ECU MITSUBISHI 3000GT 1991 Workshop Manual

23-22AUTOMATIC TRANSAXLE - Troubleshooting
0”
TM362
DIAGNOSIS AND TEST
FLUID LEVEL AND CONDITION
1.Drive until the fluid temperature reaches the usual tempera-
ture
[70 - 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. This operation is necessary to
be sure that fluid level check is accurate.
4. Before removing dipstick, wipe all dirt from area around
dipstick. 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 transaxle fluid until level
reaches “HOT” range.
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.
Improper filling can also raise fluid level too high. When
transaxle has too much fluid, gears churn up foam and
cause same conditions which occur with low fluid level,
resulting in accelerated deterioration of automatic transaxle
fluid.
dIn 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.
,CONTROL CABLEWhether control cable is properly adjusted can be confirmed by
checking whether inhibitor switch is performing well.
1. Apply parking brakes and service brakes securely.
2. Place selector lever to “R” range.
3. Set ignition key to “ST” position.
4. Slowly move the selector lever upward until it clicks as it
fits in notch of “P” range. If starter motor operates when
lever makes a click, “P” position is correct.
5.Then slowly move selector lever to “N” range by the same
procedure as in foregoing paragraph. If starter motor
operates when selector lever fits in
“N”, “N” position is
correct.
6. Also check to be sure the vehicle doesn’t begin to move
and the lever doesn’t stop between P-R-N-D.
7. The control cable is properly adjusted if, as described
above, the starter motor starts at both the “P” range and
the “N” range.
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23-26AUTOMATIC TRANSAXLE - Troubleshooting
Code
No.Display PatternItemRemedial Action
1 st speed shift not finishl Check connectors of pulse
generators A and
B.l Check pulse generators A and B on
bench.
l Rear clutch slipping
52
uuuuu-ln-2nd speed shift not finishl Check connectors of pulse
generators A and B.
l Check pulse generators A and B on
bench.
l Rear clutch slipping
533rd speed shift not finishl Kickdown brake slipping
l Check connectors of pulse
generators A and B.
4th speed shift not finishl Check pulse generators A and B on
bench.
l Front clutch slipping
l Rear clutch slipping
l Check connectors of pulse
generators A and B.
l Check pulse generators A and B on
bench.
l End clutch slipping
6162l Kickdown brake slipping
Short-circuited torque
reduction request signal linel Check torque reduction request
or open-circuited torquesignal line.
reduction execution signal linel Check torque reduction execution
signal line.
Open-circuited torque reduction
request signal line0 Check torque reduction request
signal line.
63Short-circuited torque
reduction execution signal linel Check torque reduction execution
signal line.
12A0106
‘J
\J
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AUTOMATIC TRANSAXLE - Troubleshooting
~I+~Pull the parking brake to
set it securely.
I
23-35With the engine idling, de-
press the foot brake firmly.
.
Set the selector
‘3” or “D” range.Stop theengine.Let the engine continue idling.
c .
INormalI
Improper adjustmentof idling
-Readjust1
Replace the damperclutch control
solenoid valve.
1 9$4nFv;itheclutch 1
1 f;w$aul the valve 1
Sticking (seizure) ofthe damDer clutch
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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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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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AUTOMATIC TRANSAXLE - Service Adjustment Procedures23-53 ~
(3) Using the special tool, tap the drive shaft oil seal into the
transaxle.
Note in illustration the direction of installation of drive shaft
oil seal.
(4) Apply a coating of the transaxle fluid to the lip of the oil seal.
Transaxle fluid: Dia ATF SP or MITSUBISHI PLUS ATFor equivalent
Transaxle
side
011 seal lip
2200037
-fSPEEDOMETER CABLE REPLACEMENTM23FEAL2
1.Correctly insert the adapter into the instrument panel, and
fasten the new speedometer cable.
I
OQFOO83
2.Install the grommet so that, as shown in the illustration, the
cable attachment part and the projecting part are horizontal.
Caution1
The cable arrangement should be made so that the
’radius of cable bends is 150 mm (5.9 in.) or more.
3.. At the transaxle end of the speedometer cable, the key joint
should be inserted into the transaxle, and the nut should be
securely tightened.
Caution
If the cable is not correctly and securely connected, it
may cause incorrect indication by the speedometer, orabnormal noise. Be sure to connect it correctly.
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AUTOMATIC TRANSAXLE - Transaxle Control23-57
09N0050Was
Nut
09N0049Was
Nut
0910046
I
-09FOlOt(5) Connect the shift lock cable to lock cam B and
temporarily tighten the nut.
At this time, install the spring and washer,
vvhich have
been fitted to the shift lock cable, as shown.
(6) Pressing the set lever to prevent lock cam B from
moving, lightly pull the shift lock cable to take up slack
and tighten the nut to secure the shift lock cable into
position.
NOTEMake sure that the shift lock cable end is in contact with
the fixing pin of lock cam B as shown, then install the
washer and snap pin.
(7) Connect the key interlock cable to lock cam A and
temporarily tighten the nut.
At,this time, install the spring and washer, vvhich have
been fitted to the key interlock cable, as shown.
(8) Lightly pressing lock cam A in the direction of arrow,
lightly push the key interlock cable to take up slack and
tighten the nut to secure the key interlock cable in
position.
(9) Turn the set lever and fit it onto the fixing pin on lock
cam A, then install the snap pin.
(lO)After the key interlock cable has been connected, check
the shift lock and key interlock mechanism. (Refer to
P.23-50.)
3. CONNECTION OF KEY INTERLOCK CABLE (SELECTOR
LEVER ASSEMBLY SIDE)(1) Place the selector lever into “P” position.
(2) Connect the key interlock cable to lock cam A and
temporarily tighten the nut.
At this time, install the spring and washer, which have
been fitted to the key interlock cable, as shown.
(3) Lightly pressing lock cam A in the direction of arrow,
lightly push the key interlock cable to take up slack and
tighten the nut to secure the key interlock cable in
position.
(4) Turn the set lever and fit it onto the fixing pin on lock
cam A, then install the snap pin.
(5) After the key interlock cable has been connected, check
the key interlock mechanism. (Refer to
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