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View and Download AOpen AX4S-U manual online. AOpen motherboar. AX4S-U regular BIOS code should be in place and the problem resolved. 1. 1. Since the introduction of the Ford AXOD transaxle in model year , there We have included the changes on the AX4S transaxle up through and including Trouble Code (DTC) (MLUS Shorted or Open Circuit), DTC (EPC. Desensamble de Transmision AXODE - AX4S. amigo tengo un problema con una wuistar ax4n empaque Missing: AOPEN.

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The transmission AOPEN AX4S-UN has a bolt pan on the bottom, which is different from the bolt pan used on the newer AX4N transmission that replaced AOPEN AX4S-UN AX4S in on the Windstar. According to the Center for Auto Safetythe failure rate for these transmissions has been significantly higher than that for most other automatic transmissions.

Ford AX4S Transmission Problem

The AX4S transmission in my Windstar failed at 60, miles, AOPEN AX4S-UN transmission in my Windstar failed at 86, miles. I should also mention that I have also owned two Chrysler minivans, and the AOPEN AX4S-UN in both of those also failed at relatively low mileage.

The high failure rate has been blamed on inadequate internal lubrication of critical parts, and a weak forward clutch piston that cracks AOPEN AX4S-UN leaks pressure. Ford scrimped on the forward clutch piston, making it out of cast aluminum untilwhen they switched to a steel part due to all the trouble they AOPEN AX4S-UN having with this transmission. Ford TSB covers replacement of this piston with a stronger steel piston.

AOPEN AX4S-UN Drivers Update

Ford has so much trouble with the earlier versions of this transmission that in it extended the warranty on Taurus transmissions to six years or 60, miles. That's ancient AOPEN AX4S-UN now, and the Windstar transmissions were only covered by the standard powertrain warranty. The operation of the planetary AOPEN AX4S-UN is controlled by four multiple-plate clutches, two band assemblies and two overrunning clutches. Hydraulic pressure is provided by a variable displacement pump driven by the torque converter.

The transaxle has a large chain drive on the driver side end under the cover with AXOD stamped on it. There is also a thermostatic fluid control valve inside the transmission that compensates for AOPEN AX4S-UN expansion as the fluid gets hot.

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When the fluid is cold, it routes more fluid to the main control body. As the fluid heats, up the valve slowly opens to allow some of the fluid to drain back to the sump. This helps keep the fluid level below the rotating parts of the transmission so it doesn't foam and become aerated which can cause erratic transmission performance.

For normal driving, leave the transmission in overdrive. AOPEN AX4S-UN will prevent AOPEN AX4S-UN torque converter from locking up or the transmission from going into 4th gear while driving.

AOPEN AX4S-UN Drivers for Windows 10

This increases available AOPEN AX4S-UN but also reduces fuel economy. If the overdrive light is flashing, it means the PCM has detected an internal electronic fault in the transmission.

AOPEN AX4S-UN Driver Windows

AOPEN AX4S-UN Some people call this the "sell or trade this vehicle now" light because it usually means the transmission is failing. Turbine Shaft Speed Sensor.

The computer uses this information to control torque converter clutch lockup and internal transmission operating pressures. This signal is also used to control the torque converter clutch, gear shifting and internal pressure. AOPEN AX4S-UN

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The solenoids are located in AOPEN AX4S-UN main control valve body, and are two-way, normally open solenoids. The PCM uses fluid temeprature to modify the shift characteristics of the transmission when it is cold.

The Electronic Pressure Control EPC Solenoid controls the hydraulic pressure inside the transmission by balancing the line pressure against the modulator pressure. The PCM has an adaptive strategy that allows it to modify the shift characteristics over time for smoother operation. If the battery is disconnected, these learned settings go away and the AOPEN AX4S-UN has to start all over again, AOPEN AX4S-UN may cause harsher shifts for several hundred miles until the PCM sorts things out again.

Problems here can make the transmission feel jerky at low speed if the torque converter locks up too soon or fails to release soon enough, AOPEN AX4S-UN cause a drop in AOPEN AX4S-UN economy if the converter never locks up. The transmission will downshift to a lower gear when the vehicle is slowing down, when an increase in the load on the transmission requires a higher gear ratio as when driving up a AOPEN AX4S-UN hillor when the accelerator pedal is floored kickdown.

If the transmission downshifts harshly gong from 3rd to 2nd gear, or shudders when accelerating around a corner, the problem may be air in the transmission fluid caused by a low fluid level.

Ford TSB covers this problem and says the fix is to check the fluid level after the vehicle has been AOPEN AX4S-UN, the fluid is AOPEN AX4S-UN, and the AOPEN AX4S-UN is idling in Parkand add fluid as necessary to bring the fluid level up to the full mark. Always refer to your owner's manual or the marks on the dipstick for the type of fluid to use. Starting inall Taurus and Sable vehicles require the newer Mercon V fluid.

Ford warns that using wrong fluid or a fluid that does not meet their Mercon or Mercon V specifications can cause transmission problems and possible transmission failure.

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