Jeep XJ. Manual — part 427
CONDITION
POSSIBLE CAUSE
CORRECTION
DRAG OR BIND ON 1-2, 2-3 OR
3-4 UP-SHIFT
Shift cable out of adjustment
Adjust cable
Valve body faulty
Repair valve body
Transimssion faulty
Disassemble and repair
transmission
CONVERTER CLUTCH DOES NOT
ENGAGE IN 2ND, 3RD OR 4TH
Electronic control problem
Check with DRB Tester
Valve body faulty
Repair valve body
Solenoid faulty
Replace solenoid
Transmission faulty
Disassemble and repair
transmission
HARSH DOWN-SHIFT
Throttle cable out of adjustment
Adjust cable
Throttle cable and cam faulty
Replace cable and cam
Accumulator pistons faulty
Repair pistons
Valve body faulty
Repair valve body
Transmission faulty
Disassemble and repair
transmission
NO DOWN-SHIFT WHEN
COASTING
Valve body faulty
Repair valve body
Solenoid faulty
Replace solenoid
Electronic control problem
Locate problem with DRB Tester
DOWN-SHIFT LATE OR EARLY
DURING COAST
Throttle cable faulty
Replace cable
Valve body faulty
Repair valve body
Transmission faulty
Disassembly and repair
transmission
Solenoid faulty
Replace solenoid
Electronic control problem
Locate problem with DRB Tester
NO 4-3, 3-2 OR 2-1 KICKDOWN
Solenoid faulty
Replace solenoid
Electronic control problem
Locate problem with DRB Tester
Valve body faulty
Repair valve body
NO ENGINE BRAKING IN 1-2
POSITION
Solenoid faulty
Replace solenoid
Electronic control problem
Locate problem with DRB Tester
Valve body faulty
Repair valve body
Transmission faulty
Disassemble and repair
transmission
VEHICLE DOES NOT HOLD IN
PARK
Shift cable out of adjustment
Adjust cable
Parking lock pawl cam and spring
faulty
Replace cam and spring
OVERHEAT DURING NORMAL
OPERATION (FLUID
DISCOLORED, SMELLS BURNED)
Low fluid level
Add fluid and check for leaks
Fluid cooler, lines blocked, or cooler
cracked (oil in engine coolant)
Flush cooler and lines and replace
radiator if transmission fluid has
entered coolant
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AW–4 AUTOMATIC TRANSMISSION
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DIAGNOSIS AND TESTING (Continued)
CONDITION
POSSIBLE CAUSE
CORRECTION
OVERHEAT DURING
COMMERCIAL OPERATION OR
WHILE TRAILE TOWING (FLUID
DARK AND BURNED WITH SOME
SLUDGE FORMATION)
Vehicle not properly equipped for
trailer towing or commercial use
Be sure vehicle is equipped with
recommended optional components
(i.e. HD springs, transmission, axle,
larger CID engine, auxiliary cooler,
correct axle ratio, etc.). If vehicle is
not so equipped, it should not be
used for severe service operation
Vehicle not equipped with auxiliary
fluid cooler
Drain fluid, change filter, and install
auxiliary cooler
Extensive idling time or operation in
heavy traffic in hot weather
Cut down on idling time; shift into
neutral every so often and run
engine at 1000 rpm to help circulate
fluid through cooler
Tow vehicle overloaded (exceeding
vehicle tow capacity
Be sure vehicle is properly equipped
to handle load; do not tow Class
III-type loads with a vehicle that is
only rated for Class I or II operation
Air flow to auxiliary cooler blocked
by snow plow, front mounted spare
tire, bug screen, or similar item
Remove or reposition item causing
air flow blockage
OIL COMES OUT FILLER TUBE
Transmission overfilled
Drain fluid to correct level; remove
neutral switch and drain through
switch hole with suction gun
Breather vent in oil pump blocked
Inspect and clear blockage
Fluid cooler or cooler lines plugged
Flush cooler and lines
TRANSMISSION SOLENOID TESTING
Test solenoid resistance with an ohmmeter. Con-
nect the ohmmeter leads to the solenoid mounting
bracket and to the solenoid wire terminal (Fig. 40).
Solenoid resistance should be 11–15 ohms. Replace
the solenoid if resistance is above or below the spec-
ified range.
PARK/NEUTRAL POSITION SWITCH
SWITCH TESTING
Test switch continuity with an ohmmeter. Discon-
nect the switch and check continuity at the connector
terminal positions and in the gear ranges indicated
in Figure 3. Switch continuity should be as follows:
• Continuity should exist between terminals B
and C with the transmission in Park and Neutral
only (Fig. 41).
• Continuity should exist between terminals A and
E with the transmission in Reverse (Fig. 41).
• Continuity should exist between terminals A and
G with the transmission in third gear (Fig. 41).
• Continuity should exist between terminals A and
H with the transmission in first and/or second gear
(Fig. 41).
• Continuity should not exist in D position.
