Mechanical System Tests
MECHANICAL SYSTEM TESTS1. MEASURE STALL SPEED
a. The object of this test is to check the overall performance of the transmission and engine by measuring the stall speeds in the D position.
NOTE:
- Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature of 50° to 80°C (122° to 176°F).
- Do not continuously run this test for longer than 5 seconds.
- To ensure safety, conduct this test in a wide, clear and level area which provides good traction.
- The stall test should always be carried out in pairs. One technician should observe the condition of the wheels or wheel stoppers outside the vehicle while the other is doing the test.
1. Chock the all wheels.
2. Connect the hand-held tester to the DLC3.
3. Fully apply the parking brake.
4. Keep your left foot pressing firmly on the brake pedal.
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: 2,400 ± 150 rpm
Evaluation
2. MEASURE TIME LAG
a. 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 clutch and brake.
NOTE:
- Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature of 50° to 80°C (122° to 176°F).
- Be sure to allow 1 minute interval between tests.
- Take 3 measurements and calculate the average value.
1. Connect the hand-held tester to the DLC3.
2. Fully apply the parking brake.
3. Start and warm up the engine and check the idle speed.
Idle speed: 700 ± 50 rpm (In N position and A/C OFF)
4. Shift the shift 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 specified)