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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 834 (Engine Controls (Troubleshooting & Diagnosis) -- 5.7L) >> Troubleshooting >> Inspection/Maintenance (I/M) Heated Oxygen Sensor (HO2S) Heater System Set Procedure >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

The HO2S Heater Tests will normally run within the 2 minutes allotted in the procedure. If there is an indeterminate condition, the test may take up to 8 minutes on some vehicles before a decision of pass or fail is made. If the test does not update to YES, it may have failed or aborted due to the loss of enabling conditions. Extremely high ambient temperatures may prevent the HO2S Heater Test from initiating.

If there is an impending failure, the system may require more time to run the diagnostic than was allotted in the set procedure. If the test does not run after numerous attempts and no DTC is set, review the appropriate scan tool data list and the service information for an indication of why the test does not complete. Some tests may abort due to changes in the conditions while the test is running. For example, changes in engine load such as a cooling fan or A/C compressor clutch turning ON may cause the test to abort.

Inspection/Maintenance (I/M) Heated Oxygen Sensor (HO2S) Heater System Set Procedure

Step Action Value(s) Yes No
1 Did you perform the Inspection/Maintenance (I/M) System Check? - Go to Step 2  Go to Inspection/Maintenance (I/M) System Check 
2
    IMPORTANT: Whenever the ignition is turned ON, ignition positive voltage is supplied to the HO2S heaters. After verifying the enable criteria, turn OFF the ignition for approximately 5 minutes to allow the sensors to cool before continuing with the test.
  1. Preprogram the scan tool with the vehicle information before the ignition is turned ON.
  2. Ensure the vehicle is within the Conditions for Running as specified in the supporting text.
  3. Set the vehicle parking brake.
  4. Verify the transmission is in Park for automatic transmissions and Neutral for manual transmissions.
  5. Turn OFF all of the accessories, e.g., A/C, blower fan, etc.
  6. Start the engine and allow it to idle for the specified time or until the I/M System Status indicator updates to YES.
Did the HO2S Heater System Status update to YES?		 2 minutes Go to Step 5  Go to Step 3 
3 Observe the DTC information with a scan tool.
Does the scan tool indicate any failed DTCs?		 - Go to Diagnostic Trouble Code (DTC) List Go to Step 4 
4
  1. Refer to the Inspection/Maintenance (I/M) System DTC Table  to determine which DTCs are required to run in order to complete this test.
  2. Observe the Not Ran Since Code Cleared display with a scan tool.
  3. Determine which of the DTCs required for a YES status has not run.
  4. Enter the DTC number in the Specific DTC menu of the scan tool.
  5. Operate the vehicle within the Conditions for Running the DTC, located in the supporting text for the diagnostic table of the DTC.
  6. Repeat the procedure until the scan tool indicates the diagnostic test has run.
  7. Repeat steps 4-6 for any additional required DTCs that have not run.
  8. Observe the I/M System Status display with a scan tool.
Did the HO2S Heater System Status update to YES?		 - Go to Step 5  Go to Diagnostic Aids
5 Observe the Emission Related DTC portion of the I/M System Status display with a scan tool.
Does the scan tool indicate any Emission Related DTCs set?		 - Go to Diagnostic Trouble Code (DTC) List System OK
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