Part 3
Transmission Operation
Transmission Operation Overview
5th Gear
Mechanical Operation
Apply components:
- Overdrive clutch (E) applied
- Direct clutch (B) applied
Planetary Gearset Operation
Front planetary gearset driving components:
- Ring gear (input shaft)
Front planetary gearset driven components:
- Planetary carrier
Front planetary gearset held components:
- Sun gear (splined to pump assembly)
Rear planetary gearset driving components:
- No. 2 sun gear
- Planetary carrier
Rear planetary gearset driven components:
- Ring gear (output shaft)
Rear planetary gearset held components:
- None
5th Gear Clutch Application Chart
- D = Drive Clutch
- O/R = Overrunning
For component information, refer to Mechanical Components and Functions Mechanical Components and Functions.
Power Flow
Hydraulic Operation
Line pressure hydraulic circuits:
- The position of the main regulator valve controls line pressure. The position of the main regulator valve is dependent on the pressure applied to it by the LPC solenoid through the VFS5 circuit.
- The main regulator valve varies pressure in the PUMP circuit by controlling hydraulic flow from the SCHG circuit into the pump suction circuit.
- Line pressure is supplied to the:
- manual valve.
- lubrication control valve.
- converter release regulator valve.
- bypass clutch control regulator valve.
- solenoid pressure regulator valve.
- D1 latch and regulator valves.
- In drive, the manual valve directs line pressure to the No. 1 shuttle valve and clutch A, C and E regulator valves.
- The No. 1 shuttle ball directs line pressure to the clutch B regulator valve.
Torque converter circuits:
- When the TCC is released, the converter release regulator valve applies pressure to the torque converter through the CREL circuit to release the TCC.
- CREL pressure exits the torque converter through the CAPLY circuit to the bypass clutch control regulator valve.
- The bypass clutch control regulator valve directs the pressure from the CAPLY circuit back to the converter release regulator valve through the CAPLY EX circuit.
- The converter release regulator valve directs the pressure from the CAPLY EX circuit to the drain back valve through the DBACK circuit.
Cooler and lubrication hydraulic circuits:
- The lubrication control valve directs line pressure to the transmission fluid cooler or the thermal bypass valve through the COOLF circuit.
- When the transmission fluid exits the transmission fluid cooler or thermal bypass valve, it provides lubrication to the transmission through the LUBE circuit. For information about transmission lubrication, refer to Mechanical Components and Functions Mechanical Components and Functions.
Solenoid hydraulic circuits:
- The solenoid pressure regulator valve supplies regulated line pressure to the shift, LPC and TCC solenoid through the SREG hydraulic circuit.
- The PCA applies varying pressure to the main regulator valve through the VFS5 hydraulic circuit. LPC solenoid regulates line pressure by controlling the position of the main regulator valve.
- SSB supplies pressure to the clutch B regulator valve to position the valve for direct clutch (B) application.
- SSD supplies pressure to the solenoid multiplex valve through the VFS4 circuit.
- SSE supplies pressure to the solenoid multiplex valve and the drive enable valve through the SS1 circuit to move the valves.
- The position of the solenoid multiplex valve and the drive enable valve allows pressure from the VFS4 circuit to be directed to the clutch E latch and regulator valves through the CLEC circuit to position the valves for overdrive clutch (E) application.
Clutch hydraulic circuits:
- Regulated line pressure from the clutch B regulator valve is supplied to the direct clutch (B) to apply the clutch.
- Regulated line pressure from the clutch E regulator valve is supplied to the overdrive clutch (E) to apply the clutch.
For hydraulic circuit information, refer to Hydraulic Circuits Hydraulic Circuits.
Electrical Operation
Solenoid operation:
5th Gear Solenoid Operation Chart
CB = Clutch brake
NC = Normally closed
NH = Normally high
NL = Normally low
For solenoid information, refer to Transmission Electronic Control System Transmission Electronic Control System.
