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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 364 (Engine Controls And Fuel - 5.3L, 6.0L & 6.2L - DTC P0443 Through DTC P3449 And Troubleshooting) >> 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 Sensor parameter is between 1.3-1.7 volts.
  2. Install the fuel cap.
  3. Engine running, the EVAP canister vent solenoid valve open, command the EVAP canister purge solenoid valve to 100 percent with a scan tool. The reading should not increase to greater than -15 mmHg (-8 inches H2O).
    • If greater than the specified range, go to Restriction  in Circuit/System Testing.
  4. Using the scan tool, decrease the canister purge duty cycle from 100 percent to 0 percent. 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 Restriction  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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