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 MANUALSSUBARU2007FORESTER F4-2.5L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTRANSMISSION CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSTIME LAG TEST
2007 Subaru Forester F4-2.5L SOHC
Time Lag Test
2007 Subaru Forester 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°C (158 - 176°F).
^ Be sure to allow a one minute 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 which takes from shifting the lever until the shock is felt.
Time lag: Less than 1.2 seconds.
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".
Time lag: Less than 1.5 seconds. 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°C (158 - 176°F).
^ Be sure to allow a one minute 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 which takes from shifting the lever until the shock is felt.
Time lag: Less than 1.2 seconds.
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".
Time lag: Less than 1.5 seconds. 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.