Mechanical System Tests

STALL TEST

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

NOTE:
- Perform the test at normal operation fluid temperature (122 - 176 °F or 50 - 80 °C).
- Do not continuously run this test longer than 5 seconds.
- To ensure safety, conduct this test in a wide, clear, level area, which provides good traction.
- The stall test should always be carried out in pairs. One should observe the conditions of wheels or wheel stoppers outside the vehicle while the other is performing the test.

MEASURE STALL SPEED

a. Chock the front and rear wheels.
b. Connect a tachometer to the engine.
c. Fully apply the parking brake.
d. Step down strongly on the brake pedal with your left foot.
e. Start the engine.
f. 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: A241L (5S-FE) rpm 2,350 ± 150 rpm
A241E (5S-FE) rpm 2,550 ± 150 rpm
A243L (4A-FE) rpm 2,400 ± 150/350 rpm

g. Perform the same test in R range.

EVALUATION

a. If the stall speed is the same for both ranges without the front wheels rotating but lower than specified value:
- Engine output may be insufficient
- Stator one-way clutch is not operating properly

b. If the stall speed in D range is higher than specified:
- Line pressure too low
- Forward clutch slipping
- No.2 one-way clutch not operating properly
- Underdrive one-way clutch not operating properly

c. If the stall speed in R range is higher than specified:
- Line pressure too low
- Direct clutch slipping
- First and reverse brake slipping
- Underdrive brake slipping

d. If the stall speed in both R and D ranges are higher than specified:
- Line pressure too low
- Improper fluid level
- Underdrive brake slipping A




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 underdrive clutch, forward clutch, direct clutch and first and reverse brake.

NOTE:
- Perform the test at normal operating fluid temperature (122 - 176 °F or 50 - 80 °C).
- 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 (N range): 5S-FE 700 ± 50 rpm (USA), 750 ± 50 rpm (CANADA)
4A-FE 800 ± 50 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 1.2 seconds

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

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
- No.2 and underdrive 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
- Underdrive brake worn




HYDRAULIC TEST

PREPARATION
a. Warm up the transaxle fluid.
b. Remove the transaxle case test plug and connect the hydraulic pressure gauge. SST 09992-00094 (Oil pressure gauge)

CAUTION:
- Perform the test at normal operating fluid temperature (122 - 176 °F or 50 - 80 °C)
- The line pressure test should always be carried out in pairs. One should observe the conditions of wheels or wheel stoppers outside the vehicle while the other is performing the test.

MEASURE LINE PRESSURE

a. Fully apply the parking brake and chock the four wheels.
b. Start the engine and check idling rpm.
c. Step down strongly on the brake pedal with your left foot and shift into D range.
d. Measure the line pressure when the engine is idling.
e. Press the accelerator pedal all the way down. Quickly read the highest line pressure when engine speed reaches stall speed.




f. In the same manner, perform the test in R range.

If the measured pressure are not up to specified values, recheck the throttle cable adjustment and perform a retest.

EVALUATION
a. If the measured values at all ranges are higher than specified:
- Throttle cable out of adjustment
- Throttle valve defective
- Regulator valve defective

b. If the measured values at all ranges are lower than specified:
- Throttle cable out of adjustment
- Throttle valve defective
- Regulator valve defective
- Oil pump defective
- Underdrive one-way clutch not operating properly

c. If pressure is low in the D range only:
- D range circuit fluid leakage
- Forward clutch defective
- Underdrive one-way clutch not operating properly

d. If pressure is low in the R range only:
- R range circuit fluid leakage
- Direct clutch defective
- First and reverse brake defective
- Underdrive one-way clutch not operating properly.

MEASURE GOVERNOR PRESSURE (A241L, A243L)
a. Check the parking brake to see that it is not applied.
b. Start the engine.
c. Shift into D range and measure the governor pressures at the speeds specified in the table.










EVALUATION
If governor pressure is defective:
- Line pressure defective
- Fluid leakage in governor pressure circuit
- Governor valve operation defective