The Carman Scan VG is an advanced Automobile diagnistic tool from Korean manufacturer Nex-Tek. If Shift Solenoid 3 does not energize, or is stuck off, you will not achieve a 3-4 upshift.DecemCarman Scan VG, Windows powered Vehicle Diagnostics tool An updated retainer can be purchased from Ford, under part number F8DZ-7F194-AA. Note: The Forward Clutch Control Valve retainer may be bent or broken, which can cause the valve to stick. If the Forward Clutch Control Valve sticks in the up-shifted position, Forward Clutch oil will still be present at the 3-4 Shift Valve, preventing the 3-4 Shift Valve from moving, and preventing a 3-4 up-shift from taking place.ĬORRECTION: After all electrical systems have been checked and verified for proper operation, remove the Valve Body, check the Forward Clutch Control Valve for sticking, and for debris that may be obstructing the valve movement. At this time, the Forward Clutch Control Valve Should move to a down-shifted position, allowing the Forward Clutch oil to exhaust through the 3-4 Shift Valve, and through the exhaust passage through the downshifted Forward Clutch Control Valve. When the 2-3 up-shift takes place, SS3 is energized, which cuts off the SS3 oil to the Forward Clutch Control Valve, and the OD D 2 L Circuit oil to the Forward Clutch Control Valve is cut off by the movement of the 2-3 Shift Valve. Mainline Pressure from the OD D 2 L Circuit, passing through the 2-3 Shift Valve also acts upon the Forward Clutch Control Valve in First and Second Gear, to help keep the Forward Clutch Control Valve in an up-shifted position.
EXPLANATION: At engine start-up, SS3 oil pushes the Forward Clutch Control Valve into an up-shifted position, allowing Main Line pressure to pass through the “K”orifice, through the Forward Clutch Control Valve, through the 3-4 and 1-2 Shift Valves, and into the Forward Clutch. Also obd2 scanner for help.ĬAUSE: The cause may be, that the Forward Clutch Control Valve sticking in an up-shifted position. COMPLAINT: Ford Motor Company vehicles equipped with the AX4N Transaxle may exhibit a no fourth gear up-shift condition.
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