LEMON Manuals: Even more car manuals for everyone
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 P0449: EVAP Canister Vent 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. Using scan tool, command EVAP vent valve ON and OFF. If a clicking noise is felt or heard from EVAP vent valve, go to next step. EVAP canister vent valve is located near fuel tank. If a clicking noise is not felt or heard from EVAP vent valve, 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. Start engine. 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 vent valve connector. Turn ignition on. Using a test light connected to ground, probe Pink wire at EVAP vent 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 Pink and White wires at EVAP vent valve harness connector. Using scan tool, command EVAP vent valve ON and OFF. If test light turns on and off with each command, go to step  9. If test light does not turn on and off with each command, go to next step.
  6. If test light remains on with each command, go to step  8. If test light does not remain on with each command, go to next step.
  7. Test the control circuit of the EVAP vent solenoid for a short to voltage or an open. 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 vent valve for a short to ground. Did you find and correct the condition? If yes, go to step  14. If no, go to step  10.
  9. Check for poor connections at EVAP vent 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 EVAP vent valve ignition voltage circuit for open or a short to ground. After repairs, go to step  14.
  12. Replace EVAP canister vent valve. After repairs, go to step  14.
  13. Replace PCM. Program replacement PCM. See PROGRAMMING . After repairs, go to next step.
  14. Use scan tool to clear DTCs. Turn ignition off for 30 seconds. Operate vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC . Does the DTC run and pass? If yes, go to next step. If no, 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 .
scientia non olet · About LEMON Manuals