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Mechanical System Tests

WARNING: This page is about a different car, the 2008 Toyota RAV4. 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.

    NOTE:
    • Do not perform the stall speed test longer than 10 seconds.
    • 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.
    1. Connect Techstream to the DLC3.
    2. Run 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. 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 the D position.
    7. Depress the accelerator pedal as much as possible with your right foot.
    8. Read the engine rpm (stall speed) and release the accelerator pedal immediately.

      Stall speed: 

      2,600 +- 150 rpm 

      Evaluation: 

      POSSIBLE CAUSE REFERENCE

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

      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 slipping
      • U/D (underdrive) brake slipping
      • U/D (underdrive) one-way clutch is not operating properly
      • No. 1 one-way clutch not operating properly
      • Improper fluid level
      NOTE: Perform the test at the normal operating ATF temperature of 50 to 80°C (122 to 176°F).
  2. SHIFT TIME LAG TEST 

    HINT:

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

    1. Connect Techstream to the DLC3.
    2. Run 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 range 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 procedures above 3 times, and calculate the average time of the 3 tests.
    6. Check the R range 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 procedures above 3 times, and calculate the average time of the 3 tests.

        Standard value: 

        D range time lag is less than 1.2 seconds 

        R range time lag is less than 1.5 seconds 

        Evaluation: 

        POSSIBLE CAUSE REFERENCE

        Test Result Possible Cause
        D range time lag exceeds standard value
        • Line pressure is too low
        • Forward clutch worn
        • No. 1 one-way clutch is not operating properly
        • U/D (underdrive) one-way clutch is not operating
        • U/D (underdrive) brake worn
        R range time lag exceeds standard value
        • Line pressure is too low
        • Reverse clutch worn
        • 1st and reverse brake worn
        • U/D (underdrive) brake worn
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