Toyota Hilux Surf 1993 Owner's Manual page 397

AT–200
AUTOMATIC TRANSMISSION
ROAD TEST
NOTICE: Perform the test at normal operating fluid tem–
perature (50–800C or 122–1760F).
1. D POSITION TEST IN NORM AND PWR PATTERN POSI–
TIONS
Shift into the D position and hold the accelerator pedal
constant at the full throttle valve opening position.
(a) 1–2, 2–3 and 3–OlD up–shifts should take place, and
HINT: There is no O/D up–shift or lock–up when the en–
gine coolant temp. is below 70
EVALUATION
(1) If there is no 1 ³ 2 up–shift:
(2) If there is no 2 ³ 3 up–shift:
(3) If there is no 3 ³ O/D up–shift:
(4) If the shift point is defective:
(5) If the lock–up is defective:
(b) In the same manner, check the shock and slip at the
If the shock is excessive:
• Line pressure is too high
• Accumulator is defective
• Check ball is defective
HINT: The check for the cause of abnormal noise and
vibration must be made with extreme care as it could also
be due to loss of balance in the propeller shaft, differen–
tial, torque converter clutch, etc.
– Troubleshooting (Mechanical System Tests)
shift points should conform to those shown in the
automatic shift schedule.
Conduct a test under both Normal and Power patterns.
E
No.2 solenoid is stuck
1–2 shift valve is stuck
No.1 solenoid is stuck
2–3 shift valve is stuck
3–4 shift valve is stuck
Throttle valve, 1–2 shift valve, 2–3 shift valve, 3–4
shift valve etc., are defective
Lock–up solenoid is stuck
Lock–up relay valve is stuck
1 ³ 2, 2 ³ 3, and 3 ³ O/D up–shifts.
EVALUATION
(c) Run at the D position lock–up or O/D gear and check
for abnormal noise and vibration.
C (158 F).
E