Time Lag Test: Inspection
WARNING: This page is about a different car, the 2019 Subaru Ascent. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
When the select lever is shifted while 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.
- Apply the parking brake.
- Start the engine and check the idling speed. (A/C OFF)
- Shift the select lever from "N" to "D" range, and using a stop watch, measure the time elapsed from shifting the lever until the shock is felt.
Specification:
1.2 seconds or less
If "N" → "D" time-lag is longer than standard:
- Secondary pressure too low
- Forward clutch worn
- Piston malfunction
- Control valve body malfunction
- Learning incomplete
- Shift the select lever from "N" to "R" range, and using a stop watch, measure the time elapsed from shifting the lever until the shock is felt.
Specification:
1.5 seconds or less
If "N" → "R" time-lag is longer than standard:
- Secondary pressure too low
- Reverse brake worn
- Piston malfunction
- Control valve body malfunction
- Learning incomplete