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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1350 (Engine Control System (Troubleshooting & Diagnosis) -- 1.8L (LNK)) >> Troubleshooting >> Inspection/Maintenance (I/M) Heated Oxygen Sensor/Oxygen Sensor (HO2S/O2S) System Set Procedure >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 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 in the diagnostic table.

  1. 1:  Make sure 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 oxygen sensor tests begin during the idle period immediately following the cruise period.
  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. 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 what the outcome of the test was. If any Emission Related DTC sets after the tests are complete, the DTC will require diagnosis.
Inspection/Maintenance (I/M) Heated Oxygen Sensor/Oxygen Sensor (HO2S/O2S) System Set Procedure

Step Action Yes No
1  Did you perform the Inspection/Maintenance (I/M) System Check? Go to Step 2  Go to Diagnostic System Check - Engine Controls
2 
  1. Ensure the vehicle is within the Conditions for Running specified in the supporting text.
  2. Turn OFF all of the accessories, e.g., A/C, blower fan, etc.
  3. Start and idle the engine.
    4. CAUTION: Refer to Road Test Caution in Cautions and Notices.
    IMPORTANT: In order for this test to run, the vehicle must operate in the following conditions:
  4. Accelerate the engine to 48-80 km/h (30-50 mph) and cruise for 3 minutes after the engine reaches operating temperature.
  5. Deceleration to 0 km/h (0 mph).
  6. Idle the engine for 2 minutes While the following criteria is maintained:
    • Service brake is depressed
    • Automatic transmission in drive
    • Manual transmission in neutral with the clutch pedal depressed
  7. Accelerate at part throttle to 48-80 km/h (30-50 mph) with this speed maintained for 30 seconds.
  8. With a scan tool, review the I/M System Status display.
Did the HO2S/O2S System Status update to YES?		 Go to Step 5  Go to Step 3 
3  With a scan tool, observe the DTC Information.
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. Operate the vehicle within the Conditions for Running the DTC, located in the supporting text for the diagnostic table of the DTC.
  3. Repeat the procedure until the scan tool indicates the diagnostic test has run.
  4. With a scan tool, observe the I/M System Status display.
Did the HO2S/O2S System Status update to YES?		 Go to Step 5  Go to Diagnostic Aids
5  With a scan tool, observe the Emission Related DTC portion of the I/M System Status display.
Does the scan tool indicate any Emission Related DTCs set?		 Go to Diagnostic Trouble Code (DTC) List System OK
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