Air Pressure Tests

Special Testing Procedures

Air Pressure Tests

Air Pressure Test Port Locations









A no-drive condition can exist, even with correct transmission fluid pressure, because of inoperative clutches. Refer to the Clutch, Solenoid Application Chart 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.

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

1. Drain the transmission fluid and remove the transmission fluid pan.

2. Remove the transmission fluid filter and seal assembly, the solenoid body and solenoid to case gasket.

3. Install the Air Test Plate along with the Transmission Test Plate Screw Set.
- Tighten to 10 Nm (89 lb-in).

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 276 kPa (40 psi) of air pressure to the appropriate clutch port. 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 sound may be heard.

6. If the clutches fail to operate during the air check:
- inspect the transmission fluid passages in the case.

- the piston seals are not 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.