Time Lag Test; Measure Time Lag - Toyota LAND CRUISER Service Manual Supplement

AUTOMATIC TRANSMISSION (STATION WAGON)

TIME LAG TEST

When the shift lever is shifted while the engine is idling, there will be a certain time elapse 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 first and reverse brake.
NOTICE:
• Perform the test at normal operating fluid temperature (50 — 80°C or 122 — 176°F).
• Be sure to allow one minute interval between tests.
• Make three measurements and take the average value.

MEASURE TIME LAG

(a) Fully apply the parking brake.
(b) Start the engine and check the idle speed.
Idle speed:
650 rpm (N range)
(c) Shift the shift lever from N to D range. Using a stop watch, measure the time it takes from shifting the
lever until the shock is felt.
Time lag:
Less than 1.0 seconds
(d) In same manner, measure the time lag for N
Time lag:
Less than 1.5 seconds
EVALUATION
(a) If N D time lag is longer than specified:
• Line pressure too low
• Forward clutch worn
• O/D one-way clutch not operating properly
(b) If N R time lag is longer than specified:
• Line pressure too low
• Direct clutch worn
• First and reverse brake worn
• O/D one-way clutch not operating properly
TROUBLESHOOTING
R.
AT-45