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Home >> Cadillac >> 2011 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 28 (Engine Control System - Self-Diagnostics) >> Drive Cycles >> Inspection/Maintenance (I/M) Heated Oxygen Sensor (Ho2S) Heater System Set Procedure >> Test Description
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Test Description

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 1  - Ensure 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  - Preprogramming the scan tool will reduce the amount of time the oxygen sensor heaters operate while verifying the enable criteria. HO2S heater tests may not complete when initiated from a cold start and may require running under a load to complete the tests.
  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 it 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 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. This information is located in the service information under conditions for running the DTC. 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 tests are complete, the DTC will require diagnosis.
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