Reverse

Reverse:

REVERSE

When the gear selector lever is moved to the Reverse (R) position, the following changes to the hydraulic and electrical systems in the transaxle occur:

PRESSURE REGULATION

Manual Valve: When mechanically moved by the gear selector lever, it directs line pressure through the PRND4 fluid passage into the reverse circuit. Reverse fluid is then routed to the pressure regulator valve and to the reverse orifice bypass valve. Reverse fluid then passes through orifice #6, it seats checkball #7 and then is routed to the 1-2 shift valve.

Pressure Switch: Line fluid pressure activates the reverse, PRND4 and PRND43 pressure switches to complete their circuits (providing a ground). The sequence of open and closed switches provides the input data to the PCM indicating the manual valve position.

Pressure Regulator Valve: Reverse fluid pressure combines with torque signal fluid to increase hydraulic pressure in the line circuit. Increases (or decreases) in line pressure is primarily influenced by changes in the throttle position as a result of the changing operating conditions of the vehicle.

REVERSE CLUTCH APPLIES

Reverse Orifice (Bypass) Valve: Held closed by spring force, it opens under high pressure and routes reverse fluid through orifice #17 into the reverse clutch circuit. The function of this valve is to provide an additional feed into the reverse clutch circuit in order to quickly apply and hold the reverse clutch.

#7 Checkball (Reverse/Reverse Clutch): Located in the valve body, it is seated against the spacer plate to force reverse fluid through orifice #12 before it enters the reverse clutch circuit.

1-2 Shift Valve: Operating in the downshifted position, it allows orificed PRN fluid to enter the lo/reverse band apply fluid passage. Lo/reverse band apply fluid is then routed to checkball #6.

#6 Checkball (Lo & Reverse Band Apply/Reduce): Located in the valve body, it is seated against the lo & reverse band reduce passage and routes fluid into the lo & reverse band apply circuit. Lo/reverse band apply is then routed to the lo/reverse servo piston and actuates the piston.

#4 Checkball (Reverse Clutch): Located in the accumulator housing, it is unseated by reverse clutch fluid thereby allowing reverse clutch pressure to actuate the reverse accumulator piston.

Reverse Accumulator Assembly: Primary accumulator fluid on the spring side of the reverse accumulator piston is forced back through its circuit to the 1-2 & 3-4 accumulator valve. The 1-2 & 3-4 accumulator valve then regulates the exhaust of primary accumulator fluid.

TORQUE CONVERTER/COOLER & LUBE

Pressure Regulator Valve: Line pressure at the valve enters the converter feed circuit which is then routed to the converter clutch feed limit valve. Converter feed passes through the valve and enters the Torque Converter Clutch (TCC) feed limit circuit. TCC feed limit is then routed through orifice #29 and enters the orificed feed limit passage. TCC feed limit is also routed to the TCC enable valve and the converter clutch control valve.

TCC Enable Valve: Meld in the downshifted position by spring force, it allows TCC feed limit to pass through the valve and enter the orificed TCC exhaust enable circuit. Orificed TCC exhaust enable fluid is then routed to the converter clutch control valve.

Converter Clutch Control Valve: Held in the downshifted position by spring force, orificed TCC exhaust enable fluid is routed to the spring end of the valve and through orifice #35 (where it enters the TCC exhaust enable circuit). At the same time, TCC feed limit is routed through the valve and enters the converter release circuit.

Torque Converter: Converter release fluid is routed to the cover side of the TCC pressure plate and keeps the pressure plate in the released position. Converter release passes around the plate and enters the converter apply circuit which is routed back to the converter clutch control valve.

Converter Clutch Control Valve: Converter apply fluid is routed through the valve and enters the "to cooler" circuit. To cooler fluid is then routed through the transaxle cooler and into the lube circuits throughout the transaxle.