Fig. 40 Testing Transmission Valve Body Solenoid
1 – OHMMETER
2 – WIRE TERMINAL
3 – SOLENOID
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AW–4 AUTOMATIC TRANSMISSION
21 - 245
DIAGNOSIS AND TESTING (Continued)
GEARSHIFT CABLE
(1) The floor shifter lever and gate positions
should be in alignment with all transmission PARK,
NEUTRAL, and gear detent positions.
(2) Engine starts must be possible with floor shift
lever in PARK or NEUTRAL gate positions only.
Engine starts must not be possible in any other gear
position.
(3) With floor shift lever handle push-button not
depressed and lever in:
(a) PARK position—Apply forward force on cen-
ter of handle and remove pressure. Engine starts
must be possible.
(b) PARK position—Apply rearward force on cen-
ter of handle and remove pressure. Engine starts
must be possible.
(c) NEUTRAL position—Normal position. Engine
starts must be possible.
(d) NEUTRAL position—Engine
running
and
brakes applied, apply forward force on center of
shift handle. Transmission shall not be able to shift
from neutral to reverse.
THROTTLE VALVE CABLE
Transmission throttle valve cable adjustment is
extremely important to proper operation. This adjust-
ment positions the throttle valve, which controls shift
speed, quality, and part-throttle downshift sensitivity.
If cable setting is too loose, early shifts and slip-
page between shifts may occur. If the setting is too
tight, shifts may be delayed and part throttle down-
shifts may be very sensitive. Refer to the Adjust-
ments section for the proper adjustment procedure.
SPEED SENSOR TESTING
Test the speed sensor with an ohmmeter. Place the
ohmmeter leads on the terminals in the sensor con-
nector (Fig. 42).
Rotate the transmission output shaft and observe
the ohmmeter needle. The needle should deflect indi-
cating the switch is opening/closing as the rotor
moves past the sensor (Fig. 42). Replace the sensor if
the ohmmeter does not display any kind of reading.
If a digital ohmmeter is being used, the sensor
should generate an ohmmeter readout each time the
switch opens and closes.
FLOW TESTING TRANSMISSION MAIN
COOLER
Cooler flow is checked by measuring the amount of
fluid flow through the cooler in a 20 second time
period. The test is performed with the engine run-
ning and transmission in neutral. Fluid is then
pumped through the cooler by the transmission oil
pump.
(1) Disconnect cooler inlet line at transmission fit-
ting.
Fig. 41 Park/Neutral Position Switch Terminals And
Testing
Fig. 42 Speed Sensor Testing
1 – CONNECTOR
2 – OHMMETER
3 – SENSOR
4 – SENSOR SWITCH
5 – ROTOR
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AW–4 AUTOMATIC TRANSMISSION
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DIAGNOSIS AND TESTING (Continued)
(2) Securely attach hose to end of inlet line and
position line in a one quart test container.
(3) Add extra quart of fluid to transmission.
(4) Use stopwatch to check flow test time.
(5) Shift transmission into neutral and set parking
brake.
(6) Start and run engine at curb idle speed and
immediately note cooler flow. Approximately one
quart of fluid should flow into test container in 20
second period.
(7) If cooler flow is intermittent, flows less than
one quart in 20 seconds, or does not flow at all,
cooler is faulty and must be replaced.
TORQUE CONVERTER STATOR CLUTCH
INSPECTION
(1) Insert Rotating Tool 7547 into converter hub
and seat tool in one–way clutch (Fig. 43).
(2) Insert Stopper Tool 7548 in one converter hub
notch and into outer race of rotating tool.
(3) Turn rotating tool clockwise. Converter clutch
should rotate freely and smoothly. Less than 2.5 N·m
(22 in. lbs.) of torque should be required to rotate
clutch in clockwise direction.
(4) Turn rotating tool in counterclockwise direc-
tion. Converter clutch should lock.
(5) Replace converter if clutch binds or will not
lock.
SERVICE PROCEDURES
CHECKING FLUID LEVEL
(1) Be sure transmission fluid is at normal operat-
ing temperature. Normal operating temperature is
reached after approximately 15 miles (25 km) of
operation.
(2) Position vehicle on level surface. This is impor-
tant for an accurate fluid level check.
(3) Shift transmission through all gear ranges and
back to Park.
(4) Apply parking brakes.
(5) Verify that transmission is in Park.
(6) Wipe off dipstick handle to prevent dirt from
entering fill tube. Then remove dipstick and check
fluid level and condition.
(7) Correct fluid level is to FULL mark on dip-
stick when fluid is at normal operating temper-
ature (Fig. 44).
(8) If fluid level is low, top off level with Mopar
Dexron IIE/Mercon. Mopar Dexron II can be used but
only if Mercon is not available. Do not overfill
transmission. Add only enough fluid to bring
level to Full mark.
(9) If too much fluid was added, excess amount can
be removed with suction gun and appropriate diame-
Fig. 43 Checking Operation Of Torque Converter
Stator One–Way Clutch
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AW–4 AUTOMATIC TRANSMISSION
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DIAGNOSIS AND TESTING (Continued)
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