Hydraulic Circuits
Line Pressure Hydraulic Circuits
| Item | Description |
|---|---|
| 1 | Mechanical pump |
| 2 | Pump output |
| 3 | Main regulator valve |
| 4 | Pump output decreased |
| 5 | LPC solenoid |
| 6 | LPC pressure |
| 7 | Isolator valve |
| 8 | Anti-backflow valve |
| 9 | Transmission fluid auxiliary pump (model dependent) |
| 10 | Line pressure |
The PCM or TCM controls line pressure with the LPC solenoid. Varying pressure from the LPC solenoid effects shift feel while allowing sufficient pressure for clutch application.
When the engine is running, the pump supplies pressure to the main regulator valve through the pump output circuit. Pressure from the LPC solenoid through the LPC pressure circuit controls the position of the main regulator valve.
The main regulator valve varies pressure in the pump output circuit.
If equipped, the transmission fluid auxiliary pump, an electronic pump is turned on before an engine stop event to maintain line pressure, allowing the transmission to stay engaged during the stop event. This allows quick response on the engine restart because the transmission is already in gear.