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Home >> Saturn >> 2000 >> SW2 Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0448: EVAP Vent Valve Control Circuit Shorted >> Diagnostic Procedures
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Diagnostic Procedures

  1. Turn ignition on, with engine off. Using scan tool, command EVAP solenoid on and monitor EVAP VENT - HIGH VOLT test. If scan tool indicates TEST FAIL, go to next step. If scan tool does not indicate TEST FAIL, problem is intermittent. See DIAGNOSTIC AIDS  .
  2. Raise vehicle to about chest height. Remove left rear inner fender well. Disconnect EVAP vent solenoid harness connector. Connect a Noid Light (SA9194E) to EVAP vent solenoid harness connector. Using scan tool, command EVAP vent solenoid on and monitor EVAP VENT - HIGH VOLT test. If scan tool does not indicate TEST PASS, go to next step. If scan tool indicates TEST PASS, replace EVAP vent solenoid.
  3. Check for short to voltage in EVAP vent solenoid circuit (White wire) to PCM. Repair as necessary. If circuit is okay, replace PCM.
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