Toyota Celica Supra 1986 Service And Repair Manual page 300

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Shock
Slippage
AUTOMATIC TRANSMISSION -Road Test
AT· 25
00
8
; r
; I
8
se . . . .
' ROAD TEST
CAUTION: Perfonn the test at normal operating fluid temper·
ature (50 - 80°C or 122 - 176°F).
1. "D" RANGE TEST IN NORM, AND PWR PATTERN
RANGES
Shift into "0" range and hold the accelerator pedal cons-
tant at 50% and 100% throttle valve opening positions.
Push in one of the pattern selector buttons and check the
following:
(a) 1-2, 2-3. 3 -00 and lock-up up-shifts should take
place, and shift points should conform to those shown
in the automatic shift diagram.
NOTE:
(1) There is no 3rd up-shift or lock-up when coolant tem-
perature is below 36°C (95°F) and speed is under 48
kmlh (30 mph).
(2) There is no 00 up-shift or lock-up when coolant is be-
low 63°C (145°F) and speed is under 63 km/h (39
mph), or if there is a 10 km/h 16 mph) difference be-
tween the set cruise control speed.
EVALUATION
( 1) If there is no 1 - 2 up-shift:
o
No.2 solenoid is stuck
• 1-2 shift valve is stuck
(2) If there is no 2 - 3 up-shift:
o
No.1 solenoid is stuck
o
2-3 shift valve is stuck
(3) If there is no 3 - 00 up-shift (throttle valve opening
1/2),
o
3 -00 shift valve is stuck
(4) If the shift point is defective:
o
Throttle valve, 1·2 shift valve, 2·3 shift valve, 3-00
shift valve etc., are defective.
(5) If the lock-up is defective:
o
No.3 solenoid is stuck
o
Lock-up relay valve is stuck
(b) In the same manner, check the shock and the slip at
1 - 2, 2 - 3 and 3 - 00 up-shifts.
EVA.LUATION
If the shock is excessive:
• Line pressure is too high
• Accumulator is defective
o
Check ball is defective