Mechanical System Tests
MECHANICAL SYSTEM TESTS1. PERFORM MECHANICAL SYSTEM TESTS
a. Measure the stall speed.
The object of this test is to check the overall performance of the transmission and engine by measuring the stall speeds in the D positions.
NOTE:
- Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature 50 to 80 degrees C (122 to 176 degrees F).
- Do not continuously run this test for longer than 5 seconds.
- To ensure safety, do this test in a wide, clear level area which provides good traction.
- The stall test should always be carried out in pairs. One technician should observe the conditions of wheels or wheel stoppers outside the vehicle while the other is doing the test.
1. Chock all 4 wheels.
2. Connect a hand-held tester to DLC3.
3. Fully apply the parking brake.
4. Using your left foot, keep the brake pedal firmly depressed.
5. Start the engine.
6. Shift into the D position. Press all the way down on the accelerator pedal with your right foot.
7. Quickly read the stall speed at this time.
Stall speed: 2,200 ± 150 rpm
Evaluation:
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 direct clutch, forward clutch, and 1st and reverse brake.
NOTE:
- Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature: 50 to 80 degrees C (122 to 176 degrees F).
- Be sure to allow for a 1 minute interval between tests.
- Perform the test three times, and measure the time lags. Calculate the average value of the three time lags.
1. Connect a hand-held tester to DLC3.
2. Fully apply the parking brake.
3. Start and warm up the engine and check idle speed.
Idle speed: approx. 700 rpm (In N position and A/C OFF)
4. Shift the lever from the N to D position. Using a stop watch, measure the time from when the lever is shifted until the shock is felt.
Time lag: N -> D Less than 1.2 seconds
5. In the same manner, measure the time lag for N -> R.
Time lag:N -> R Less than 1.5 seconds
Evaluation (If N -> D time or N -> R time lag is longer than the specified):