Air Pressure Test
| Item | Part Number | Description |
|---|---|---|
| 1 | - | Clutch (C) port |
| 2 | - | Clutch (D1) port |
| 3 | - | Clutch (D2) port |
| 4 | - | Direct clutch (B) port |
| 5 | - | Overdrive clutch (E) port |
| 6 | - | Forward clutch (A) port |
A no-drive condition can exist, even with correct transmission fluid pressure, because of inoperative clutches or bands. Refer to the Clutch 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 transmission range selector lever is in a forward gear range (D, 3, 2, 1), a no-drive condition may be caused by an inoperative forward clutch.
- Drain the transmission fluid. Remove the transmission fluid pan.
- Remove the filter and seal assembly and the mechatronics unit.
- The inoperative clutches can be located 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 may be heard.
- If the clutches fail to operate during the air check:
- the piston seals are not seated, damaged or not installed correctly.
- plugged feed holes for clutch apply in the case and/or clutch cylinder.
- damaged piston and/or clutch cylinder.
- Service as required and recheck.