Genuine Acura Integra Power Steering Pressure Switch

Acura Integra Power Steering Pressure Switch Parts Questions & Experts Answers

• Switch Assembly, Power Steering Pressure
  56490-P2A-003
  Q: What is the function and testing procedure of the power steering pressure (PSP) switch on Acura Integra?

  A: The power steering pressure (PSP) switch, found on US models, is a normally closed switch located in the pressure line near the steering gear. It sends a signal to the PCM when the steering system pressure reaches a high-pressure setpoint, helping to maintain engine idle speed during parking maneuvers. The OBD system can detect issues with the switch and set trouble codes for specific faults. To check the operation of the PSP switch, disconnect its electrical connector and connect an ohmmeter to the terminals. Start the engine and let it idle, ensuring the front wheels are straight; the ohmmeter should show close to zero ohms. As the steering wheel is turned towards the stops, the PSP should open, indicating an open circuit. If the switch fails either test, it should be replaced. To replace the switch, disconnect the cable from the negative battery terminal, ensuring to have the radio's anti-theft code if applicable. If needed, raise the vehicle securely on jackstands, disconnect the electrical connector from the switch, and unscrew it from its fitting. Install and connect the new switch, lower the vehicle if it was raised, and bleed air from the power steering system, adding fluid as necessary.