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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 107 (Engine Controls - Self-Diagnostics - 3.5L) >> Diagnostic Tests >> DTC P0443: EVAP Purge Solenoid Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue and 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. See CONDITIONS FOR RUNNING DTC . If DTC resets, go to next step. If DTC does not reset, 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 light connected to a good ground, probe the ignition voltage circuit at EVAP purge valve harness connector. If test light illuminates, go to next step. If test light does not illuminate, go to step  11.
  5. Connect a test light 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 light illuminated? If yes, go to step  9. If no, go to next step.
  6. Using scan tool, command EVAP canister purge valve to 50 percent. If test light illuminates or pulses, go to step  8. If test light does not illuminate or pulse, 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. Repair connector as necessary. After repairs, go to step  14. If connector is okay, go to step  12.
  10. Check for poor connections at PCM connectors. Repair connectors as necessary. After repairs, go to step  14. If connectors are okay, 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. After repairs, go to step  14.
  13. Replace PCM. Program replacement PCM. See PROGRAMMING . After repairs, go to next step.
  14. Turn ignition off. Reconnect all disconnected connectors. Turn ignition on. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate vehicle within conditions for running the DTC. See CONDITIONS FOR RUNNING DTC . If DTC runs and passes, go to next step. If DTC resets, go to step  2.
  15. Using scan tool, check for any other DTCs that are set. If no other DTCs are set, system is okay. If any other DTCs are set, repair DTCs as necessary. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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