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Home >> Oldsmobile >> 2000 >> Intrigue GL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0443: EVAP Purge Solenoid Control Circuit >> Diagnostic Procedures

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, command purge solenoid valve on and off. If purge valve turns on and off with each command, go to next step. If purge valve does not turn on and off with each command, go to step  5.
  3. Turn ignition off. Disconnect PCM harness connector. Using DVOM on 10-amp scale, measure current between ground and valve control circuit at PCM harness connector for 2 minutes. If current draw is 0.1-0.75 amp, see DIAGNOSTIC AIDS . If current draw is not 0.1-0.75 amp, go to next step.
  4. Turn ignition off. Disconnect solenoid valve connector. Using DVOM, check resistance between ground and valve control circuit at PCM harness connector. If resistance is infinite, go to step  11. If resistance is not infinite, go to step  9.
  5. Turn ignition off. Disconnect solenoid valve connector. Connect test light between valve harness connector terminals. Turn ignition on. Using scan tool, command valve on and off. If test light turns on and off with each command, go to step  8. If test light does not turn on and off with each command, go to next step.
  6. With test light connected to ground, probe valve harness connector switched battery feed circuit. If test light is on, go to next step. If test light is off, go to step  10.
  7. Turn ignition off. Reconnect solenoid valve connector. Disconnect PCM harness connector. Jumper main relay control circuit to ground. Using a fused jumper wire connected to ground, probe valve control circuit at PCM harness connector. If solenoid valve operates, go to step  12. If solenoid valve does not operate, go to step  9.
  8. Check connections at solenoid valve. Repair as necessary. After repairs, go to step  14. If connections are okay, go to step  11.
  9. Repair EVAP purge solenoid valve control circuit. After repairs, go to step  14.
  10. Repair switched battery feed circuit to EVAP purge solenoid purge valve. After repairs, go to step  14.
  11. Replace EVAP purge solenoid valve. After replacing solenoid valve, go to step  14.
  12. Check for poor connections and terminal tension at PCM harness connector. Repair as necessary. After repairs, go to step  14. If connections and terminals are okay, go to next step.
  13. Replace PCM. New PCM must be programmed with theft deterrent module frequency code currently on vehicle. After replacing PCM, go to next step.
  14. Using scan tool, clear DTCs. Turn ignition off for 15 seconds. Start engine and operate vehicle. Check for DTCs. If DTC P0443 is set, go to step  2. If DTC P0443 is not set, go to next step.
  15. Using scan tool, review CAPTURED INFO function. If any undiagnosed DTCs are displayed, diagnose affected DTC. If no other DTCs are present, system is okay.
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