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Home >> Infiniti >> 1991 >> Q45 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Engine Sensors & Switches >> Power Steering Oil Pressure Switch

Power Steering Oil Pressure Switch

  1. Switch is attached to power steering high pressure hose. Disconnect switch connector. With engine idling and steering wheel in straight-ahead position, check continuity across switch terminals. Turn steering wheel quickly left or right. Resistance should change from infinite to zero ohm.
  2. Check harness and signal to ECU. With engine idling and steering wheel in straight-ahead position, check voltage between chassis ground and ECU terminal No. 40. Voltage should be zero. Turn steering wheel quickly left or right. Voltage should change from zero to battery voltage.
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