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Home >> Acura >> 1991 >> Integra LS, 2D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Power Steering (P/S) Oil Pressure Signal
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Power Steering (P/S) Oil Pressure Signal

  1. Connect PGM-FI test harness between ECU and ECU connectors. Start engine. Measure voltage between ECU terminals B19 (positive) and A18 (negative). If voltage is less than one volt, go to step 3).
  2. If voltage is more than one volt, disconnect 2-wire connector on P/S oil pressure switch located on power steering pump. Jump Red and Black wire terminals. If less than one volt is present, replace P/S pressure switch. If more than one volt is present, repair open in Red wire (between ECU terminal B19 and P/S oil pressure switch) or Black wire and ground connection.
  3. Start engine, and turn steering wheel slowly. Measure voltage between ECU terminals B19 (positive) and A18 (negative) while wheel is being turned. If battery voltage exists, P/S oil pressure signal is okay.
  4. If battery voltage is not present, turn ignition off. Disconnect PGM-FI test harness connector "B" from main wire harness only; DO NOT  disconnect from ECU. Turn ignition on. If battery voltage is still not present, try a known good ECU. If problem goes away, replace ECU.
  5. If battery voltage exists, reconnect connector "B" to main wiring harness. Disconnect P/S oil pressure switch 2-wire connector, and check Red wire for battery voltage. If voltage is present, replace P/S oil pressure switch. If voltage is not present, repair short in Red wire between ECU terminal B19 and P/S oil pressure switch.
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