Automatic Transmission Troubleshooting - Toyota Hilux Surf 1993 Owner's Manual

TROUBLESHOOTING
Basic Troubleshooting
1. Troubleshooting occuring with the automatic transmission can be caused by either the engine, electri–
cal control or the transmission itself. These three areas should be distinctly isolated before proceeding
with troubleshooting.
2. Troubleshooting should begin with the simplest operation, working up in order or difficulty, but first
determine whether the trouble lies within the engine, electrical control or transmission.
3. Proceed with the inspection as follows:
PRELIMINARY CHECK (See page AT–14)
(a) Check the tire inflation.
(b) Check the idle speed.
(c) Check the fluid level and fluid condition.
(d) Check the throttle cable mark.
(e) Check the shift linkage.
(f) Check the Park/Neutral Position Switch.
STALL TEST (See page AT–20)
Check the engine and torque converter clutch.
TIME LAG TEST (See page AT–21)
Check the automatic transmission (each clutch, brake and gear) for wear.
HYDRAULIC TEST (See page AT–22)
Measure the line pressure and make basic check of fluid circuit.
ROAD TEST (See page AT–24)
Confirm if trouble lies within automatic transmission. If noisy or
vibrating, the possible cause could be with the engine, drive shaft, tires,
etc.
(No up–shift to overdrive/No down–shift from overdrive)
OVERDRIVE CONTROL SYSTEM CHECK (See page AT–16)
AUTOMATIC TRANSMISSION – Troubleshooting (Basic Troubleshooting)
AT–11