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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 P0420 or P0430 >> Circuit/System Verification

Circuit/System Verification

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  1. Verify that no other DTCs are set.
  2. Operate the vehicle within the Conditions for Running the DTC while observing the scan tool Catalyst monitor Not At Idle Test Conditions Met parameter. The parameter will change to Yes when the OFF Idle Conditions have been met.
    • If not the specified value, operate the vehicle within the OFF Idle Conditions.
  3. When the parameter has changed to Yes and the conditions are safe, stop and idle the vehicle in gear.
  4. Apply the service brake.
  5. Monitor the scan tool Catalyst Monitor Test State parameter. When the parameter indicates Active, the Catalyst Monitor Test is running.
  6. Continue to monitor the parameter. When the parameter indicates Inactive, the Catalyst Monitor Test has completed.
  7. When the test has completed, the Catalyst Monitor Test Counter Bank 1 or Bank 2 parameter will increment by one and the Catalyst Monitor Test Result Bank 1 or Bank 2 parameter will indicate Pass, Fail, or No Decision.
    • If no decision has been made, repeat steps 2-6 until the Test Result parameter indicates a Pass or Fail.
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