Mechanical System Tests
MECHANICAL SYSTEM TESTSa. Measure the stall speed.
This test checks the overall performance of the transaxle and engine by measuring the stall speeds in the D and R positions.
NOTE:
- Conduct the test at normal operating fluid temperature 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 flat 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 the 4 wheels.
2. Connect the OBD II scan tool or 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. Quickly read the stall speed at this time.
Stall speed: 2,450 to 2,750 rpm
7. Conduct the same test in the R position.
Stall speed: 2,450 to 2,750 rpm
Evaluation
b. Measure the time lag.
When the shift lever is moved while the engine is idling, there will be a certain amount of time lapse or lag before shock can be felt. This is used for checking the conditions of the O/D direct clutch, forward clutch, and 1st & reverse brake.
NOTE:
- Conduct the test at normal operating fluid temperature 50 to 80 °C (122 to 176 °F).
- Be sure to allow 1 minute interval between tests.
- Take 3 measurements and take the average value.
1. Connect the OBD II scan tool or hand-held tester to the DLC3.
2. Fully apply the parking brake.
3. Start the engine and check idle speed.
Idle speed: 700 ± 50 rpm (Shift lever in N position and air conditioner OFF)
4. Shift the shift lever from the N to D position. Using a stop watch, measure the amount of time from when the lever is shifted until shock is felt.
N -> D time lag: Less than 1.2 seconds
5. Measure the time lag for N -> R using the same procedures as mentioned above (1) to (4).
N -> R time lag: Less than 1.5 seconds
Evaluation (If N -> D time or N -> R time lag is longer than the specified)