Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Line Pressure Control
When torque signal equivalent to engine driving force is sent from ECM to TCM, TCM controls the line pressure solenoid. By using the line pressure solenoid pressure as the signal pressure, controls the primary regulator valve and adjusts the pressure of ATF discharged from oil pump to the optimum level depending on the driving condition.
Maximum value of the calculated four values of required line pressure is set as the line pressure.
| No. | Control details |
|---|---|
| 1. Required line pressure for lubrication | The line pressure is calculated based on the input torque and gear range. |
| 2. Required line pressure for shift clutch | The line pressure is calculated based on the input torque, front vehicle speed signal, rear vehicle speed signal and gear range. |
| 3. Required line pressure for multi-plate clutch controlled by AWD | The line pressure required for the multi-plate clutch (LSD) is calculated. |
| 4. Required line pressure for lock-up clutch | The line pressure required for the lock-up clutch is calculated. |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.