AUTOMATIC TRANSAXLE SYSTEM MECHANICAL SYSTEM TESTS

  1. STALL SPEED TEST

    Tip:

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

    CAUTION:

    • Driving tests should be performed 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 more than 5 seconds.

    1. Connect the GTS to the DLC3.

    2. Run the vehicle until the ATF temperature is between 50 and 80°C (122 and 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.

      Standard Value

      Stall Speed

      Acceptable Deviation

      2750 rpm

      + 200 rpm

      - 450 rpm
      Table 1. Evaluation

      Test Result

      Possible Cause

      Stall speed is lower than standard value

      • Engine power output may be insufficient

      • Stator one-way clutch is not operating properly

      Tip:

      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

      • Clutch No. 1 (C1) is slipping

      • One-way clutch (F1) is not operating properly

      • Improper fluid level

  2. SHIFT TIME LAG TEST

    Tip:

    When the shift lever is moved 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 clutches and brakes.

    1. Connect the GTS to the DLC3.

    2. Run the vehicle until the ATF temperature is between 50 and 80°C (122 and 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 the shock is felt.

      3. Repeat the 2 steps above 3 times, and then 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 the shock is felt.

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

        Standard value

        D position time lag is less than 1.2 seconds

        R position time lag is less than 1.5 seconds

        Table 2. Evaluation (If N to D or N to R time lag is longer than the specified time)

        Test Result

        Possible Cause

        D position time lag exceeds standard value

        • Line pressure is too low

        • Clutch No. 1 (C1) is worn

        • One-way clutch (F1) is not operating properly

        R position time lag exceeds standard value

        • Line pressure is too low

        • Brake No. 2 (B2) is worn

        • Brake No. 3 (B3) is worn