Mechanical System Tests
MECHANICAL SYSTEM TESTSa. Check the stall speed.
The object of this test is to check the overall performance of the transmission and engine by measuring the stall speed in the D and R positions.
NOTE:
- Conduct the test at the normal operating temperature of the ATF: 50 - 80 °C (122 - 176 °F).
- Do not run this test continuously for more than 5 seconds.
- To ensure safety, conduct this test in a wide, clear and level area which provides good traction.
- The test should always be carried out in pairs. One technician should observe the conditions of the wheels or the wheel stoppers outside the vehicle while the other is conducting the test.
1. Chock the 4 wheels.
2. Connect the scan tool (OBD II scan tool or hand-held tester) to the DLC3.
3. Fully apply the parking brake.
4. keep your left foot depressing firmly the brake pedal.
5. Start the engine.
6. Shift into the D position. Depress all the way down the accelerator pedal with your right foot. Quickly read the stall speed at this time.
Stall speed: 2,250 ± 150 rpm
7. Conduct the same test in the R position.
Stall speed: 2,250 ± 150 rpm
Evaluation
b. Measure the time lag.
When the shift lever is shifted while the engine is idling, there will be a certain lapse of time or time lag before the shock can be felt. This is used for checking the condition of the O/D direct clutch, the forward clutch, and the 1st and reverse brake.
NOTE:
- Conduct the test at the normal operating temperature of the ATF: 50 - 80 °C (122 - 176 °F).
- Be sure to allow 1 minute interval between the tests.
- Perform measurement 3 times and take the average value.
1. Fully apply the parking brake.
2. Start the engine and check the idle speed.
Idle speed: 700 ± 50 rpm (in the N position and the air conditioner OFF)
3. Shift the shift lever from the N to D position. Using a stop watch, measure the time from the lever is shifted until the shock is felt.
Time lag at N -> D: Less than 1.2 seconds
4. In the same manner, measure the time lag at N -> R.
Time lag at N -> R: Less than 1.5 seconds
Evaluation (if the N -> D or N -> R is longer than the specified)