302 Automatic Transmissions and Transaxles Copyright by Goodheart-Willcox Co., Inc. Figure 12-45. Overdrive range, fourth gear. The torque converter clutch is applied. Compare solenoid operation with that in earlier gears. (Ford) Fourth Gear Hydraulic Flow – D Range, Converter clutch released Reverse clutch Inter clutch Forward clutch Direct clutch Manual low relief 1XX 1XX BB B2 B9 L34 K PRNDL D OD D L DL Pump B1 A Rev Manual Pump Filter Sump P HH Conv. reg. sol. reg. Pump UU BB AA TT L234 KK Bypass cl sol VFS TV sol. P1 L34XX 1XX Q BBB P2 2-3 shift OD D L P2′ DCX L234 B6 LISR T B10 SF P1 Sol. #1 ON (N.O.) Sol. #2 OFF (N.O.) Sol. #3 ON (N.O.) P3 P2 DD Rear B3 Rel. Apply L/I servo OD D L 2-3 servo reg. GG Engagement LISA P2 Pull in 3-2 shift timing DCX L Pump Fwd. clutch control P3 LFC 3-4 shift J OD D L Int. clutch shuttle R ICEX P2′ 1-2 shift M L L3 L234 L34XX FC Rev L4 Rev L 12 L LL DCEX P2 PP LISR LI2X L234 L12 L Rev L12 B5 DL B F B11 L34XX ICEX L12 S E L12X TV VFS L L4 Pressure failsafe Backout E V (opt) Accum. reg U ZZ FF MM Pump NN (opt) LFC C Int. cl L234 VV Y CC PC Main reg. TV Rev CPY L Z Bypass clutch control C-BY 1-2 cap mod. 12 acc. L4 B4 H O.D. servo N-D accum. X L12X 3-4 accum. ODSA 1-2 accum. Converter C-BY CT CI W F. lube Cooler Converter drain back YY Diff. = Line = Pump control = TV = Converter feed, case lube = Accumulator charge To downshift back to third gear, the ECM de-energizes the solenoid. Pressure drops at the 3-4 shift valves, and it returns to the downshifted position. Oil pressure is removed from the overdrive clutch, causing it to disengage. The transmission returns to third gear. CVT Pulley Controls All CVTs are electronically controlled. Figure 12-48 illustrates the electronic control system for a typical CVT. The ratio control motor or ratio control solenoid receives DCX L4S L24 L234 L12 Rev L3 L4 CT CL