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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 P0442 >> Circuit/System Testing

Circuit/System Testing

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NOTE:
  • Refer to the GE 41413-A  Evaporative Emissions System Tester (EEST) operation manual for detailed instructions in Evaporative Emission System Diagnosis .
  • Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize or produce smoke.
  • The fuel level should be between 1/4 and 3/4 of a tank.
  • Ensure that the underbody temperature of the vehicle and the tester are similar.
  1. Disconnect the purge tube at the quick connector on the EVAP canister side of the Q12 evaporative emission purge solenoid valve and install the CH 48096  EVAP Service Access Port Tool.
  2. Connect the GE 41413-A  Evaporative Emissions System Tester (EEST) to the CH 48096  EVAP Service Access Port Tool.
  3. Using a scan tool close the EVAP vent valve to seal the EVAP system.
  4. Use the flow meter on the GE 41413-A  Evaporative Emissions System Tester (EEST), calibrated to 0.51 mm (0.020 in) to determine that there is no leak in the EVAP system.
    • If a leak is detected, use the GE 41413-A  Evaporative Emissions System Tester (EEST) to apply smoke to the EVAP system at the service port until the leak is located using the GE-41413-SPT  High Intensity White Light.
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