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Home >> Isuzu >> 1996 >> Hombre S >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Circuit Testing >> DTC P0530 - A/C Refrigerant Pressure Sensor Circuit >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, check A/C pressure. If actual A/C pressure matches A/C pressure reading on scan tool, check A/C system and repair as necessary. If actual A/C pressure does not match A/C pressure reading on scan tool, go to next step.
  3. If any MAP sensor or TP sensor DTCs are set, diagnose DTCs as necessary. If no MAP sensor or TP sensor DTCs are set, go to next step.
  4. If A/C high side pressure is 373 psi (4 volts) or less, go to next step. If A/C high side pressure is more than 373 psi (4 volts), go to step 11).
  5. If A/C high side pressure is less than 9 psi (.2 volt), go to next step. If A/C high side pressure is 9 psi (.2 volt) or more, go to step 13).
  6. Disconnect A/C refrigerant pressure sensor connector. Connect a jumper wire between 5-volt reference and signal circuit terminals at sensor harness connector. Using scan tool, check A/C high side pressure value. If value is more than 433 psi (4.6 volts), go to step 9). If value is 433 psi (4.6 volts) or less, go to next step.
  7. Remove jumper wire. Using DVOM, measure voltage between ground and 5-volt reference circuit terminal at sensor harness connector. If voltage is more than 4.6 volts, go to step 10). If voltage is 4.6 volts or less, go to next step.
  8. Repair open in 5-volt reference circuit. After repair is completed, go to step 13).
  9. Replace A/C refrigerant pressure sensor. After repair is completed, go to step 13).
  10. Check for an open in A/C pressure sensor signal circuit. Repair as necessary. After repair is completed, go to step 13). If circuit is okay, go to step 12).
  11. Check for an open in A/C pressure sensor signal circuit. Repair as necessary. After repair is completed, go to step 13). If circuit is okay, go to step 9).
  12. Replace PCM. Program replacement PCM using required equipment. After repair is completed, go to next step.
  13. Using scan tool, select CLEAR INFO or CLEAR DTCS function to clear DTCs. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Operate vehicle within conditions required for setting this DTC. Select SPECIFIC DTC function then enter DTC P0530. If scan tool indicates TEST RAN AND PASSED, go to next step. If scan tool does not indicate TEST RAN AND PASSED, repeat step 2).
  14. If any other DTCs are set, diagnose DTCs as necessary. If no other DTCs are set, no problem is indicated at this time. See DIAGNOSTIC AIDS.
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