Subaru 1600 Service Manual page 334

AUTOMATIC TRANSMISSION AND DIFFERENTIAL
2) Road Test
Road tests should be conducted to
properly diagnose the condition of the
automatic transmission.
I)
Speed change characteristics
The standard speed change charac-
teristics are indicated in the following
table.
2) Shift characteristics
Pay careful attention to ensure the
shift is made smoothly at the proper
car speed at which shifting begins.
I) Shifting shocks are encountered
or smooth shifting does not occur.
2) Shifting occurs slowly in response
to the condition of the engine throt-
tle.
The above two problems are due to
incorrect throttle pressure or other
factors involved in throttle pressure.
3) Checking for shift patterns
1) In the D range, shifting should be
made as DI -+ D2 -+ D3 smoothly and
vice versa; it should not be made in
the R range.
2) Kick down should activate prop-
erly_
3) When the select lever is shifted
from the D range to the 2 or 1 range,
shifting should be made as D 2 -+
2 (1 2 ) -+ II' Engine compression can
be utilized as a brake at 12 and II.
4) Shifting should not occur while
the select lever is at the 1 range.
5) With the shift lever in the 2 range,
the 2nd gear is engaged and 2nd speed
is maintained.
6) The select lever should be locked
when placed in the Prange.
Negative pressure
Shift
Car speed
-kPa(-mmHg, -inHg)
km/h (MPH)
DI -+ D2
50 - 59 (31 - 37)
Kickdown
D2 -+ D3
89 - 99 (55 - 62)
4.0 - 6.7 (30 - 50, l.18 - 1.97)
D3 -+ D2
82 - 92 (51 - 57)
D2 -+ DI
37 - 47 (23 - 29)
DI -+ D2
15-22(9-14)
Half-throttle
D2 -+ D3
41 - 51 (25 - 32)
26.7 (200, 7.87)
D3 -+ D2 or D3 -+ D I
13-22(8-14)
Dl -+ DI
10-17(6-11)
Full-throttle
*1 2 -+ II 41-51(25-32)
4.0 - 6.7 (30 - 50, l.18 - 1.97)
Minimum throttle 57.3 - 60.0
*12-+11
41 - 51 (25 - 32)
(430 - 450,16.93 - 17.72)
* 1: Reduce the car speed by shifting to 1st range from D range [while car speed is
50 km/h (31 MPH) or thereabout].
In road tests, if any abnormality is
noticed in the 2 range, it is necessary
to adjust the brake band. If by inspec-
tion the brake band is in good order,
check the servo piston for any sign of
oil leakage from the seal.
4) Check for the 4WD function
With the car in the 4WD mode, turn
the vehicle in a circle while lightly
depressing the accelerator pedal, and
then shift the vehicle into the FWD
mode. When the vehicle is shifted into
the FWD mode, a light shock should
be felt.
Whenever the transfer clutch facing is
replaced with a new one, the above
test should be conducted, for the
run-in purpose, two to three times
with the vehicle set in the 4WD mode
and with the steering wheel fully
turned.
3) Line Pressure Tests
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-
7-39
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 opera-
tion of the clutch, brake band or
control valve.
I) Measuring the line pressure
1) Temporarily attach the Oil Pres-
sure Gauge ASSY to a suitable place
in the driver's compartment, remove
the blind plug located in front of the
toeboard and pass the hose of the
Gauge ASSY to the engine compart-
ment.
I Pressure gauge hose
A 13·223
2 Hole in toe board (blank cap hole)
3 Brake pedal
Fig. 7-56 Measurement of line
pressure
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