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Home >> Saturn >> 2007 >> Relay 3.9 1 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - DTC P0442 To DTC P2544 >> DTC P0446 >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON and fuel cap removed, verify the FTP sensor parameter is between 1.3-1.7 volts.
    • If greater than the specified range, refer to the FTP sensor section in CIRCUIT/SYSTEM TESTING under FUEL SYSTEM DIAGNOSIS in Engine Controls and Fuel - 3.9L - Relay Troubleshooting & Diagnosis article.
  2. With the engine running, the EVAP canister vent solenoid valve open, and the EVAP canister purge solenoid valve commanded to 100 percent, the fuel tank vacuum should not increase to more than 8 inches H2O.
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