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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. Go to next step.
    2. NOTE: This step must be performed in an area with an ambient temperature that is greater than 32°F (0°C).
  2. Install scan tool. Turn ignition on, engine off. Using scan tool, observe A/C HIGH SIDE PRESSURE parameter in Powertrain Control Module (PCM) Engine Data 2 list. If scan tool indicates A/C HIGH SIDE PRESSURE parameter is 0.2-3.76 volts, problem is intermittent. Check wiring and connections. If scan tool indicates A/C HIGH SIDE PRESSURE parameter is not 0.2-3.76 volts, go to next step.
  3. Turn ignition off. Disconnect A/C refrigerant pressure sensor. Turn ignition on, engine off. Using scan tool, observe A/C HIGH SIDE PRESSURE parameter. If scan tool indicates A/C HIGH SIDE PRESSURE parameter is less than 0.2 volt, go to next step. If scan tool indicates A/C HIGH SIDE PRESSURE parameter is greater than 0.2 volt, go to step  10.
  4. Turn ignition off. Connect a 3-amp fused jumper wire between A/C refrigerant pressure sensor 5-volt reference circuit and signal circuit. Turn ignition on, engine off. Using scan tool, observe A/C HIGH SIDE PRESSURE parameter. If scan tool indicates A/C HIGH SIDE PRESSURE parameter is greater than 3.76 volts, go to next step. If scan tool indicates A/C HIGH SIDE PRESSURE parameter is less than 3.76 volts, go to step  8.
  5. Disconnect fused jumper wire. Measure voltage between A/C refrigerant pressure sensor 5-volt reference circuit and low reference circuit. If voltage measures less than 5.1 volts, go to next step. If voltage measures greater than 5.1 volts, go to step  7.
  6. Turn ignition off. Disconnect negative battery cable. Measure resistance from A/C refrigerant pressure sensor low reference circuit to ground. If resistance measures less than 5 ohms, go to step  12. If resistance measures greater than 5 ohms, go to step  11.
  7. Test A/C refrigerant pressure sensor 5-volt reference circuit for a short to voltage. Repair as necessary, then go to step  16. If circuit is okay, go to step  13.
  8. Test A/C refrigerant pressure sensor 5-volt reference circuit for a short to ground, a high resistance, or an open. Repair as necessary, then go to step  16. If circuit is okay, go to next step.
  9. Test A/C refrigerant pressure sensor signal circuit for a short to ground, a high resistance, or an open. Repair as necessary, then go to step  16. If circuit is okay, go to step  13.
  10. Test A/C refrigerant pressure sensor signal circuit for a short to voltage. Repair as necessary, then go to step  16. If circuit is okay, go to step  13.
  11. Test A/C refrigerant pressure sensor low reference circuit for a high resistance or an open. Repair as necessary, then go to step  16. If circuit is okay, go to step  13.
  12. Inspect for poor connections at A/C refrigerant pressure sensor harness connector. Repair as necessary, then go to step  16. If connections are okay, go to step  14.
  13. Inspect for poor connections at PCM harness connector. Repair as necessary, then go to step  16. If connections are okay, go to step  15.
  14. Replace A/C refrigerant pressure sensor. See PRESSURE SENSOR  under REMOVAL & INSTALLATION. After replacement, go to step  16.
  15. Replace and reprogram PCM. See POWERTRAIN CONTROL MODULE in REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. After replacement, go to next step.
  16. Use scan tool in to clear DTCs. Start engine. Request A/C operation. If DTC P0530 resets, go to step  2. If DTC P0530 does not reset, system is okay.
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