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HOMESERVICE MANUALSCHEVROLET1999CHEVY EXPRESS G1500, VAN CARGO, 5.7 RREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - TESTS W/CODES - DTC P0453-P0656DTC P0530DTC P0530: A/C REFRIGERANT PRESSURE SENSOR CIRCUIT (5.7L "F" & "Y" BODIES)DIAGNOSTIC PROCEDURES
1999 Chevrolet Chevy Express G1500, Van Cargo, 5.7 R

Diagnostic Procedures

1999 Chevrolet Chevy Express G1500, Van Cargo, 5.7 RSECTION Diagnostic Procedures
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS INTRODUCTION article. After performing OBD system check, go to next step.
  2. Start and operate engine at idle. Using scan tool, monitor FAILED THIS IGNITION under DTC status for DTC P1635. If DTC P1635 failed this ignition cycle, diagnose DTC. If DTC does not fail this ignition, go to next step.
  3. Turn ignition on, with engine on. Using scan tool, monitor A/C high side. If A/C high side voltage is 0.1-1.8 volts, go to next step. If A/C high side voltage is not 0.1-1.8 volts, go to step  5.
  4. Turn ignition on, with engine off. Review FREEZE FRAME data and note parameters. Operate vehicle within FREEZE FRAME parameters. If test indicates that this test failed this ignition cycle while operating vehicle, go to next step. If test does not indicate that this test failed this ignition cycle, see DIAGNOSTIC AIDS .
  5. Disconnect A/C refrigerant pressure sensor harness connector. If scan tool indicates that A/C high side voltage is less than one volt, go to next step. If A/C high side voltage is not less than one volt, go to step  10.
  6. Using DVOM, check voltage between A/C refrigerant pressure sensor 5-volt reference circuit and battery ground. If voltage reading is about 5 volts, go to next step. If voltage reading is not about 5 volts, go to step  11.
  7. Using DVOM, check voltage between A/C refrigerant pressure sensor 5-volt reference circuit and sensor ground. If voltage reading is about 5 volts, go to next step. If voltage reading is not about 5 volts, go to step  12.
  8. Connect a fused jumper wire between A/C refrigerant pressure sensor 5-volt reference circuit to sensor signal ground. Scan tool should read about 5 volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step  13.
  9. Repair faulty A/C refrigerant pressure sensor connection or replace faulty sensor. After repairs, go to step  14.
  10. Repair short to voltage in A/C refrigerant pressure sensor signal circuit. After repairs, go to step  14.
  11. Repair 5-volt reference circuit to pressure sensor. After repairs, go to step  14.
  12. Repair ground circuit to pressure sensor. After repairs, go to step  14.
  13. Repair signal circuit to pressure sensor. After repairs, go to next step.
  14. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0530. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step  2.
  15. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.