Toyota T100 1996, Service Manual, Page: 537 / 2062

− DIAGNOSTICS AUTOMATIC TRANSMISSION
DI − 273
1996 TOYOTA T100 (RM449U)
Evaluation:
Problem Possible cause
(a) Stall speed low in D and R positions
S Engine output may be insufficient
S Stator one − way clutch is operating properly
S HINT: If more than 600 rpm below the specified value, the torque
converter could be faulty.
(b) 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
(c) Stall speed high in R position
S Line pressure too low
S Direct clutch slipping
S 1st and reverse brake slipping
S O/D one − way clutch not operating properly
(d) 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 fluid 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 (In N position and air conditioner OFF):
3RZ
− FE: 700
±
50 rpm
5VZ − FE: 700 ± 50 rpm
(3) Shift the shift lever from N to D position. Using a stop watch, measure the time from when the
lever is shifted 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
N → R Less than 1.5 seconds
Evaluation (If N → D time or N → R time lag is longer than specified):
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