Mechanical System Tests

STALL TEST



The object of this test is to check the overall performance of the transmission and engine by measuring the stall speeds in the D and R ranges.

NOTICE:
^ Perform the test at normal operating fluid temperature (50 - 80°C or 122 176°F).
^ Do not continuously run this test longer than 5 seconds.

MEASURE STALL SPEED
(a) Warm up the transmission fluid.
(b) Chock the front and rear wheels.
(c) Connect a tachometer to the engine.
(d) Fully apply the parking brake.
(e) Step down strongly on the brake pedal with your left foot.
(f) Start the engine.
(g) Shift into the D range. Step 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

(h) Perform the same test in R range.

EVALUATION
(a) If the stall speed is the same for both ranges but lower than specified value:
^ Engine output may be insufficient
^ Stator one-way clutch is not operating properly

HINT: If more than 600 rpm below the specified value, the torque converter could be faulty.

(b) If the stall speed in D range is higher than specified:
^ Line pressure too low
^ Front clutch slipping
^ No.2 one-way clutch not operating properly
^ O/D one-way clutch not operating properly

(c) If the stall speed in R range is higher than specified:
^ Line pressure too low
^ Rear clutch slipping
^ First and reverse brake slipping
^ O/D one-way clutch not operating properly

(d) If the stall speed in both R and D ranges are higher than specified:
^ Line pressure too low
^ Improper fluid level
^ O/D one-way clutch not operating properly


TIME LAG TEST




If 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, front clutch, rear clutch and first and reverse brakes.

NOTICE:
^ Perform the test at normal operating fluid temperature (50 - 80°C or 122 - 176°F)
^ Be sure to allow one minute intervals 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

(c) Shift the shift lever from N to D position. Using a stop watch, measure the time it takes from shifting the lever until the shock is felt.

Time lag: Less than 0.7 seconds

(d) In same manner, measure the time lag N -> R.

Time lag: Less than 1.2 seconds


EVALUATION
(a) If N -> D time lag is longer than specified:
^ Line pressure too low
^ Front clutch worn
^ O/D one-way clutch not operating properly

(b) If N -> R time lag is longer than specified:
^ Line pressure too low
^ Rear clutch worn
^ First and reverse brake worn
^ O/D one-way clutch not operating properly