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Power Steering (P/S) Oil Pressure Signal

WARNING: This page is about a different car, the 1992 Acura Legend. However, it is still accessible from the selected car via links, so may be relevant.
  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 one volt, go to step 3). If battery voltage exists, disconnect 2-wire connector on P/S oil pressure switch located on power steering pump. Connect jumper between 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 in Green/White wire leading to 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 are not present, try a known good ECU. If problem goes away, replace ECU.
  5. If battery voltage exists, reconnect connector "B" to main harness. Unplug 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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