Mechanical Systems Tests
MECHANICAL SYSTEM TESTSa. Measure the stall speed.
The object of this test is to check the overall performance of the transaxle and engine by measuring the stall speeds in the D position.
NOTE:
- Perform the test at the normal operating 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 provide 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. Fully apply the parking brake.
3. Keep your left foot pressed firmly on the brake pedal.
4. Start the engine.
5. Shift into the D position. Press all the way down on the accelerator pedal with your right foot.
Quickly read the stall speed at this time.
Stall speed:
U151E: 2,100 ± 150 rpm
U151F: 2,550 ± 150 rpm
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 conditions of the U/D direct clutch, forward clutch, and 1st and reverse brake.
NOTE:
- Perform the test at the normal operating fluid temperature of 50 to 80 °C (122 to 176 °F).
- Be sure to allow 1 minute interval between the tests.
- Take 3 measurements and take the average value.
1. Fully apply the parking brake.
2. Start the engine and check idle speed.
Idle speed: 700 ± 50 rpm (In N position and A/C OFF)
3. 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.
Measure the time lag of N -> R in the same way.
Time lag:
N -> D Less than 1.2 seconds
N -> R Less than 1.5 seconds