Mechanical System Tests
MECHANICAL SYSTEM TESTS1. PERFORM 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 to 80 degrees C (122 to 176 degrees F).
- Do not continuously run this test for longer than 5 seconds.
- To ensure safety, do 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.
1. Chock the 4 wheels.
2. Connect an OBD II scan tool or hand-held tester to the DLC3.
3. Fully apply the parking brake.
4. Keep your left foot pressed firmly on the brake pedal.
5. Start the engine.
6. Shift into the D position. Fully press down the accelerator pedal with your right foot. Quickly read the stall speed at this time.
Stall speed: 2,550 (+) 150 rpm
7. Do the same test in R position.
Stall speed: 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 No.2 one-way clutch, reverse clutch, forward clutch, and 1st and reverse brake.
NOTE:
- Do the test at normal operating ATF temperature 50 to 80 degrees C (122 to 176 degrees F).
- Be sure to allow 1 minute interval between tests.
- Take 3 measurements and take the average value.
1. Connect an 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: approx. 700 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.
5. 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