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Home >> Chevrolet >> 2000 >> Venture Plus >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P0530: A/C Refrigerant Pressure Sensor Circuit >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, observe A/C pressure sensor parameter. If A/C pressure sensor parameter is within 0.1- 4.9 volts, see DIAGNOSTIC AIDS . If A/C pressure sensor parameter is not within 0.1-4.9 volts, go to next step.
  3. Turn ignition off. Disconnect A/C pressure sensor harness connector. Turn ignition on, with engine off. Using scan tool, observe A/C pressure sensor parameter. If A/C pressure sensor parameter is less than 0.1 volt, go to next step. If A/C pressure sensor parameter is not less than 0.1 volt, go to step  10.
  4. Turn ignition off. Connect a fused jumper wire between A/C pressure sensor 5-volt reference "B" circuit and signal circuit. Turn ignition on, with engine off. Using scan tool, observe A/C pressure sensor parameter. If A/C pressure sensor parameter is greater than 4.9 volts, go to next step. If A/C pressure sensor parameter is not greater than 4.9 volts, go to step  8.
  5. Disconnect fused jumper wire. Check voltage between A/C pressure sensor 5-volt reference "B" circuit 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. Turn ignition off. 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  11.
  7. Check for short to voltage in A/C pressure sensor 5-volt reference "B" circuit. Repair as necessary. After repairs, go to step  16. If circuit is okay, go to step  13.
  8. Check A/C pressure sensor 5-volt reference "B" 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 next step.
  9. Check A/C pressure sensor signal circuit for short to ground, high resistance, or an open circuit. Repair as necessary. After repairs, go to step  16. If circuit is okay, go to step  13.
  10. Check A/C pressure sensor signal circuit for short to voltage. Repair as necessary. After repairs, go to step  16. If circuit is okay, go to step  13.
  11. Turn ignition off. Disconnect PCM harness connector. Check A/C pressure sensor ground circuit for high resistance or an 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 harness connector. Repair as necessary. After repairs, go to step  16. If connections are okay, go to step  14.
  13. Check for poor connections at PCM harness connector. Repair as necessary. After repairs, go to step  16. If connections are okay, go to step  15.
  14. Replace A/C 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. Recheck DTCs. If this DTC resets, go to step  2. If this DTC does not reset, system is okay.
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