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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 508 (Engine Controls/Fuel - 5.3L, 6.0L, 6.2L - DTC P0420 To DTC P3449 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0446 >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition ON and fuel cap removed, verify the scan tool fuel tank pressure (FTP) sensor parameter is between 1.3-1.7 V.
    • If not within the specified range, go to the FTP sensor section in Circuit/System Testing.
  2. Install the fuel cap.
  3. Engine running, the EVAP vent solenoid valve open, command the EVAP purge solenoid valve to 100 % with a scan tool. The reading should not increase to greater than -15 mm Hg (-8 in H2O).
    • If greater than the specified range, go to the restriction section in Circuit/System Testing.
  4. Using the scan tool, decrease the canister purge duty cycle from 100 % to 0 %. The vacuum should decrease to near zero.
    • If the fuel tank vacuum does not return to zero or appears to decrease too slowly go to the restriction section in Circuit/System Testing.
  5. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
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