Park Position

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Mechanical Operation 

Apply components:

• Park pawl engaged holding the park gear (output shaft) stationary
• Low/reverse clutch (D) applied

Planetary Gearset Operation 

Front planetary gearset driving components:

• Ring gear (input shaft)

Front planetary gearset driven components:

• Planetary carrier

Front planetary gearset held components:

• Sun gear (splined to pump assembly)

Rear planetary gearset driving components:

• None

Rear planetary gearset driven components:

• None

Rear planetary gearset held components:

• Planetary carrier
• Ring gear (output shaft)

Park Position Clutch Application Chart 

• H = Hold Clutch

For component information, refer to Mechanical Components and Functions .

Park Position Power Flow 

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Hydraulic Operation 

Line pressure hydraulic circuits:

• The position of the main regulator valve controls line pressure. The position of the main regulator valve is dependent on the pressure applied to it by the LPC solenoid through the VFS5 circuit.
• The main regulator valve varies pressure in the PUMP circuit by controlling hydraulic flow from the SCHG circuit into the pump suction circuit.
• Line pressure is supplied to the:
  • manual valve.
  • lubrication control valve.
  • converter release regulator valve.
  • bypass clutch control regulator valve.
  • solenoid pressure regulator valve.
  • D1 latch and regulator valves.

Torque converter circuits:

• When the TCC is released, the converter release regulator valve applies pressure to the torque converter through the CREL circuit to release the TCC.
• CREL pressure exits the torque converter through the CAPLY circuit to the bypass clutch control regulator valve.
• The bypass clutch control regulator valve directs the pressure from the CAPLY circuit back to the converter release regulator valve through the CAPLY EX circuit.
• The converter release regulator valve directs the pressure from the CAPLY EX circuit to the drain back valve through the DBACK circuit.

Cooler and lubrication hydraulic circuits:

• The lubrication control valve directs line pressure to the transmission fluid cooler or the thermal bypass valve through the COOLF circuit.
• When the transmission fluid exits the transmission fluid cooler or thermal bypass valve, it provides lubrication to the transmission through the LUBE circuit. For information about transmission lubrication, refer to Mechanical Components and Functions .

Solenoid hydraulic circuits:

• The solenoid pressure regulator valve supplies regulated line pressure to the shift, LPC and TCC solenoids through the SREG hydraulic circuit.
• The LPC solenoid applies varying pressure to the main regulator valve through the VFS5 hydraulic circuit. The LPC solenoid regulates line pressure by controlling the position of the main regulator valve.
• SSD supplies pressure to the solenoid multiplex valve through the VFS4 circuit.
• The position of the solenoid multiplex valve allows pressure from the VFS4 circuit to be directed to the D1 and D2 latch and regulator valves through the CL DC circuit to position the valves for low/reverse clutch (D) application.

Clutch hydraulic circuits:

• Line pressure is supplied by the pump to the D1 latch and regulator valves.
• Regulated line pressure from the D1 regulator valve is supplied to the low/reverse clutch (D) to apply the clutch.

For hydraulic circuit information, refer to Hydraulic Circuits .

Electrical Operation 

Solenoid operation:

Park Position Solenoid Operation Chart 

CB = Clutch brake

NC = Normally closed

NH = Normally high

NL = Normally low

For solenoid information, refer to Transmission Electronic Control System .

Courtesy of FORD MOTOR COMPANY

Courtesy of FORD MOTOR COMPANY