Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU2010OUTBACK SPORT F4-2.5L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTRANSMISSION CONTROL SYSTEMSTESTING AND INSPECTIONINITIAL INSPECTION AND DIAGNOSTIC OVERVIEWTIME LAG TEST
2010 Subaru Outback Sport F4-2.5L SOHC
Time Lag Test
2010 Subaru Outback Sport F4-2.5L SOHCSECTION Time Lag Test
Time Lag Test
INSPECTION
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. This is used for checking the condition of the low clutch, reverse clutch, low & reverse brake and one-way clutch.
^ Perform the test at normal operation fluid temperature of 70 - 80 degrees C (158 - 176 degrees 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 (NC OFF).
3) Shift the select lever from "N" to "D" range. Using a stop watch, measure the time which takes from shifting the lever until the shock is felt.
T1me-lag
Measurement value: 1.2 seconds or less
If "N" -> "D" time lag is longer than specified:
^ Line pressure too low
^ Low clutch worn
^ One-way clutch not operating properly
^ D-ring worn
4) In the same manner, measure the time lag of "N" -> "R".
T1me-lag
Measurement value: 1.5 seconds or less If "N" -> "R" time lag is longer than specified:
^ Line pressure too low
^ Reverse clutch worn
^ Low & reverse brake worn
^ D-ring worn
INSPECTION
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. This is used for checking the condition of the low clutch, reverse clutch, low & reverse brake and one-way clutch.
^ Perform the test at normal operation fluid temperature of 70 - 80 degrees C (158 - 176 degrees 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 (NC OFF).
3) Shift the select lever from "N" to "D" range. Using a stop watch, measure the time which takes from shifting the lever until the shock is felt.
T1me-lag
Measurement value: 1.2 seconds or less
If "N" -> "D" time lag is longer than specified:
^ Line pressure too low
^ Low clutch worn
^ One-way clutch not operating properly
^ D-ring worn
4) In the same manner, measure the time lag of "N" -> "R".
T1me-lag
Measurement value: 1.5 seconds or less If "N" -> "R" time lag is longer than specified:
^ Line pressure too low
^ Reverse clutch worn
^ Low & reverse brake worn
^ D-ring 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.