Power Steering Oil Pressure Switch

Switch is attached to power steering high pressure hose. Signal is used by ECU to help control idle speed. Check voltage at appropriate ECU terminal with engine idling and steering wheel in straight ahead position. See appropriate PIN VOLTAGE CHART S and WIRING DIAGRAMS articles to identify proper ECU terminal for testing. Voltage should be 7-9 volts. Turn steering wheel from side to side. With steering wheel being turned, voltage should be .1-.3 volt. See appropriate POWER STEERING OIL PRESSURE SWITCH diagnostic chart.