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Home >> Oldsmobile >> 1998 >> Regency >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0530 - A/C Refrigerant Pressure Sensor Circuit >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. After performing OBD system check, go to next step.
  2. Using scan tool, read A/C refrigerant pressure sensor voltage. If voltage is less than 0.1 volt, go to step 5). If voltage is not less than 0.1 volt, go to next step.
  3. If voltage is greater than 4.8 volts, go to next step. If voltage is not greater than 4.8 volts, go to DIAGNOSTIC AIDS.
  4. While observing scan tool, disconnect A/C refrigerant pressure sensor connector. If voltage is about zero volts, go to step 12). If voltage 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 is about 5 volts, go to step 16). If voltage 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 is about 5 volts, go to step 9). If voltage is not as specified, go to next step.
  7. Check for faulty 5-volt reference circuit connection at PCM. If faulty connection is found, go to step 17). If connection is okay, go to next step.
  8. Check for open or a faulty splice in 5-volt reference 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. Repair as necessary. After repairs, go to step 18). 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 is 0.1-4.8 volts, repair is complete. If voltage is not as specified, return to step 2).
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