Toyota 4-Runner 1985 Repair Manual page 411

AUTOMATIC TRANSMISSION - Test AT-9
~
Half Open (50%) Full Open (100%)
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.~ 100~o/c~o
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86
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50 - - - -- - - - - -
Q.)
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Vehicle Speed
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Full Opening
Cl
Q.)
C
2:·
c
100 %
co
Q.)
:8
86C=--"
,3rd
-
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OD
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.c
I-
o
Vehicle Speed
eJ)
8
8
Shock?
Slippage?
8
TE0013
TE0014
S1459
eJ)
•
•
Abnormal Noise?
Vibration?
S1460
ROAD TEST
CAUTION: Perform the test at normal operation fluid
temperature(50 - 80°C or 122 - 176°F).
1. "0" RANGE TEST
Shift into "0" range and while driving with the accelerator
pedal held constant at a specified point(throttle valve open-
ing 50
%
and 100 %}and the 00 swith liON", check the
following points.
(a) At each of the above throttle openings, check to see
that 1-+2, 2-+3 and 3-+00 up-shift take place and
also that the shift points conform to those shown in
the automatic shift diagram.
NOTE: 3-+00 up-shift does not take place with a throt-
tle valve opening of more than 86 % or coolant temperature
below 50°C (122°F).
EVALUATION
(1) If there is no 1 -+ 2 up-shift:
• Governor valve is defective
• 1 - 2 sh ift valve is stuck
(2) If there is no 2-+3 up-shift:
• 2-3 shift valve is stuck
(3) If there is no 3-+00 up-shift (throttle valve opening
of less than 86
%):
• 3-00 shift valve is stuck
(4) If the shift point is defective:
• Throttle cable is out-of-adjustment
• Throttle valve, 1-2 shift valve, 2-3 shift valve, 3-00
shift valve etc., are defective
(b) In the same manner, check the shock and the slip at
1 -+ 2, 2-+ 3 and 3-+00 shifts.
EVALUATION
If the shock is servere,
• Line pressure is too high
• Accumulator is defective
• Check ball is defective
(c) In "0" range 3rd gear or 00, check for abnormal noise
and vibration.
NOTE: Check for cause of abnormal noise and vibration
must be made with extreme care as they could also be due
to unbalance in propeller shaft, differential, tire, torque con-
verter, etc. or insufficient bending rigidity, etc., in the power
train.