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Home >> Saturn >> 2000 >> LS2 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0446: EVAP Vent Solenoid Control System >> Diagnostic Procedures
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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 EVAP vent solenoid on. If solenoid clicks when commanded on and off, problem is intermittent. See DIAGNOSTIC AIDS . If solenoid does not click when commanded on and off, go to next step.
  3. Check ENG CNTL 1 fuse located in underhood fuse block. If fuse is blown, check for grounded circuit (Orange wire) between EVAP vent solenoid and fuse block. Repair as necessary and replace fuse. If fuse is okay or after repairs, go to next step.
  4. Disconnect EVAP vent valve solenoid harness connector. Connect a test light between solenoid harness 2-pin connector terminals. Using scan tool, command EVAP vent solenoid on and off. If test light turns on and off as commanded, replace EVAP vent solenoid. If test light does not turn on and off as commanded, check for short to ground in circuit between vent solenoid and ECM. Repair as necessary. If circuit is okay, replace ECM.
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