Park - Engine Running through Drive Range - Fourth Gear
Transmission General InformationPark - Engine Running
Distribution of Hydraulic Pressure
As the engine turns, the automatic transmission fluid ([1][2]ATF) pump starts to operate. ATF is drawn through the ATF filter and discharged into the hydraulic circuit. ATF flowing from the ATF pump becomes line pressure that is regulated by the regulator valve. Torque converter pressure, from the regulator valve, enters the torque converter through the lock-up shift valve and is discharged from the torque converter. The torque converter check valve prevents torque converter pressure from rising.
The powertrain control module (PCM) controls the shift solenoid valves ON and OFF. The shift solenoid valves control shift solenoid pressure to the shift valves. Applying shift solenoid pressure to the shift valves moves the position of the shift valve, and switches the port of hydraulic pressure. The PCM also controls the automatic transmission clutch pressure control (AT CPC) solenoid valves A and B.
The AT CPC solenoid valves A and B regulate the AT CPC solenoid pressure and apply the AT CPC solenoid pressure to CPC valves A and B. When shifting between upper gear and lower gear, the clutch is engaged by pressure from the CPC pressure mode.
The PCM controls one of the shift solenoid (SS) valves to move the position of the shift valve. This movement switches the port of the CPC and line pressure. Line pressure is then applied to the clutch, and the CPC pressure is intercepted.
When shifting is completed, the clutch is engaged with line pressure.
Hydraulic Pressure at the Ports
P Position
Shift solenoid (SS) valve C is turned OFF by the PCM, and SH C pressure (SC) is applied to the right side of the reverse CPC valve. Then the reverse CPC valve is moved to the left side to uncover the port leading line pressure (3) to the servo valve. Line pressure (3') passes through the servo valve and flows to the manual valve. Line pressure (3") is intercepted at the manual valve, and is not applied to the clutches.
When used, "left" or "right" indicates direction on the hydraulic circuit.
Park - Engine Running (possible Fluid Leak Points)
Reverse
Distribution of Hydraulic Pressure
As the engine turns, the automatic transmission fluid ([1][2]ATF) pump starts to operate. ATF is drawn through the ATF filter and discharged into the hydraulic circuit. ATF flowing from the ATF pump becomes line pressure that is regulated by the regulator valve. Torque converter pressure, from the regulator valve, enters the torque converter through the lock-up shift valve and is discharged from the torque converter. The torque converter check valve prevents torque converter pressure from rising.
The powertrain control module (PCM) controls the shift solenoid valves ON and OFF. The shift solenoid valves control shift solenoid pressure to the shift valves. Applying shift solenoid pressure to the shift valves moves the position of the shift valve, and switches the port of hydraulic pressure. The PCM also controls the automatic transmission clutch pressure control (AT CPC) solenoid valves A and B.
The AT CPC solenoid valves A and B regulate the AT CPC solenoid pressure and apply the AT CPC solenoid pressure to CPC valves A and B. When shifting between upper gear and lower gear, the clutch is engaged by pressure from the CPC pressure mode.
The PCM controls one of the shift solenoid (SS) valves to move the position of the shift valve. This movement switches the port of the CPC and line pressure. Line pressure is then applied to the clutch, and the CPC pressure is intercepted.
When shifting is completed, the clutch is engaged with line pressure.
Hydraulic Pressure at the Ports
R Position: Driving in Reverse Gear
The PCM turns shift solenoid (SS) valve C OFF. SS valve A stays OFF and SS valve B stays ON. SS valve C is turned OFF, and SH C pressure (SC) is applied to the right side of the reverse CPC valve. Then the reverse CPC valve moves to the left side, creating full line pressure. Line pressure to the 5th clutch is the same as when shifting to the R position, and 5th clutch pressure increases. The 5th clutch is engaged with line pressure.
Reverse Inhibitor Control
When R position is selected, while the vehicle is moving forward at speeds over 6 mph (10 km/h), the PCM outputs to turn the SS valves A and C ON, and SS valve B stays ON. The reverse CPC valve is moved to the right side and covers the port to stop the line pressure (3) to the servo valve. Line pressure (T) is not applied to the servo valve, and the 5th clutch pressure (50) is not applied to the 5th clutch, as a result, power is not transmitted to the reverse direction.
When used, "left" or "right" indicates direction on the hydraulic circuit.
Reverse (Possible Fluid Leak Points)
Neutral - Engine Running
Distribution of Hydraulic Pressure
As the engine turns, the automatic transmission fluid ([1][2]ATF) pump starts to operate. ATF is drawn through the ATF filter and discharged into the hydraulic circuit. ATF flowing from the ATF pump becomes line pressure that is regulated by the regulator valve. Torque converter pressure, from the regulator valve, enters the torque converter through the lock-up shift valve and is discharged from the torque converter. The torque converter check valve prevents torque converter pressure from rising.
The powertrain control module (PCM) controls the shift solenoid valves ON and OFF. The shift solenoid valves control shift solenoid pressure to the shift valves. Applying shift solenoid pressure to the shift valves moves the position of the shift valve, and switches the port of hydraulic pressure. The PCM also controls the automatic transmission clutch pressure control (AT CPC) solenoid valves A and B.
