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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 P0496 >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition ON, engine OFF, observe the Fuel Tank Pressure sensor parameter with a scan tool. The reading should not display negative inches of H2O.
    • If not the specified value, remove the gas cap. If vacuum is gone inspect and repair any restriction or blockage in the vent side of the EVAP system.
  2. Reinstall the gas cap then seal the EVAP system using the Purge/Seal function with a scan tool.
  3. Start the engine.
  4. Observe the FTP sensor with a scan tool. The Fuel Tank Pressure Sensor parameter should be less than 1.7 volts after 90 seconds.
    • If the Fuel Tank Pressure Sensor parameter is greater than the specified range, replace the EVAP canister purge solenoid valve.
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