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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 P0443 >> Circuit/System Verification

Circuit/System Verification

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  1. Ignition ON, engine OFF, command the EVAP purge solenoid to 50 % with a scan tool. You should hear the solenoid clicking when commanded to 50 %.
  2. Engine Idling, command the EVAP purge solenoid from 0 to 50 % and back to 0 % with a scan tool while observing the following control circuit status parameters:
    • EVAP Purge Solenoid Valve Control Circuit Low Voltage Test Status
    • EVAP Purge Solenoid Valve Control Circuit Open Test Status
    • EVAP Purge Solenoid Valve Control Circuit High Voltage Test Status

      Each parameter should display OK or Not Run.

  3. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.
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