1990 MITSUBISHI SPYDER Service Repair Manual

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Page 1169 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual AUTOMATIC TRANSAXLE
ENGINE (NON-TURBO)>
AUTOMATIC TRANSAXLE CONTROL COMPONENT LAYOUT
Output speed sensorTransaxle
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Page 1170 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual AUTOMATIC TRANSAXLE
ENGINE (NON-TURBO)> On-vehicle Service
Transaxle range sensor.(with built-in oil temperature sensor)
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Page 1171 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual AUTOMATIC TRANSAXLE
ENGINE (NON-TURBO)>: On-vehicle _ _
AUTOMATIC
COMPONENT CHECK
SPEED SENSOR
(1) Disconnect the input speed sensor connector.
(2) Measure the resistance
the inp

Page 1172 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual AUTOMATIC TRANSAXLE
ENGINE (NON-TURBO)> On-vehicle Service
0
I
(1) Remove the EATX relay.
(2) Check the continuity between the EATX relay terminals
4 and 6.
(3) Use jumper lea

Page 1173 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual AUTOMATIC TRANSAXLE.
ENGINE (NON-TURBO)>
(1) Disconnect the solenoid and assembly
(2) Measure the resistance between’ the solenoid and
pressure switch assembly side ‘connector term

Page 1174 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual AUTOMATIC TRANSAXLE
ENGINE (NON-TURBO)> On-vehicle Service
TORQUE CONVERTER STALL TESTING
The torque converter stall test is used primarily to determine
overrunning clutch operati

AUTOMATIC TRANSAXLE
ENGINE (NON-TURBO)> On-vehicle Service
TORQUE CONVERTER STALL TESTING
The torque converter stall test is used primarily to determine
overrunning clutch operation.
Use the scan tool and a tachometer to
test.
Determine engine rpm with the transaxle in
at wide open throttle, and vehicle
To keep the vehicle stationary and to avoid creepin g or lurching
forward, apply both the service brakes and the parking brake.
WARNING
When performing a stall test, always apply both the ser-
vice brakes and parking brake. Also, do not let any one
stand in front of the vehicle during
NOTE
Avoid keeping the throttle open for more than 5 seconds
at a time. Allow the transmission fluid to cool
tests by placing the transaxle in neutral, raising the
rpm slightly for approximately 20 seconds.
TORQUE CONVERTER CLUTCH FAILURE
One type of over-running clutch failure is a slipping
clutch. With this type of failure, the will exhibit normal
transaxle operation at highway speeds will have poor
acceleration.
Another type of over-running clutch failure is a seized
clutch.
With this type of failure, the vehicle acceleration may be ac-
ceptable but a high throttle is required to maintai n vehicle
speed.
The vehicle may seem like it has a loss of power.
With either type of failure, poor fuel economy and transaxle
fluid over-hearting may be the result.
STALL SPEED ABOVE SPECIFICATION
If the stall speed exceeds 2,440 by more than 200
a clutch is slipping.
Diagnose the clutch circuits by performing hydrauli c and air
pressure tests.
The clutches of the transaxles may also be checked
using information given through the input and outpu t speed
sensors to the TCM.
STALL SPEED BELOW SPECIFICATION
If stall speed is below specification, the
over-running clutch is slipping. During the road te st, if poor
acceleration occurs through the gears with normal t ransaxle
operation at highway speeds, the vehicle has a slip ping
clutch.
NORMAL STALL SPEED AND ACCELERATION
If stall speed and acceleration appear normal, but it takes
excessively high throttle opening to maintain vehic le speed,
the starter’s over-running clutch is seized.
This will impede the flow of fluid within the torqu e converter,
causing excessive use of power from the engine for cruising.
CONVERTER NOISE
While performing the stall test, listen for abnormal noise com-
ing from the converter area.
A whining noise due to fluid flow within the conver ter is consid-
ered normal.
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Page 1175 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual AUTOMATIC TRANSAXLE. .
ENGINE Service
Loud metallic noises coming from indicate loose
parts or internal damage. Remove the
from
the
area and check for a cracked torque con

Page 1176 of 2103

MITSUBISHI SPYDER 1990 Service Repair Manual AUTOMATIC TRANSAXLE
ENGINE On-vehicle Service
Accumulators
CLUTCH AIR PRESSURE TESTS
Inoperative clutches can be located using a series of tests
by substituting air pressure for

AUTOMATIC TRANSAXLE
ENGINE On-vehicle Service
Accumulators
CLUTCH AIR PRESSURE TESTS
Inoperative clutches can be located using a series of tests
by substituting air pressure for fluid pressure.
The clutches may be tested by applying air pressure to their
respective passages.
Remove the valve body and then install the special tool
To make air pressure tests, go on as follows:
The compressed air supply must be free of all dirt and moisture.
Use a pressure of 207 (30 psi).
Remove oil pan and valve body. See Valve body remov al.
OVERDRIVE CLUTCH
Apply air pressure to the overdrive clutch apply passage and
watch for the push/pull piston to move forward. The piston
should return to its starting position when the air pressure
is removed.
REVERSE CLUTCH
Apply air pressure to the reverse clutch apply pass age and
watch for the push/pull piston to move rearward. Th e piston
should return to its starting position when the air pressure
is removed.
CLUTCH
Apply air pressure to the feed hole located on the clutch
retainer.Look in the area where the piston contacts
the first separator plate and watch carefully for the piston
to move rearward. The piston should return to its o riginal
position after the air pressure is removed.
LOW/REVERSE CLUTCH
Apply air pressure to the low/reverse clutch feed h ole (rear
of case, between 2 bolt holes). Then, look in the a rea where
the low/reverse piston contacts the first separator plate and
watch carefully for the piston to move forward. The piston
should return to its original position after the ai r pressure
is removed.
CLUTCH
Because this clutch piston cannot be seen, its oper ation is
checked by function. Air pressure is applied to low/ reverse
and the clutches. This locks the output shaft. Use a
piece of rubber hose wrapped around the input shaft and
a pair of clamp-on pliers to turn the input shaft. Next apply
air pressure to the underdrive clutch. The input sh aft should
not rotate with hand torque. Release the air pressu re and
confirm that the input shaft will rotate.
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