Diagnosis And Test Procedures; Preliminary Diagnosis; Fluid Level And Condition; Vehicle Is Driveable - Jeep J-10 Series 1982 Technical & Service Manual

AUTOMATIC TRANSMISSION 2C-11
DIAGNOSIS AND TEST
PROCEDURES
GENERAL
Page
Air Pressure Test 2C-15
Converter Housing RbM Leak Diagnosis
2C-16
Fluid Level and Condition
2C-11
Rushing QD Cooler aid Uses
2C-12
QearsBtft Linkage
2C-12
Genera! 2C-11
Governor
2C-17
Automatic transmission malfunctions are usually the
result of poor engine performance, incorrect fluid level,
incorrect linkage, band or hydraulic control pressure
adjustments, hydraulic system malfunctions or me
chanical component malfunctions.
In all automatic transmission repair, the logical and
proper procedure is diagnosis before disassembly. A sys
tematic diagnosis procedure is important in avoiding
repair delays caused by incorrect or unnecessary re
pairs. The diagnosis and test procedures outlined in this
section should be performed in the following sequence to
realize maximum effect: (1) preliminary diagnosis, (2)
road test, (3) hydraulic pressure test, (4) air pressure
test, (5) stall test, (6) analyze test results and consult
diagnosis guides and charts for cause of malfunction.
PRELIMINARY DIAGNOSIS
Two basic procedures are required. One procedure for
vehicles that are driveable and an alternate procedure
for vehicles that will not back up or move forward.
Vehicle Is Driveable
(1) Check fluid level and condition.
(2) Adjust throttle and gearshift linkage before
road testing if complaint was based on delayed, erratic,
or harsh shifts.
. (3) Perform stall test if complaint was based on
sluggish, low-speed acceleration or abnormal throttle
opening requirements to maintain highway speeds with
engine in good tune.
(4) Road test vehicle and analyze results.
(5) Perform hydraulic pressure tests.
(6) Perform air pressure test to check clutch and
band operation.
Vehicle Will Not Back Up or Move Forward
(1) Check fluid level and condition.
(2) Check for broken or disconnected throttle
linkage.
(3) Check for broken cooler lines and loose or miss
ing pressure port plugs.
Page
HydriBllc Pressure Tests
2C-13
Preliminary Diagnosis
2C-11
Road Test 2C-12
Sendee Diagnosis
2C-17
Specifications
2C-21
Stall Test 2C-17
Throttle Linkage
2C-12
(4) Raise vehicle, start engine, shift transmission
into gear and note following:
(a) If propeller shafts turn but wheels do not,
problem is in differential or axle shafts.
(b) If propeller shafts do not turn and transmis
sion is noisy, stop engine, remove oil pan, and check for
debris. If debris is not found, remove transmission and
check for broken drive plate or drive plate-to-converter
bolts, broken converter hub, broken input or output
shaft or broken oil pump.
(c) If propeller shafts do not turn and transmis
sion is not noisy, perform hydraulic pressure test to
determine if problem is malfunction of hydraulic or
mechanical component.
FLUID LEVEL AND CONDITION
Check fluid level and condition as follows:
(1) Drive vehicle until transmission fluid is at nor
mal operating temperature of approximately 175°F
(79.4°C).
NOTE: To avoid false readings, which could result in
an over or under-fill condition, do not check the fluid
level until the fluid is at operating temperature.
(2) Shift transmission into Neutral.
NOTE: The transmission fluid level is checked in Neu
tral because the converter fills more rapidly in this
position.
(3) Apply parking brake.
(4) Operate engine at idle speed.
(5) Wipe dirt from filler cap and tube before remov
ing dipstick.
WARNING: Be sure to keep hands or loose articles of
clothing away from the fan, accessory drive belts, or
other rotating engine parts. Contact with these com
ponents or hot engine components can result in personal
injury.
(6) Remove dipstick and check fluid level. Fluid
level is correct when between ADD ONE PINT and
FULL marks on dipstick.