6th Gear Torque Converter Clutch (TCC) Applied
Mechanical Operation
Apply components:
- Overdrive clutch (E) applied
- Intermediate clutch (C) applied
Planetary Gearset Operation
Front planetary gearset driving components:
- Ring gear (input shaft)
Front planetary gearset driven components:
- Planetary carrier (does not contribute to power flow)
Front planetary gearset held components:
- Sun gear (splined to pump assembly)
Rear planetary gearset driving components:
- Planetary carrier
Rear planetary gearset driven components:
- Ring gear (output shaft)
Rear planetary gearset held components:
- No. 2 sun gear
6th Gear Torque Converter Clutch (TCC) Applied Clutch Application Chart
- D = Drive Clutch
- H = Hold Clutch
- O/R = Overrunning
For component information, refer to Mechanical Components and Functions Mechanical Components and Functions.
Power Flow
Hydraulic Operation
Line pressure hydraulic circuits:
- The position of the main regulator valve controls line pressure. The position of the main regulator valve is dependent on the pressure applied to it by the LPC solenoid through the VFS5 circuit.
- The main regulator valve varies pressure in the PUMP circuit by controlling hydraulic flow from the SCHG circuit into the pump suction circuit.
- Line pressure is supplied to the:
- manual valve.
- lubrication control valve.
- converter release regulator valve.
- bypass clutch control regulator valve.
- solenoid pressure regulator valve.
- D1 latch and regulator valves.
- In drive, the manual valve directs line pressure to the No. 1 shuttle valve and clutch A, C and E regulator valves.
- The No. 1 shuttle ball directs line pressure to the clutch B regulator valve.
Torque converter circuits:
- When the TCC is applied, the bypass clutch control regulator valve applies pressure to the torque converter through the CAPLY circuit to apply the TCC.
- CAPLY pressure exits the torque converter through the CREL circuit to the converter release regulator valve.
Cooler and lubrication hydraulic circuits:
- The lubrication control valve directs line pressure to the transmission fluid cooler or the thermal bypass valve through the COOLF circuit.
- When the transmission fluid exits the transmission fluid cooler or thermal bypass valve, it provides lubrication to the transmission through the LUBE circuit. For information about transmission lubrication, refer to Mechanical Components and Functions Mechanical Components and Functions.
Solenoid hydraulic circuits:
- The solenoid pressure regulator valve supplies regulated line pressure to the shift, LPC and TCC solenoids through the SREG hydraulic circuit.
- The LPC solenoid applies varying pressure to the main regulator valve through the VFS5 hydraulic circuit. The LPC solenoid regulates line pressure by controlling the position of the main regulator valve.
- The TCC solenoid supplies pressure to the converter release regulator valve and the bypass clutch control regulator valve to move the position of the valves for TCC application.
- SSC supplies pressure to the clutch C regulator valve to position the valve for intermediate clutch (C) application.
- SSD supplies pressure to the solenoid multiplex valve through the VFS4 circuit.
- SSE supplies pressure to the solenoid multiplex valve and the drive enable valve through the SS1 circuit to move the valves.
- The position of the solenoid multiplex valve and the drive enable valve allows pressure from the VFS4 circuit to be directed to the clutch E latch and regulator valves through the CLEC circuit to position the valves for overdrive clutch (E) application.
Clutch hydraulic circuits:
- Regulated line pressure from the clutch C regulator valve is supplied to the intermediate clutch (C) to apply the clutch.
- Regulated line pressure from the clutch E regulator valve is supplied to the overdrive clutch (E) to apply the clutch.
For hydraulic circuit information, refer to Hydraulic Circuits Hydraulic Circuits.
Electrical Operation
Solenoid operation:
6th Gear Torque Converter Clutch (TCC) Applied Solenoid Operation Chart
CB = Clutch brake
NC = Normally closed
NH = Normally high
NL = Normally low
For solenoid information, refer to Transmission Electronic Control System Transmission Electronic Control System.
