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Page Title:
Table 7-3. Abnormal Pressure Reading Diagnosis |
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 TM 10-3930-633-34
Control
Pressure
Checks
Line Pressure
Engine Vacuum
57-77
17 inches
..57-82
16 inches
.57-88
15 inches
57-95
14 inches
57-102
13 inches
.57-108
12 inches
.57-115
11 inches
(1) At engine idle check control pressure
readings in all selector lever positions.
(2) Advance throttle to obtain 10 inches of
vacuum, and check pressure readings in all
selector lever positions.
(3) Advance throttle to obtain 1.0 inches or
less, and check pressure readings in all selector
lever positions.
(4) Compare readings with those given in
within specifications, the diaphragm unit and
control pressure regulating system are operating
properly. If control pressures are not within
specifications, refer to table 7-3 for causes of
abnormal reading.
Engine Vacuum
Control Pressure
Reading (In. / Hg)
Level
Possible Causes
I
Front oil pump leakage
18
Low
Control valve leakage
Control pressure regulator sticking
Defective diaphragm unit
High
Internal leakage
10
High
Low pump capacity (wear)
and
or
Restricted oil pan screen
1.0 or less
Low
Defective diaphragm unit
at 2, a NO DRIVE condition may be caused by an
inoperative forward clutch. A NO DRIVE con-
A "NO DRIVE" condition can exist, even with
dition at D may be caused by an inoperative
correct f l u i d control pressure, because of
forward clutch or one-way clutch. When there is
inoperative clutches or bands. Erratic shifts could
NO DRIVE in 1, the difficulty could be caused by
b e caused by a stuck governor valve. The
improper functioning of the forward clutch or low-
inoperative units can be located through a series
reverse band and the one-way clutch. Failure to
of checks by substituting air pressure for the
drive in reverse range could be caused by a
fluid pressure to determine the location of the
malfunction of the reverse-high clutch or low-
malfunction.
reverse band.
a. Clutch Failures. When the selector lever is
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