Road Test - Toyota LAND CRUISER Service Manual Supplement

AUTOMATIC TRANSMISSION (STATION WAGON) - TROUBLESHOOTING

ROAD TEST

NOTICE: Perform the test at normal operating fluid tem-
perature (50 - 80°C or 122 - 176°F).
1. D RANGE TEST IN NORM AND PWR PATTERN RANGES
Shift into the D range and hold the accelerator pedal con-
stant at the full throttle valve opening position.
Check the following:
(a) 1 — 2, 2 — 3 and 3 — O/D up-shifts should take place,
and shift points should conform to those shown in the
automatic shift schedule.
Conduct a test under both Normal and Power patterns.
HINT: There is no O/D up-shift or lock-up when the
coolant temperature is below 55°C (131 °F).
EVALUATION
(1) If there is no 1 2 up-shift:
• No.2 solenoid is stuck.
• 1 — 2 shift valve is stuck.
(2) If there is no 2 3 up-shift:
• No.1 solenoid is stuck.
• 2 — 3 shift valve is stuck.
(3) If there is no 3 O/D up-shift:
• 3 — 4 shift valve is stuck.
(4) If the shift point is defective:
• Throttle valve, 1 — 2 shift valve, 2 — 3 shift valve, 3
— 4 shift valve etc., are defective.
(5) If the lock-up is defective:
• Lock-up solenoid is stuck.
• Lock-up relay valve is stuck.
(b) In the same manner, check the shock and slip at the 1
2, 2 3, and 3
EVALUATION
If the shock is excessive:
• Line pressure is too high.
• Accumulator is defective.
• Check ball is defective.
O/D up-shifts.
AT-49