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Home >> Buick >> 1996 >> Roadmaster Base >> 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. After performing OBD system check, go to next step.
  2. Turn ignition on, with engine on. Using scan tool, monitor A/C high side. A/C high voltage reading should be 0.1-1.8 volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step 4).
  3. Turn ignition on, with engine off. Review FREEZE FRAME data and note parameters. Operate vehicle within FREEZE FRAME parameters. If test indicates that this test failed this ignition cycle while operating vehicle, go to next step. If test did not indicate that this test failed this ignition cycle, see DIAGNOSTIC AIDS.
  4. Disconnect A/C refrigerant pressure sensor harness connector. If A/C high side voltage is less than one volt, go to next step. If voltage is greater than one volt, go to step 9).
  5. Using DVOM, check voltage between A/C refrigerant pressure sensor 5-volt reference circuit and battery ground. If voltage is about 5 volts, go to next step. If voltage is not as specified, go to step 10).
  6. Using DVOM, check voltage between A/C refrigerant pressure sensor 5-volt reference circuit and sensor ground. If voltage is about 5 volts, go to next step. If voltage is not as specified, go to step 11).
  7. Using jumper wire, jumper the 5-volt reference circuit to sensor signal ground. DVOM should read about 5 volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step 12).
  8. Repair faulty A/C refrigerant pressure sensor connection or replace faulty sensor. After repairs, go to step 13).
  9. Repair A/C refrigerant pressure sensor signal circuit shorted to voltage. After repairs, go to step 13).
  10. Repair 5-volt reference circuit to pressure sensor. After repairs, go to step 13).
  11. Repair ground circuit to pressure sensor. After repairs, go to step 13).
  12. Repair signal circuit to pressure sensor. After repairs, go to next step.
  13. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0530. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool did not indicate that this test ran and passed, repeat step 2).
  14. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTC(s) are displayed, go to applicable DTC test.
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