Time Lag Test

NOTE: This test checks general condition of the overdrive clutch, forward clutch, rear clutch and first/reverse brake. Condition is indicated by the amount of time required for clutch/brake engagement with the engine at curb idle speed. Engagement time is measured for D and Reverse positions. A stop watch is recommended for test accuracy.

Test Procedure


Check and adjust transmission fluid level if necessary.


Bring the transmission to normal (hot) operating temperature.


Apply the parking brakes.


Turn off the air conditioning unit.


On 4WD models, shift the transfer case into two-wheel high.


Start the engine and check curb idle speed. Adjust speed if necessary. Curb idle must be correct to ensure accurate test results.


Shift the transmission into Neutral and set the stop watch.


NOTE: During the following test steps, start the stop watch as soon as the shift lever reaches the D and Reverse detents.


Shift the transmission into D range and record the time it takes for engagement. Repeat the test two more times.


Reset the stop watch and shift the transmission back to Neutral.


Shift the transmission into Reverse and record the time it takes for engagement. Repeat the test two more times.


Engagement time in D range should be a maximum of 1.2 seconds. Engagement time for Reverse should be a maximum of 1.5 seconds.


Time Lag Test Analysis


If engagement time is longer than specified for D range, check for the following:


Shift linkage misadjusted.


Line pressure low.


Forward clutch worn.


Overdrive clutch worn or damaged.


If engagement time is longer than specified for Reverse, check for the following:

Shift linkage misadjusted.


Line pressure low.


Direct clutch worn.


First/reverse brake worn.


Overdrive clutch worn or damaged.