1989-Montero · auto tranny · страница 22 из 109 · Открыть оригинал PDF ↗
Диагностика и устранение неисправностей
FLUID LEVEL AND ATF CONDITION
AZEBAP
(1) Place the vehicle on a level surface.
Общие сведения
(2) Before removing the dipstick, wipe all dirt from
area around the dipstick.
Automatic transmission malfunctions may be caus-
ed by the following conditions:
(3) With the selector lever in the “P” position and
the parking brake applied, start the engine.
(4) The engine should be running at idle and the
transmission should be warmed up sufficiently.
(5) Move the selector lever through all positions to
fill the torque converter and hydraulic circuit
with fluid. Then, place the lever in the”N” or “P”
position.
(I) Improper maintenance and adjustment
(2) Mechanical malfunctions
(3) Hydraulic malfunctions
(4) Poor engine performance
Troubleshooting in the event of any such malfunc-
tions should begin by checking fluid level, ATF con-
dition, manual linkage adjustment, throttle control
cable adjustment and other conditions whose
deviation from standards can be readily known.
Then, road test shall be performed to determine
whether or not the problem has been corrected or
more diagnosis is necessary. If the problem still
persists after these tests and corrections, hydraulic
tests should be performed for further troubleshoot-
ing.
(6) Check to see that the fluid level is within the
range between “COLD” upper limit and the
“HOT” lower limit on the dipstick.:NL
If the fluid level is low, top up until the level rises
to within the range between the “HOT” lower
and upper limits.
Low fluid level can allow the oil pump to take in air
together with fluid, leading to various troubles. Air
trapped in hydraulic circuit forms bubbles which
make the fluid spongy. This loweres pressure and
slows down pressure buildup.
If the transmission has too much fluid, gears churn
up foam and cause same conditions as when the
fluid level is low, resulting in premature deteriora-
tion of ATF. In either case, air bubbles can cause
overheating and fluid oxidation and varnishing,
which can interfere with normal valve, clutch and
servo operation. Foaming can also result in fluid
escaping from the transmission vent where it may
be mistaken for a fluid leak.
Along with the fluid level, it is equally important to
check condition of fluid. When fluid smells burned,
it is contaminated with metal bushing or friction
material particles and hence a complete overhaul of
the transmission is needed. Be sure to examine
fluid on the dipstick closely.
After fluid has been checked, insert the dipstick un-
til it is seated fully to seal out water and dirt.
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