G. Fifth Range Operation

G. Hydraulic Circuit—Fifth Range (Foldout 9)

• Before making a shift from fourth to fifth range, the TCM makes certain all of the shift valves are in the correct position with SV1 and

SV3 stroked and SV2 de-stroked.

• PCS2 is de-energized, exhausting PCS2 signal pressure and the PCV2 valve de-strokes, which allows C1 clutch to exhaust through the

Manual Selector Valve, SV3 and SV1 and

PCV2. PCS1 is de-energized, raising the

PCS1 signal and PCV1 pressures. PCS1 pressure is directed through SV2 to C3 clutch, applying the clutch. The TCM reduces the current to PCS1, which controls the rate at which PCV1 supplies pressure to C3 clutch, and reduces the current to PCS2, which controls the rate at which PCV2 exhausts C1 clutch, assuring a smooth transition from fourth to fifth range. C2 clutch continues to be applied by main pressure flowing through

SV3, SV2, and the Manual Selector Valve.

• The combination of C2 and C3 clutch application produces fifth range operation.

• PS1 and PS2 are turned off, providing feedback that SV1 and SV2 are in their destroked position, and PS3 remains on, providing feedback that SV3 is in its stroked position.

• If electrical power is interrupted while the transmission is in fifth range, PCS2, SS3, and

TCC solenoid (if TCC is applied) de-energize.

Although SS3 no longer supplies control main pressure to the top of SV3, control main pressure flows through SV1 to the top of SV3, keeping the valve stroked. Normally closed

PCS1 continues to block the exhaust of the signal pressure (signal remains control main).

The signal pressure on top of PCV1 produces maximum control pressure, which is routed through SV2 to C3 clutch, keeping the clutch applied. Main pressure feeds through SV3 and

SV2 and the Manual Selector Valve to C2 clutch, keeping the clutch applied. • The combination of C2 and C3 clutch application produces fifth range operation for limp home capability.

• If the TCC is applied, the TCC solenoid deenergizes, causing the TCC pressure control valve to de-stroke, exhausting pressure from the top of the Converter Flow Valve. The

Converter Flow Valve de-strokes, redirecting main overage to converter in and converter out flow to the cooler. The TCC is now released.

• If electrical power is interrupted while the transmission is in fifth range (causing fifth range converter operation) and the Manual

Selector Valve is moved to neutral, C2 clutch exhausts through the Manual Selector Valve to exhaust backfill, releasing C2 clutch. C3 clutch remains applied. With only one clutch applied, the transmission goes to neutral.

• If electrical power is interrupted while the transmission is in fifth range, (fifth range converter operation) and the Manual Selector

Valve is moved to reverse, C2 clutch exhausts through the Manual Selector Valve, releasing the clutch. C3 clutch remains applied. With only one clutch applied, the transmission goes to neutral.

• If electrical power is interrupted while the transmission is in fifth range, resulting in only fifth and neutral operation, the engine may be shut down and restarted to attain neutral, third and reverse operation (refer to paragraph A—

Neutral).

H. Hydraulic Circuit—Sixth Range (Foldout 10) • Before making a shift from fifth to sixth range, the TCM makes certain that all shift valves are in the correct position. SS1 and SS2 are electrically off and SV1 and SV2 are in the de-stroked position. SS3 is electrically on and SV3 is in the stroked position. • PCS1 is energized, opening PCS1 pressure to exhaust, which allows PCV3 to de-stroke, exhausting C3 pressure and releasing the C3 clutch. PCS2 is energized, raising the PCS2