Toyota 1996 LAND CRUISER, User Manual

Page: 576 / 1381

DI − 140
− DIAGNOSTICS AUTOMATIC TRANSMISSION
1996 LAND CRUISER (RM451U)
(6) Shift into the D position. Press all the way down on the accelerator pedal with your right foot.
Quickly read the stall speed at this time.
Stall speed: 1,950 ± 150 rpm
(7) Do the same test in R position.
Stall speed: 1,950 ± 150 rpm
Evaluation:
Problem Possible cause
Stall speed low in D and R positions
S Engine output may be insufficient
S Stator one − way clutch is operating properly
HINT:
If more than 600 rpm below the specified value, the torque con-
verter clutch could be faulty.
Stall speed high in D position
S Line pressure too low
S Forward clutch slipping
S No. 2 one − way clutch not operating properly
S O/D one − way clutch not operating properly
Stall speed high in R position
S Line pressure too low
S Direct clutch slipping
S 1st and reverse brake slipping
S
O/D clutch slipping
Stall speed high in D and R positions
S Line pressure too low
S Improper fluid level
S O/D one − way clutch not operating properly
(b) Measure the time lag.
When the shift lever is shifted while the engine is idling, there will be a certain time lapse or lag before
the shock can be felt. This is used for checking the condition of the O/D direct clutch, forward clutch,
direct clutch and 1st and reverse brake.
NOTICE:
S
Do the test at normal operating ATF temperature 50 − 80 ° C (122 − 176 ° F).
S
Be sure to allow 1 minute interval between tests.
S
Take 3 measurements and take the average value.
(1) Fully apply the parking brake.
(2) Start the engine and check idle speed.
Idle speed: 650 ± 50 rpm (In N position and air conditioner OFF)
(3) Shift the shift lever from N to D position. Using a stop watch, measure the time it takes from shift-
ing the lever until the shock is felt.
In the same manner, measure the time lag for N
→
R.
Time lag: N → D Less than 1.2 seconds
In the same way, measure the time lag for N → R.
Time lag: N → R Less than 1.5 seconds
If N
→
D time or N
→
R time lag is longer than specified:
Evaluation:
Problem Possible cause
N → D time lag is longer
S Line pressure too low
S Forward clutch worn
S O/D one − way clutch not operating properly
N → R time lag is longer
S Line pressure too low
S Direct clutch worn
S 1st and reverse brake worn
S O/D one − way clutch not operating properly
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Version 1.00 - 12/21/2010