1. Detects Steering System Pressure: The pressure switch monitors the hydraulic pressure within the power steering system. It senses when the pressure reaches a predetermined level, indicating that the system is operating within its normal range.
2. Activates Power Steering Pump: When the pressure drops below the specified level, the pressure switch triggers the power steering pump to engage. This ensures that the pump provides sufficient pressure to assist in steering the vehicle.
3. Protects Against Over-Pressurization: In case the power steering system experiences excessive pressure, the pressure switch acts as a safety mechanism. It sends a signal to the power steering control module or the engine control unit (ECU) to reduce the pump's output or shut it off completely to prevent damage to the system.
As for the 2005 Toyota Tacoma specifically, the computer (engine control unit or power steering control module) uses the information provided by the pressure switch to monitor and regulate the power steering system's operation. Here are a few key functions:
1. Pump Control: The computer uses the pressure switch input to determine when the power steering pump should be activated or deactivated. It ensures that the pump operates only when necessary, saving energy and reducing wear and tear.
2. Steering Feel Adjustment: The computer may use the pressure switch input to adjust the steering feel of the Tacoma. By altering the pump pressure, the computer can adjust the level of assistance provided by the power steering system.
3. Fault Detection: If the computer detects abnormal pressure readings from the pressure switch, it can trigger a diagnostic trouble code (DTC) and illuminate the check engine light. This helps identify potential issues within the power steering system.
4. Integration with Other Systems: In some cases, the computer may use the pressure switch input to integrate the power steering system with other vehicle systems, such as the stability control or traction control systems. By adjusting the steering feel and stability, the computer can optimize overall vehicle handling and safety.
