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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 26 (Engine Controls Self-Diagnostics - 5.0L & 5.7L) >> Diagnostic Tests >> DTC P0449: EVAP Vent Solenoid Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2001 GMC Savana, 2001 Chevrolet RV Cutaway, 2001 Chevrolet Cutaway, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing powertrain diagnostic system check, go to next step.
  2. Turn ignition on, engine off. Using scan tool, command EVAP vent valve on and off. If a click is heard or felt from EVAP vent valve when it is commanded on and off, go to next step. If a click is not heard or felt from EVAP vent valve when it is commanded on and off, go to step  4.
  3. Observe FREEZE FRAME/FAILURE RECORDS data for this DTC. Turn ignition off for 30 seconds. Start engine. Operate vehicle within code enable criteria or as close to FREEZE FRAME/FAILURE RECORDS data as possible. If DTC failed this ignition cycle, go to next step. If DTC did not fail this ignition cycle, see INTERMITTENT TROUBLE CODE DETERMINATION  under ON-BOARD DIAGNOSTICS under SELF-DIAGNOSTIC SYSTEM.
  4. Turn ignition off. Disconnect EVAP vent valve connector. See COMPONENT LOCATIONS . Turn ignition on, engine off. Using test light connected to ground, probe EVAP vent valve connector terminal "A" (Pink wire). If test light is on, go to next step. If test light is off, go to step  11.
  5. Connect a test light between EVAP vent valve connector terminals. 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. Check White wire between EVAP vent valve for short to voltage or open. If problem was found, repair as necessary. After repairs, go to step  14. If problem was not found, go to step  10.
  8. Check White wire between EVAP vent valve for short to ground. If problem was found, repair as necessary. After repairs, go to step  14. If problem was not found, go to step  10.
  9. Check EVAP vent valve connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  14. If problem was not found, go to step  12.
  10. Check PCM connectors for poor connections. If problem was found, repair as necessary. After repairs, go to step  14. If problem was not found, go to step  13.
    11. NOTE: If ENG-1 fuse (20-amp) is open, inspect all related circuits for a short to ground. ENG-1 fuse is located in underhood fuse block.
  11. Repair open or short to ground in Pink wire between EVAP vent valve and ENG-1 fuse. After repairs, go to step  14.
  12. Replace EVAP vent valve. After repairs, go to step  14.
  13. Replace PCM. Program PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  14. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate vehicle within code enable criteria. If DTC runs and passes, go to next step. If DTC does not run and pass, go to step  2.
  15. Using scan tool, observe stored information. If scan tool displays any DTCs that have not been diagnosed, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not display any DTCs, system is okay.
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