Part 2
Transmission Operation
1st Gear
Mechanical Operation
Apply components:
- Low/reverse clutch (D) applied Below 5 kph (3 mph) only
- Low/One-Way Clutch (OWC)
- Forward clutch (A) 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
Rear planetary gearset driven components:
- Ring gear (output shaft)
Rear planetary gearset held components:
- Planetary carrier
1st Gear Clutch Application Chart
- D = Drive Clutch
- H = Hold Clutch
- O/R = Overrunning
a Clutch released when vehicle speed is above 3 mph.
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 (Line Pressure Control) 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 (Torque Converter Clutch) is released, the converter release regulator valve applies pressure to the torque converter through the CREL circuit to release the TCC (Torque Converter Clutch).
- 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 (Line Pressure Control) and TCC (Torque Converter Clutch) solenoid through the SREG hydraulic circuit.
- The LPC (Line Pressure Control) solenoid applies varying pressure to the main regulator valve through the VFS5 hydraulic circuit. The LPC (Line Pressure Control) solenoid regulates line pressure by controlling the position of the main regulator valve.
- Below 5 kph (3 mph), SSD (Shift Solenoid D) supplies pressure to the solenoid multiplex valve through the VFS4 circuit. Above 5 kph (3 mph), amperage to SSD (Shift Solenoid D) is increased to decrease pressure to the solenoid multiplex valve and clutch D1 regulator valve to release the low/reverse clutch (D).
- The position of the solenoid multiplex valve allows pressure from the VFS4 circuit to be directed to the D1 latch and regulator valves through the CLDC circuit to position the valves for low/reverse clutch (D) application.
- SSA (Shift Solenoid A) supplies pressure to the clutch A regulator and latch valves to position the valves for forward clutch (A) application.
Clutch hydraulic circuits:
- Line pressure is supplied by the pump to the D1 latch and regulator valves.
- Below 5 kph (3 mph), regulated line pressure from the D1 regulator valve is supplied to the low/reverse clutch (D) to apply the clutch. Above 5 kph (3 mph) the D1 regulator valve exhausts to release the low/reverse clutch and the Low/OWC (One-Way Clutch) continues to hold the rear planetary carrier with no engine braking.
- Regulated line pressure from the clutch A regulator valve is supplied to the forward clutch (A) to apply the clutch.
For hydraulic circuit information, refer to Hydraulic Circuits Hydraulic Circuits.
Electrical Operation
Solenoid operation:
1st Gear Solenoid Operation Chart
CB = Clutch brake
NC = Normally closed
NH = Normally high
NL = Normally low
b Solenoid is On when vehicle is above 3 mph.
For solenoid information, refer to Transmission Electronic Control System Transmission Electronic Control System.
2nd Gear
Mechanical Operation
Apply components:
- Forward clutch (A) applied
- Intermediate clutch (C) 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
Rear planetary gearset driven components:
- Planetary carrier
- Ring gear (output shaft)
Rear planetary gearset held components:
- No. 2 sun gear
2nd Gear 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 (Line Pressure Control) 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 (Torque Converter Clutch) is released, the converter release regulator valve applies pressure to the torque converter through the CREL circuit to release the TCC (Torque Converter Clutch).
- 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 (Line Pressure Control) and TCC (Torque Converter Clutch) solenoid through the SREG hydraulic circuit.
- The LPC (Line Pressure Control) solenoid applies varying pressure to the main regulator valve through the VFS5 hydraulic circuit. The LPC (Line Pressure Control) solenoid regulates line pressure by controlling the position of the main regulator valve.
- SSA (Shift Solenoid A) supplies pressure to the clutch A regulator and latch valves to position the valves for forward clutch (A) application.
- SSC (Shift Solenoid C) supplies pressure to the clutch C regulator valve to position the valve for intermediate clutch (C) application.
Clutch hydraulic circuits:
- Regulated line pressure from the clutch A regulator valve is supplied to the forward clutch (A) to apply the clutch.
- Regulated line pressure from the clutch C regulator valve is supplied to the intermediate clutch (C) to apply the clutch.
For hydraulic circuit information, refer to Hydraulic Circuits Hydraulic Circuits.
Electrical Operation
Solenoid operation:
2nd 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.
3rd Gear
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 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 (Line Pressure Control) 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 (Torque Converter Clutch) is released, the converter release regulator valve applies pressure to the torque converter through the CREL circuit to release the TCC (Torque Converter Clutch).
- 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 (Line Pressure Control) and TCC (Torque Converter Clutch) solenoid through the SREG hydraulic circuit.
- The LPC (Line Pressure Control) solenoid applies varying pressure to the main regulator valve through the VFS5 hydraulic circuit. The LPC (Line Pressure Control) solenoid regulates line pressure by controlling the position of the main regulator valve.
- SSA (Shift Solenoid A) supplies pressure to the clutch A regulator and latch valves to position the valves for forward clutch (A) application.
- SSB (Shift Solenoid B) supplies 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 A regulator valve is supplied to the forward clutch (A) to apply the clutch.
- Regulated line pressure from the clutch B regulator valve is supplied to the direct clutch (B) to apply the clutch.
For hydraulic circuit information, refer to Hydraulic Circuits Hydraulic Circuits.
Electrical Operation
Solenoid operation:
3rd 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.
4th Gear
Mechanical Operation
Apply components:
- Forward clutch (A) applied
- Overdrive clutch (E) 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
- Planetary carrier
Rear planetary gearset driven components:
- Ring gear (output shaft)
Rear planetary gearset held components:
- None
4th 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 (Line Pressure Control) 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 (Torque Converter Clutch) is released, the converter release regulator valve applies pressure to the torque converter through the CREL circuit to release the TCC (Torque Converter Clutch).
- 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 (Line Pressure Control) and TCC (Torque Converter Clutch) solenoid through the SREG hydraulic circuit.
- The LPC (Line Pressure Control) applies varying pressure to the main regulator valve through the VFS5 hydraulic circuit. The LPC (Line Pressure Control) solenoid regulates line pressure by controlling the position of the main regulator valve.
- SSA (Shift Solenoid A) supplies pressure to the clutch A regulator and latch valves to position the valves for forward clutch (A) application.
- SSD (Shift Solenoid D) supplies pressure to the solenoid multiplex valve through the VFS4 circuit.
- SSE (Shift Solenoid E) 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 A regulator valve is supplied to the forward clutch (A) 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:
4th 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.
