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Home >> Chevrolet >> 2003 >> Impala Base, 3.4 E >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 3.4L >> Drive Cycles >> Inspection/Maintenance Heated Oxygen Sensor Heater System Set Procedure >> Test Description

Test Description

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

  1. 1  - 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  - Preprogramming the scan tool will reduce the amount of time the oxygen sensor heaters operate while verifying the enable criteria.
  3. 3  - This step is to identify 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 is to help identify any unique or unusual criteria required to run the diagnostic test in the event the universal set procedure does not.
  5. 5  - The I/M System Status only reports on whether or not a diagnostic has run, not what the outcome of the test was. If any emission related DTC sets after the tests are complete, the DTC will require diagnosis.
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