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Home >> Oldsmobile >> 2000 >> Intrigue GL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0550: Power Steering Pressure (PSP) Sensor Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Start engine. Using scan tool, monitor PSP switch parameter. Start engine. Turn steering wheel from straight-ahead to full left lock position and back to straight-ahead position. If scan tool display changes from NORMAL to HI PRESS and back to NORMAL, see DIAGNOSTIC AIDS . If scan tool display does not change, go to next step.
  3. Turn engine off. Turn ignition on, with engine off. Observe scan tool display. If scan tool display remains at HI PRESS, go to next step. If scan tool display does not remain at HI PRESS, diagnose power steering system.
  4. Disconnect PSP switch harness connector. Using a DVOM, check voltage between ground and PSP signal circuit at harness connector. If voltage reading is 10 volts or greater, go to next step. If voltage reading is not 10 volts or greater, go to step  6.
  5. Using a jumper wire, jumper PSP switch connector terminals "A" and "B". Observe scan tool display. If scan tool reads NORMAL, go to step  9. If scan tool does not read NORMAL, go to step  8.
  6. Turn ignition off. Disconnect PCM harness connector. Check continuity of PSP signal circuit from PCM to PSP switch harness connector. If continuity exists, go to step  10. If continuity does not exist, go to next step.
  7. Repair open or high resistance in signal circuit. After repairs, go to step  13.
  8. Repair open or high resistance in ground circuit. After repairs, go to step  13.
  9. Check for poor connection or terminal tension at PSP switch. Repair as necessary. After repairs, go to step  13. If connection or terminal tension is okay, go to step  11.
  10. Check for poor connection or terminal tension at PCM. Repair as necessary. After repairs, go to step  13. If connection or terminal tension is okay, go to step  12.
  11. Replace PSP switch. After replacing switch, go to step  13.
  12. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  13. Using scan tool, clear DTCs. Turn ignition off for about 15 seconds. Operate vehicle within conditions required for this DTC to run. If scan tool indicate that his test ran and passed, go to next step. If scan tool indicates that this test ran and passed, go to next step.
  14. Using scan tool, select CAPTURED INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. If no DTCs are displayed, system is okay.
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