Subaru SVX 1992 Manual page 494

3- 2 [W3B3] AUTOMATIC TRANSMISSION AND DIFFERENTIAL
3. EVALUATION
Stall speed
Position Cause
(at sea level)
Throttle valve not
fully open
Less than specifics-
Erroneous engine
tio ns
. D, R, 2
operation
0 Torque convert-
er's one-way
clutch slipping
Line pressure too
low
Forward clutch
slipping
D only
One-way clutch
(1 - 2) malfunc-
tioning
One-way clutch
(3-4) malfunction-
ing
Line pressure too
low
Greater than specifi-
* Reverse clutch
cations
R only
slipping
Low & reverse
brake slipping
Line pressure too
low
2 only
Forward clutch
slipping
Brake band slip-
ping
Line pressure too
R, D, 2 low
ATF insufficient
C: TIME LAG TEST
1 . GENERAL
If the selector lever is shifted while the engine is idling,
there will be a certain time elapse or lag before the
shock can be felt. This is used for checking the condition
of the forward clutch, reverse clutch, low Er reverse
brake, forward one-way clutch and low one-way clutch .
CAUTION :
(a) Perform the test at normal operation fluid temper-
ature (60 to 80°C or 140 to 176°F) .
(b) Be sure to allow a one minute interval between
tests.
(c) Make three measurements and take the average
value .
2. TEST METHODS
1) Fully apply the parking brake.
2) Start the engine .
Check idling speed (A/C OFF)
"N" range : 610± 100 rpm
3) Shift the selector lever from "N" to "D" range .
Using a stop watch, measure the time it takes from
shifting the lever until the shock is felt .
Time lag : Less than 1 .2 seconds
4) In same manner, measure the time lag for "N"
R .
Time lag : Less than 1 .5 seconds
3. EVALUATION
1) If "N" - "D" time lag is longer than specified :
Line pressure too low
Forward clutch worn
Low one-way clutch not operating properly
2) If "N" -> "R" time lag is longer than specified :
Line pressure too low
Reverse clutch worn
" Low Et Rev. brake worn
Forward one-way clutch not operating properly
D: LINE PRESSURE TEST
1 . GENERAL
If the clutch or the brake band shows a sign of slippage
or shifting sensation is not correct, the line pressure
should be checked .
" Excessive shocks during upshifting or shifting takes
place at a higher point than under normal circum-
stances, may be due to the line pressure being too
high.
" Slippage or inability to operate the car may, in most
cases, be due to loss of oil pressure for the operation
of the clutch, brake band or control valve.
1) Line pressure measurement (under no load)
a. Before measuring line pressure, jack-up front
wheels (front-wheel-drive model) or all wheels (4-
wheel drive model) .
b. Maintain temperature of ATF at approximately 60
to 80°C (140 to 176°F) during measurement .
(ATF will reach the above temperature after idling the
engine for approximately 30 minutes with shift lever in
N,, or P
.)
2) Line pressure measurement (under heavy load)
a. Before measuring line pressure, apply both foot and
parking brakes with all wheels chocked (Same as for
"stall" test conditions).
b. Measure line pressure when selector lever is in "R",
"D", "2" and "1" with engine under stall conditions .
c. Measure line pressure within 5 seconds after shift-
ing the selector lever to each position . (If line pressure
needs to be measured again, allow the engine to idle
and then stop. Wait for at least one minute before
measurement.)
d. Maintain the temperature of ATF at approximately
60 to 80°C (140 to 176°F) during measurement. (ATF
will reach the above temperature after idling the en-
gine for approximately 30 minutes with the selector
lever in "N" or "P".)
2 . TEST METHODS
1) Temporarily attach the OIL PRESSURE GAUGE
ASSY (498575400) to a suitable place in the driver's
compartment.
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