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Home >> Saturn >> 2000 >> LS Standard >> 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 (OBD) 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, monitor A/C high side pressure. If scan tool reading is less than 0.2 volt, go to next step. If scan tool reading is within 0.2-4.0 volts, problem is intermittent. See DIAGNOSTIC AIDS . If scan tool reading is greater than 4 volts, go to step  9.
  3. Disconnect A/C pressure sensor harness connector. Using a jumper wire, connect jumper between A/C pressure sensor harness connector terminals "B" (Gray wire) and "C" (Red/Black wire). See WIRING DIAGRAMS article. If scan tool reading is not greater than 4 volts, go to next step. If scan tool reading is greater than 4 volts, check for terminal tightness. Repair as necessary. If terminals are okay, replace A/C pressure sensor.
  4. Remove jumper wire. Using a DVOM, check voltage between ground and A/C pressure sensor harness connector terminal "B" (Gray wire). If voltage reading is 4-6 volts, go to step  6. If voltage reading is not 4-6 volts, go to next step.
  5. Turn ignition off. Disconnect PCM harness connector J2. Check for continuity between ground and A/C pressure sensor harness connector terminal "B" (Gray wire). If continuity exists, repair short in circuit. If continuity does not exist, check for open in circuit. Repair as necessary. If circuit is okay, replace PCM.
  6. Turn ignition off. Disconnect PCM harness connector J1. Check for continuity between ground and PCM harness connector J1 terminal No. 49 (Red/Black wire). If continuity does not exist, repair open in circuit. If continuity exists, go to next step.
  7. Check for continuity between ground and A/C pressure sensor harness connector terminal "C" (Red/Black wire). If continuity exists, repair short in circuit. If continuity does not exist, go to next step.
  8. Check for short between harness connector terminals "A" (Black wire) and "C" (Red/Black wire) circuits. Repair as necessary. If circuits are okay, check for terminal tightness at harness connectors. Repair as necessary. If terminals are okay, replace PCM.
  9. Disconnect A/C pressure sensor harness connector. Check scan tool reading. If scan tool reading is less than 0.2 volt, go to next step. If scan tool reading is not less than 0.2 volt, go to step  11.
  10. Using a DVOM, check voltage between A/C pressure sensor harness connector terminals "A" (Black wire) and "B" (Gray wire). If voltage reading is 4-6 volts, replace pressure sensor. If voltage reading is not 4-6 volts, check for open in Black wire circuit. Repair as necessary. If circuit is okay, check for terminal tightness at harness connectors. Repair as necessary. If terminals are okay, replace PCM.
  11. Turn ignition off. Disconnect PCM harness connector J1. Turn ignition on. Using DVOM, check for voltage at A/C pressure sensor harness connector terminal "C" (Red/Black wire). If voltage is present, repair short to voltage in circuit. If voltage is not present, check A/C pressure sensor harness connector terminals "B" (Gray wire) and "C" (Red/Black wire) circuits for short to each other. Repair as necessary. If circuit is okay, replace PCM.
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