Air Pressure Test

AIR PRESSURE TEST

NOTE: A no drive condition can exist, even with correct transmission fluid pressure, because of inoperative clutches or bands. An erratic shift can be located through a series of checks by substituting air pressure for fluid pressure. When the selector is in a forward gear, a no drive condition may be caused by an inoperative forward clutch, overdrive one-way clutch, or low-reverse one-way clutch. A no manual low (first) coast condition could be caused by an inoperative coast clutch or reverse clutch. Failure to go into Reverse could be caused by a malfunction of the reverse clutch, overdrive one-way clutch, or direct clutch.

1. Drain transmission fluid and remove oil pan.
2. Remove filter and seal assembly, solenoid body, and main control assemblies.

Air Pressure Check Locations:

3. Inoperative clutches can be located by introducing air pressure into various test passages.

Clutch/Band Application Chart:

4. A dull thud can be heard or movement of piston felt when clutch piston is applied. Refer to the Clutch/Band Application Chart.
5. If clutch seals are leaking, a hissing sound will be heard.