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Home >> Toyota >> 2020 >> Highlander L, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 27 (Automatic Transmission System (UA81E / UA81F) - Diagnostics - Introduction) >> Automatic Transaxle System >> Mechanical System Tests [10/2022 - ] >> Mechanical System Tests [10/2022 - ]

Mechanical System Tests [10/2022 - ]

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  1. STALL SPEED TEST 
    WARNING:
    • Do not perform a stall test if there are any people or objects near the vehicle.
      GTY662133Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • The vehicle could begin moving suddenly, resulting in a serious accident.
    • Do not perform a stall test if any wheel chocks are out of position.
      GTY683452Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • The vehicle could begin moving suddenly, resulting in a serious accident.
    • Do not perform the stall test on a slippery or low-friction surface that could allow the tires to spin.
      GTY662136Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • The vehicle could begin moving suddenly, resulting in a serious accident.
    NOTE:
    • Do not perform the stall speed test for longer than 5 seconds.
    • When performing the stall speed test repeatedly, wait for 15 seconds or more between tests.
    • Perform this test with the ATF (Automatic Transaxle Fluid) at the normal operating temperature: 50 to 80°C (122 to 176°F)
    • Perform this test with the AUTO function (shift-linked function) of the electric parking brake system off.
    • Check that there is no obstruction within 5 m (16.4 ft.) of the driving direction.

      When torque is restricted by a safety function of the intelligent clearance sonar system, etc., the stall characteristics may not be normal.

    HINT: 

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

    1. Drive the vehicle until the transaxle fluid temperature has reached 50 to 80°C (122 to 176°F).
    2. Allow the engine to idle with the air conditioning and headlights off.
    3. Chock all 4 wheels.
    4. Set the parking brake and keep the brake pedal depressed firmly with your left foot.

      HINT: 

      When the parking brake indicator (red) is illuminated after the electric parking brake switch (electric parking brake switch assembly) has been pulled to the lock side, the maximum amount of braking force is applied if the electric parking brake switch (electric parking brake switch assembly) is pulled to the lock side one more time.

    5. Move the shift lever to D.
    6. Depress the accelerator pedal as much as possible with your right foot.
    7. Read the engine speed (stall speed) and release the accelerator pedal immediately.

      OK

      When the accelerator pedal is fully depressed, the engine speed does not increase to redline.

  2. SHIFT TIME LAG TEST 
    NOTE:

    Perform this test with the AUTO function (shift-linked function) of the electric parking brake system off.

    HINT: 

    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. Drive the vehicle until the transaxle fluid temperature has reached 50 to 80°C (122 to 176°F).
    2. Allow the engine to idle with the air conditioning off.
    3. Set the parking brake and keep the brake pedal depressed firmly.

      HINT: 

      When the parking brake indicator (red) is illuminated after the electric parking brake switch (electric parking brake switch assembly) has been pulled to the lock side, the maximum amount of braking force is applied if the electric parking brake switch (electric parking brake switch assembly) is pulled to the lock side one more time.

    4. 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.

        Standard Value

        D position time lag is less than 1.5 seconds

    5. 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.

        Standard Value

        R position time lag is less than 1.5 seconds

        EVALUATION

        Test Result Possible Cause
        D position time lag exceeds standard value
        • Line pressure is low
        • No. 1 clutch (C1) is worn
        • No. 2 brake (B2) is worn
        R position time lag exceeds standard value
        • Line pressure is low
        • No. 3 clutch (C3) is worn
        • No. 2 brake (B2) is worn
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