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Mechanical System Tests

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.
  1. STALL SPEED TEST 

    HINT:

    This test is to check the overall performance of the engine and transaxle by measuring the stall speeds in the D position.

    NOTE:
    • Do not perform the stall speed test for longer than 5 seconds.
    • To ensure safety, perform this test in a wide, clear level area which provides good traction.
    • The stall speed test must always be carried out by pairs of technicians. One technician must watch the wheels and wheel stoppers from outside the vehicle to make sure they do not slip, while the other performs the test.
    1. Connect the Techstream to the DLC3.
    2. Run the vehicle until the ATF (Automatic Transmission Fluid) temperature reaches 50° to 80°C (122° to 176°F).
    3. Allow the engine to idle with the air conditioning OFF.
    4. Chock all 4 wheels.
    5. Set the parking brake and keep the brake pedal firmly depressed with your left foot.
    6. Shift the shift lever to the D position.
    7. Depress the accelerator pedal all the way down with your right foot.
    8. Read the engine rpm (stall speed) and release the accelerator pedal immediately.

      Standard value: 

      1850 to 2450 rpm 

      Evaluation: 

      TEST RESULT

      Test Result Possible Cause
      Stall speed is lower than standard value
      • Stator one-way clutch is not operating properly
      • Engine power is insufficient

      HINT:
      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 clutch (C1) is slipping
      • No. 2 one-way clutch (F2) is not operating properly
  2. SHIFT TIME LAG TEST 

    HINT:

    This test is to check the conditions of the direct clutch, forward clutch, 1st brake and reverse brake.

    1. Run the vehicle until the ATF (Automatic Transmission Fluid) temperature reaches 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 firmly depressed with your left foot.
    4. Check the D position time lag.
      1. Shift the shift lever into the N position and wait for 1 minute. (*1)
      2. Shift the shift lever into the D position and measure the time until the shock is felt. (*2)
      3. Repeat procedures (*1) and (*2) three times, and calculate the average time of the three tests.
    5. Check the R position time lag.
      1. Shift the shift lever into the N position and wait for 1 minute. (*3)
      2. Shift the shift lever into the R position and measure the time until the shock is felt. (*4)
      3. Repeat procedures (*3) and (*4) three times, and calculate the average time of the three tests.

        Standard value: 

        D position time lag is less than 1.2 seconds 

        R position time lag is less than 1.5 seconds 

        Evaluation 

        TEST RESULT

        Test Result Possible Cause
        D position time lag exceeds standard value
        • Line pressure is too low
        • Forward clutch (C1) is worn
        • No. 2 one-way clutch (F2) is not operating properly
        R position time lag exceeds standard value
        • Line pressure is too low
        • Reverse clutch (C3) is worn
        • 1st and reverse brake (B3) is worn
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