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Home >> Isuzu >> 2000 >> Rodeo LSE, 2.2 D >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.2L >> Diagnostic Trouble Code Identification >> DTC P0533: A/C Refrigerant Pressure Sensor Circuit High >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic II (OBD-II) system check. See SELF-DIAGNOSTICS - INTRODUCTION article. Go to next step.
  2. Turn ignition on. Review and record FAILURE RECORDS data, then clear DTCs. Operate vehicle within FAILURE RECORDS data recorded. Check for DTC P0533. If scan tool indicates that DTC P0533 RAN AND PASSED, go to DIAGNOSTIC AIDS . If scan tool reading is not as indicated, go to next step.
  3. Turn ignition off. Disconnect A/C refrigerant pressure sensor. Start vehicle and monitor A/C pressure value. If reading holds steady at less than .1 volt, go to step  5. If reading does not hold steady, go to next step.
  4. Check A/C pressure sensor signal circuit between PCM and A/C pressure sensor for a short to voltage. If short to voltage is found, repair as necessary. Retest system. If no problem is found, go to next step.
  5. Check A/C pressure sensor signal circuit between PCM and A/C pressure sensor for a short to ground or an open circuit. Repair as necessary. If circuit is okay, go to next step.
  6. Check A/C pressure sensor 5-volt reference circuit between PCM and A/C pressure sensor for a shorted or open condition. Repair as necessary. If circuit is okay, go to next step.
  7. Turn ignition off. Connect a DVOM between 5-volt reference terminal of A/C pressure sensor connector and ground. Turn ignition on. If DVOM reading is about 5 volts, go to next step. If reading is not about 5 volts, go to step  12.
  8. Turn ignition off. Using a fused jumper wire, connect A/C pressure sensor harness connector 5-volt reference and A/C pressure sensor signal terminals. Turn ignition on. Using scan tool, observe A/C pressure sensor value. If value is about 5 volts, go to next step. If value is not about 5 volts, go to step  12.
  9. Using DVOM, measure resistance across A/C pressure sensor terminals. If an open condition is found, replace A/C pressure sensor. If no problem is found, go to next step.
  10. Turn ignition off. Using DVOM, connect leads between A/C pressure sensor connector sensor ground and 5-volt reference terminals. Turn ignition on. If reading is about 5 volts, go to next step. If reading is not about 5 volts, go to step  12.
  11. Replace A/C refrigerant pressure sensor. Retest system.
  12. Replace and reprogram PCM using required equipment. See PROGRAMMING . Retest system.
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