Hyundai Sonata 1991 Shop Manual page 425

CONVERTER STALL TEST
GENERAL
Y45CV1A
Stall test consists of determining maximum engine speed
obtained at full throttle in "0" and "R" positions. This test checks
torque converter stator overrunning clutch operation, and
holding ability of the transaxle clutches and the low-reverse
brake.
Warning:
During this test, make sure that no one stands in front of or
behind vehicle.
1. Check transaxle fluid level. Fluid should be at normal
operating temperature [70-80 0 C (160-180
0
F)]. Engine
coolant should also be at normal operating temperature
[80-90
0
C (1 80-1 90° F)].
2. Apply chocks to both rear wheels.
3. Attach engine tachometer.
4. Apply parking and service brakes fully.
5. Start engine.
6. With selector lever in "0" position, depress accelerator pedal
fully to read engine maximum rpm. Do not hold throttle wide
open any longer than is necessary to obtain maximum
engine rpm reading, and never longer than 5 seconds at a
time. If more than one stall test is required, operate engine
at approximately
1,000
rpm in neutral for 2 minutes to cool
transaxle fluid between test.
Stall speed: 2,200 ± 200 rpm
7. Place selector lever to "R" position and perform stall test by
the same procedure as in foregoing item.
Stall Speed Above Specification in "0"
If stall speed is higher than specification, rear clutch or
overrunning clutch of transaxle is slipping. Perform hydraulic
test.
Stall Speed Above Specification in "R"
If stall speed is higher than specification, front clutch of transaxle
or the low-reverse brake is slipping. Perform .hydraulic test.
Stall Speed Below Specification in "0" and "R"
If stall speed is lower than specification, insufficient engine
output or a faulty torque converter is suspected. Check for engine
misfiring, ignition timing, valve clearance etc. If these are good,
torque converter is faulty.
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