Air Pressure Tests: Notes

A "No Drive" condition can exist, even with correct transmission fluid pressure, due to inoperative clutches or bands. Inoperative units can be located through a series of checks by substituting air pressure for fluid pressure to determine location of malfunction.

To check unit, drain transmission fluid. Remove oil pan, gasket and control valve body. See VALVE BODY  removal procedure under ON-VEHICLE SERVICE. Using shop air, apply air to indicated points. See Fig 1. Check unit operation as follows.