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Home >> Isuzu >> 2003 >> Ascender 4.2 S, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 4.2L >> Drive Cycles >> Inspection/Maintenance Catalyst System Set Procedure >> Test Description

Test Description

The numbers below refer to the step numbers 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 AIR Tests will begin shortly after the engine goes into Closed Loop fuel control. Some vehicles perform a Passive Test during Open Loop operation shortly after a cold start up.
  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. See CONDITIONS FOR RUNNING .
  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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