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Home >> Acura >> 1991 >> Legend Base, 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. Measure voltage between terminals B5 (positive) and D22 (negative). If voltage is less than 1 volt, go to step 3). If battery voltage exists, disconnect 2-wire connector on P/S oil pressure switch located on power steering pump. Jump Green and Green/White wire terminals.
  2. If battery voltage is present, replace P/S oil pressure switch. If less than one volt is present, repair open in Green wire (between ECU terminal B5 and P/S pressure switch) or Green/White wire and ECU terminal D22.
  3. Start engine, and turn steering wheel slowly. Measure voltage between PGM-FI test harness terminals B5 (positive) and D22 (negative) while wheel is being turned. If battery voltage exists, P/S oil pressure signal is okay.
  4. If battery voltage is not present, disconnect PGM-FI test harness connector "B" to main wire harness only; DO NOT  disconnect from ECU. Turn ignition on. If 12 volts is not present, try a known good ECU. If problem goes away, replace ECU.
  5. If battery voltage exists, reconnect connector "B" to main harness. Disconnect 2-wire connector from P/S oil pressure switch. Check Green wire for battery voltage. If battery voltage is present, replace P/S oil pressure switch. If battery voltage is not present, repair short in Green wire between ECU terminal B5 and P/S oil pressure switch.
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