OVERDRIVE MANUAL ROLLER FORWARD DIRECT 2-1 CLUTCH CLUTCH CLUTCH BAND
INTER. SPRAG CLUTCH
(Engine Running) INTER. CLUTCH
LOW ROLLER CLUTCH
LOW & REV BAND
4
HOLDING
FLUID PRESSURE DIRECTED IN PREPARATION FOR A SHIFT 1
2
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Manual Valve: Mechanically controlled by the gear selector lever, the manual valve is in the Park (P) position and directs line pressure from the pressure regulator valve into the PRN, PRND4 and PRND43 fluid circuits.
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AMANUAL 2-1 B FBAND SERVO
(55 – 60) ➤
Transmission Fluid Pressure (TFP) Manual Valve Position Switch: PRND4 and PRND43 fluids at the TFP manual valve position switch signal the powertrain control module (PCM) that the transmission is in either Park or Neutral range. The PCM then energizes, or “turns ON” the 1-2 shift solenoid valve and keeps the 2-3 shift solenoid valve de-energized.
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X E ➤
Refer to Shift Solenoid Valves on page 43 for a description of solenoid and shift valve operation.
Note:
N R P
2-3 Shift Valve: PRND4 fluid is also sent from the manual valve to the 2-3 shift valve where it stops.
RN D
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D
2
E S R E V E R
E V I R D
➤ 4 3 4 E D D N N N I R R L P P
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1 1 2 O 2 L 3 D D
FILTER (317) E B U L R LUBE A E PIPE R
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1
5
AIR BLEED (210)
Manual 2-1 Band Servo: PRND43 fluid is also sent to the manual 2-1 band servo assembly. At the manual 2-1 band servo, PRND43 fluid pressure assists manual 2-1 band servo piston spring force to keep the manual 2-1 band released.
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FILTERED ACTUATOR FEED
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20 ➤
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PRND43
PRESSURE TAP (24)
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3-4 Shift Valve: PRN fluid is routed to the 3-4 shift valve where it assists 3-4 shift valve return spring force and actuator feed fluid pressure to keep the valve in the downshifted position. PRN fluid is also routed to the 2-3 shift valve where it assists 2-3 shift valve return spring force and actuator feed fluid pressure to keep the valve in the downshifted position.
