LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1155 (Automatic Transmission) >> Diagnosis And Testing >> Special Testing Procedures >> Engine Idle Speed Check >> Air Pressure Tests

Air Pressure Tests

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of Air Pressure Tests Ports
G03948555Courtesy of FORD MOTOR CO.

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 fluid 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 .
  2. Install the transmission test plate and gasket. Tighten bolts to 10 Nm (89 lb-in).
    3. NOTE: Do not apply air to the test plate vent hole.
  3. 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 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 .
AIR PRESSURE TEST DIAGNOSTIC CHART

Condition Possible Causes Actions
Dull thud heard or movement felt when air is applied and released Clutches, bands and fluid passages are OK. Concerns may not be in the transmission. Check the powertrain control module (PCM), wiring harness and non-transmission related components.
No drive Clutches and bands inoperative. Disassemble the transmission, clean and inspect to locate area of concern.
Erratic shifts Clutches and bands inoperative due to incorrect pressures. Disassemble the transmission, clean and inspect to locate area of concern.
No dull thud heard Clutches, bands and fluid passages may be damaged or obstructed. Disassemble the transmission, clean and inspect to locate area of concern.
No movement felt Clutches, bands and fluid passages may be damaged or obstructed. Disassemble the transmission, clean and inspect to locate area of concern.
Hissing sound heard Clutch seals or check ball may be damaged or leaking. Disassemble the transmission, clean and inspect to locate area of concern.
Servos do not operate Seals and pistons may be damaged. Supply and release ports may be obstructed. Spring may be broken. Disassemble the transmission, clean and inspect to locate area of concern.
Multiple clutches are applied Fluid passages in center support or clutch cylinders may be obstructed. Disassemble the transmission, clean and inspect to locate area of concern. Check fluid passages in the center support for obstructions.
scientia non olet · About LEMON Manuals