Jeep Wrangler 1997 Manual - page 990
(5) Line pressure should be 54-60 psi (372-414
kPa) with throttle lever forward and gradually
increase as lever is moved rearward.
(6) Front servo is pressurized only in D range and
should be same as line pressure within 3 psi (21 kPa)
up to downshift point.
Test Four - Transmission In Reverse
This test checks pump output, pressure regulation
and the front clutch and rear servo circuits. Use 300
psi Test Gauge C-3293-SP for this test.
(1) Connect 300 psi gauge to rear servo port (Fig.
6) and (Fig. 7).
(2) Start and run engine at 1600 rpm for test.
(3) Move valve body selector lever four detents
rearward from the full forward position. This is
Reverse range.
(4) Move throttle lever all way forward then all
way rearward and note gauge readings.
(5) Pressure should be 145 - 175 psi (1000-1207
kPa) with lever forward and increase to 230 - 280 psi
(1586-1931 kPa) as lever is moved rearward.
Test Five - Governor Pressure
This test checks governor operation by measuring
governor pressure response to changes in engine
speed. It is usually not necessary to check governor
operation unless shift speeds are incorrect or if the
transmission will not downshift.
(1) Connect 100 psi Test Gauge C-3292 to governor
pressure port (Fig. 6) and (Fig. 7).
(2) Move shift lever to D range.
(3) Start and run engine at curb idle speed and
note pressure. At idle and with vehicle stopped, pres-
sure should be zero to 1.5 psi maximum. If pressure
exceeds this figure, governor valve or weights are
sticking open.
(4) Slowly increase engine speed and observe
speedometer and pressure test gauge. Governor pres-
sure should increase in proportion to vehicle speed.
(5) Pressure rise should be smooth and drop back
to 0 to 1.5 psi when wheels stop rotating.
(6) Compare results of pressure tests with analysis
charts (Fig. 9).
CONVERTER STALL TEST
Stall
testing
involves
determining
maximum
engine speed obtainable at full throttle with the rear
wheels locked and the transmission in D range. This
test checks the holding ability of the converter over-
running and transmission clutches.
WARNING:
NEVER ALLOW ANYONE TO STAND
DIRECTLY IN LINE WITH THE VEHICLE FRONT OR
REAR DURING A STALL TEST. ALWAYS BLOCK
THE WHEELS AND FULLY APPLY THE SERVICE
AND PARKING BRAKES DURING THE TEST.
STALL TEST PROCEDURE
(1) Connect tachometer to engine. Position tachom-
eter so it can be viewed from driver’s seat.
(2) Drive vehicle to bring transmission fluid up to
normal operating temperature. Vehicle can be driven
on road or on chassis dynamometer, if available.
(3) Check transmission fluid level. Add fluid if nec-
essary.
(4) Block front wheels.
(5) Fully apply service and parking brakes.
(6) Open throttle completely and record maximum
engine speed registered on tachometer. It takes 4-10
seconds to reach max rpm. Once max rpm has
been achieved, do not hold wide open throttle
for more than 4-5 seconds.
CAUTION:
Stalling the converter causes a rapid
increase in fluid temperature. To avoid fluid over-
heating, hold the engine at maximum rpm for no
more than 5 seconds. If engine exceeds 2500 rpm
during the test, release the accelerator pedal imme-
diately; transmission clutch slippage is occurring.
Fig. 9 Pressure Test Analysis
21 - 84
TRANSMISSION AND TRANSFER CASE
TJ
DIAGNOSIS AND TESTING (Continued)