Time Lag Test - Subaru IMPREZA 2002 Service Manual

I
AUTOMATIC TRANSMISSION
TIME LAG TEST
6. Time
Lag Test
A: INSPECTION
1. GENERAL INFORMATION
If the select lever is shifted while the engine is
idling, there will be a certain time elapse or lag be-
fore the shock can be felt. This is used for checking
the condition of the low clutch, reverse clutch, low &
reverse brake and one-way clutch.
CAUTION:
Perform the test at normal operation fluid
temperature 60 to 80°C (140 to 176°F).
Be sure to allow a one minute interval be-
tween tests.
Make three measurements and take the aver-
age value.
2. TEST METHODS
1) Fully apply the parking brake.
3) Check the idling speed (NC OFF).
4) Shift the select lever from "N" to
"D" range.
Using a stop watch, measure the time it takes from
shifting the lever until the shock is felt.
Time lag: Less than 1.2 seconds
5 ) In the same manner, measure the time lag for
"N"
+
"R".
Time lag: Less than 1.5 seconds
3. EVALUATION
1) If "N"
+
'ID time lag is longer than specified:
Line pressure too low
Low clutch worn
One-way clutch not operating properly
2) If "N"
+
"R" time lag is longer than specified:
Line pressure too low
Reverse clutch worn
Low & reverse brake worn
- 2 . )
Start the engine.
AT-I 5