Subaru IMPREZA GD 2007 Series Manual page 2540

asieps_tobira_IM_US.book 33 ページ ２０１２年１月１７日 火曜日 午後３時４８分
Time Lag Test
AUTOMATIC TRANSMISSION
6. Time Lag Test
A: INSPECTION
NOTE:
When the select lever is shifted while the engine is
idling, there will be a certain time elapse or lag be-
fore shock is felt. This is used for checking the con-
dition of the low clutch, reverse clutch, low &
reverse brake and one-way clutch.
• Perform the test at normal operation fluid tem-
perature of 70 — 80°C (158 — 176°F).
• Be sure to allow one minute or more interval be-
tween 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: 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
• Low clutch D-ring worn
4) In the same manner, measure the time lag of "N"
→ "R".
Time lag: 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
• Reverse clutch D-ring worn
4AT-33