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Home >> Honda >> 2000 >> CR-V SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Controls - Self-Diagnostics - 2.2L) >> Diagnostic Trouble Code Identification >> DTC P0530: A/C Refrigerant Pressure Sensor Circuit >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Isuzu Hombre. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic II (OBD-II) system check. See ON-BOARD DIAGNOSTIC II (OBD-II) SYSTEM CHECK in SELF-DIAGNOSTICS - INTRODUCTION article. After performing OBD-II system check, go to next step.
  2. Install Tech 2 scan tool. Turn ignition on, with engine off. Using scan tool, check for MAP or TP sensor DTCs. If DTCs are present, go to appropriate DTC for diagnosis. If MAP or TP sensor DTCs are not present, go to next step.
  3. Scan A/C high side value. If high side value is greater than 363 psi (4.0 volts), go to next step. If high side value is 363 psi (4.0 volts) or less, go to step  5.
  4. Unplug A/C pressure sensor connector. If high side value is now less than 76 psi (1.0 volt), go to step  6. If value is not as described, go to step  11.
  5. If A/C high side value is less than zero psi (0.20 volt), go to step  7. If high side value is greater than zero (0.20 volt), go to step  8.
  6. Connect positive DVOM lead to battery voltage. Probe A/C pressure sensor ground circuit (Black wire) with negative DVOM lead. If battery voltage is displayed, go to step  9. If not, go to step  10.
  7. Unplug A/C pressure sensor connector. With DVOM to ground, probe A/C pressure sensor harness 5-volt reference circuit (Gray wire). If DVOM displays about 5 volts, go to step  12. If about 5 volts is not displayed, go to step  13.
  8. Start engine. Turn A/C switch to OFF position. If A/C clutch remains engaged, go to step  14. If not, go to step  25.
  9. Replace A/C pressure sensor, and go to step  25.
  10. Repair open or poor connection in pressure sensor ground circuit (Black wire). After repair, go to step  25.
  11. If voltage displayed on scan tool with pressure sensor connector unplugged is greater than 4-6 volts, go to step  16. If voltage displayed is less than specification, go to step  17.
  12. Jumper A/C pressure sensor harness connector 5-volt reference circuit (Gray wire) to refrigerant pressure signal circuit (Red/Black wire). If scan tool pressure sensor high side parameter now displays greater than 421 psi (4.6 volts), go to step  9. If not greater than specification, go to step  18.
  13. Repair open or poor connection in pressure sensor 5-volt reference circuit (Gray wire). After repairs, go to step  25.
  14. Unplug A/C relay. With test light connected to battery voltage, probe A/C relay harness clutch control (driver) circuit terminal (Dark Green/White wire). If test light illuminates, go to step  19. If not, go to step  20.
  15. Replace PCM. Prior to replacement, check PCM terminals, connectors and wiring harness for damage. Program replacement PCM using appropriate equipment. See PROGRAMMING . After repair, go to step  25.
  16. Check for short to voltage on pressure sensor signal circuit (Red/Black wire). If circuit requires repair, repair as necessary. After repairs, go to step  25. If circuit does not require repair, go to step  15.
  17. Check pressure sensor signal circuit (Red/Black wire) for short to 5-volt reference circuit (Gray wire) and repair as necessary. After repair, go to step  25. If circuit is okay, go to step  15.
  18. With positive DVOM lead connected to positive battery voltage, probe A/C pressure sensor signal circuit (Red/Black wire) at pressure sensor connector with negative lead. If voltage is greater than 0.5 volt, go to step  21. If voltage is less than 0.5 volt, go to step  22.
  19. Check A/C clutch relay control circuit (Dark Green/White wire) for short to ground between PCM and relay connector. Repair as necessary. After repair, go to step  25. If circuit is okay, go to step 15.
  20. If A/C clutch disengaged when relay was removed, go to step  23. If not, go to step  24.
  21. Check for short to ground or short to sensor ground in A/C pressure sensor signal circuit (Red/Black wire). If circuit requires repair, repair as necessary and go to step  25. If circuit does not require repair, go to step  15.
  22. Check for open in pressure sensor signal circuit (Red/Black wire). Repair circuit as necessary. After repairing circuit, go to step  25. If circuit is okay, go to step  15.
  23. Replace A/C compressor relay. After replacing compressor, go to next step.
  24. Repair short to battery voltage in A/C compressor clutch ignition feed circuit (Dark Green wire) or faulty A/C compressor clutch. After repairing circuit, go to step  25.
  25. Clear DTCs. Start engine and idle to normal operating temperature. Operate vehicle within conditions which set code. If scan tool indicates this code diagnostic ran and passed, go to next step. If not, repeat step  2.
  26. Check for additional codes. If additional codes are set, service as necessary. If not, system is okay, see DIAGNOSTIC AIDS .
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