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Mechanical System Tests [04/2013 - 08/2015]

WARNING: This page is about a different car, the 2015 Lexus IS 250 and 2014 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
  1. PERFORM MECHANICAL SYSTEM TESTS 
    1. Measure the stall speed.

      The object of this test is to check the overall performance of the transmission and engine by measuring the stall speeds in the D position.

      NOTE:
      • Driving test should be done on a paved road (a nonskid road).
      • Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature 50 to 80°C (122 to 176°F).
      • Do not continuously run this test for longer than 5 seconds.
      • When performing the stall speed test repeatedly, wait for 15 seconds or more between tests.
      • To ensure safety, do this test in a wide, clear level area which provides good traction.
      • The stall test should always be carried out in pairs. One technician should observe the conditions of wheels or wheel stoppers outside the vehicle while the other is doing the test.
      1. Chock the 4 wheels.
      2. Connect the Techstream to the DLC3.
      3. Fully apply the parking brake.
      4. Keep your left foot pressed firmly on the brake pedal.
      5. Start the engine.
      6. Shift into the D position. Press all the way down on the accelerator pedal with your right foot.
      7. Quickly read the stall speed at this time.
        STANDARD VALUE:

        Stall Speed
        2550 rpm + 150 rpm
        - 150 rpm
        EVALUATION:

        Problem Possible cause
        (a) Stall engine speed is low in D position
        • 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 assembly could be faulty.
        (b) Stall engine speed is high in D position
        • Line pressure is too low
        • No. 1 clutch (C1) slipping
        • No. 3 one-way clutch (F3) not operating properly
        • No. 4 one-way clutch (F4) not operating properly
        • Improper fluid level
    2. Measure the time lag.
      1. When the shift lever is shifted 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.
        NOTE:
        • Perform the test at the normal operating ATF (Automatic Transmission Fluid) temperature: 50 to 80°C (122 to 176°F).
        • Be sure to allow 1 minute interval between tests.
        • Perform the test three times, and measure the time lags. Calculate the average value of the three time lags.
      2. Connect the Techstream to the DLC3.
      3. Allow the engine to idle with the air conditioning OFF.
      4. Fully apply the parking brake.
      5. Shift the lever from N to D position. Using a stop watch, measure the time from when the lever is shifted until shock is felt.

        Time lag

        N → D less than 1.2 seconds

      6. In the same way, measure the time lag for N → R.

        Time lag

        N → R less than 1.5 seconds

        EVALUATION (IF N → D OR N → R TIME LAG IS LONGER THAN THE SPECIFIED):

        Problem Possible cause
        N → D time lag is longer
        • Line pressure is too low
        • No. 1 clutch (C1) worn
        • No. 3 one-way clutch (F3) not operating properly
        • No. 4 one-way clutch (F4) not operating properly
        N → R time lag is longer
        • Line pressure is too low
        • No. 3 clutch (C3) worn
        • No. 4 brake (B4) worn
        • No. 1 one-way clutch (F1) not operating properly
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