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Home >> Oldsmobile >> 2000 >> Intrigue GL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0530: A/C Refrigerant Pressure 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. Using scan tool, observe A/C refrigerant pressure sensor voltage. If voltage reading is less than 0.1 volt, go to step  5. If voltage reading is not less than 0.1 volt, go to next step.
  3. If voltage reading is greater than 4.8 volts, go to next step. If voltage reading is not greater than 4.6 volts, see DIAGNOSTIC AIDS .
  4. While observing scan tool, disconnect A/C refrigerant pressure sensor connector. If voltage reading is about zero volts, go to step  12. If voltage reading is not as specified, go to step  11.
  5. Disconnect A/C refrigerant pressure sensor connector. Connect a fused jumper wire between A/C refrigerant pressure sensor harness connector 5-volt reference and signal circuit. If voltage reading is about 5 volts, go to step  16. If voltage reading is not as specified, go to next step.
  6. Using a DVOM, check voltage between A/C pressure sensor harness connector 5-volt reference and ground circuits. If voltage reading is about 5 volts, go to step  9. If voltage reading is not as specified, go to next step.
  7. Check for faulty 5-volt reference "B" circuit connection at PCM connector. If faulty connection is found, go to step  17. If connection is okay, go to next step.
  8. Check for open or short in 5-volt reference "B" circuit. If problem is found, go to step  18. If no problem is found, go to step  13.
  9. Check A/C refrigerant signal circuit for faulty connection at PCM. If faulty connection is found, go to step  17. If connection is okay, go to next step.
  10. Check A/C refrigerant pressure signal circuit between A/C refrigerant pressure sensor connector and PCM for open or short to ground. If problem is found, go to step  18. If no problem is found, go to step  20.
  11. Check A/C refrigerant pressure signal circuit between A/C refrigerant pressure sensor connector and PCM for short to voltage. If problem is found, go to step  18. If no problem is found, go to step  20.
  12. Check 5-volt reference circuit for short to voltage. If problem is found, repair as necessary. After repairs, go to step  21. If no problem is found, go to next step.
  13. Check for faulty sensor ground circuit terminal connection at PCM. If faulty connection is found, go to step  17. If connection is okay, go to next step.
  14. Check for faulty sensor ground circuit terminal connection at A/C refrigerant pressure sensor connector. If faulty connection is found, go to step  17. If connection is okay, go to next step.
  15. Check for open or faulty splice in sensor ground circuit. If a problem is found, go to step  18. If no problem is found, go to step  19.
  16. Check for faulty 5-volt reference or A/C refrigerant pressure signal circuit terminal connection at A/C refrigerant pressure sensor. If faulty connection is found, go to next step. If connections are okay, go to step  19.
  17. Replace faulty harness connector terminal. After repairs, go to step  21.
  18. Locate and repair open/short circuit in wiring harness as necessary. After repairs, go to step  21.
  19. Replace A/C refrigerant pressure sensor. After replacing sensor, go to step  21.
  20. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  21. Using scan tool, clear DTCs. Read A/C refrigerant pressure sensor voltage. If voltage reading is 0.1-4.8 volts, go to next step. If voltage reading is not as 0.1-4.8 volts, return to step  2.
  22. Using scan tool, select CAPTURED INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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