Time Lag Test - Subaru 2009 IMPREZA Service Manual

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6. Time Lag Test

A: INSPECTION

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

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.

Measurement value: 1.2 seconds or less

"D" time lag is longer than specified:

• Line pressure too low

• Low clutch worn

• One-way clutch not operating properly

• D-ring worn

4) In the same manner, measure the time lag of "N"

Measurement value: 1.5 seconds or less

"R" time lag is longer than specified:

• Line pressure too low

• Reverse clutch worn

• Low & reverse brake worn

• D-ring worn

Time Lag Test

AUTOMATIC TRANSMISSION