B. First Range Operation

Valve routes fluid to C1 clutch. C3 clutch remains on with C1, resulting in Third range being attained for limp home capability. If reverse is selected, the selector valve directs fluid through the TCC Valve and SV2 to C5 clutch. C3 clutch remains on with C5 clutch, resulting in reverse range being attained.

B. Hydraulic Circuit—First Range (Foldout 5) • When the selector lever is moved from N (Neutral) to D (Drive), the transmission shifts from neutral) to first range operation. SS1, SS2, and SS3 remain energized. PCS1 and TCC solenoid remain de-energized • SV1, SV2, and SV3 stay in the stroked position. With normally closed PCS1 deenergized, PCV1 continues to supply full control pressure through SV2 to C5 clutch, keeping the clutch applied. During the shift, PCS2 energizes, blocking the exhaust of the PCS2 signal pressure, causing the pressure to rise. The PCS2 signal pressure strokes PCV2, opening PCV2 pressure port to main pressure. PCS2 pressure is directed through SV1, SV3, and the Manual Selector Valve to C1 clutch, applying the C1 clutch. The TCM provides current to PCS2, which controls the rate of pressure buildup of the C1 clutch, assuring a smooth transition to first range. The combination of C1 and C5 clutch application produces first range operation. • After the shift to first range is complete, SS3 is de-energized followed closely by SS1 (timed to prevent SS3 from becoming “latched” down), allowing both valves to destroke. PCS2 is also de-energized, exhausting PCS2 signal pressure, allowing PCV2 to destroke which exhausts PCS2 pressure. In its de-stroked position, SV3 routes main pressure to the Manual Selector Valve which directs the main pressure to C1 clutch, keeping C1 clutch applied. With C1 and C5 clutches applied, the transmission stays in first range. • Control main pressure exhaust for PS2 is blocked by SV2, keeping the switch turned on and providing feedback to the TCM that SV2 is stroked. With SV1 in its de-stroked position, the pressure feed to PS1 is eliminated and with the pressure exhausted, the pressure switch turns off, providing feedback that SV1 is in the de-stroked position. With SV3 destroked, the control main pressure to PS3 is exhausted and PS3 turns off, providing feedback that SV3 is in the de-stroked position.

• If electrical power is interrupted while the transmission is in first range, SS2 is deenergized. Normally closed PCS1 continues to block the exhaust of PCS1 signal pressure (signal pressure remains control main) which results in maximum PCS1 pressure being maintained. PCS1 pressure continues to be directed to SV2, which stays stroked due to the “latching” effect of pressure on two different diameter lands and fluid continues to be directed to C5 clutch, keeping C5 clutch applied. Main pressure continues to be directed through SV3 and Manual Selector

Valve to C1 clutch, keeping C1 clutch applied.

The combination of C1 and C5 clutch application allows the transmission to stay in first range for limp home capability.

• If electrical power is interrupted while the transmission is in first range, moving the

Manual Selector Valve to neutral will cut off main pressure to C1 clutch and the clutch will be exhausted. C5 clutch remains applied.

Because only one clutch is applied, the transmission goes to neutral.

• If electrical power is interrupted while the transmission is in first range, moving the

Manual Selector Valve to reverse cuts off main pressure to C1 clutch, exhausting C1 clutch.

The Manual Selector Valve directs main pressure through the TCC valve to the bottom of SV2, de-stroking the valve and opening the path for main pressure to feed C5 clutch, keeping the clutch applied. PCS1 control pressure is then directed to C3 clutch, applying the clutch. The combination of C3 and C5 clutch application produces reverse range operation, for limp home capability.