Drive Range - Manual Third (From Overdrive Range Fourth Gear)

Drive Range - Manual Third (From Overdrive Fourth Gear):

DRIVE RANGE - MANUAL THIRD (From OVERDRIVE RANGE FOURTH GEAR)

"A" SHIFT SOLENOID - OFF
SECOND CLUTCH - APPLIED
1/2 SUPPORT ROLLER CLUTCH - OVERRUNNING
"B" SHIFT SOLENOID - OFF
THIRD CLUTCH - APPLIED
FORWARD BAND - APPLIED
INPUT CLUTCH - APPLIED
THIRD ROLLER CLUTCH - HOLDING

When the gear selector lever is moved to the DRIVE RANGE (D), the manual valve (404) allows line pressure to enter the D-3 passage. D-3 fluid is then directed to the 3-4 shift valve (362) and moves the valve against "A" shift solenoid pressure. D-3 fluid is also sent to the 2-3 shift valve (357) where it enters the input clutch feed passage. Input clutch feed fluid passes through the 3-4 shift valve (362) into the input clutch passage, seats #3 checkball (372) against the PRN passage and applies the input clutch. 4th clutch apply fluid at the 4th clutch, is directed through the 3-4 accumulator assembly (421-428) to the #10 checkball (372). Exhausting 4th clutch fluid seats the #10 checkball (372) against the 4th passage directing fluid through an exhaust orifice up to the 3-4 shift valve (362) where it exhausts. Since D-3 fluid overrides "A" shift solenoid fluid at the 3-4 shift valve (362), a manual 4-3 downshift will result even if "A" shift solenoid is "energized" or "turned on" (Drive range 4th gear solenoid state is "A" shift solenoid on and "B" shift solenoid off). If the PCM receives the appropriate input signals from the VS sensor and TP sensor, "A" shift solenoid will "de-energize or "turn off' and "A" shift solenoid fluid will then exhaust through the solenoid.

Manual Valve (404): Is moved by the gear selector lever and allowing line pressure to enter the D-3 passage.

2-3 Shift Valve (357): Allows D-3 fluid to enter the input clutch feed passage and directs it to the 3-4 shift valve (362).

3-4 Shift Valve (362): Is downshifted when D-3 fluid is fed to the valve. In this position input clutch feed fluid enters the input clutch passage.

#3 Checkball (372): Located in the channel plate (400), it is seated against the PRN passage allowing input clutch fluid to apply the input clutch.

#10 Checkball (372): Located in the valve body (300), it is seated against 4th fluid allowing 4th clutch fluid to exhaust at the 3-4 shift valve (362).

"A" Shift Solenoid (315): When de-energized, it allows "A" shift solenoid fluid from the 3-4 shift valve (362) to exhaust through the solenoid. However, this event does not have to occur in order to achieve a manual 4-3 downshift.