Air Pressure Test Diagnostic Chart

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

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 the center support or the 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.