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.
- Apply the parking brake.
- Start the engine. Check the idle speed. (A/C OFF)
- 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
- 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