The AT CPC solenoid valves A and B regulate the AT CPC solenoid pressure and apply the AT CPC solenoid pressure to CPC valves A and B.. When shifting between upper gear and lower gear, the clutch is engaged by pressure from the CPC pressure mode.
The PCM controls one of the shift solenoid (SS) valves to move the position of the shift valve. This movement switches the port of the CPC and line pressure. Line pressure is then applied to the clutch, and the CPC pressure is intercepted.
When shifting is completed, the clutch is engaged with line pressure.
Hydraulic Pressure at the Ports
N Position
The PCM controls the shift solenoid valves. The condition of the shift solenoid valves and position of the shift valves is as follows:
- Shift solenoid valve A is turned OFF, and shift valve A is moved to the left side.
- Shift solenoid valve B is turned ON, and shift valve B remains in the right side.
- Shift solenoid valve C is turned OFF, and shift valve C remains in the left side.
Line pressure (1) passes through the manual valve and becomes line pressure (25). Line pressure (25) stops at shift valve D. Line pressure (1) also flows to the modulator valve and becomes modulator pressure (6). Modulator pressure (6) flows to the SS valves, the AT CPC solenoid valves A and B, and the AT CPC solenoid valve C. Under this condition, hydraulic pressure is not applied to the clutches.
When used, "left" or "right" indicates direction on the hydraulic circuit.
Neutral - Engine Running (Possible Fluid Leak Points)
Drive or Intermediate - First Gear
Distribution of Hydraulic Pressure
As the engine turns, the automatic transmission fluid ([1][2]ATF) pump starts to operate. ATF is drawn through the ATF filter and discharged into the hydraulic circuit. ATF flowing from the ATF pump becomes line pressure that is regulated by the regulator valve. Torque converter pressure, from the regulator valve, enters the torque converter through the lock-up shift valve and is discharged from the torque converter. The torque converter check valve prevents torque converter pressure from rising.
The powertrain control module (PCM) controls the shift solenoid valves ON and OFF. The shift solenoid valves control shift solenoid pressure to the shift valves. Applying shift solenoid pressure to the shift valves moves the position of the shift valve, and switches the port of hydraulic pressure. The PCM also controls the automatic transmission clutch pressure control (AT CPC) solenoid valves A and B.
The AT CPC solenoid valves A and B regulate the AT CPC solenoid pressure and apply the AT CPC solenoid pressure to CPC valves A and B. When shifting between upper gear and lower gear, the clutch is engaged by pressure from the CPC pressure mode.
The PCM controls one of the shift solenoid (SS) valves to move the position of the shift valve. This movement switches the port of the CPC and line pressure. Line pressure is then applied to the clutch, and the CPC pressure is intercepted.
When shifting is completed, the clutch is engaged with line pressure.
Hydraulic Pressure at the Ports
D or I Position: Driving in 1st gear
The PCM turns SS valve A and C ON, and SS valve B stays ON. SH A pressure (SA) in the right side of shift valve A and E is released, and shift valve A and E are moved to the right side. SH C pressure (SC) in the right side of shift valve C is released, and modulator pressure (6) is applied to the left side of shift valve C. Shift valve C is moved to the right side.
These valve movements release CPC C pressure (4C) from the back of the 1st accumulator and the 3rd clutch, and the 1st clutch is engaged securely.
When used, "left" or "right" indicates direction on the hydraulic circuit.
Drive or Intermediate - First Gear (Possible Fluid Leak Points)
Drive or Intermediate - Second Gear
Distribution of Hydraulic Pressure
As the engine turns, the automatic transmission fluid ([1][2]ATF) pump starts to operate. ATF is drawn through the ATF filter and discharged into the hydraulic circuit. ATF flowing from the ATF pump becomes line pressure that is regulated by the regulator valve. Torque converter pressure, from the regulator valve, enters the torque converter through the lock-up shift valve and is discharged from the torque converter. The torque converter check valve prevents torque converter pressure from rising.
The powertrain control module (PCM) controls the shift solenoid valves ON and OFF. The shift solenoid valves control shift solenoid pressure to the shift valves. Applying shift solenoid pressure to the shift valves moves the position of the shift valve, and switches the port of hydraulic pressure. The PCM also controls the automatic transmission clutch pressure control (AT CPC) solenoid valves A and B.
The AT CPC solenoid valves A and B regulate the AT CPC solenoid pressure and apply the AT CPC solenoid pressure to CPC valves A and B. When shifting between upper gear and lower gear, the clutch is engaged by pressure from the CPC pressure mode.
The PCM controls one of the shift solenoid (SS) valves to move the position of the shift valve. This movement switches the port of the CPC and line pressure. Line pressure is then applied to the clutch, and the CPC pressure is intercepted.
When shifting is completed, the clutch is engaged with line pressure.
