Air Pressure Tests

Special Testing Procedures

Air Pressure Tests










A no-drive or erratic shift condition may be due to inoperative bands and clutches. To diagnose these conditions a series of checks can be made by substituting air pressure for transmission fluid pressure to determine the location of the damaged or obstructed component.

Follow the procedure to determine the location of the inoperative clutch or band by substituting air pressure into the various test plate passages.

NOTE: Use only dry, regulated air pressure, 276 kPa (40 psi) maximum.

1. Remove the main control valve body. Refer to Main Control Valve Body Main Control Valve Body.

2. Install the Transmission Air Test Plate and Gasket. Tighten bolts to 10 Nm (89 lb-in).

3. NOTE: Do not apply air to the test plate vent hole.

Apply air to the appropriate clutch or servo port (refer to plate layout diagram). Refer to the Air Pressure Test Diagnostic Chart for conditions, possible causes and actions.

4. After the testing is completed, remove the Transmission Air Test Plate and Gasket and proceed with any repairs that are needed.

5. After the repairs are completed, install the main control valve body. Refer to Main Control Valve Body Main Control Valve Body.

Air Pressure Test Diagnostic Chart