LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 116 (Engine Controls - Self-Diagnostics - 4.0L) >> Diagnostic Tests >> DTC P0443: EVAP Purge Solenoid Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition on, with engine off. Using scan tool, command the EVAP purge valve to 50 percent and then to 0 percent. Do you hear or feel a clicking from EVAP purge valve when valve is commanded to 50 percent? If yes, go to next step. If no, go to step  4.
  3. Using scan tool, observe FREEZE FRAME and/or FAILURE RECORDS data for this DTC. Turn ignition off for 30 seconds. Ensure engine is idling. Operate vehicle within Conditions for Running DTC or as close to FREEZE FRAME and/or FAILURE RECORDS data as possible. Does the DTC fail this ignition cycle? If yes, go to next step. If no, fault may be intermittent. See INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
  4. Turn ignition off. Disconnect EVAP purge valve connector. Turn ignition on. Using a test lamp connected to a good ground, probe the ignition voltage circuit at EVAP purge valve harness connector. Does the test lamp illuminate? If yes, go to next step. If no, go to step  11.
  5. Connect a test lamp between the control circuit and ignition voltage circuit of EVAP purge valve harness connector. With scan tool, command the EVAP purge valve to 0 percent. Is test lamp illuminated? If yes, go to step  8. If no, go to next step.
  6. Using scan tool, command EVAP canister purge valve to 50 percent. Does the test lamp illuminate or pulse when the purge valve is commanded to 50 percent? If yes, go to step  9. If no, go to next step.
  7. Test the control circuit of the EVAP purge valve for an open or short to voltage. Did you find and correct the condition? If yes, go to step  14. If no, go to step  10.
  8. Test the control circuit of the EVAP purge valve for a short to ground. Did you find and correct the condition? If yes, go to step  14. If no, go to step  13.
  9. Check for poor connections at EVAP purge valve connector. Did you find and correct the condition? If yes, go to step  14. If no, go to step  12.
  10. Check for poor connections at PCM connectors. Did you find and correct the condition? If yes, go to step  14. If no, go to step  13.
  11. Repair the ignition voltage circuit of the EVAP purge valve. After repairs, go to step  14.
  12. Replace EVAP canister purge valve. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to step  14.
  13. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  14. Use the scan tool in order to clear the DTCs. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  15. With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
scientia non olet · About LEMON Manuals