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Home >> Toyota >> 2009 >> FJ Cruiser 4WD, Part Time >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - A750F >> Automatic Transmission System >> Mechanical System Tests

Mechanical System Tests

  1. STALL SPEED TEST 

    HINT:

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

    NOTE:
    • Do not perform the stall speed test for longer than 5 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 by 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 a 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. Shift the shift lever into the drive 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.

      Standard value: 

      2,250 to 2,550 rpm 

      Evaluation: 

      EVALUATION

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

      HINT:
      Torque converter is faulty (stall speed is less than standard value by 600 rpm or more)
      Stall speed is higher than standard value
      • Line pressure is low
      • No. 1 clutch (C1) slipping
      • No. 3 one-way clutch (F3) is not operating properly
      • Improper fluid level
  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 a 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. Shift the shift lever into the N position and wait for 1 minute.
      2. Shift the shift lever into the D position 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. Shift the shift lever into the N position and wait for 1 minute.
      2. Shift the shift lever into the R position 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: 

        EVALUATION

        Test Result Possible Cause
        D range time lag exceeds standard value
        • Line pressure is low
        • No. 1 clutch (C1) is worn
        • No. 3 one-way clutch (F3) is not operating properly
        R range time lag exceeds standard value
        • Line pressure is low
        • No. 3 clutch (C3) is worn
        • No. 4 brake (B4) is worn
        • No. 1 one-way clutch (F1) is not operating properly
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