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, refer to Pinpoint Tests - OSC Equipped Vehicle or Specifications 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. Pinpoint Tests - OSC Equipped Vehicle

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.

CAUTION: Use 172 kPa (25 psi) of air pressure when verifying clutch operation. Use of excessive air pressure may damage or roll bonded lip seals resulting in a loss of clutch function.

1. Drain the transmission fluid. Remove the transmission fluid pan.
2. Remove the filter and seal assembly, the solenoid body and solenoid-to-case gasket.
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. Refer to the Air Pressure Test Port Locations illustration for clutch port locations.
5. Apply air pressure to the appropriate clutch port (refer to 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 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.