Manual
control leverINHIBITOR SWITCH AND CONTROL CABLE
ADJUSTMENTM23FJADI1. Place selector lever in “N” (Neutral) position.
2. Place manual control lever in “N” (Neutral) position.
d3.For adjustment, turn inhibitor switch body so that the end
(section A-A in illustration on left) of manual control lever is
aligned with the hole In inhibitor switch body flange.
4. Tighten the mounting bolts of the inhibitor switch body to
the specified torque. At this time, take care to prevent
dropping the switch body.
TFA0359Mounting bolt
Section A-AManual
control
ISwitch
body
09N0062Oil
skal
1
v0 o\l II 0 // 0*-
I I09K567
09K566Specified torque:
10 - 12 Nm (7 - 9 ftlbs.)
5.Loosen the nut shown in the figure, and lightly pull the end
of the transaxle control cable in the direction of arrow by
hand.6. Tighten the nut to the specified torque.
Specified torque: 13 Nm (9
ftlbs.)7. Check that the selector lever is in “N” position.
8. Check that it securely operates and functions on the
transaxle side in the range which corresponds to each
position of the selector lever.
d
DRIVE SHAFT OIL SEALS REPLACEMENTM23FLN3D(1) Disconnect the drive shaft from the transaxle.
(Refer to GROUP 26
- Drive Shaft.)
(2) Using-.a flat-tip (-) screwdriver, remove the oil seal.
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