Time Lag Test: Inspection

2014 Subaru Outback 2.5i, Standard TransSECTION Inspection
WARNING: This page is about a different variant/trim than selected.
NOTE: When the select lever is shifted while the engine is idling, there will be a certain time elapse or lag before shock is felt. Using this, check the condition of forward brake, reverse brake, 1st one-way clutch and 3rd one-way clutch.
  • Perform the test at normal operation fluid temperature of 70 - 80°C (158 - 176°F).
  • Be sure to allow one minute or more interval between tests.
  • Make three measurements and take the average value.
  1. Fully apply the parking brake.
  2. Start the engine. Check the idle speed. (A/C OFF)
  3. Shift the select lever from "N" to "D" range. Using a stop watch, measure the time-lag from shifting the lever until the shock is felt.

    Time-lag 

    Standard: 1.2 seconds or less 

    If "N" → "D" time-lag is longer than specification:

    • Line pressure too low
    • Forward brake worn
    • One-way clutch not operating properly
  4. In the same manner, measure the time lag of "N" → "R".

    Time-lag 

    Standard: 1.5 seconds or less 

    If "N" → "R" time lag is longer than specification:

    • Line pressure too low
    • Reverse brake worn
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.