Subaru Legacy BN/BS (2015-2019) Service Manual: Time lag test inspection

Subaru Legacy BN/BS (2015-2019) Service Manual / Continuously variable transmission(tr580) / 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 symptom helps to check the condition of forward clutch and reverse brake.

• Perform the test at normal operation CVTF temperature of 60 — 80°C (140 — 176°F).

• Be sure to allow one minute or more interval between tests.

• Make three measurements and take the average value.

1. 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 elapsed from shifting the lever until the shock is felt.

Time lag standard:

1.5 seconds or less

If “N” > “D” time lag is longer than specified:

• Secondary pressure (line pressure) is too low.

• Forward clutch worn

• Forward clutch piston malfunction

• Control valve body malfunction

• Learning incomplete

4. In the same manner, measure the time lag when shifting from “N” range to “R” range.

Time lag standard:

1.5 seconds or less

If “N” > “R” time lag is longer than specified:

• Secondary pressure (line pressure) is too low.

• Reverse brake worn

• Reverse brake piston malfunction

• Control valve body malfunction

• Learning incomplete

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