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Home >> GMC >> 2002 >> Yukon Denali >> Repair and Diagnosis >> External Pages >> Different car >> Section 343 (ENGINE CONTROLS - SELF-DIAGNOSTICS - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline) >> Drive Cycles >> Inspection/Maintenance Catalyst System Set Procedure >> Test Description

Test Description

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The numbers below refer to the step numbers in the diagnostic procedure.

  1. 1

    Make sure that you perform the Inspection/Maintenance System Check before performing this test. Failure to do so may result in difficulty updating the status to YES.

  2. 2

    Perform the Catalyst Test during the idle period immediately following the cruise period.

  3. 3

    This step identifies a first failure of a type "B" DTC. A DTC only appears on the I/M System Status display when the DTC becomes a MIL illuminating DTC. This occurs on the second failure of a type "B" DTC. A first failure of a type "B" DTC will not allow the I/M System Status to update to YES. See DIAGNOSTIC AIDS .

  4. 4

    This step helps identify any unique or unusual criteria required to run the diagnostic test if the universal set procedure does not. This information is located in Conditions for Running DTC.

  5. 5

    The I/M System Status only reports on whether or not a diagnostic has run, not the outcome of the test. If any Emission Related DTC sets after the tests are complete, the DTC will require diagnosis.

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