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Home >> Acura >> 1995 >> Legend GS, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - System/Component Tests >> Idle Control System >> Engine Controls - System/Component Tests >> Power Steering Pressure (PSP) Switch Signal
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Power Steering Pressure (PSP) Switch Signal

  1. Connect ECM test harness between ECM and ECM connectors. Measure voltage between terminals B5 (positive) and D22 (negative). If voltage is less than one volt, go to step 3). If battery voltage exists, disconnect 2-wire connector on PSP switch located on power steering pump. Connect jumper between Green and Green/White wire terminals.
  2. If battery voltage exists, replace PSP switch. If less than one volt exists, repair open in Green wire (between ECM terminal B5 and PSP switch) or Green/White wire leading to ECM terminal D22.
  3. Start engine. Turn steering wheel slowly. Measure voltage between ECM test harness terminals B5 (positive) and D22 (negative) while wheel is being turned. If battery voltage exists, PSP signal is okay.
  4. If battery voltage does not exist, disconnect ECM test harness connector "B" to main wire harness only. DO NOT  disconnect from ECM. Turn ignition on. If 12 volts dose not exist, try a known-good ECM. If problem goes away, replace ECM.
  5. If battery voltage exists, reconnect connector "B" to main harness. Unplug connector from PSP switch. Check Green wire for battery voltage. If battery voltage exists, replace P/S oil pressure switch. If battery voltage does not exist, repair short in Green wire between ECM terminal B5 and PSP switch.
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