AUTOMATIC TRANSMISSION(4AT) > 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 is used for checking the condition of the low clutch, reverse clutch, low & reverse brake and one-way clutch.

• Perform the test at normal operation fluid temperature of 70 — 80°C (158 — 176°F).

• Be sure to allow a one minute or more interval between tests.

• Make three measurements and take the average value.

1. Fully apply the parking brake.

2. Start the engine.

Check the idling 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

• 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

• D-ring worn