Air Pressure Tests

Air Pressure Tests

Air Pressure Test Port Locations:

A no-drive condition can exist even with correct transmission fluid pressure, because of inoperative clutches or bands. Refer to the Band, Clutch, Solenoid Application Charts to determine the appropriate elements. A clutch concern can be located through a series, of checks by substituting air pressure for fluid pressure to determine the location of the concern. Test A: Control Solenoids

Example: When the transmission range selector lever is in a forward gear range ((D), 2, 1), a no-drive condition may be caused by an inoperative forward clutch.

1. Drain the transmission fluid. Remove the transmission fluid pan.
2. Remove the filter and seal assembly, the solenoid body, the control assemblies and separator plate, upper/lower gaskets.
3. Install the special tool.

^ Tighten to 10 Nm (89 inch lbs.).

4. The inoperative clutches can be located by applying air pressure into the appropriate clutch port. See the Air Pressure Test Port Locations illustration for clutch port locations.
5. Apply air pressure to the appropriate clutch port (see the Air Pressure Test Port Locations illustration). A dull thud may be heard or movement felt when a clutch piston is, applied. If the clutch seals or check ball are leaking, a hissing may be heard.
6. If the clutches fail to operate during the air check:
^ inspect the fluid passages in the case.
^ the piston seals are riot seated, not installed or are damaged.
^ plugged feed holes for clutch apply in the case and/or clutch cylinder.
^ damaged piston and/or clutch cylinder.

7. Repair as required and recheck.
8. Reinstall all components.