Hydraulic Pressure at the Ports
D or I Position: Driving in 2nd gear
The PCM turns shift solenoid (SS) valve C OFF, and SS valve A and B stays ON. SS valve C is turned OFF, and SH C pressure (SC) is applied to the right side of shift valve C. Then shift valve C is moved to the left side to switch the port of line pressure and CPC pressure. 2nd clutch pressure is changed to line pressure mode, and the 2nd clutch is engaged securely. The 1st clutch is also engaged. No power is transmitted because of the one-way clutch.
When used, "left" or "right" indicates direction on the hydraulic circuit.
Drive or Intermediate - Second Gear (Possible Fluid Leak Points)
Drive or Intermediate - Third Gear
Distribution of Hydraulic Pressure
As the engine turns, the automatic transmission fluid ([1][2]ATF) pump starts to operate. ATF is drawn through the ATF filter and discharged into the hydraulic circuit. ATF flowing from the ATF pump becomes line pressure that is regulated by the regulator valve. Torque converter pressure, from the regulator valve, enters the torque converter through the lock-up shift valve and is discharged from the torque converter. The torque converter check valve prevents torque converter pressure from rising.
The powertrain control module (PCM) controls the shift solenoid valves ON and OFF. The shift solenoid valves control shift solenoid pressure to the shift valves. Applying shift solenoid pressure to the shift valves moves the position the shift valve, and switches the port of hydraulic pressure. The PCM also controls the automatic transmission clutch pressure control (AT CPC) solenoid valves A and B.
The AT CPC solenoid valves A and B regulate the AT CPC solenoid pressure and apply the AT CPC solenoid pressure to CPC valves A and B. When shifting between upper gear and lower gear, the clutch is engaged by pressure from the CPC pressure mode.
The PCM controls one of the shift solenoid (SS) valves to move the position of the shift valve. This movement switches the port of the CPC and line pressure. Line pressure is then applied to the clutch, and the CPC pressure is intercepted.
When shifting is completed, the clutch is engaged with line pressure.
Hydraulic Pressure at the Ports
D or I Position: Driving in 3rd gear
The PCM turns shift solenoid (SS) valve C ON, and controls AT CPC solenoid valve A to release LS A pressure (56) in CPC valve A. SS valve A keeps OFF, and B stays ON. The release of LS A pressure (56) in CPC valve A releases CPC A pressure in the 2nd clutch pressure circuit. SS valve C is turned ON, and SH C pressure (SC) in the right side of shift valve C is released. SS valve C is then moved to the right side to switch the port of line pressure and CPC pressure. The 3rd clutch pressure is changed to line pressure mode, and the 3rd clutch is engaged securely. The 1st clutch is also engaged. No power is transmitted because of the one-way clutch.
When used, "left" or "right" indicates direction on the hydraulic circuit.
Drive or Intermediate - Third Gear (Possible Fluid Leak Points)
Drive Range - Fourth Gear
Distribution of Hydraulic Pressure
As the engine turns, the automatic transmission fluid ([1][2]ATF) pump starts to operate. ATF is drawn through the ATF filter and discharged into the hydraulic circuit. ATF flowing from the ATF pump becomes line pressure that is regulated by the regulator valve. Torque converter pressure, from the regulator valve, enters the torque converter through the lock-up shift valve and is discharged from the torque converter. The torque converter check valve prevents torque converter pressure from rising.
The powertrain control module (PCM) controls the shift solenoid valves ON and OFF. The shift solenoid valves control shift solenoid pressure to the shift valves. Applying shift solenoid pressure to the shift valves moves the position of the shift valve, and switches the port of hydraulic pressure. The PCM also controls the automatic transmission clutch pressure control (AT CPC) solenoid valves A and B.
The AT CPC solenoid valves A and B regulate the AT CPC solenoid pressure and apply the AT CPC solenoid pressure to CPC valves A and B. When shifting between upper gear and lower gear, the clutch is engaged by pressure from the CPC pressure mode.
The PCM controls one of the shift solenoid (SS) valves to move the position of the shift valve. This movement switches the port of the CPC and line pressure. Line pressure is then applied to the clutch, and the CPC pressure is intercepted.
When shifting is completed, the clutch is engaged with line pressure.
Hydraulic Pressure at the Ports
D Position: Driving in 4th gear
The PCM turns shift solenoid (SS) valve C OFF, and controls AT CPC solenoid valve B to release LS B pressure (57) in CPC valve B. SS valve A and B stay OFF. The release of LS B pressure (57) in CPC valve B releases CPC B pressure in the 3rd clutch pressure circuit. SS valve C is turned OFF, and SH C pressure (SC) is applied to the right side of shift valve C. Shift valve C is then moved to the left side to switch the port of line pressure and CPC pressure. Line pressure (4), from the manual valve, becomes 4th clutch pressure (40) at shift valve D, via shift valve C, A, and B, and flows to the 4th clutch. The 4th clutch pressure is changed to line pressure mode by switching the position of shift valve C, and the 4th clutch is engaged securely. The 1st clutch is also engaged. No power is transmitted because of the one-way clutch.
When used, "left" or "right" indicates direction on the hydraulic circuit.
Drive Range - Fourth Gear (Possible Fluid Leak Points)