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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 413 (Engine Controls - Self Diagnostics - 8.1L) >> Drive Cycles >> Inspection/Maintenance Exhaust Gas RECIRCULATION (EGR) System Set Procedure >> Test Description

Test Description

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

  1. 1

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

  2. 2

    The EGR Active Tests are run during a gradual deceleration with a closed throttle. The vehicle speed is required in order to maintain a high, steady MAP signal.

  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. Refer to DIAGNOSTIC AIDS .

  4. 4

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