Mechanical System Tests

MECHANICAL SYSTEM TESTS

a. 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 and R positions.

NOTE:
- Do the test at normal operating ATF temperature 50 - 80 °C (122 - 176 °F).
- Do not continuously run this test longer than 5 seconds.
- To ensure safety, conduct 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.
- Check the 4 wheels.
- Connect an OBD II scan tool or TOYOTA hand-held tester to DLC3.
- Fully apply the parking brake.
- Keep your left foot pressing firmly on the brake pedal.
- Start the engine.
- 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: 2,400 ± 150 rpm
- Do the same test in R position.
Stall speed: 2,400 ± 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 O/D direct clutch, forward clutch, and 1st & reverse brake.

NOTE:
- Do the test at normal operating fluid temperature 50 - 80 °C (122 - 176 °F).
- Be sure to allow 1 minute interval between tests.
- Take 3 measurements and take the average value.
- Connect an OBD II scan tool or TOYOTA hand-held tester to DLC3.
- Fully apply the parking brake.
- Start the engine and check idle speed.

Idle speed: 750 ± 50 rpm (In N position and air conditioner OFF)

- Shift the shift lever from N to D position. Using a stop watch, measure the time from when the lever is shifted until the shock is felt.
In the same manner, measure the time lag for N -> R.

Time lag:
N -> D Less than 1.2 seconds
N -> R Less than 1.5 seconds

Evaluation (If N -> D time or N -> R time lag is longer than the specified):