Air Pressure Test
WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
| Item | Description |
|---|---|
| 1 | Intermediate clutch (C) port |
| 2 | Low/reverse clutch (D1) port |
| 3 | Not used |
| 4 | Direct clutch (B) port |
| 5 | Overdrive clutch (E) port |
| 6 | Forward clutch (A) port |
| 7 | Thermal bypass valve (model dependent) |
| A no-drive condition can exist even with correct transmission fluid pressure because of inoperative clutches. Refer to the Clutch Application Chart to determine which clutch is applied in each gear range. 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 clutch.
- Drain the transmission fluid. Remove the transmission fluid pan.
- Remove the transmission fluid filter, seal assembly and the main control unit.
- Locate the inoperative clutches by applying air pressure into the appropriate clutch port.
- Apply 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.
- If the clutches fail to operate during the air check:
- the piston seals are not seated, damaged or installed incorrectly.
- plugged feed holes for clutch apply in the case and/or clutch cylinder.
- damaged piston and/or clutch cylinder.
- Service as required and recheck.