AUTOMATIC TRANSMISSION SYSTEM MECHANICAL SYSTEM TESTS


  1. STALL SPEED TEST

    Tech Tips

    This test is to check the overall performance of the engine and transmission.

    CAUTION:


    • This test should be done on a paved surface (a surface that is not slippery).

    • To ensure safety, perform this test in an open and level area that provides good traction.

    • The stall speed test should always be performed with at least 2 people. One person should observe the condition of the wheels and wheel chocks while the other is performing the test.

    Note


    • Do not perform the stall speed test for longer than 5 seconds.

    • Perform this test with the ATF (Automatic Transmission Fluid) at the normal operating temperature: 50 to 80°C (122 to 176°F)


    1. Connect the GTS to the DLC3.

    2. Drive the vehicle until the transmission fluid temperature has reached 50 to 80°C (122 to 176°F).

    3. Allow the engine to idle with the air conditioning and headlights off.

    4. Chock all 4 wheels.

    5. Set the parking brake and keep the brake pedal depressed firmly with your left foot.

    6. Move the shift lever to D.

    7. Depress the accelerator pedal as much as possible with your right foot.

    8. Read the engine speed (stall speed) and release the accelerator pedal immediately.

      Evaluation
      Test Result Possible Cause
      Stall speed is lower than standard value

      • Engine power output may be insufficient

      • Stator one-way clutch not operating properly

      Tech Tips

      If the value is less than the specified value by 600 rpm or more, the torque converter could be faulty.
      Stall speed is higher than standard value

      • Line pressure is too low

      • Forward multiple clutch (C1) slipping

      • No. 1 one-way clutch (F1) is not operating properly

      • Improper fluid level

  • SHIFT TIME LAG TEST

    Tech Tips

    When the shift lever is moved while the engine is idling, there will be a certain time lapse or lag before shock can be felt. This is used for checking the condition of the clutch and brake.


    1. Connect the GTS to the DLC3.

    2. Drive the vehicle until the transmission fluid temperature has reached 50 to 80°C (122 to 176°F).

    3. Allow the engine to idle with the air conditioning OFF.

    4. Set the parking brake and keep the brake pedal depressed firmly.

    5. Check the D position time lag.


      1. Move the shift lever to N and wait for 1 minute.

      2. Move the shift lever to D and measure the time until shock is felt.

      3. Repeat the 2 steps above 3 times, and calculate the average time of the 3 tests.

    6. Check the R position time lag.


      1. Move the shift lever to N and wait for 1 minute.

      2. Move the shift lever to R and measure the time until shock is felt.

      3. Repeat the 2 steps above 3 times, and calculate the average time of the 3 tests.