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Home >> Chevrolet >> 2000 >> Impala LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 3.8L >> 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. Turn ignition on. Using scan tool, observe A/C refrigerant pressure sensor voltage parameter. If voltage reading is within 0.1-4.9 volts, see DIAGNOSTIC AIDS . If voltage reading is not within 0.1-4.9 volts, go to next step.
  3. Turn ignition off. Disconnect A/C refrigerant pressure sensor connector. Turn ignition on. Using scan tool, observe A/C pressure sensor parameter. If voltage reading is less than 0.1 volt, go to next step. If voltage reading is not less than 0.1 volt, go to step  10.
  4. Turn ignition off. Connect a fused jumper wire between A/C refrigerant pressure sensor 5-volt reference and signal circuit. Turn ignition on. Using scan tool, observe A/C pressure sensor parameter. If voltage reading is greater than 4.9 volts, go to next step. If voltage reading is not greater than 4.9 volts, go to step  8.
  5. Disconnect jumper wire. Check voltage between 5-volt reference and ground circuit. If voltage reading is less than 5.1 volts, go to next step. If voltage reading is not less than 5.1 volts, go to step  7.
  6. Disconnect negative battery cable. Using a DVOM, check resistance between a known-good ground and A/C pressure sensor ground circuit. If resistance is less than 5 ohms, go to step  12. If resistance is not less than 5 ohms, go to step  13.
  7. Check 5-volt reference circuit for short to voltage. Repair as necessary. After repairs, go to step  16. If circuit is okay, go to step  13.
  8. Check 5-volt reference circuit for high resistance or open circuit. Repair as necessary. After repairs, go to step  16. If circuit is okay, go to next step.
  9. Check signal circuit for short to ground, high resistance or open circuit. Repair as necessary. After repairs, go to step  16. If circuit is okay, go to step  13.
  10. Check signal circuit for short to voltage. Repair as necessary. After repairs, go to step  16. If circuit is okay, go to step  13.
  11. Check ground circuit for high resistance or open circuit. Repair as necessary. After repairs, go to step  16. If circuit is okay, go to step  13.
  12. Check for poor connections at A/C pressure sensor. Repair as necessary. After repairs, go to step  16. If circuit is okay, go to step  14.
  13. Check for poor connections at PCM. Repair as necessary. After repairs, go to step  16. If circuit is okay, go to step  15.
  14. Replace A/C refrigerant pressure sensor. After replacing sensor, go to step  16.
  15. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  16. Using scan tool, clear DTCs. Operate vehicle within conditions for setting this DTC. If DTC resets, go to step  2. If DTC does not reset, system is okay.
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