3rd Gear Fail Safe
Mechanical Operation
Apply components:
- Forward clutch (A) applied
- Direct clutch (B) applied
Planetary Gearset Operation
Front planetary gearset driving components:
- Ring gear (input shaft)
Front planetary gearset driven components:
- Planetary carrier
Front planetary gearset held components:
- Sun gear (splined to pump assembly)
Rear planetary gearset driving components:
- No. 3 sun gear
- No. 2 sun gear
Rear planetary gearset driven components:
- Planetary carrier
- Ring gear (output shaft)
Rear planetary gearset held components:
- None
3rd Gear Fail Safe Clutch Application Chart
- D = Drive Clutch
- O/R = Overrunning
For component information, refer to Mechanical Components and Functions Mechanical Components and Functions.
Power Flow
Hydraulic Operation
Line pressure hydraulic circuits:
- The position of the main regulator valve controls line pressure. The position of the main regulator valve is dependent on the pressure applied to it by the LPC solenoid through the VFS5 circuit.
- The main regulator valve varies pressure in the PUMP circuit by controlling hydraulic flow from the SCHG circuit into the pump suction circuit.
- Line pressure is supplied to the:
- manual valve.
- lubrication control valve.
- converter release regulator valve.
- bypass clutch control regulator valve.
- solenoid pressure regulator valve.
- D1 latch and regulator valves.
- In drive, the manual valve directs line pressure to the No. 1 shuttle valve and clutch A, C and E regulator valves.
- The No. 1 shuttle ball directs line pressure to the clutch B regulator valve.
Torque converter circuits:
- When the TCC is released, the converter release regulator valve applies pressure to the torque converter through the CREL circuit to release the TCC.
- CREL pressure exits the torque converter through the CAPLY circuit to the bypass clutch control regulator valve.
- The bypass clutch control regulator valve directs the pressure from the CAPLY circuit back to the converter release regulator valve through the CAPLY EX circuit.
- The converter release regulator valve directs the pressure from the CAPLY EX circuit to the drain back valve through the DBACK circuit.
Cooler and lubrication hydraulic circuits:
- The lubrication control valve directs line pressure to the transmission fluid cooler or the thermal bypass valve through the COOLF circuit.
- When the transmission fluid exits the transmission fluid cooler or thermal bypass valve, it provides lubrication to the transmission through the LUBE circuit. For information about transmission lubrication, refer to Mechanical Components and Functions Mechanical Components and Functions.
Solenoid hydraulic circuits:
- The solenoid pressure regulator valve supplies line pressure to the shift, LPC and TCC solenoid through the SREG hydraulic circuit.
- The LPC solenoid applies full solenoid output pressure to the main regulator valve through the VFS5 hydraulic circuit. With full solenoid output pressure, the main regulator valve provides maximum line pressure during fail safe.
- SSB supplies maximum solenoid output pressure to the clutch B regulator valve to position the valve for direct clutch (B) application.
Clutch hydraulic circuits:
- Regulated line pressure from the clutch B regulator valve is supplied to the direct clutch (B) to, apply the clutch. Regulated line pressure from the clutch B regulator valve is also supplied to the clutch A latch valve from the clutch B latch valve through the BREV 5F circuit.
- The clutch A latch valve directs the regulated line pressure to the drive enable valve through the BREV5 circuit.
- The drive enable valve directs the BREV5 pressure to the BREVA circuit which supplies the clutch A regulator valve to position the valve to apply the forward clutch (A) with 81% of line pressure.
For hydraulic circuit information, refer to Hydraulic Circuits Hydraulic Circuits.
Electrical Operation
Solenoid operation: In failsafe, voltage is removed from all solenoids and the solenoids default to their normal position. If a solenoid is a normally low (NL) solenoid, the solenoid will not supply pressure to the regulator valve, releasing the clutch that it controls. If a solenoid is a normally high (NH) solenoid, the solenoid will provide high pressure to the regulator valve, applying the clutch that it controls.
3rd Gear Fail Safe Solenoid Operation Chart
CB = Clutch brake
NC = Normally closed
NH = Normally high
NL = Normally low
For solenoid information, refer to Transmission Electronic Control System Transmission Electronic Control System.
